clap/CHANGELOG.md

# Change Log
All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](http://keepachangelog.com/)
and this project adheres to [Semantic Versioning](http://semver.org/).

## 5.0.0 - 2022-11-24

### Breaking Changes

- Made `ArgPredicate` `non_exhaustive`
- *(help)* Change default `Command::term_width` to "source format"
- *(help)* Change default `Command::max_term_width` to 100
- *(derive)* `Vec<Vec<T>>` types are now assuming to capture occurrences

### Features

- *(derive)* Group values by their occurrence with `Vec<Vec<T>>`

<!-- next-header -->
## [Unreleased] - ReleaseDate

## [4.5.17] - 2024-09-04

### Fixes

- *(help)* Style required argument groups
- *(derive)* Improve error messages when unsupported fields are used

## [4.5.16] - 2024-08-15

### Fixes

- *(derive)* Improve error messages when `derive` feature is missing

## [4.5.15] - 2024-08-10

### Compatiblity

- *(unstable-ext)* `Arg::remove` changed return types

### Fixes

- *(unstable-ext)* Make `Arg::remove` return the removed item

## [4.5.14] - 2024-08-08

### Features

- *(unstable-ext)* Added `Arg::add` for attaching arbitrary state, like completion hints, to `Arg` without `Arg` knowing about it

## [4.5.13] - 2024-07-31

### Fixes

- *(derive)* Improve error message when `#[flatten]`ing an optional `#[group(skip)]`
- *(help)* Properly wrap long subcommand descriptions in help

## [4.5.12] - 2024-07-31

## [4.5.11] - 2024-07-25

## [4.5.10] - 2024-07-23

## [4.5.9] - 2024-07-09

### Fixes

- *(error)* When defining a custom help flag, be sure to suggest it like we do the built-in one

## [4.5.8] - 2024-06-28

### Fixes

- Reduce extra flushes

## [4.5.7] - 2024-06-10

### Fixes

- Clean up error message when too few arguments for `num_args`

## [4.5.6] - 2024-06-06

## [4.5.5] - 2024-06-06

### Fixes

- Allow `exclusive` to override `required_unless_present`, `required_unless_present_any`, `required_unless_present_all`

## [4.5.4] - 2024-03-25

### Fixes

- *(derive)* Allow non-literal `#[arg(id)]` attributes again

## [4.5.3] - 2024-03-15

### Internal

- *(derive)* Update `heck`

## [4.5.2] - 2024-03-06

### Fixes

- *(macros)* Silence a warning

## [4.5.1] - 2024-02-16

### Fixes

- *(error)* Include suggestion to add `--` even if there is a "did you mean" so long as `last` or `trailing_var_arg` is used

## [4.5.0] - 2024-02-08

### Compatibility

- Update MSRV to 1.74

## [4.4.18] - 2024-01-16

### Fixes

- *(error)* When lacking `usage` feature, ensure the list of required arguments is unique

## [4.4.17] - 2024-01-15

### Fixes

- Fix `panic!` when mixing `args_conflicts_with_subcommands` with `ArgGroup` (which is implicit with `derive`) introduced in 4.4.15

## [4.4.16] - 2024-01-12

### Fixes

- Ensure invalid escape sequences in user-defined strings are correctly stripped when terminal doesn't support color

## [4.4.15] - 2024-01-11

### Fixes

- Improve error for `args_conflicts_with_subcommands`
- Ensure we error for `args_conflicts_with_subcommands` when using subcommand short and long flags

## [4.4.14] - 2024-01-08

### Documentation

- Fix `find` cookbook entry to allow repeats of flags/options

### Features

- Allow `num_args(0)` on options which allows making them emulate being a flag for position-tracking flags

## [4.4.13] - 2024-01-04

### Documentation

- Fix link to structopt migration guide

## [4.4.12] - 2023-12-28

### Performance

- Only ask `TypedValueParser` for possible values if needed

## [4.4.11] - 2023-12-04

### Features

- Add `Command::mut_group`

## [4.4.10] - 2023-11-28

### Documentation

- Link out to changelog
- Cross link derive's attribute reference to derive tutorial

## [4.4.9] - 2023-11-27

### Fixes

- *(help)* Show correct `Command::about` under flattened headings
- *(help)* Respect `hide` when flattening subcommands

## [4.4.8] - 2023-11-10

### Features

- Add `Command::flatten_help` to allow `git stash -h` like help for subcommands

## [4.4.7] - 2023-10-24

### Performance

- Reduced code size

## [4.4.6] - 2023-09-28

### Internal

- Upgrade `anstream`

## [4.4.5] - 2023-09-25

### Fixes

- *(parser)* When inferring subcommand `name` or `long_flag`, allow ambiguous-looking matches that unambiguously map back to the same command
- *(parser)* When inferring subcommand `long_flag`, don't panic
- *(assert)* Clarify what action is causing a positional that doesn't set values which is especially useful for derive users

## [4.4.4] - 2023-09-18

### Internal

- Update `terminal_size` to 0.3

## [4.4.3] - 2023-09-12

### Documentation

- *(derive)* Clarify use of attributes within the tutorial
- Split sections in the builder and derive tutorials into separate modules

## [4.4.2] - 2023-08-31

### Performance

- Improve build times by removing `once_cell` dependency

## [4.4.1] - 2023-08-28

### Features

- Stabilize `Command::styles`

## [4.4.0] - 2023-08-24

### compatibility

- update msrv to 1.70.0

## [4.3.24] - 2023-08-23

### Fixes

- Ensure column padding is preserved in `--help` with custom templates

## [4.3.23] - 2023-08-18

### Fixes

- Fixed `UnknownArgumentValueParser` to not error on flag's absence

## [4.3.22] - 2023-08-17

### Features

- Add `UnknownArgumentValueParser` for injecting errors for improving the experience with errors

## [4.3.21] - 2023-08-08

### Features

- Expose `TryMapValueParser` so the type can be named

## [4.3.20] - 2023-08-08

### Features

- `Command::mut_args` for modifying all arguments en masse

## [4.3.19] - 2023-07-21

### Fixes

- *(parse)* Respect `value_terminator` even in the presence of later multiple-value positional arguments

## [4.3.18] - 2023-07-21

### Fixes

- *(parse)* Suggest `--` in fewer places where it won't work

## [4.3.17] - 2023-07-19

### Fixes

- *(help)* Address a regression in wrapping `PossibleValue` descriptions in `--help`

## [4.3.16] - 2023-07-18

### Fixes

- Don't assert when stateful value parsers fail on defaults (e.g. checking if a path exists)

## [4.3.15] - 2023-07-18

### Features

- *(unstable-styles)* Re-export `anstyle`

### Documentation

- *(unstable-styles)* Provide more examples

## [4.3.14] - 2023-07-17

### Features

- `ArgAction::HelpShort` and `ArgAction::HelpLong` for explicitly specifying which style of help to display

### Fixes

- Skip `[OPTIONS]` in usage if a help or version `ArgAction` is used

## [4.3.13] - 2023-07-17

## [4.3.12] - 2023-07-14

### Fixes

- *(derive)* Don't error on enum variant field attributes

## [4.3.11] - 2023-07-05

### Features

- *(derive)* Support fields wrapped in `num::Wrapping`, `Box`, or `Arc`
- *(derive)* Support `Box<str>`, `Box<OsStr>`, and `Box<Path>`

## [4.3.10] - 2023-06-30

### Performance

- Drop a dependency, reducing binary size by 1.3 KiB

## [4.3.9] - 2023-06-28

### Fixes

- `Command::ignore_errors` no longer masks help/version

## [4.3.8] - 2023-06-23

### Fixes

- Error on ambiguity with `infer_long_arg`, rather than arbitrarily picking one, matching the documentation and subcommand's behavior

## [4.3.7] - 2023-06-23

### Documentation

- Further clarify magic behavior in derive tutorial
- Further clarify derive API's relationship to builder within the tutorial

## [4.3.6] - 2023-06-23

### Documentation

- Suggest `clio`

## [4.3.5] - 2023-06-20

- `ColorChoice::possible_values` is added to simplify things for builder users

### Fixes

- `ColorChoice::to_possible_value` no longer includes descriptions, encouraging shorter help where possible

## [4.3.4] - 2023-06-14

### Features

- Add `Error::exit_code`

## [4.3.3] - 2023-06-09

### Features

- `Command::defer` for delayed initialization of subcommands to reduce startup times of large applications like deno

## [4.3.2] - 2023-06-05

### Fixes

- *(derive)* Don't produce `unused_equalifications` warnings when someone brings a clap type into scope

## [4.3.1] - 2023-06-02

### Performance

- *(derive)* Reduce the amount of generated code

## [4.3.0] - 2023-05-19

### Fixes

- *(assert)* Allow multiple, value-terminated, positional arguments
- *(assert)* Clear up language on `last` assertion
- *(parser)* Correctly assign values to arguments when using multiple, value-termianted, positional arguments
- *(parser)* Ensure `value_terminator` has higher precedence than `allow_hyphen_values`
- *(help)* Only use next-line-help on subcommand list when explicitly specified, not just with `--help`
- *(help)* Correctly align possible values list
- *(help)* Don't waste code, vertical space in moving possible value descriptions to next line

## [4.2.7] - 2023-05-02

### Fixes

- Correctly track remaining length for iterators provided by `ArgMatches`

## [4.2.6] - 2023-05-02

### Features

- `impl Eq<std::any::TypeId> for clap_builder::util::AnyValueId`

## [4.2.5] - 2023-04-27

### Fixes

- Improve panic when a group requires a non-existent ID

## [4.2.4] - 2023-04-19

### Documentation

- Corrected docs for `Command::style`

## [4.2.3] - 2023-04-18

### Features

- `Command::styles` for theming help/errors (behind `unstable-styles`)

## [4.2.2] - 2023-04-13

### Internal

- Update dependencies

## [4.2.1] - 2023-03-28

### Fixes

- Don't highlight uninteresting parts of the error message

## [4.2.0] - 2023-03-28

### Compatibility

- Removed the languishing `unstable-replace` feature (open to discussion at [#2836](https://github.com/clap-rs/clap/issues/2836))
- Removed the stablized `unstable-grouped` feature

### Features

- Allow any `StyledStr` to accept text styled with ANSI escape codes
- Respect `CLICOLOR`, `CLICOLOR_FORCE`

### Fixes

- Lighten the tone for "unexpected argument" errors (open to discussion at [#4638](https://github.com/clap-rs/clap/issues/4638))

## [4.1.14] - 2023-03-28

### Features

- *(derive)* `#[group]` raw attribute support

### Performance

- *(derive)* `clap_builder` was pulled out of `clap` so it could build in parallel to `clap_derive`
- `os_str_bytes` dependency was removed for faster builds and smaller binaries

## [4.1.13] - 2023-03-18

### Performance

- Reduce repeated alloc calls when building a `Command`
- Reduce duplicate dependencies for faster builds

## [4.1.12] - 2023-03-18

### Internal

- *(derive)* Update to `syn` v2

### Performance

- *(derive)* Faster build times by dropping `proc-macro-error` dependency

## [4.1.11] - 2023-03-17

### Internal

- Update `bitflags`

## [4.1.10] - 2023-03-17

### Fixes

- *(help)* On Windows, avoid underlined text artifacts

## [4.1.9] - 2023-03-16

### Fixes

- *(assert)* Improve the assert when using the wrong action with `get_count` / `get_flag`

## [4.1.8] - 2023-02-27

### Fixes

- *(derive)* Don't `deny` lints on the users behalf

## [4.1.7] - 2023-02-27

### Fixes

- *(derive)* Hide some nightly clippy warnings

## [4.1.6] - 2023-02-15

### Fixes

- *(help)* Don't show long help for `--help` just because hidden possible values include a description

## [4.1.5] - 2023-02-15

### Fixes

- *(help)* Don't show long help for `--help` just because a hidden arg has a possible value with a description

## [4.1.4] - 2023-01-24

### Fixes

- *(help)* Respect `disable_colored_help` when using `arg_required_else_help`

### Performance

- Speed up compiling `arg!` macro

## [4.1.3] - 2023-01-23

### Fixes

- *(error)* Improve suggested flag/value/subcommand when two share a long preifx
- *(error)* When suggesting one of several subcommands, use the plural `subcommands`, rather than `subcommand`

## [4.1.2] - 2023-01-23

### Fixes

- In documentation, refer to `get_flag`, rather than `get_one::<bool>`

## [4.1.1] - 2023-01-14

### Fixes

- *(error)* Small softening attempt for "unexpected argument" error

## [4.1.0] - 2023-01-13

### Compatibility

MSRV changed to 1.64.0

For apps with custom `--help` and `--version` flags:
- Descriptions for `--help` and `--version` changed

When apps have errors imitating clap's error style:
- Error message style was changed, including
  - Moving away from "did you mean" to tips
  - Leading letter is lower case
  - "For more" added some punctuation

### Features

- `ArgMatches::get_occurrences` support for argument values to be grouped by their occurrence

### Fixes

- *(derive)* Allow `upgrade_from` when arguments / subcommands are explicitly marked as required
- *(help)* Try be more clearer and succinct with `--help` and `--version` (also helps with overflow)
- *(error)* Try to be more clearer and succinct with error messages
- *(error)* Officially adopt [an error style guide](https://rustc-dev-guide.rust-lang.org/diagnostics.html#suggestion-style-guide)

## [4.0.32] - 2022-12-22

### Fixes

- *(parser)* When overriding `required(true)`, consider args that conflict with its group

## [4.0.31] - 2022-12-22

### Performance

- Speed up parsing when a lot of different flags are present (100 unique flags)

## [4.0.30] - 2022-12-21

### Fixes

- *(error)* Improve error for `args_conflicts_with_subcommand`

## [4.0.29] - 2022-11-29

## [4.0.28] - 2022-11-29

### Fixes

- Fix wasm support which was broken in 4.0.27

## [4.0.27] - 2022-11-24

### Features

- Have `Arg::value_parser` accept `Vec<impl Into<PossibleValue>>`
- Implement `Display` and `FromStr` for `ColorChoice`

### Fixes

- Remove soundness issue by switching from `atty` to `is-terminal`

## [4.0.26] - 2022-11-16

### Fixes

- *(error)* Fix typos in `ContextKind::as_str`

## [4.0.25] - 2022-11-15

### Features

- *(error)* Report available subcommands when required subcommand is missing

## [4.0.24] - 2022-11-14

### Fixes

- Avoid panic when printing an argument that isn't built

## [4.0.23] - 2022-11-11

### Fixes

- Don't panic on reporting invalid-long errors when followed by invalid UTF8
- *(help)* Clarified argument to `help` subcommand

## [4.0.22] - 2022-11-07

### Fixes

- *(help)* Don't overflow into next-line-help early due to stale (pre-v4) padding calculations

## [4.0.21] - 2022-11-07

### Features

- *(derive)* `long_about` and `long_help` attributes, without a value, force using doc comment (before it wouldn't be set if there wasn't anything different than the short help)

## [4.0.20] - 2022-11-07

### Fixes

- *(derive)*  Allow defaulted value parser for '()' fields

## [4.0.19] - 2022-11-04

### Features

- `ColorChoice` now implements `ValueEnum`

## [4.0.18] - 2022-10-20

### Fixes

- *(derive)* Allow `#[command(skip)]` to also work with enum variants with a value

## [4.0.17] - 2022-10-18

### Fixes

- Allow using `Arg::last(true)` with `Arg::value_hint(ValueHint::CommandWithArguments)`

## [4.0.16] - 2022-10-18

### Fixes

- `Arg::exclusive(true)` should not be exclusive with the argument's own `ArgGroup`

## [4.0.15] - 2022-10-13

### Fixes

- *(error)* Don't suggest `--` when it doesn't help
- *(error)* Be more consistent in quoting, punctuation, and indentation in errors

## [4.0.14] - 2022-10-12

### Fixes

- Only put `ArgGroup` in `ArgMatches` when explicitly specified, fixing derives handling of option-flattened fields (#4375)

## [4.0.13] - 2022-10-11

### Features

- *(derive)* Allow `()` for fields to mean "don't read" (#4371)

## [4.0.12] - 2022-10-10

### Features

- Added `TypedValueParser::try_map` for when adapting an existing `TypedValueParser` can fail
- *(error)* Create errors like clap with `Error::new`, `Error::with_cmd`, and `Error::insert`

## [4.0.11] - 2022-10-09

### Fixes

- *(help)* Fix wrapping calculations with ANSI escape codes

## [4.0.10] - 2022-10-05

### Features

- *(derive)* Support `#[arg(flatten)]` on `Option` types (#4211, #4350)

## [4.0.9] - 2022-10-03

### Fixes

- *(derive)* Process doc comments for `#[command(subcommand)]` like in clap v3

## [4.0.8] - 2022-10-01

### Fixes

- *(derive)* Remove a low-value assert preventing defaulting `Help` and `Version` actions

## [4.0.7] - 2022-09-30

### Features

- *(derive)* Populate implicit ArgGroup (#3165)

### Fixes

- *(derive)* Support `#[group(skip)]` on `Parser` derive
- *(derive)* Tell users about implicit arg groups when running into group name conflicts
- *(error)* Don't report unrelated groups in conflict or requires errors

## [4.0.6] - 2022-09-30

### Features

- *(derive)* Support `#[group(skip)]` (#4279, #4301)

## [4.0.5] - 2022-09-30

## [4.0.4] - 2022-09-29

### Fixes

- *(error)* Specialize the self-conflict error to look like clap v3

## [4.0.3] - 2022-09-29

### Fixes

- *(error)* Quote literals consistently
- *(error)* Stylize escape (`--`) suggestions
- *(error)* Format help flag as a literal

## [4.0.2] - 2022-09-28

### Fixes

- *(parser)* `SetFalse` should conflict with itself like `SetTrue` and `Set`
- *(parser)* Allow one-off overrides

## [4.0.1] - 2022-09-28

### Fixes

- *(derive)* Ensure `#[clap(...)]` attribute still works

## [4.0.0] - 2022-09-28

### Highlights

**`Arg::num_args(range)`**

Clap has had several ways for controlling how many values will be captured without always being clear on how they interacted, including
- `Arg::multiple_values(true)`
- `Arg::number_of_values(4)`
- `Arg::min_values(2)`
- `Arg::max_values(20)`
- `Arg::takes_value(true)`

These have now all been collapsed into `Arg::num_args` which accepts both
single values and ranges of values.  `num_args` controls how many raw arguments
on the command line will be captured as values per occurrence and independent
of value delimiters.

See [Issue 2688](https://github.com/clap-rs/clap/issues/2688) for more background.

**Polishing Help**

Clap strives to give a polished CLI experience out of the box with little
ceremony.  With some feedback that has accumulated over time, we took this
release as an opportunity to re-evaluate our `--help` output to make sure it is
meeting that goal.

In doing this evaluation, we wanted to keep in mind:
- Whether other CLIs had ideas that make sense to apply
- Providing an experience that fits within the rest of applications and works across all shells

Before:
```
git
A fictional versioning CLI

USAGE:
    git <SUBCOMMAND>

OPTIONS:
    -h, --help    Print help information

SUBCOMMANDS:
    add      adds things
    clone    Clones repos
    help     Print this message or the help of the given subcommand(s)
    push     pushes things
    stash
```

After:
```
A fictional versioning CLI

Usage: git <COMMAND>

Commands:
  clone  Clones repos
  push   pushes things
  add    adds things
  stash
  help   Print this message or the help of the given subcommand(s)

Options:
  -h, --help  Print help information
```
- name/version header was removed because we couldn't justify the space it occupied when
  - Usage already includes the name
  - `--version` is available for showing the same thing (if the program has a version set)
- Usage was dropped to one line to save space
- Focus is put on the subcommands
- Headings are now Title case
- The more general term "command" is used rather than being explicit about being "subcommands"
- The output is more dense with the expectation that it won't affect legibility but will allow more content
- We've moved to a more neutral palette for highlighting elements (not highlighted above)

In talking to users, we found some that liked clap's `man`-like experience.
When deviating from this, we are making the assumption that those are more
power users and that the majority of users wouldn't look as favorably on being
consistent with `man`.

See [Issue 4132](https://github.com/clap-rs/clap/issues/4132) for more background.

**More Dynamicism**

Clap's API has focused on `&str` for performance but this can make
dealing with owned data difficult, like `#[arg(default_value_t)]` generating a
String from the default value.

Additionally, to avoid `ArgMatches` from borrowing (and for some features we
decided to forgo), clap took the `&str` argument IDs and hashed them.  This
prevented us from providing a usable API for iterating over existing arguments.

Now clap has switched to a string newtype that gives us the flexibility to
decide whether to use `&'static str`, `Cow<'static, str>` for fast dynamic behavior, or
`Box<str>` for dynamic behavior with small binary size.

As an extension of that work, you can now call `ArgMatches::ids` to iterate
over the arguments and groups that were found when parsing.  The newtype `Id`
was used to prevent some classes of bugs and to make it easier to understand
when opaque Ids are used vs user-visible strings.

**Clearing Out Deprecations**

Instead of doing all development on clap 4.0.0, we implemented a lot of new features during clap 3's development, deprecating the old API while introducing the new API, including:
- Replacing the implicit behavior for args when parsing them with `ArgAction`
- Replacing various one-off forms of value validation with the `ValueParser` API
  - Allowing derives to automatically do the right thing for `PathBuf` (allowing invalid UTF-8)
- Replacing `AppSettings` and `ArgSettings` enums with getters/setters
- Clarifying terms and making them more consistent

### Migrating

Steps:

0. [Upgrade to v3](https://github.com/clap-rs/clap/blob/v3-master/CHANGELOG.md#migrating) if you haven't already
1. Add CLI tests (including example below), `-h` and `--help` output at a minimum (recommendation: [trycmd](https://docs.rs/trycmd/) for snapshot testing)
2. *If using Builder API*: Explicitly set the `arg.action(ArgAction::...)` on each argument (`StoreValue` for options and `IncOccurrences` for flags)
3. Run `cargo check --features clap/deprecated` and resolve all deprecation warnings
4. Upgrade to v4
5. Update feature flags
  - *If `default-features = false`*, run `cargo add clap -F help,usage,error-context`
  -  Run `cargo add clap -F wrap_help` unless you want to hard code line wraps
6. Resolve compiler errors
7. Resolve behavior changes (see "subtle changes" under BREAKING CHANGES)
8. *At your leisure:* resolve new deprecation notices

Example test (derive):
```rust
#[derive(clap::Parser)]
struct Cli {
    ...
}

#[test]
fn verify_cli() {
    use clap::CommandFactory;
    Cli::command().debug_assert()
}
```

Example test (builder):
```rust
fn cli() -> clap::Command {
    ...
}

#[test]
fn verify_cli() {
    cli().debug_assert();
}
```

Note: the idiomatic / recommended way of specifying different types of args in the Builder API has changed:

Before
```rust
.arg(Arg::new("flag").long("flag"))  # --flag
.arg(Arg::new("option").long("option").takes_value(true))  # --option <option>
```
After:
```rust
.arg(Arg::new("flag").long("flag").action(ArgAction::SetTrue))  # --flag
.arg(Arg::new("option").long("option"))  # --option <option>
```
In particular, `num_args` (the replacement for `takes_value`) will default appropriately
from the `ArgAction` and generally only needs to be set explicitly for the
other `num_args` use cases.

### Breaking Changes

Subtle changes (i.e. compiler won't catch):

- `arg!` now sets one of (#3795):
  - `ArgAction::SetTrue`, requiring `ArgMatches::get_flag` instead of `ArgMatches::is_present`
  - `ArgAction::Count`, requiring `ArgMatches::get_count` instead of `ArgMatches::occurrences_of`
  - `ArgAction::Set`, requiring `ArgMatches::get_one` instead of `ArgMatches::value_of`
  - `ArgAction::Append`, requiring `ArgMatches::get_many` instead of `ArgMatches::values_of`
- `ArgAction::Set`, `ArgAction::SetTrue`, and `Arg::Action::SetFalse` now
  conflict by default to be like `ArgAction::StoreValue` and
  `ArgAction::IncOccurrences`, requiring `cmd.args_override_self(true)` to override instead (#4261)
- By default, an `Arg`s default action is `ArgAction::Set`, rather than `ArgAction::IncOccurrence` to reduce confusing magic through consistency (#2687, #4032, see also #3977)
- `mut_arg` can no longer be used to customize help and version arguments, instead disable them (`Command::disable_help_flag`, `Command::disable_version_flag`) and provide your own (#4056)
- Removed lifetimes from `Command`, `Arg`, `ArgGroup`, and `PossibleValue`, assuming `'static`.  `string` feature flag will enable support for `String`s (#1041, #2150, #4223)
- `arg!(--flag <value>)` is now optional, instead of required.  Add `.required(true)` at the end to restore the original behavior (#4206)
- Added default feature flags, `help`, `usage` and `error-context`, requiring adding them back in if `default-features = false` (#4236)
- *(parser)* Always fill in `""` argument for external subcommands to make it easier to distinguish them from built-in commands (#3263)
- *(parser)* Short flags now have higher precedence than hyphen values with `Arg::allow_hyphen_values`, to be consistent with `Command::allow_hyphen_values` (#4187)
- *(parser)* `Arg::value_terminator` must be its own argument on the CLI rather than being in a delimited list (#4025)
- *(help)* Line wrapping of help is now behind the existing `wrap_help` feature flag, either enable it or hard code your wraps (#4258)
- *(help)* Make `DeriveDisplayOrder` the default and removed the setting.  To sort help, set `next_display_order(None)` (#2808)
- *(help)* Subcommand display order respects `Command::next_display_order` instead of `DeriveDisplayOrder` and using its own initial display order value (#2808)
- *(help)* Subcommands are now listed before arguments.  To get the old behavior, see `Command::help_template` (#4132)
- *(help)* Help headings are now title cased, making any user-provided help headings inconsistent.  To get the old behavior, see `Command::help_template`, `Arg::help_heading`, and `Command::subcommand_help_heading` (#4132)
- *(help)* "Command" is used as the section heading for subcommands and `COMMAND` for the value name.  To get the old behavior, see  `Command::subcommand_help_heading` and `Arg::subcommand_value_name` (#4132, #4155)
- *(help)* Whitespace in help output is now trimmed to ensure consistency regardless of how well a template matches the users needs. (#4132, #4156)
- *(help)* name/version/author are removed by default from help output.  To get the old behavior, see `Command::help_template`. (#4132, #4160)
- *(help)* Indentation for second-line usage changed. (#4132, #4188)
- *(env)* Parse `--help` and `--version` like any `ArgAction::SetTrue` flag (#3776)
- *(derive)* Leave `Arg::id` as `verbatim` casing, requiring updating of string references to other args like in `conflicts_with` or `requires` (#3282)
- *(derive)* Doc comments for `ValueEnum` variants will now show up in `--help` (#3312)
- *(derive)* When deriving `Args`, and `ArgGroup` is created using the type's name, reserving it for future use (#2621, #4209)
- *(derive)* `next_help_heading` can now leak out of a `#[clap(flatten)]`, like all other command settings (#4222)

Easier to catch changes:

- Looking up a group in `ArgMatches` now returns the arg `Id`s, rather than the values to reduce overhead and offer more flexibility. (#4072)
- Changed `Arg::number_of_values` (average-across-occurrences) to `Arg::num_args` (per-occurrence) (raw CLI args, not parsed values) (#2688, #4023)
  - `num_args(0)` no longer implies `takes_value(true).multiple_values(true)` (#4023)
  - `num_args(1)` no longer implies `multiple_values(true)` (#4023)
  - Does not check default or env values, only what the user explicitly passes in (#4025)
  - No longer terminates on delimited values (#4025)
- Replace `Arg::min_values` (across all occurrences) with `Arg::num_args(N..)` (per occurrence) to reduce confusion over different value count APIs (#4023)
- Replace `Arg::max_values` (across all occurrences) with `Arg::num_args(1..=M)` (per occurrence) to reduce confusion over different value count APIs  (#4023)
- Replace `Arg::multiple_values(true)` with `Arg::num_args(1..)` and `Arg::multiple_values(false)` with `Arg::num_args(0)` to reduce confusion over different value count APIs  (#4023)
- Replace `Arg::takes_value(true)` with `Arg::num_args(1)` and `Arg::takes_value(false)` with `Arg::num_args(0)` to reduce confusion over different value count APIs
- Remove `Arg::require_value_delimiter`, either users could use `Arg::value_delimiter` or implement a custom parser with `TypedValueParser` as it was mostly to make `multiple_values(true)` act like `multiple_values(false)` and isn't needed anymore (#4026)
- `Arg::new("help")` and `Arg::new("version")` no longer implicitly disable the
  built-in flags and be copied to all subcommands, instead disable
  the built-in flags (`Command::disable_help_flag`,
  `Command::disable_version_flag`) and mark the custom flags as `global(true)`. (#4056)
- `Arg::short('h')` no longer implicitly disables the short flag for help,
  instead disable
  the built-in flags (`Command::disable_help_flag`,
  `Command::disable_version_flag`) provide your own `Arg::new("help").long("help").action(ArgAction::Help).global(true)`. (#4056)
- `ArgAction::SetTrue` and `ArgAction::SetFalse` now prioritize `Arg::default_missing_value` over their standard behavior (#4000)
- Changed `Arg::requires_ifs` and `Arg::default_value*_ifs*` to taking an `ArgPredicate`, removing ambiguity with `None` when accepting owned and borrowed types (#4084)
- Removed `PartialEq` and `Eq` from `Command` so we could change external subcommands to use a `ValueParser` (#3990)
- Various `Arg`, `Command`, and `ArgGroup` calls were switched from accepting `&[]` to `[]` via `IntoIterator` to be more flexible (#4072)
- `Arg::short_aliases` and other builder functions that took `&[]` need the `&` dropped (#4081)
- `ErrorKind` and `Result` moved into the `error` module
- `ErrorKind::EmptyValue` replaced with `ErrorKind::InvalidValue` to remove an unnecessary special case (#3676, #3968)
- `ErrorKind::UnrecognizedSubcommand` replaced with `ErrorKind::InvalidSubcommand` to remove an unnecessary special case (#3676)
- Changed the default type of `allow_external_subcommands` from `String` to `OsString` as that is less likely to cause bugs in user applications (#3990)
- *(help)* `Command::render_usage` now returns a `StyledStr` (#4248)
- *(derive)* Changed the default for arguments from `parse` to `value_parser`, removing `parse` support (#3827, #3981)
  - `#[clap(value_parser)]` and `#[clap(action)]` are now redundant
- *(derive)* `subcommand_required(true).arg_required_else_help(true)` is set instead of `SubcommandRequiredElseHelp` to give more meaningful errors when subcommands are missing and to reduce redundancy (#3280)
- *(derive)* Remove `arg_enum` attribute in favor of `value_enum` to match the new name (we didn't have support in v3 to mark it deprecated) (#4127)
- *(parser)* Assert when the CLI looksup an unknown args when external subcommand support is enabled to help catch bugs (#3703)
- *(assert)* Sometimes `Arg::default_missing_value` didn't require `num_args(0..=N)`, now it does (#4023)
- *(assert)* Leading dashes in `Arg::long` are no longer allowed (#3691)
- *(assert)* Disallow more `value_names` than `num_args` (#2695)
- *(assert)* Always enforce that version is specified when the `ArgAction::Version` is used
- *(assert)* Add missing `#[track_caller]`s to make it easier to debug asserts
- *(assert)* Ensure `overrides_with` IDs are valid
- *(assert)* Ensure no self-`overrides_with` now that Actions replace it
- *(assert)* Ensure subcommand names are not duplicated
- *(assert)* Assert on `mut_arg` receiving an invalid arg ID or `mut_subcommand` receiving an invalid command name

### Compatibility

MSRV is now 1.60.0

Deprecated
- `Arg::use_value_delimiter` in favor of `Arg::value_delimiter` to avoid having multiple ways of doing the same thing
- `Arg::requires_all` in favor of `Arg::requires_ifs` now that it takes an `ArgPredicate` to avoid having multiple ways of doing the same thing
- `Arg::number_of_values` in favor of `Arg::num_args` to clarify semantic differences
- `default_value_os`, `default_values_os`, `default_value_if_os`, and `default_value_ifs_os` as the non `_os` variants now accept either a `str` or an `OsStr` (#4141)
- `Arg::env_os` in favor of `Arg::env`
- `Command::dont_collapse_args_in_usage` is now the default (#4151)
- `Command::trailing_var_arg` in favor of `Arg::trailing_var_arg` to make it clearer which arg it is meant to apply to (#4187)
- `Command::allow_hyphen_values` in favor of `Arg::allow_hyphen_values` to make it clearer which arg it is meant to apply to (#4187)
- `Command::allow_negative_numbers` in favor of `Arg::allow_negative_numbers` to make it clearer which arg it is meant to apply to (#4187)
- *(help)* Deprecated `Command::write_help` and `Command::write_long_help` in favor of `Command::render_help` and `Command::render_long_help` (#4248)
- *(derive)* `structopt` and `clap` attributes in favor of the more specific `command`, `arg`, and `value` to open the door for [more features](https://github.com/clap-rs/clap/issues/1807) and [clarify relationship to the builder](https://github.com/clap-rs/clap/discussions/4090) (#1807, #4180)
- *(derive)* `#[clap(value_parser)]` and `#[clap(action)]` defaulted attributes (its the default) (#3976)

Behavior Changes
- *(help)* With `wrap_help` feature, if the terminal size cannot be determined, `LINES` and `COLUMNS` variables are used (#4186)

### Features

- `Arg::num_args` now accepts ranges, allowing setting both the minimum and maximum number of values per occurrence (#2688, #4023)
- Allow non-bool `value_parser`s for `ArgAction::SetTrue` / `ArgAction::SetFalse` (#4092)
- Add `From<&OsStr>`, `From<OsString>`, `From<&str>`, and `From<String>` to `value_parser!` (#4257)
- Allow resetting most builder methods
- Can now pass runtime generated data to `Command`, `Arg`, `ArgGroup`, `PossibleValue`, etc without managing lifetimes with the `string` feature flag (#2150, #4223)
- New default `error-context`, `help` and `usage` feature flags that can be turned off for smaller binaries (#4236)
- Added `StyledStr::ansi()` to `Display` with ANSI escape codes (#4248)
- *(error)* `Error::apply` for changing the formatter for dropping binary size (#4111)
- *(error)* `Error::render`for formatting the error into a `StyledStr`
- *(help)* Show `PossibleValue::help` in long help (`--help`) (#3312)
- *(help)* New `{tab}` variable for `Command::help_template` (#4161)
- *(help)* `Command::render_help` and `Command::render_long_help` for formatting the error into a `StyledStr` (#3873, #4248)
- *(help)* `Command::render_usage` now returns a `StyledStr` (#4248)

### Fixes

- Verify `required` is not used with conditional required settings (#3660)
- Replaced `cmd.allow_invalid_for_utf8_external_subcommands` with `cmd.external_subcommand_value_parser` (#3733)
- `Arg::default_missing_value` now applies per occurrence rather than if a value is missing across all occurrences (#3998)
- `arg!(--long [value])` to accept `0..=1` per occurrence rather than across all occurrences, making it safe to use with `ArgAction::Append` (#4001)
- Allow `OsStr`s for `Arg::{required_if_eq,required_if_eq_any,required_if_eq_all}` (#4084)
- *(help)* With `wrap_help` feature, if the terminal size cannot be determined, `LINES` and `COLUMNS` variables are used (#4186)
- *(help)* Use `Command::display_name` in the help title rather than `Command::bin_name`
- *(help)* Show when a flag is `ArgAction::Count` by adding an `...` (#4003)
- *(help)* Use a more neutral palette for coloring (#4132, #4117)
- *(help)* Don't rely on ALL CAPS for help headers (#4132, #4123)
- *(help)* List subcommands first, focusing the emphasis on them (#4132, #4125)
- *(help)* Do not include global args in `cmd help help` (#4131)
- *(help)* Use `[positional]` in list when relevant (#4144)
- *(help)* Show all `[positional]` in usage (#4151)
- *(help)* Polish up subcommands by referring to them as commands (#4132, #4155)
- *(help)* Trim extra whitespace to avoid artifacts from different uses of templates (#4132, #4156)
- *(help)* Hint to the user the difference between `-h` / `--help` when applicable (#4132, #4159)
- *(help)* Shorten help by eliding name/version/author (#4132, #4160)
- *(help)* When short help is long enough to activate `next_line_help`, don't add blank lines (#4132, #4190)
- *(help)* Make help output more dense (reducing horizontal whitespace) (#4132, #4192)
- *(help)* Separate subcommand flags with "," like option flags (#4232, #4235)
- *(help)* Quote the suggested help flag (#4220)
- *(version)* Use `Command::display_name` rather than `Command::bin_name` (#3966)
- *(parser)* Always fill in `""` argument for external subcommands (#3263)
- *(parser)* Short flags now have higher precedence than hyphen values with `Arg::allow_hyphen_values`, like `Command::allow_hyphen_values` (#4187)
- *(parser)* Prefer `InvalidSubcommand` over `UnknownArgument` in more cases (#4219)
- *(derive)* Detect escaped external subcommands that look like built-in subcommands (#3703)
- *(derive)* Leave `Arg::id` as `verbatim` casing (#3282)
- *(derive)* Default to `#[clap(value_parser, action)]` instead of `#[clap(parse)]` (#3827)

## [3.2.18] - 2022-08-29

### Fixes

- *(help)* `Command::print_help` now respects `Command::colored_help`
- *(derive)* Improved error messages

## [3.2.17] - 2022-08-12

### Fixes

- *(derive)* Expose `#[clap(id = ...)]` attribute to match Arg's latest API

## [3.2.16] - 2022-07-30

### Fixes

- Ensure required arguments appear in errors when they are also members of a group (#4004)

## [3.2.15] - 2022-07-25

### Features

- *(derive)* New `default_values_t` and `default_values_os_t` attributes

## [3.2.14] - 2022-07-21

### Fixes

- A `multiple_values` positional followed by another positional now works with multiple flags

## [3.2.13] - 2022-07-19

### Documentation

- Pulled in tutorials, cookbook, and derive reference into rustdoc

## [3.2.12] - 2022-07-14

### Fixes

- Allow an arg to declare a conflict with a group

## [3.2.11] - 2022-07-13

### Features

- Added `Arg::get_all_short_aliaes` and `Arg::get_all_aliases`

## [3.2.10] - 2022-07-12

### Fixes

- Loosen lifetime on `Command::mut_subcommand`

## [3.2.8] - 2022-06-30

### Features

- Added `Command::mut_subcommand` to mirror `Command::mut_arg`

## [3.2.7] - 2022-06-28

### Fixes

- Global arguments should override env-sourced arguments

## [3.2.6] - 2022-06-21

### Fixes

- Don't panic when parsing `--=`

## [3.2.5] - 2022-06-15

### Fixes

- *(derive)* Fix regression with `#[clap(default_value_os_t ...)]` introduced in v3.2.3

## [3.2.4] - 2022-06-14

### Fixes

- *(derive)* Provide more clearer deprecation messages for `#[clap(parse)]` attribute (#3832)

## [3.2.3] - 2022-06-14

### Fixes

- Moved deprecations to be behind the `deprecated` Cargo.toml feature (#3830)
  - For now, it is disabled by default though we are considering enabling it by
    default as we release the next major version to help draw attention to the
    deprecation migration path

## [3.2.2] - 2022-06-14

### Fixes

- *(derive)* Improve the highlighted code for deprecation warnings

**gated behind `unstable-v4`**
- *(derive)* Default to `#[clap(value_parser, action)]` instead of `#[clap(parse)]` (#3827)

## [3.2.1] - 2022-06-13

## [3.2.0] - 2022-06-13

### Compatibility

MSRV is now 1.56.0 (#3732)

Behavior
- Defaults no longer satisfy `required` and its variants (#3793)
- When misusing `ArgMatches::value_of` and friends, debug asserts were turned into panics

Moving (old location deprecated)
- `clap::{PossibleValue, ValueHint}` to `clap::builder::{PossibleValue, ValueHint}`
- `clap::{Indices, OsValues, ValueSource, Values}` to `clap::parser::{Indices, OsValues, ValueSource, Values}`
- `clap::ArgEnum` to `clap::ValueEnum` (#3799)

Replaced
- `Arg::allow_invalid_utf8` with `Arg::value_parser(value_parser!(PathBuf))` (#3753)
- `Arg::validator` / `Arg::validator_os` with `Arg::value_parser` (#3753)
- `Arg::validator_regex` with users providing their own `builder::TypedValueParser` (#3756)
- `Arg::forbid_empty_values` with `builder::NonEmptyStringValueParser` / `builder::PathBufValueParser` (#3753)
- `Arg::possible_values` with `Arg::value_parser([...])`, `builder::PossibleValuesParser`, or `builder::EnumValueParser` (#3753)
- `Arg::max_occurrences` with `arg.action(ArgAction::Count).value_parser(value_parser!(u8).range(..N))` for flags (#3797)
- `Arg::multiple_occurrences` with `ArgAction::Append` or `ArgAction::Count` though positionals will need `Arg::multiple_values` (#3772, #3797)
- `Command::args_override_self` with `ArgAction::Set` (#2627, #3797)
- `AppSettings::NoAutoVersion` with `ArgAction` or `Command::disable_version_flag` (#3800)
- `AppSettings::NoHelpVersion` with `ArgAction` or `Command::disable_help_flag` / `Command::disable_help_subcommand` (#3800)
- `ArgMatches::{value_of, value_of_os, value_of_os_lossy, value_of_t}` with `ArgMatches::{get_one,remove_one}` (#3753)
- `ArgMatches::{values_of, values_of_os, values_of_os_lossy, values_of_t}` with `ArgMatches::{get_many,remove_many}` (#3753)
- `ArgMatches::is_valid_arg` with `ArgMatches::{try_get_one,try_get_many}` (#3753)
- `ArgMatches::occurrences_of` with `ArgMatches::value_source` or `ArgAction::Count` (#3797)
- `ArgMatches::is_present` with `ArgMatches::contains_id` or `ArgAction::SetTrue` (#3797)
- `ArgAction::StoreValue` with `ArgAction::Set` or `ArgAction::Append` (#3797)
- `ArgAction::IncOccurrences` with `ArgAction::SetTrue` or `ArgAction::Count` (#3797)
- *(derive)* `#[clap(parse(...))]` replaced with: (#3589, #3794)
  - For default parsers (no `parse` attribute), deprecation warnings can be
    silenced by opting into the new behavior by adding either `#[clap(action)]`
    or `#[clap(value_parser)]` (ie requesting the default behavior for these
    attributes).  Alternatively, the `unstable-v4` feature changes the default
    away from `parse` to `action`/`value_parser`.
  - For `#[clap(parse(from_flag))]` replaced with `#[clap(action = ArgAction::SetTrue)]` (#3794)
  - For `#[clap(parse(from_occurrences))]` replaced with `#[clap(action = ArgAction::Count)]` though the field's type must be `u8` (#3794)
  - For `#[clap(parse(from_os_str)]` for `PathBuf`, replace it with
    `#[clap(value_parser)]` (as mentioned earlier this will call
    `value_parser!(PathBuf)` which will auto-select the right `ValueParser`
    automatically).
  - For `#[clap(parse(try_from_str = ...)]`, replace it with `#[clap(value_parser = ...)]`
  - For most other cases, a type implementing `TypedValueParser` will be needed and specify it with `#[clap(value_parser = ...)]`

### Features

- Parsed, typed arguments via `Arg::value_parser` / `ArgMatches::{get_one,get_many}` (#2683, #3732)
  - Several built-in `TypedValueParser`s available with an API open for expansion
  - `value_parser!(T)` macro for selecting a parser for a given type (#3732) and open to expansion via the `ValueParserFactory` trait (#3755)
  - `[&str]` is implicitly a value parser for possible values
  - All `ArgMatches` getters do not assume required arguments (#2505)
  - Add `ArgMatches::remove_*` variants to transfer ownership
  - Add `ArgMatches::try_*` variants to avoid panics for developer errors (#3621)
  - Add a `get_raw` to access the underlying `OsStr`s
  - `PathBuf` value parsers imply `ValueHint::AnyPath` for completions (#3732)
- Explicit control over parsing via `Arg::action` (#3774)
  - `ArgAction::StoreValue`: existing `takes_value(true)` behavior
  - `ArgAction::IncOccurrences`: existing `takes_value(false)` behavior
  - `ArgAction::Help`: existing `--help` behavior
  - `ArgAction::Version`: existing `--version` behavior
  - `ArgAction::Set`: Overwrite existing values (like `Arg::multiple_occurrences` mixed with `Command::args_override_self`) (#3777)
  - `ArgAction::Append`: like `Arg::multiple_occurrences` (#3777)
  - `ArgAction::SetTrue`: Treat `--flag` as `--flag=true` (#3775)
    - Implies `Arg::default_value("false")` (#3786)
    - Parses `Arg::env` via `Arg::value_parser`
  - `ArgAction::SetFalse`: Treat `--flag` as `--flag=false` (#3775)
    - Implies `Arg::default_value("true")` (#3786)
    - Parses `Arg::env` via `Arg::value_parser`
  - `ArgAction::Count`: Treat `--flag --flag --flag` as `--flag=1 --flag=2 --flag=3` (#3775)
    - Implies `Arg::default_value("0")` (#3786)
    - Parses `Arg::env` via `Arg::value_parser`
- *(derive)* Opt-in to new `Arg::value_parser` / `Arg::action` with either `#[clap(value_parser)]` (#3589, #3742) / `#[clap(action)]` attributes (#3794)
  - Default `ValueParser` is determined by `value_parser!` (#3199, #3496)
  - Default `ArgAction` is determine by a hard-coded lookup on the type (#3794)
- `Command::multicall` is now stable for busybox-like programs and REPLs (#2861, #3684)
- `ArgMatches::{try_,}contains_id` for checking if there are values for an argument that mirrors the new `get_{one,many}` API

### Fixes

- Don't correct argument id in `default_value_ifs_os`(#3815)

*parser*
- Set `ArgMatches::value_source` and `ArgMatches::occurrences_of` for external subcommands (#3732)
- Use value delimiter for `Arg::default_missing_values` (#3761, #3765)
- Split`Arg::default_value` / `Arg::env` on value delimiters independent of whether `--` was used (#3765)
- Allow applying defaults to flags (#3294, 3775)
- Defaults no longer satisfy `required` and its variants (#3793)

## [3.1.18] - 2022-05-10

### Fixes

- Fix deprecated `arg_enum!` for users migrating to clap3 (#3717)
- Verify all `required_unless_present_all` arguments exist
- Verify group members exist before processing group members (#3711)
- *(help)* Use `...` when not enough `value_names` are supplied

**gated behind `unstable-v4`**
- Verify `required` is not used with conditional required settings (#3660)
- Disallow more `value_names` than `number_of_values` (#2695)
- *(parser)* Assert on unknown args when using external subcommands (#3703)
- *(parser)* Always fill in `""` argument for external subcommands (#3263)
- *(derive)* Detect escaped external subcommands that look like built-in subcommands (#3703)
- *(derive)* Leave `Arg::id` as `verbatim` casing (#3282)

## [3.1.17] - 2022-05-06

### Fixes

- Allow value names for `arg!` macro to have dashes when quoted, like longs

## [3.1.16] - 2022-05-06

### Fixes

- *(parser)* `Arg::exclusive` overrides `Arg::required`, like other conflicts
- *(error)* Don't duplicate arguments in usage
- *(error)* Don't show hidden arguments in conflict error usage
- *(help)* New `help_template` variable `{name}` to fix problems with `{bin}`
- *(help)* Don't wrap URLs

**gated behind `unstable-v4`**
- Leading dashes in `Arg::long` are no longer allowed
- *(help)* Use `Command::display_name` in the help title rather than `Command::bin_name`

## [3.1.15] - 2022-05-02

### Fixes

- *(error)* Render actual usage for unrecognized subcommands
- *(multicall)* Improve bad command error
- *(multicall)* Always require a multicall command
- *(multicall)* Disallow arguments on multicall parent command
- *(multicall)* More consistent with rest of clap errors


## [3.1.14] - 2022-05-01

### Fixes

- Panic when calling `Command::build` with a required positional argument nested several layers in subcommands

## [3.1.13] - 2022-04-30

### Fixes

- Help subcommand and `Command::write_help` now report required arguments in usage in more circumstances
- Unknown subcommand for help subcommand flag now reports an error with more context
- More details reported when using `debug` feature
- Allow disabling `color` feature with `debug` feature enabled

## [3.1.12] - 2022-04-22

### Fixes

- Regression in 3.1.11 where the (output) streams were crossed

## [3.1.11] - 2022-04-22

### Fixes

- Implied conflicts override `Arg::required`, making the behavior consistent with how we calculate conflicts for error reporting
- Members of a mutually exclusive `ArgGroup`  override `Arg::required`, making the behavior consistent with how we calculate conflicts for error reporting
- `Arg::overrides_with` always override `Arg::required`, not just when the parser processes an override

## [3.1.10] - 2022-04-19

### Features

- Expose `Command::build` for custom help generation or other command introspection needs

## [3.1.9] - 2022-04-15

### Fixes

- Pin the `clap_derive` version so a compatible version is always used with `clap`

## [3.1.8] - 2022-04-01

### Fixes

- Add `Debug` impls to more types

## [3.1.7] - 2022-03-31

### Fixes

- *(derive)* Abort, rather than ignore, when deriving `ArgEnum` with non-unit unskipped variants

## [3.1.6] - 2022-03-07

### Fixes

- Don't panic when validating delimited defaults (#3541)
- Make it clearer that `cargo` feature is needed
- Documentation improvements

## [3.1.5] - 2022-03-02

### Fixes

- Dependency upgrade

## [3.1.4] - 2022-03-02

### Features

- *(help)* Show `PossibleValue::help` in long help (`--help`)  **(gated behind `unstable-v4`)** (#3312)

## [3.1.3] - 2022-02-28

### Fixes

- Don't panic when validating delimited defaults (#3514)

## [3.1.2] - 2022-02-23

### Fixes

- *(derive)* Allow other attribute with a subcommand that has subcommands

### Documentation

- *(examples)* List example topics
- *(derive)* Clarify syntax and relation to builder API

## [3.1.1] - 2022-02-21

### Fixes

- Track caller for `ArgMatches` assertions so the user more easily sees where they need to fix the call

## [3.1.0] - 2022-02-16

### Compatibility

Changes in behavior of note that are not guaranteed to be compatible across releases:

- *(help)* `help` subcommand shows long help like `--help`, rather than short help (`-h`), deprecated `clap::AppSettings::UseLongFormatForHelpSubcommand` (#3440)
- *(help)* Pacman-style subcommands are now ordered the same as usage errors (#3470)
- *(help)* Pacman-style subcommands use standard alternate syntax in usage (#3470)

### Deprecations

- `clap::Command` is now preferred over `clap::App` (#3089 in #3472)
  - `clap::command!` is now preferred over `clap::app_from_crate` (#3089 in #3474)
  - `clap::CommandFactory::command` is now preferred over `clap::IntoApp::into_app` (#3089 in #3473)
- *(help)* `help` subcommand shows long help like `--help`, rather than short help (`-h`), deprecated `clap::AppSettings::UseLongFormatForHelpSubcommand` (#3440)
- *(error)* Deprecate `clap::AppSettings::WaitOnError`, leaving it to the user to implement
- *(validation)* `clap::Command::subcommand_required(true).arg_required_else_help(true)` is now preferred over `clap::AppSettings::SubcommandRequiredElseHelp` (#3280)
- *(builder)* `clap::AppSettings` are nearly all deprecated and replaced with builder methods and getters (#2717)
- *(builder)* `clap::ArgSettings` is deprecated and replaced with builder methods and getters (#2717)
- *(builder)* `clap::Arg::id` and `clap::ArgGroup::id` are now preferred over `clap::Arg::name` and `clap::ArgGroup::name` (#3335)
- *(help)* `clap::Command::next_help_heading` is now preferred over `clap::Command::help_heading` (#1807, #1553)
- *(error)* `clap::error::ErrorKind` is now preferred over `clap::ErrorKind` (#3395)
- *(error)* `clap::Error::kind()` is now preferred over `clap::Error::kind`
- *(error)* `clap::Error::context()` is now preferred over `clap::Error::info` (#2628)

Note: All items deprecated in 3.0.0 are now hidden in the documentation. (#3458)

### Features

- *(matches)* Add `clap::ArgMatches::value_source` to determine what insert the value (#1345)
- *(help)* Override derived display order with `clap::Command::next_display_order` (#1807)
- *(error)* Show possible values when an argument doesn't have a value (#3320)
- *(error)* New `clap::Error::context` API to open the door for fully-custom error messages (#2628)
  - *(error)* `clap::error::ErrorKind` now implements `Display`

### Fixes

- *(builder)* Some functions were renamed for consistency and fixing spelling issues
- *(builder)* Allow `clap::Command::color` to override previous calls (#3449)
- *(parse)* Propagate globals with multiple subcommands (#3428)
- *(validation)* Give `ArgRequiredElseHelp` precedence over `SubcommandRequired` (#3456)
- *(validation)* Default values no longer count as "present" for conflicts, requires, `clap::Command::arg_required_else_help`, etc (#3076, #1264)
- *(assert)* Report invalid defaults (#3202)
- *(help)* Clarify how to handle `-h` conflicts (#3403)
- *(help)* Make it easier to debug the addition of help flags (#3425)
- *(help)* Pacman-style subcommands are now separated with spaces (#3470)
- *(help)* Pacman-style subcommands are now ordered the same as usage errors (#3470)
- *(help)* Pacman-style subcommands use standard alternate syntax in usage (#3470)
- *(error)* Be consistent in showing of required attributes between errors / usage (#3390)
- *(error)* Show user's order of possible values, like in `--help` (#1549)
- *(error)* Allow customizing error type in `clap::error::Result` (#3395)

### Performance

- *(error)* Reduced stack size of `clap::Error` (#3395)

### Documentation

- *(builder)* Correct data take accepted for `clap::Arg::validator`
- *(derive)* Clarify `parse` attribute
- *(tutorial)* Demonstrate custom parsing
- *(example)* Consistently list out required feature flags (#3448)

## [3.0.14] - 2022-02-01

### Features

- Added `ArgMatches::args_present()` to check if any args are present
- Added `Error::kind()` as we work to deprecate direct member access for `Error`
- Added `App::get_version`
- Added `App::get_long_version`
- Added `App::get_author`
- Added `App::get_subcommand_help_heading`
- Added `App::get_subcommand_value_name`
- Added `App::get_after_help`
- Added `App::get_after_long_help`

### Performance

- Misc binary size reductions

## [3.0.13] - 2022-01-26

### Fixes

- Show optional flag values wrapped in `[]`

## [3.0.12] - 2022-01-24

### Features

- *(derive)* Support for `default_value_os_t`

## [3.0.11] - 2022-01-24

### Fixes

- Ensure conflicts work when they target a group with a default value

## [3.0.10] - 2022-01-18

### Fixes

- Resolve `panic!` from v3.0.8 when using `global_setting(PropagateVersion)`.

## [3.0.9] - 2022-01-17

### Features

- Added `App::find_subcommand_mut`

## [3.0.8] - 2022-01-17

### Fixes

- Respected `DisableColoredHelp` on `cmd help help`
- Provide a little more context when completing arguments for `cmd help`
- Provide more context for some asserts
- Small documentation improvements

## [3.0.7] - 2022-01-12

### Fixes

- Shift more asserts from parsing to `App` building (ie will now run in `App::debug_assert`)

**derive**
- Documentation fixes

## [3.0.6] - 2022-01-10

### Fixes

**derive**
- Don't assume user does `use clap::ArgEnum` (#3277)
- Documentation fixes

## [3.0.5] - 2022-01-05

### Fixes

- Provide hack to workaround [inability to detect external subcommands aliasing when escaped](https://github.com/clap-rs/clap/issues/3263) (#3264)

**docs:**
- Cleaned up code blocks in tutorials (#3261)
- Clean up quotes in `ArgMatches` asserts
- List correct replacement for deprecated `Parser::from_clap` (#3257)

## [3.0.4] - 2022-01-04

### Features

- For very limited cases, like `cargo`, expose `ArgMatches::is_valid_arg` to avoid panicing on undefined arguments

## [3.0.3] - 2022-01-04

### Fixes

- Specify cause of debug assert failure

## [3.0.2] - 2022-01-04

### Fixes

- Ignore `Last` when checking hyphen values (see #3249 for details)
- Help catch bugs with `#[must_use]`

## [3.0.1] - 2022-01-03

### Fixes

- Don't panic when getting number of values (#3241)
- Don't warn when using `default_value_t` derive attribute with a `Subcommand` (#3245)

Documentation
- Added `name` attribute to `ArgEnum` variant derive reference

## [3.0.0] - 2021-12-31

**Note:** clap v3 has been in development for several years and has changed
hands multiple times.  Unfortunately, our changelog might be incomplete,
whether in changes or their motivation.

### Highlights

A special thanks to the maintainers, contributors, beta users, and sponsors who
have helped along this journey, especially kbknapp.

**[StructOpt](https://docs.rs/structopt/) Integration**

[StructOpt](https://docs.rs/structopt/) provides a serde-like declarative
approach to defining your parser.  The main benefits we've seen so far from integrating are:
- Tighter feedback between the design of clap and the derives
- More universal traits.  Crates exist for common CLI patterns
  ([example](https://github.com/rust-cli/clap-verbosity-flag))
  and we've re-designed the `StructOpt` traits so crates built on clap3 can be
  reused not just with other derives but also people using the builder API.
  People can even hand implement these so people using the builder API won't
  have the pay the cost for derives.

**Custom Help Headings**

Previously, clap automatically grouped arguments in the help as either
`ARGS`, `FLAGS`, `OPTIONS`, and `SUBCOMMANDS`.

You can now override the default group with `Arg::help_heading` and
`App::subcommand_help_heading`.  To apply a heading to a series of arguments,
you can set `App::help_heading`.

**Deprecations**

While a lot of deprecations have been added to clean up the API (overloaded
meaning of `Arg::multiple`) or make things more consistent, some particular
highlights are:
- `clap_app!` has been deprecated in favor of the builder API with `arg!` ([clap-rs/clap#2835](https://github.com/clap-rs/clap/issues/2835))
- `Arg::from_usage` has been deprecated in favor of `arg!` ([clap-rs/clap#3087](https://github.com/clap-rs/clap/issues/3087))
  - [Porting example](https://github.com/clap-rs/clap/commit/4c4a2b86a08ef9e2d63010aab4909dd5a013dfb0) 
- The YAML API has been deprecated in favor the builder or derive APIs ([clap-rs/clap#3087](https://github.com/clap-rs/clap/issues/3087))

### Migrating

**From clap v2**

1. Add CLI tests, `-h` and `--help` output at a minimum (recommendation: [trycmd](https://docs.rs/trycmd/) for snapshot testing)
2. Update your dependency
    1. *If you use `no-default-features`:* add the `std` feature
3. Resolve compiler errors
4. Resolve behavior changes
    1. Refactor your `App` creation to a function and add a test similar to the one below, resolving any of its assertions
    2. Look over the "subtle changes" under BREAKING CHANGES
    3. *If using builder:* test your application under various circumstances to see if `ArgMatches` asserts regarding `AllowInvalidUtf8`.
5. *At your leisure:* resolve deprecation notices

Example test:
```rust
fn app() -> clap::App<'static> {
    ...
}

#[test]
fn verify_app() {
    app().debug_assert();
}
```

**From structopt 0.3.25**
<a name="migrate-structopt"></a>

1. Add CLI tests, `-h` and `--help` output at a minimum (recommendation: [trycmd](https://docs.rs/trycmd/) for snapshot testing)
2. Replace your dependency from `structopt = "..."` to `clap = { version = "3.0", features = ["derive"] }`
    1. *If you use `no-default-features`:* add the `std` feature
3. Resolve compiler errors, including
    1. Update your `use` statements from `structopt` and `structopt::clap` to `clap`
4. Resolve behavior changes
    1. Add a test similar to the one below, resolving any of its assertions
    2. Look over the "subtle changes" under BREAKING CHANGES
5. *At your leisure:* resolve deprecation notices

Example test:
```rust
#[derive(clap::StructOpt)]
struct Args {
    ...
}

#[test]
fn verify_app() {
    use clap::IntoApp;
    Args::into_app().debug_assert()
}
```

**From clap v3.0.0-beta.5**

1. Add CLI tests, `-h` and `--help` output at a minimum (recommendation: [trycmd](https://docs.rs/trycmd/) for snapshot testing)
2. Update your dependency
    1. Add in `derive`, `env`, `cargo`, or `unicode` feature flags as needed
3. Resolve compiler errors
    1. *If you use `yaml`, `clap_app!`, or usage parser:* revert any changes you made for clap3
    2. Change `Arg::about` `Arg::long_about` back to `help` and `long_help` and change `PossibleValue::about` to `help` ([clap-rs/clap#3075](https://github.com/clap-rs/clap/issues/3075))
    3. Change `AppSettings::HelpRequired` to `AppSettings::HelpExpected`
    4. Change `PossibleValue::hidden` to `PossibleValue::hide`
    5. Change `App::subcommand_placeholder` to `App::subcommand_value_name` / `App::subcommand_help_heading`
4. Resolve behavior changes
    1. Add the above listed test appropriate for your application and resolve any problems it reports
    2. *If using `derive`:* see the structopt breaking changes section for `Vec` changes
    3. *If using builder:* test your application under various circumstances to see if `ArgMatches` asserts regarding `AllowInvalidUtf8`.
5. *At your leisure:* resolve deprecation notices

### BREAKING CHANGES

**From clap 2**

Subtle changes (i.e. compiler won't catch):
- `AppSettings::UnifiedHelpMessage` is now default behaviour
  - `{flags}` and `{unified}` will assert if present in `App::help_template`
  - See [clap-rs/clap#2807](https://github.com/clap-rs/clap/issues/2807)
- `AppSettings::EnableColoredHelp` is now the default behavior but can be
  opted-out with `AppSettings::DisableColoredHelp`
  ([clap-rs/clap#2806](https://github.com/clap-rs/clap/issues/2806))
- `App::override_usage` no longer implies a leading `\t`, allowing multi lined usages
- `Arg::require_equals` no longer implies `ArgSettings::ForbidEmptyValues` ([#2233](https://github.com/clap-rs/clap/issues/2233))
- `Arg::require_delimiter` no longer implies `ArgSettings::TakesValue` and `ArgSettings::UseValueDelimiter` ([#2233](https://github.com/clap-rs/clap/issues/2233))
- `Arg::env`, `Arg::env_os`, `Arg::last`, `Arg::require_equals`, `Arg::allow_hyphen_values`,
  `Arg::hide_possible_values`, `Arg::hide_default_value`, `Arg::hide_env_values`,
  `Arg::case_insensitive` and `Arg::multiple_values` no longer imply `ArgSettings::TakesValue` ([#2233](https://github.com/clap-rs/clap/issues/2233))
- `ArgMatches::is_present` no longer checks subcommand names
- Some env variable values are now considered false for flags, not just "not-present" ([clap-rs/clap#2539](https://github.com/clap-rs/clap/issues/2539))
- Changed `...`s meaning in usage parser.  Before, it always meant `multiple` which is still true for `--option [val]...`.  Now `[name]... --option [val]` results in `ArgSettings::MultipleOccurrences`.
- Usage exit code changed from `1` to `2` ([clap-rs/clap#1327](https://github.com/clap-rs/clap/issues/1327))
- Reject `--foo=bar` when `takes_value(false)` ([clap-rs/clap#1543](https://github.com/clap-rs/clap/issues/1543))
- No longer accept an arbitrary number of `-` for long arguments (`-----long`)

Easier to catch changes:
- When using `no-default-features`, you now have to specify the `std` feature (reserved for future work)
- Gated env support behind `env` feature flag
  - Impacts `Arg::env`, `Arg::env_os`, `Arg::hide_env_values`, `ArgSettings::HideEnvValues`
  - See [clap-rs/clap#2694](https://github.com/clap-rs/clap/pull/2694)
- Gated crate information behind `cargo` feature flag
  - Impacts `crate_name!`, `crate_version!`, `crate_authors!`, `crate_description!`, `app_from_crate!`
- `AppSettings::StrictUtf8` is now default behaviour and asserts if
  `AppSettings::AllowInvalidUtf8ForExternalSubcommands` and
  `ArgSettings::AllowInvalidUtf8` and `ArgMatches::value_of_os` aren't used
  together
  - `AppSettings::AllowInvalidUtf8` has been removed
  - [clap-rs/clap#751](https://github.com/clap-rs/clap/issues/751)
- `Arg::short` and `Arg::value_delimiter` now take a `char` instead of a `&str`
- `ArgMatches` panics on unknown arguments
- Removed `VersionlessSubcommands`, making it the default (see [clap-rs/clap#2812](https://github.com/clap-rs/clap/issues/2812))
- Completion generation has been split out into [clap_complete](./clap_complete).
- Removed `ArgSettings::EmptyValues` in favor of `ArgSettings::ForbidEmptyValues`
- Validator signatures have been loosed:
  - `Arg::validator` now takes first argument as `Fn(&str) -> Result<O, E: ToString>` instead of
    `Fn(String) -> Result<(), String>`
  - `Arg::validator_os` now takes first argument as `Fn(&OsStr) -> Result<O, OsString>` instead of
    `Fn(&OsStr) -> Result<(), OsString>`
- `Arg::value_name` now sets, rather than appends (see [clap-rs/clap#2634](https://github.com/clap-rs/clap/issues/2634))
- Upgrade `yaml-rust` from 0.3 to 0.4
- Replaced `ArgGroup::from(BTreeMap)` to `ArgGroup::from(yaml)`
- Replaced `ArgMatches::usage` with `App::generate_usage`
- Replaced `Arg::settings` with `Arg::setting(Setting1 | Setting2)`
- `App` and `Arg` now need only one lifetime
- Removed deprecated `App::with_defaults`, replaced with `app_from_crate`
- Removed deprecated `AppSettings::PropagateGlobalValuesDown` (now the default)
- Some `App` functions, like `App::write_help` now take `&mut self` instead of `&self`
- `Error::message` is now private, use `Error::to_string`
- `Arg::default_value_if`, `Arg::default_value_if_os`, `Arg::default_value_ifs`,
  `Arg::default_value_ifs_os` now takes the default value parameter as an option ([clap-rs/clap#1406](https://github.com/clap-rs/clap/issues/1406))
- Changed `App::print_help` & `App::print_long_help` to now return `std::io::Result`
- Changed `App::write_help` & `App::write_long_help` to now return `std::io::Result`
- Changed `Arg::index`, `Arg::number_of_values`, `Arg::min_values`, `Arg::max_values` to taking `usize` instead of u64
- Changed `Error::info` to type `Vec<String>` instead of `Option<Vec<String>>`
- Changed `ArgMatches::subcommand` to now return `Option<(&str, &ArgMatches)>`
- Renamed `ErrorKind::MissingArgumentOrSubcommand` to `ErrorKind::DisplayHelpOnMissingArgumentOrSubcommand`
- Renamed `ErrorKind::HelpDisplayed` to `ErrorKind::DisplayHelp`
- Renamed `ErrorKind::VersionDisplayed` to `ErrorKind::DisplayVersion`
- Added `#[non_exhaustive]` to `clap::{ValueHint, ErrorKind, AppSettings, ArgSettings}` ([clap-rs/clap#3167](https://github.com/clap-rs/clap/pull/3167))

**From structopt 0.3.25**

- By default, the `App` isn't initialized with crate information anymore.  Now opt-in via `#[clap(author)]`, `#[clap(about)]`, `#[clap(version)]` ([clap-rs/clap#3034](https://github.com/clap-rs/clap/issues/3034))
- `#[clap(default_value)]` is replaced with `#[clap(default_value_t)]` ([clap-rs/clap#1694](https://github.com/clap-rs/clap/issues/1694))
- Subcommands nested under subcommands now needs a `#[clap(subcommand)]` attribute ([clap-rs/clap#2587](https://github.com/clap-rs/clap/pull/2587))
- `Vec<_>` and `Option<Vec<_>>` have changed from `multiple` to `multiple_occurrences`

On top of the clap 2 changes

### Performance

**From clap 2**

- Split out non-default `unicode` feature flag for faster builds and smaller binaries for ASCII-only CLIs.
- Split out non-default `env` feature flag  for faster builds and smaller binaries.

### Features

**From clap 2**

- Integration of `structopt::StructOpt` via `clap::Parser` (requires `derive` feature flag)
- Custom help headings
  - `App::help_heading` (apply to all future args)
  - `Arg::help_heading` (apply to current arg)
  - `App::subcommand_help_heading` along with `App::subcommand_value_name` (apply to subcommands)
  - See [clap-rs/clap#805](https://github.com/clap-rs/clap/issues/805)
  - `AppSettings::UnifiedHelpMessage` is now default behaviour ([clap-rs/clap#2807](https://github.com/clap-rs/clap/issues/2807))
- Deriving of `ArgEnum` for generating `Arg::possible_values` (requires `derive` feature flag)
- Disable built-in help/version behavior with `AppSettings::NoAutoHelp` and `AppSettings::NoAutoVersion`
- Change an existing arg with new builder method `mut_arg` (particularly helpful for `--help` and `--version`)
- Provide extra context in long help messages (`--help`) with `before_long_help` and `after_long_help` ([clap-rs/clap#1903](https://github.com/clap-rs/clap/issues/1903))
- Detect missing help descriptions via debug asserts by enabling `AppSettings::HelpExpected`
- Aliases for short flags ([clap-rs/clap#1896](https://github.com/clap-rs/clap/issues/1896))
- Validate UTF-8 values, rather than panicing during `ArgMatches::value_of` thanks to `AppSettings::AllowInvalidUtf8ForExternalSubcommands` and `ArgSettings::AllowInvalidUtf8`
  - Debug builds will assert when the `ArgMatches` calls do not match the UTF-8 setting.
  - See [clap-rs/clap#751](https://github.com/clap-rs/clap/issues/751)
- `clap::PossibleValue` to allow
  - Hiding ([clap-rs/clap#2756](https://github.com/clap-rs/clap/issues/2756))
  - Completion help for possible values for args ([clap-rs/clap#2731](https://github.com/clap-rs/clap/issues/2731))
- Allow arguments to conflict with all others via `Arg::exclusive` ([clap-rs/clap#1583](https://github.com/clap-rs/clap/issues/1583))
- Validate arguments with a regex (required `regex` feature flag)
  - See [clap-rs/clap](https://github.com/clap-rs/clap/issues/1968)
- `Arg::default_missing_value` for cases like `--color[=<WHEN>]` ([clap-rs/clap#1587](https://github.com/clap-rs/clap/pull/1587))
- `clap::App::color` / `clap::ColorChoice` to specify color setting for the app
- Custom error reporting with `App::error`
- `App::debug_assert` test helper
- Replace `Arg::multiple(bool)` with `Arg::multiple_values` / `Arg::multiple_occurrences`
  - Positionals can be either
- Added support for flag subcommands like pacman ([clap-rs/clap#1361](https://github.com/clap-rs/clap/issues/1361))
- Partial parsing via `AppSettings::IgnoreErrors` ([clap-rs/clap#1880](https://github.com/clap-rs/clap/issues/1880))
- Enable `cmd help` to print long help (`--help` instead of `-h`) with `AppSettings::UseLongFormatForHelpSubcommand` ([clap-rs/clap#2435](https://github.com/clap-rs/clap/issues/2435))
- Allow long arg abbreviations like we do with subcommands via `AppSettings::InferLongArgs` ([clap-rs/clap#2435](https://github.com/clap-rs/clap/issues/2435))
- Detect subcommands among positional arguments with `AppSettings::SubcommandPrecedenceOverArg`
- Give completion scripts hints with `Arg::value_hint` ([clap-rs/clap#1793](https://github.com/clap-rs/clap/pull/1793))
- Allow unsetting defaults with
- `Arg::default_value_if`, `Arg::default_value_if_os`, `Arg::default_value_ifs`,
  `Arg::default_value_ifs_os` ([clap-rs/clap#1406](https://github.com/clap-rs/clap/issues/1406))
- Interpret some env variable values as `false` for flags, in addition to "not-present" ([clap-rs/clap#2539](https://github.com/clap-rs/clap/issues/2539))
  - `n`, `no`, `f`, `false`, `off`, `0`
- Added `arg!` macro for creating an `Arg` from a compile-time usage parser

- *(Experimental)* Busybox-like multi-call support
  - See `AppSettings::Multicall` behind `unstable-multicall` feature flag
  - See [clap-rs/clap#1120](https://github.com/clap-rs/clap/issues/1120)
- *(Experimental)* Alias an argument to anything group of arguments
  - See `App::replace` behind `unstable-replace` feature flag
  - See [clap-rs#1603](https://github.com/clap-rs/clap/issues/1603)
- *(Experimental)* Grouping of multiple values within multiple occurrences
  - See `ArgMatches::grouped_values_of` behind `unstable-grouped` feature flag
  - See [clap-rs/clap#1026](https://github.com/clap-rs/clap/issues/1026)

**From structopt 0.3.25**

- Allow defaulting with native types via new `default_value_t [= <expr>]` attribute ([clap-rs/clap#1694](https://github.com/clap-rs/clap/issues/1694))
- New `update` API
- New `arg_enum` attribute for integrating with `ArgEnum` trait

On top of the clap 2 changes

### Fixes

**From clap 2**

- Correctly handle colored output on Windows
- Only generate version flags when `App::version`, `App::long_version` are set
  (see [clap-rs/clap#2812](https://github.com/clap-rs/clap/issues/2812))
- General completion script improvements
- Limited default help text wrapping to 100 when `wrap_help` feature is not enabled
- Be more specific than `Arg::multiple` with `Arg::multiple_values` and `Arg::multiple_occurrences`
- `app_from_crate!` defaults to separating multiple authors with `", "`
- Ensure all examples work
- `IgnoreCase` is now unicode aware (requires `unicode` feature flag)
- Always respect `ColorChoice::Never`, even if that means we skip colors in some cases
- `ArgMatches` panics on unknown arguments
- Gracefully handle empty `authors` field in `Cargo.toml` with `app_from_crate`
- Do not show `--help` in `cmd help` with `DisableHelpFlag` ([clap-rs/clap#3169](https://github.com/clap-rs/clap/pull/3169))
- Do not show `--help` in `cmd help help` that doesn't work ([clap-rs/clap#3169](https://github.com/clap-rs/clap/pull/3169))

**From structopt 0.3.25**

- Support `SubcommandsNegateReqs` by allowing required `Option<_>`s ([clap-rs/clap#2255](https://github.com/clap-rs/clap/issues/2255))
- Infer `AllowInvalidUtf8` based on parser ([clap-rs/clap#751](https://github.com/clap-rs/clap/issues/2255))
- Gracefully handle empty `authors` field in `Cargo.toml`
- Don't panic with `default_value_os` but treat it like `default_value` ([clap-rs/clap#3031](https://github.com/clap-rs/clap/issues/3031))
- When using `flatten` and `subcommand`, ensure our doc comment always overrides the nested container's doc comment, whether it has only `about` or `about` and `long_about` ([clap-rs/clap#3175](]https://github.com/clap-rs/clap/pull/3175))

On top of the clap 2 changes

### Minimum Required Rust

- As of this release, `clap` requires `rustc 1.54.0` or greater.

## [2.34.0] - 2021-11-30

- Updates to Rust 2018 edition and bumps the MSRV to Rust 1.46

## [2.33.4] - 2021-11-29

### Bug Fixes

* **prevents `panic`:**  swallows broken pipe errors on error output ([7a729bc4](https://github.com/kbknapp/clap-rs/commit/7a729bc4df2646b05f6bf15f001124cd39d076ce))

## [2.33.3] - 2020-08-13

### Improvements

* Suppress deprecation warnings when using `crate_*` macros.

## [2.33.2] - 2020-08-5

#### Documentation

* Fixed links to `2.x` examples. Now they point to the right place.

## [2.33.1] - 2020-05-11

### Bug Fixes

* Windows: Prevent some panics when parsing invalid Unicode on Windows ([922c645](https://github.com/clap-rs/clap/commit/922c64508389170c9c77f1c8a4e597d14d3ed2f0), closes [#1905](https://github.com/clap-rs/clap/issues/1905))

### Documentation

*   fixes versions referenced in the README ([d307466a](https://github.com/kbknapp/clap-rs/commit/d307466af1013f172b8ec0252f01a473e2192d6b))
* **README.md:**
  *  cuts down the number of examples to reduce confusion ([6e508ee0](https://github.com/kbknapp/clap-rs/commit/6e508ee09e7153de4adf4e88b0aa6418a537dadd))

### Improvements

* **Deps:**  doesnt compile ansi_term on Windows since its not used ([b57ee946](https://github.com/kbknapp/clap-rs/commit/b57ee94609da3ddc897286cfba968f26ff961491), closes [#1155](https://github.com/kbknapp/clap-rs/issues/1155))

### Minimum Required Rust

* As of this release, `clap` requires `rustc 1.36.0` or greater.

## [2.33.0] - 2019-04-06

#### New Sponsor

*   Stephen Oats is now a sponsor \o/ ([823457c0](https://github.com/clap-rs/clap/commit/823457c0ef5e994ed7080cf62addbfe1aa3b1833))
* **SPONSORS.md:**  fixes Josh Triplett's info in the sponsor document ([24cb5740](https://github.com/clap-rs/clap/commit/24cb574090a11159b48bba105d5ec2dfb0a20e4e))

#### Features

* **Completions:**  adds completion support for Elvish. ([e9d0562a](https://github.com/clap-rs/clap/commit/e9d0562a1dc5dfe731ed7c767e6cee0af08f0cf9))
* There is a new setting to disable automatic building of `--help` and `-h` flags (`AppSettings::DisableAutoHelp`)

#### Improvements

* **arg_matches.rs:**  add Debug implementations ([47192b7a](https://github.com/clap-rs/clap/commit/47192b7a2d84ec716b81ae4af621e008a8762dc9))
* **macros:**  Support shorthand syntax for ArgGroups ([df9095e7](https://github.com/clap-rs/clap/commit/df9095e75bb1e7896415251d0d4ffd8a0ebcd559))

#### Documentation

*   Refer to macOS rather than OSX. ([ab0d767f](https://github.com/clap-rs/clap/commit/ab0d767f3a5a57e2bbb97d0183c2ef63c8c77a6c))
* **README.md:**  use https for all links ([96a7639a](https://github.com/clap-rs/clap/commit/96a7639a36bcb184c3f45348986883115ef1ab3a))

#### Bug Fixes

*   add debug assertion for missing args in subcommand ArgGroup ([2699d9e5](https://github.com/clap-rs/clap/commit/2699d9e51e7eadc258ba64c4e347c5d1fef61343))
*   Restore compat with Rust 1.21 ([6b263de1](https://github.com/clap-rs/clap/commit/6b263de1d42ede692ec5ee55019ad2fc6386f92e))
*   Don't mention unused subcommands ([ef92e2b6](https://github.com/clap-rs/clap/commit/ef92e2b639ed305bdade4741f60fa85cb0101c5a))
* **OsValues:**  Add `ExactSizeIterator` implementation ([356c69e5](https://github.com/clap-rs/clap/commit/356c69e508fd25a9f0ea2d27bf80ae1d9a8d88f4))
* **arg_enum!:**
  *  Fix comma position for valid values. ([1f1f9ff3](https://github.com/clap-rs/clap/commit/1f1f9ff3fa38a43231ef8be9cfea89a32e53f518))
  *  Invalid expansions of some trailing-comma patterns ([7023184f](https://github.com/clap-rs/clap/commit/7023184fca04e852c270341548d6a16207d13862))
* **completions:**  improve correctness of completions when whitespace is involved ([5a08ff29](https://github.com/clap-rs/clap/commit/5a08ff295b2aa6ce29420df6252a0e3ff4441bdc))
* **help message:**  Unconditionally uses long description for subcommands ([6acc8b6a](https://github.com/clap-rs/clap/commit/6acc8b6a621a765cbf513450188000d943676a30), closes [#897](https://github.com/clap-rs/clap/issues/897))
* **macros:**  fixes broken pattern which prevented calling multi-argument Arg methods ([9e7a352e](https://github.com/clap-rs/clap/commit/9e7a352e13aaf8025d80f2bac5c47fb32528672b))
* **parser:**  Better interaction between AllowExternalSubcommands and SubcommandRequired ([9601c95a](https://github.com/clap-rs/clap/commit/9601c95a03d2b82bf265c328b4769238f1b79002))

#### Minimum Required Rust

* As of this release, `clap` requires `rustc 1.31.0` or greater.

## v2.32.0 (2018-06-26)

#### Minimum Required Rust

* As of this release, `clap` requires `rustc 1.21.0` or greater.


#### Features

* **Completions:**  adds completion support for Elvish. ([e9d0562a](https://github.com/clap-rs/clap/commit/e9d0562a1dc5dfe731ed7c767e6cee0af08f0cf9))

#### Improvements

* **macros:**  Support shorthand syntax for ArgGroups ([df9095e7](https://github.com/clap-rs/clap/commit/df9095e75bb1e7896415251d0d4ffd8a0ebcd559))

#### Bug Fixes

* **OsValues:**  Add `ExactSizeIterator` implementation ([356c69e5](https://github.com/clap-rs/clap/commit/356c69e508fd25a9f0ea2d27bf80ae1d9a8d88f4))
* **arg_enum!:**  Invalid expansions of some trailing-comma patterns ([7023184f](https://github.com/clap-rs/clap/commit/7023184fca04e852c270341548d6a16207d13862))
* **help message:**  Unconditionally uses long description for subcommands ([6acc8b6a](https://github.com/clap-rs/clap/commit/6acc8b6a621a765cbf513450188000d943676a30), closes [#897](https://github.com/clap-rs/clap/issues/897))

#### Documentation

*   Refer to macOS rather than OSX. ([ab0d767f](https://github.com/clap-rs/clap/commit/ab0d767f3a5a57e2bbb97d0183c2ef63c8c77a6c))



## v2.31.2 (2018-03-19)

#### Bug Fixes

* **Fish Completions:**  fixes a bug that only allowed a single completion in in Fish Shell ([e8774a8](https://github.com/clap-rs/clap/pull/1214/commits/e8774a84ee4a319c888036e7c595ab46451d8e48), closes [#1212](https://github.com/clap-rs/clap/issues/1212))
* **AllowExternalSubcommands**: fixes a bug where external subcommands would be blocked by a similarly named subcommand (suggestions were getting in the way). ([a410e85](https://github.com/clap-rs/clap/pull/1215/commits/a410e855bcd82b05f9efa73fa8b9774dc8842c6b))

#### Documentation

* Fixes some typos in the `README.md` ([c8e685d7](https://github.com/clap-rs/clap/commit/c8e685d76adee2a3cc06cac6952ffcf6f9548089))

## v2.31.1 (2018-03-06)


#### Improvements

* **AllowMissingPositional:**  improves the ability of AllowMissingPositional to allow 'skipping' to the last positional arg with '--' ([df20e6e2](https://github.com/clap-rs/clap/commit/df20e6e24b4e782be0b423b484b9798e3e2efe2f))


## v2.31.0 (2018-03-04)


#### Features

* **Arg Indices:**  adds the ability to query argument value indices ([f58d0576](https://github.com/clap-rs/clap/commit/f58d05767ec8133c8eb2de117cb642b9ae29ccbc))
* **Indices:**  implements an Indices<Item=&usize> iterator ([1e67be44](https://github.com/clap-rs/clap/commit/1e67be44f0ccf161cc84c4e6082382072e89c302))
* **Raw Args** adds a convenience function to `Arg` that allows implying all of `Arg::last` `Arg::allow_hyphen_values` and `Arg::multiple(true)` ([66a78f29](https://github.com/clap-rs/clap/commit/66a78f2972786f5fe7c07937a1ac23da2542afd2))

#### Documentation

*   Fix some typos and markdown issues. ([935ba0dd](https://github.com/clap-rs/clap/commit/935ba0dd547a69c3f636c5486795012019408794))
* **Arg Indices:**  adds the documentation for the arg index querying methods ([50bc0047](https://github.com/clap-rs/clap/commit/50bc00477afa64dc6cdc5de161d3de3ba1d105a7))
* **CONTRIBUTING.md:**  fix url to clippy upstream repo to point to https://github.com/rust-lang-nursery/rust-clippy instead of https://github.com/Manishearth/rust-clippy ([42407d7f](https://github.com/clap-rs/clap/commit/42407d7f21d794103cda61f49d2615aae0a4bcd9))
* **Values:**  improves the docs example of the Values iterator ([74075d65](https://github.com/clap-rs/clap/commit/74075d65e8db1ddb5e2a4558009a5729d749d1b6))
* Updates readme to hint that the `wrap_help` feature is a thing ([fc7ab227](https://github.com/clap-rs/clap/commit/66a78f2972786f5fe7c07937a1ac23da2542afd2))

### Improvements

*  Cargo.toml: use codegen-units = 1 in release and bench profiles ([19f425ea](https://github.com/clap-rs/clap/commit/66a78f2972786f5fe7c07937a1ac23da2542afd2))
*  Adds WASM support (clap now compiles on WASM!) ([689949e5](https://github.com/clap-rs/clap/commit/689949e57d390bb61bc69f3ed91f60a2105738d0))
*  Uses the short help tool-tip for PowerShell completion scripts ([ecda22ce](https://github.com/clap-rs/clap/commit/ecda22ce7210ce56d7b2d1a5445dd1b8a2959656))


## v2.30.0 (2018-02-13)

#### Bug Fixes

* **YAML:** Adds a missing conversion from  `Arg::last` when instantiating from a YAML file ([aab77c81a5](https://github.com/clap-rs/clap/pull/1175/commits/aab77c81a519b045f95946ae0dd3e850f9b93070), closes [#1160](https://github.com/clap-rs/clap/issues/1173))

#### Improvements

* **Bash Completions:**  instead of completing a generic option name, all bash completions fall back to file completions UNLESS `Arg::possible_values` was used ([872f02ae](https://github.com/clap-rs/clap/commit/872f02aea900ffa376850a279eb164645e1234fa))
* **Deps:**  No longer needlessly compiles `ansi_term` on Windows since its not used ([b57ee946](https://github.com/clap-rs/clap/commit/b57ee94609da3ddc897286cfba968f26ff961491), closes [#1155](https://github.com/clap-rs/clap/issues/1155))
* **Help Message:** changes the `[values: foo bar baz]` array to `[possible values: foo bar baz]` for consistency with the API ([414707e4e97](https://github.com/clap-rs/clap/pull/1176/commits/414707e4e979d07bfe555247e5d130c546673708), closes [#1160](https://github.com/clap-rs/clap/issues/1160))


## v2.29.4 (2018-02-06)


#### Bug Fixes

* **Overrides Self:**  fixes a bug where options with multiple values couldn't ever have multiple values ([d95907cf](https://github.com/clap-rs/clap/commit/d95907cff6d011a901fe35fa00b0f4e18547a1fb))



## v2.29.3 (2018-02-05)


#### Improvements

* **Overrides:**  clap now supports arguments which override with themselves ([6c7a0010](https://github.com/clap-rs/clap/commit/6c7a001023ca1eac1cc6ffe6c936b4c4a2aa3c45), closes [#976](https://github.com/clap-rs/clap/issues/976))

#### Bug Fixes

* **Requirements:**  fixes an issue where conflicting args would still show up as required ([e06cefac](https://github.com/clap-rs/clap/commit/e06cefac97083838c0a4e1444dcad02a5c3f911e), closes [#1158](https://github.com/clap-rs/clap/issues/1158))
* Fixes a bug which disallows proper nesting of `--` ([73993fe](https://github.com/clap-rs/clap/commit/73993fe30d135f682e763ec93dcb0814ed518011), closes [#1161](https://github.com/clap-rs/clap/issues/1161))

#### New Settings

* **AllArgsOverrideSelf:**  adds a new convenience setting to allow all args to override themselves ([4670325d](https://github.com/clap-rs/clap/commit/4670325d1bf0369addec2ae2bcb56f1be054c924))



## v2.29.2 (2018-01-16)


#### Features

* **completions/zsh.rs:**
  *  Escape possible values for options ([25561dec](https://github.com/clap-rs/clap/commit/25561decf147d329b64634a14d9695673c2fc78f))
  *  Implement positional argument possible values completion ([f3b0afd2](https://github.com/clap-rs/clap/commit/f3b0afd2bef8b7be97162f8a7802ddf7603dff36))
  *  Complete positional arguments properly ([e39aeab8](https://github.com/clap-rs/clap/commit/e39aeab8487596046fbdbc6a226e5c8820585245))

#### Bug Fixes

* **completions/zsh.rs:**
  *  Add missing autoload for is-at-least ([a6522607](https://github.com/clap-rs/clap/commit/a652260795d1519f6ec2a7a09ccc1258499cad7b))
  *  Don't pass -S to _arguments if Zsh is too old ([16b4f143](https://github.com/clap-rs/clap/commit/16b4f143ff466b7ef18a267bc44ade0f9639109b))
  *  Maybe fix completions with mixed positionals and subcommands ([1146f0da](https://github.com/clap-rs/clap/commit/1146f0da154d6796fbfcb09db8efa3593cb0d898))
* **completions/zsh.zsh:**  Remove redundant code from output ([0e185b92](https://github.com/clap-rs/clap/commit/0e185b922ed1e0fd653de00b4cd8d567d72ff68e), closes [#1142](https://github.com/clap-rs/clap/issues/1142))



### 2.29.1 (2018-01-09)


#### Documentation

*   fixes broken links. ([56e734b8](https://github.com/clap-rs/clap/commit/56e734b839303d733d2e5baf7dac39bd7b97b8e4))
*   updates contributors list ([e1313a5a](https://github.com/clap-rs/clap/commit/e1313a5a0f69d8f4016f73b860a63af8318a6676))

#### Performance

*   further debloating by removing generics from error cases ([eb8d919e](https://github.com/clap-rs/clap/commit/eb8d919e6f3443db279ba0c902f15d76676c02dc))
*   debloats clap by deduplicating logic and refactors ([03e413d7](https://github.com/clap-rs/clap/commit/03e413d7175d35827cd7d8908d47dbae15a849a3))

#### Bug Fixes

*   fixes the ripgrep benchmark by adding a value to a flag that expects it ([d26ab2b9](https://github.com/clap-rs/clap/commit/d26ab2b97cf9c0ea675b440b7b0eaf6ac3ad01f4))
* **bash completion:**  Change the bash completion script code generation to support hyphens. ([ba7f1d18](https://github.com/clap-rs/clap/commit/ba7f1d18eba7a07ce7f57e0981986f66c994b639))
* **completions/zsh.rs:**  Fix completion of long option values ([46365cf8](https://github.com/clap-rs/clap/commit/46365cf8be5331ba04c895eb183e2f230b5aad51))


## 2.29.0 (2017-12-02)


#### API Additions

* **Arg:**  adds Arg::hide_env_values(bool) which allows one to hide any current env values and display only the key in help messages ([fb41d062](https://github.com/clap-rs/clap/commit/fb41d062eedf37cb4f805c90adca29909bd197d7))



## 2.28.0 (2017-11-28)

The minimum required Rust is now 1.20. This was done to start using bitflags 1.0 and having >1.0 deps is a *very good* thing!

#### Documentation

*   changes the demo version to 2.28 to stay in sync ([ce6ca492](https://github.com/clap-rs/clap/commit/ce6ca492c7510ab6474075806360b96081b021a9))
*   Fix URL path to github hosted files ([ce72aada](https://github.com/clap-rs/clap/commit/ce72aada56a9581d4a6cb4bf9bdb861c3906f8df), closes [#1106](https://github.com/clap-rs/clap/issues/1106))
*   fix typo ([002b07fc](https://github.com/clap-rs/clap/commit/002b07fc98a1c85acb66296b1eec0b2aba906125))
* **README.md:**  updates the readme and pulls out some redundant sections ([db6caf86](https://github.com/clap-rs/clap/commit/db6caf8663747e679d2f4ed3bd127f33476754aa))

#### Improvements

*   adds '[SUBCOMMAND]' to usage strings with only AppSettings::AllowExternalSubcommands is used with no other subcommands ([e78bb757](https://github.com/clap-rs/clap/commit/e78bb757a3df16e82d539e450c06767a6bfcf859), closes [#1093](https://github.com/clap-rs/clap/issues/1093))

#### API Additions

*   Adds Arg::case_insensitive(bool) which allows matching Arg::possible_values without worrying about ASCII case ([1fec268e](https://github.com/clap-rs/clap/commit/1fec268e51736602e38e67c76266f439e2e0ef12), closes [#1118](https://github.com/clap-rs/clap/issues/1118))
*   Adds the traits to be used with the clap-derive crate to be able to use Custom Derive ([6f4c3412](https://github.com/clap-rs/clap/commit/6f4c3412415e882f5ca2cc3fbd6d4dce79440828))

#### Bug Fixes

*   Fixes a regression where --help couldn't be overridden ([a283d69f](https://github.com/clap-rs/clap/commit/a283d69fc08aa016ae1bf9ba010012abecc7ba69), closes [#1112](https://github.com/clap-rs/clap/issues/1112))
*   fixes a bug that allowed options to pass parsing when no value was provided ([2fb75821](https://github.com/clap-rs/clap/commit/2fb758219c7a60d639da67692e100b855a8165ac), closes [#1105](https://github.com/clap-rs/clap/issues/1105))
*   ignore PropagateGlobalValuesDown deprecation warning ([f61ce3f5](https://github.com/clap-rs/clap/commit/f61ce3f55fe65e16b3db0bd4facdc4575de22767), closes [#1086](https://github.com/clap-rs/clap/issues/1086))

#### Deps

*  Updates `bitflags` to 1.0



## v2.27.1 (2017-10-24)


#### Bug Fixes

* Adds `term_size` as an optional dependency (with feature `wrap_help`) to fix compile bug

## v2.27.0 (2017-10-24)

** This release raises the minimum required version of Rust to 1.18 **

** This release also contains a very minor breaking change to fix a bug **

The only CLIs affected will be those using unrestrained multiple values and subcommands where the
subcommand name can coincide with one of the multiple values.

See the commit [0c223f54](https://github.com/clap-rs/clap/commit/0c223f54ed46da406bc8b43a5806e0b227863b31) for full details.


#### Bug Fixes

*   Values from global args are now propagated UP and DOWN!
*   fixes a bug where using AppSettings::AllowHyphenValues would allow invalid arguments even when there is no way for them to be valid ([77ed4684](https://github.com/clap-rs/clap/commit/77ed46841fc0263d7aa32fcc5cc49ef703b37c04), closes [#1066](https://github.com/clap-rs/clap/issues/1066))
*   when an argument requires a value and that value happens to match a subcommand name, its parsed as a value ([0c223f54](https://github.com/clap-rs/clap/commit/0c223f54ed46da406bc8b43a5806e0b227863b31), closes [#1031](https://github.com/clap-rs/clap/issues/1031), breaks [#](https://github.com/clap-rs/clap/issues/), [#](https://github.com/clap-rs/clap/issues/))
*   fixes a bug that prevented number_of_values and default_values to be used together ([5eb342a9](https://github.com/clap-rs/clap/commit/5eb342a99dde07b0f011048efde3e283bc1110fc), closes [#1050](https://github.com/clap-rs/clap/issues/1050), [#1056](https://github.com/clap-rs/clap/issues/1056))
*   fixes a bug that didn't allow args with default values to have conflicts ([58b5b4be](https://github.com/clap-rs/clap/commit/58b5b4be315280888d50d9b15119b91a9028f050), closes [#1071](https://github.com/clap-rs/clap/issues/1071))
*   fixes a panic when using global args and calling App::get_matches_from_safe_borrow multiple times ([d86ec797](https://github.com/clap-rs/clap/commit/d86ec79742c77eb3f663fb30e225954515cf25bb), closes [#1076](https://github.com/clap-rs/clap/issues/1076))
*   fixes issues and potential regressions with global args values not being propagated properly or at all ([a43f9dd4](https://github.com/clap-rs/clap/commit/a43f9dd4aaf1864dd14a3c28dec89ccdd70c61e5), closes [#1010](https://github.com/clap-rs/clap/issues/1010), [#1061](https://github.com/clap-rs/clap/issues/1061), [#978](https://github.com/clap-rs/clap/issues/978))
*   fixes a bug where default values are not applied if the option supports zero values ([9c248cbf](https://github.com/clap-rs/clap/commit/9c248cbf7d8a825119bc387c23e9a1d1989682b0), closes [#1047](https://github.com/clap-rs/clap/issues/1047))

#### Documentation

*   adds additional blurbs about using multiples with subcommands ([03455b77](https://github.com/clap-rs/clap/commit/03455b7751a757e7b2f6ffaf2d16168539c99661))
*   updates the docs to reflect changes to global args and that global args values can now be propagated back up the stack ([ead076f0](https://github.com/clap-rs/clap/commit/ead076f03ada4c322bf3e34203925561ec496d87))
*   add html_root_url attribute ([e67a061b](https://github.com/clap-rs/clap/commit/e67a061bcf567c6518d6c2f58852e01f02764b22))
*   sync README version numbers with crate version ([5536361b](https://github.com/clap-rs/clap/commit/5536361bcda29887ed86bb68e43d0b603cbc423f))

#### Improvements

*   args that have require_delimiter(true) is now reflected in help and usage strings ([dce61699](https://github.com/clap-rs/clap/commit/dce616998ed9bd95e8ed3bec1f09a4883da47b85), closes [#1052](https://github.com/clap-rs/clap/issues/1052))
*   if all subcommands are hidden, the subcommands section of the help message is no longer displayed ([4ae7b046](https://github.com/clap-rs/clap/commit/4ae7b0464750bc07ec80ece38e43f003fdd1b8ae), closes [#1046](https://github.com/clap-rs/clap/issues/1046))

#### Breaking Changes

*   when an argument requires a value and that value happens to match a subcommand name, its parsed as a value ([0c223f54](https://github.com/clap-rs/clap/commit/0c223f54ed46da406bc8b43a5806e0b227863b31), closes [#1031](https://github.com/clap-rs/clap/issues/1031), breaks [#](https://github.com/clap-rs/clap/issues/), [#](https://github.com/clap-rs/clap/issues/))

#### Deprecations

* **AppSettings::PropagateGlobalValuesDown:**  this setting is no longer required to propagate values down or up ([2bb5ddce](https://github.com/clap-rs/clap/commit/2bb5ddcee61c791ca1aaca494fbeb4bd5e277488))



## v2.26.2 (2017-09-14)


#### Improvements

*   if all subcommands are hidden, the subcommands section of the help message is no longer displayed ([4ae7b046](https://github.com/clap-rs/clap/commit/4ae7b0464750bc07ec80ece38e43f003fdd1b8ae), closes [#1046](https://github.com/clap-rs/clap/issues/1046))

#### Bug Fixes

*   fixes a bug where default values are not applied if the option supports zero values ([9c248cbf](https://github.com/clap-rs/clap/commit/9c248cbf7d8a825119bc387c23e9a1d1989682b0), closes [#1047](https://github.com/clap-rs/clap/issues/1047))



## v2.26.1 (2017-09-14)


#### Bug Fixes

*   fixes using require_equals(true) and min_values(0) together ([10ae208f](https://github.com/clap-rs/clap/commit/10ae208f68518eff6e98166724065745f4083174), closes [#1044](https://github.com/clap-rs/clap/issues/1044))
*   escape special characters in zsh and fish completions ([87e019fc](https://github.com/clap-rs/clap/commit/87e019fc84ba6193a8c4ddc26c61eb99efffcd25))
*   avoid panic generating default help msg if term width set to 0 due to bug in textwrap 0.7.0 ([b3eadb0d](https://github.com/clap-rs/clap/commit/b3eadb0de516106db4e08f078ad32e8f6d6e7a57))
*   Change `who's` -> `whose` ([53c1ffe8](https://github.com/clap-rs/clap/commit/53c1ffe87f38b05d8804a0f7832412a952845349))
*   adds a debug assertion to ensure all args added to groups actually exist ([7ad123e2](https://github.com/clap-rs/clap/commit/7ad123e2c02577e3ca30f7e205181e896b157d11), closes [#917](https://github.com/clap-rs/clap/issues/917))
*   fixes a bug where args that allow values to start with a hyphen couldn't contain a double hyphen -- as a value ([ab2f4c9e](https://github.com/clap-rs/clap/commit/ab2f4c9e563e36ec739a4b55d5a5b76fdb9e9fa4), closes [#960](https://github.com/clap-rs/clap/issues/960))
*   fixes a bug where positional argument help text is misaligned ([54c16836](https://github.com/clap-rs/clap/commit/54c16836dea4651806a2cfad53146a83fa3abf21))
* **Help Message:**  fixes long_about not being usable ([a8257ea0](https://github.com/clap-rs/clap/commit/a8257ea0ffb812e552aca256c4a3d2aebfd8065b), closes [#1043](https://github.com/clap-rs/clap/issues/1043))
* **Suggestions:**  output for flag after subcommand ([434ea5ba](https://github.com/clap-rs/clap/commit/434ea5ba71395d8c1afcf88e69f0b0d8339b01a1))



## v2.26.0 (2017-07-29)

Minimum version of Rust is now v1.13.0 (Stable)


#### Improvements

*   bumps unicode-segmentation to v1.2 ([cd7b40a2](https://github.com/clap-rs/clap/commit/cd7b40a21c77bae17ba453c5512cb82b7d1ce474))


#### Performance

*   update textwrap to version 0.7.0 ([c2d4e637](https://github.com/clap-rs/clap/commit/c2d4e63756a6f070e38c16dff846e9b0a53d6f93))




## v2.25.1 (2017-07-21)

#### Improvements

* impl Default for Values + OsValues for any lifetime. ([fb7d6231f1](https://github.com/clap-rs/clap/commit/fb7d6231f13a2f79f411e62dca210b7dc9994c18))

#### Documentation

* Various documentation typos and grammar fixes

## v2.25.0 (2017-06-20)


#### Features

*   use textwrap crate for wrapping help texts ([b93870c1](https://github.com/clap-rs/clap/commit/b93870c10ae3bd90d233c586a33e086803117285))

#### Improvements

* **Suggestions:**  suggests to use flag after subcommand when applicable ([2671ca72](https://github.com/clap-rs/clap/commit/2671ca7260119d4311d21c4075466aafdd9da734))
* Bumps bitflags crate to v0.9

#### Documentation

*   Change `who's` -> `whose` ([53c1ffe8](https://github.com/clap-rs/clap/commit/53c1ffe87f38b05d8804a0f7832412a952845349))

#### Documentation

* **App::template:**  adds details about the necessity to use AppSettings::UnifiedHelpMessage when using {unified} tags in the help template ([cbea3d5a](https://github.com/clap-rs/clap/commit/cbea3d5acf3271a7a734498c4d99c709941c331e), closes [#949](https://github.com/clap-rs/clap/issues/949))
* **Arg::allow_hyphen_values:**  updates the docs to include warnings for allow_hyphen_values and multiple(true) used together ([f9b0d657](https://github.com/clap-rs/clap/commit/f9b0d657835d3f517f313d70962177dc30acf4a7))
* **README.md:**
  *  added a warning about using ~ deps ([821929b5](https://github.com/clap-rs/clap/commit/821929b51bd60213955705900a436c9a64fcb79f), closes [#964](https://github.com/clap-rs/clap/issues/964))
* **clap_app!:**  adds using the @group specifier to the macro docs ([826048cb](https://github.com/clap-rs/clap/commit/826048cb3cbc0280169303f1498ff0a2b7395883), closes [#932](https://github.com/clap-rs/clap/issues/932))



## v2.24.2 (2017-05-15)


#### Bug Fixes

*   adds a debug assertion to ensure all args added to groups actually exist ([14f6b8f3](https://github.com/clap-rs/clap/commit/14f6b8f3a2f6df73aeeec9c54a54909b1acfc158), closes [#917](https://github.com/clap-rs/clap/issues/917))
*   fixes a bug where args that allow values to start with a hyphen couldn't contain a double hyphen -- as a value ([ebf73a09](https://github.com/clap-rs/clap/commit/ebf73a09db6f3c03c19cdd76b1ba6113930e1643), closes [#960](https://github.com/clap-rs/clap/issues/960))
*   fixes a bug where positional argument help text is misaligned ([54c16836](https://github.com/clap-rs/clap/commit/54c16836dea4651806a2cfad53146a83fa3abf21))

#### Documentation

* **App::template:**  adds details about the necessity to use AppSettings::UnifiedHelpMessage when using {unified} tags in the help template ([cf569438](https://github.com/clap-rs/clap/commit/cf569438f309c199800bb8e46c9f140187de69d7), closes [#949](https://github.com/clap-rs/clap/issues/949))
* **Arg::allow_hyphen_values:**  updates the docs to include warnings for allow_hyphen_values and multiple(true) used together ([ded5a2f1](https://github.com/clap-rs/clap/commit/ded5a2f15474d4a5bd46a67b130ccb8b6781bd01))
* **clap_app!:**  adds using the @group specifier to the macro docs ([fe85fcb1](https://github.com/clap-rs/clap/commit/fe85fcb1772b61f13b20b7ea5290e2437a76190c), closes [#932](https://github.com/clap-rs/clap/issues/932))



## v2.24.0 (2017-05-07)


#### Bug Fixes

*   fixes a bug where args with last(true) and required(true) set were not being printed in the usage string ([3ac533fe](https://github.com/clap-rs/clap/commit/3ac533fedabf713943eedf006f830a5a486bbe80), closes [#944](https://github.com/clap-rs/clap/issues/944))
*   fixes a bug that was printing the arg name, instead of value name when Arg::last(true) was used ([e1fe8ac3](https://github.com/clap-rs/clap/commit/e1fe8ac3bc1f9cf4e36df0d881f8419755f1787b), closes [#940](https://github.com/clap-rs/clap/issues/940))
*   fixes a bug where flags were parsed as flags AND positional values when specific combinations of settings were used ([20f83292](https://github.com/clap-rs/clap/commit/20f83292d070038b8cee2a6b47e91f6b0a2f7871), closes [#946](https://github.com/clap-rs/clap/issues/946))



## v2.24.0 (2017-05-05)


#### Documentation

* **README.md:**  fix some typos ([fa34deac](https://github.com/clap-rs/clap/commit/fa34deac079f334c3af97bb7fb151880ba8887f8))

#### API Additions

* **Arg:**  add `default_value_os` ([d5ef8955](https://github.com/clap-rs/clap/commit/d5ef8955414b1587060f7218385256105b639c88))
* **arg_matches.rs:**  Added a Default implementation for Values and OsValues iterators. ([0a4384e3](https://github.com/clap-rs/clap/commit/0a4384e350eed74c2a4dc8964c203f21ac64897f))


## v2.23.2 (2017-04-19)


#### Bug Fixes

* **PowerShell Completions:**  fixes a bug where powershells completions cant be used if no subcommands are defined ([a8bce558](https://github.com/clap-rs/clap/commit/a8bce55837dc4e0fb187dc93180884a40ae09c6f), closes [#931](https://github.com/clap-rs/clap/issues/931))

#### Improvements

*   bumps term_size to take advantage of better terminal dimension handling ([e05100b7](https://github.com/clap-rs/clap/commit/e05100b73d74066a90876bf38f952adf5e8ee422))
* **PowerShell Completions:**  massively dedups subcommand names in the generate script to make smaller scripts that are still functionally equiv ([85b0e1cc](https://github.com/clap-rs/clap/commit/85b0e1cc4b9755dda75a93d898d79bc38631552b))

#### Documentation

*   Fix a typo the minimum rust version required ([71dabba3](https://github.com/clap-rs/clap/commit/71dabba3ea0a17c88b0e2199c9d99f0acbf3bc17))

## v2.23.1 (2017-04-05)


#### Bug Fixes

*   fixes a missing newline character in the autogenerated help and version messages in some instances ([5ae9007d](https://github.com/clap-rs/clap/commit/5ae9007d984ae94ae2752df51bcbaeb0ec89bc15))


## v2.23.0 (2017-04-05)


#### API Additions

* `App::long_about`
* `App::long_version`
* `App::print_long_help`
* `App::write_long_help`
* `App::print_long_version`
* `App::write_long_version`
* `Arg::long_help`

#### Features

*   allows distinguishing between short and long version messages (-V/short or --version/long) ([59272b06](https://github.com/clap-rs/clap/commit/59272b06cc213289dc604dbc694cb95d383a5d68))
*   allows distinguishing between short and long help with subcommands in the same manner as args ([6b371891](https://github.com/clap-rs/clap/commit/6b371891a1702173a849d1e95f9fecb168bf6fc4))
*   allows specifying a short help vs a long help (i.e. varying levels of detail depending on if -h or --help was used) ([ef1b24c3](https://github.com/clap-rs/clap/commit/ef1b24c3a0dff2f58c5e2e90880fbc2b69df20ee))
* **clap_app!:**  adds support for arg names with hyphens similar to longs with hyphens ([f7a88779](https://github.com/clap-rs/clap/commit/f7a8877978c8f90e6543d4f0d9600c086cf92cd7), closes [#869](https://github.com/clap-rs/clap/issues/869))

#### Bug Fixes

*   fixes a bug that wasn't allowing help and version to be properly overridden ([8b2ceb83](https://github.com/clap-rs/clap/commit/8b2ceb8368bcb70689fadf1c7f4b9549184926c1), closes [#922](https://github.com/clap-rs/clap/issues/922))

#### Documentation

* **clap_app!:**  documents the `--("some-arg")` method for using args with hyphens inside them ([bc08ef3e](https://github.com/clap-rs/clap/commit/bc08ef3e185393073d969d301989b6319c616c1f), closes [#919](https://github.com/clap-rs/clap/issues/919))



## v2.22.2 (2017-03-30)


#### Bug Fixes

* **Custom Usage Strings:**  fixes the usage string regression when using help templates ([0e4fd96d](https://github.com/clap-rs/clap/commit/0e4fd96d74280d306d09e60ac44f938a82321769))



## v2.22.1 (2017-03-24)


#### Bug Fixes

* **usage:**  fixes a big regression with custom usage strings ([2c41caba](https://github.com/clap-rs/clap/commit/2c41caba3c7d723a2894e315d04da796b0e97759))

## v2.22.0 (2017-03-23)

#### API Additions

* **App::name:**  adds the ability to change the name of the App instance after creation ([d49e8292](https://github.com/clap-rs/clap/commit/d49e8292b026b06e2b70447cd9f08299f4fcba76), closes [#908](https://github.com/clap-rs/clap/issues/908))
* **Arg::hide_default_value:**  adds ability to hide the default value of an argument from the help string ([89e6ea86](https://github.com/clap-rs/clap/commit/89e6ea861e16a1ad56757ca12f6b32d02253e44a), closes [#902](https://github.com/clap-rs/clap/issues/902))


## v2.21.3 (2017-03-23)

#### Bug Fixes

* **yaml:**  adds support for loading author info from yaml ([e04c390c](https://github.com/clap-rs/clap/commit/e04c390c597a55fa27e724050342f16c42f1c5c9))


## v2.21.2 (2017-03-17)


#### Improvements

*   add fish subcommand help support ([f8f68cf8](https://github.com/clap-rs/clap/commit/f8f68cf8251669aef4539a25a7c1166f0ac81ea6))
*   options that use `require_equals(true)` now display the equals sign in help messages, usage strings, and errors" ([c8eb0384](https://github.com/clap-rs/clap/commit/c8eb0384d394d2900ccdc1593099c97808a3fa05), closes [#903](https://github.com/clap-rs/clap/issues/903))


#### Bug Fixes

*  setting the max term width now correctly propagates down through child subcommands



## v2.21.1 (2017-03-12)


#### Bug Fixes

* **ArgRequiredElseHelp:**  fixes the precedence of this error to prioritize over other error messages ([74b751ff](https://github.com/clap-rs/clap/commit/74b751ff2e3631e337b7946347c1119829a41c53), closes [#895](https://github.com/clap-rs/clap/issues/895))
* **Positionals:**  fixes some regression bugs resulting from old asserts in debug mode. ([9a3bc98e](https://github.com/clap-rs/clap/commit/9a3bc98e9b55e7514b74b73374c5ac8b6e5e0508), closes [#896](https://github.com/clap-rs/clap/issues/896))



## v2.21.0 (2017-03-09)

#### Performance

*   doesn't run `arg_post_processing` on multiple values anymore ([ec516182](https://github.com/clap-rs/clap/commit/ec5161828729f6a53f0fccec8648f71697f01f78))
*   changes internal use of `VecMap` to `Vec` for matched values of `Arg`s ([22bf137a](https://github.com/clap-rs/clap/commit/22bf137ac581684c6ed460d2c3c640c503d62621))
*   vastly reduces the amount of cloning when adding non-global args minus when they're added from `App::args` which is forced to clone ([8da0303b](https://github.com/clap-rs/clap/commit/8da0303bc02db5fe047cfc0631a9da41d9dc60f7))
*   refactor to remove unneeded vectors and allocations and checks for significant performance increases ([0efa4119](https://github.com/clap-rs/clap/commit/0efa4119632f134fc5b8b9695b007dd94b76735d))

#### Documentation

*   Fix examples link in CONTRIBUTING.md ([60cf875d](https://github.com/clap-rs/clap/commit/60cf875d67a252e19bb85054be57696fac2c57a1))

#### Improvements

*   when `AppSettings::SubcommandsNegateReqs` and `ArgsNegateSubcommands` are used, a new more accurate double line usage string is shown ([50f02300](https://github.com/clap-rs/clap/commit/50f02300d81788817acefef0697e157e01b6ca32), closes [#871](https://github.com/clap-rs/clap/issues/871))

#### API Additions

* **Arg::last:**  adds the ability to mark a positional argument as 'last' which means it should be used with `--` syntax and can be accessed early ([6a7aea90](https://github.com/clap-rs/clap/commit/6a7aea9043b83badd9ab038b4ecc4c787716147e), closes [#888](https://github.com/clap-rs/clap/issues/888))
*   provides `default_value_os` and `default_value_if[s]_os` ([0f2a3782](https://github.com/clap-rs/clap/commit/0f2a378219a6930748d178ba350fe5925be5dad5), closes [#849](https://github.com/clap-rs/clap/issues/849))
*   provides `App::help_message` and `App::version_message` which allows one to override the auto-generated help/version flag associated help ([389c413](https://github.com/clap-rs/clap/commit/389c413b7023dccab8c76aa00577ea1d048e7a99), closes [#889](https://github.com/clap-rs/clap/issues/889))

#### New Settings

* **InferSubcommands:**  adds a setting to allow one to infer shortened subcommands or aliases (i.e. for subcommmand "test", "t", "te", or "tes" would be allowed assuming no other ambiguities) ([11602032](https://github.com/clap-rs/clap/commit/11602032f6ff05881e3adf130356e37d5e66e8f9), closes [#863](https://github.com/clap-rs/clap/issues/863))

#### Bug Fixes

*   doesn't print the argument sections in the help message if all args in that section are hidden ([ce5ee5f5](https://github.com/clap-rs/clap/commit/ce5ee5f5a76f838104aeddd01c8ec956dd347f50))
*   doesn't include the various [ARGS] [FLAGS] or [OPTIONS] if the only ones available are hidden ([7b4000af](https://github.com/clap-rs/clap/commit/7b4000af97637703645c5fb2ac8bb65bd546b95b), closes [#882](https://github.com/clap-rs/clap/issues/882))
*   now correctly shows subcommand as required in the usage string when AppSettings::SubcommandRequiredElseHelp is used ([8f0884c1](https://github.com/clap-rs/clap/commit/8f0884c1764983a49b45de52a1eddf8d721564d8))
*   fixes some memory leaks when an error is detected and clap exits ([8c2dd287](https://github.com/clap-rs/clap/commit/8c2dd28718262ace4ae0db98563809548e02a86b))
*   fixes a trait that's marked private accidentally, but should be crate internal public ([1ae21108](https://github.com/clap-rs/clap/commit/1ae21108015cea87e5360402e1747025116c7878))
* **Completions:**   fixes a bug that tried to propagate global args multiple times when generating multiple completion scripts ([5e9b9cf4](https://github.com/clap-rs/clap/commit/5e9b9cf4dd80fa66a624374fd04e6545635c1f94), closes [#846](https://github.com/clap-rs/clap/issues/846))

#### Features

* **Options:**  adds the ability to require the equals syntax with options --opt=val ([f002693d](https://github.com/clap-rs/clap/commit/f002693dec6a6959c4e9590cb7b7bfffd6d6e5bc), closes [#833](https://github.com/clap-rs/clap/issues/833))



## v2.20.5 (2017-02-18)


#### Bug Fixes

* **clap_app!:**   fixes a critical bug of a missing fragment specifier when using `!property` style tags. ([5635c1f94](https://github.com/clap-rs/clap/commit/5e9b9cf4dd80fa66a624374fd04e6545635c1f94))


## v2.20.4 (2017-02-15)


#### Bug Fixes

* **Completions:**   fixes a bug that tried to propagate global args multiple times when generating multiple completion scripts ([5e9b9cf4](https://github.com/clap-rs/clap/commit/5e9b9cf4dd80fa66a624374fd04e6545635c1f94), closes [#846](https://github.com/clap-rs/clap/issues/846))

#### Documentation

*   Fix examples link in CONTRIBUTING.md ([60cf875d](https://github.com/clap-rs/clap/commit/60cf875d67a252e19bb85054be57696fac2c57a1))


## v2.20.3 (2017-02-03)


#### Documentation

* **Macros:**  adds a warning about changing values in Cargo.toml not triggering a rebuild automatically ([112aea3e](https://github.com/clap-rs/clap/commit/112aea3e42ae9e0c0a2d33ebad89496dbdd95e5d), closes [#838](https://github.com/clap-rs/clap/issues/838))

#### Bug Fixes

*   fixes a println->debugln typo ([279aa62e](https://github.com/clap-rs/clap/commit/279aa62eaf08f56ce090ba16b937bc763cbb45be))
*   fixes bash completions for commands that have an underscore in the name ([7f5cfa72](https://github.com/clap-rs/clap/commit/7f5cfa724f0ac4e098f5fe466c903febddb2d994), closes [#581](https://github.com/clap-rs/clap/issues/581))
*   fixes a bug where ZSH completions would panic if the binary name had an underscore in it ([891a2a00](https://github.com/clap-rs/clap/commit/891a2a006f775e92c556dda48bb32fac9807c4fb), closes [#581](https://github.com/clap-rs/clap/issues/581))
*   allow final word to be wrapped in wrap_help ([564c5f0f](https://github.com/clap-rs/clap/commit/564c5f0f1730f4a2c1cdd128664f1a981c31dcd4), closes [#828](https://github.com/clap-rs/clap/issues/828))
* fixes a bug where global args weren't included in the generated completion scripts ([9a1e006e](https://github.com/clap-rs/clap/commit/9a1e006eb75ad5a6057ebd119aa90f7e06c0ace8), closes [#841](https://github.com/clap-rs/clap/issues/841))



## v2.20.2 (2017-02-03)

#### Bug Fixes

*   fixes a critical bug where subcommand settings were being propagated too far ([74648c94](https://github.com/clap-rs/clap/commit/74648c94b893df542bfa5bb595e68c7bb8167e36), closes [#832](https://github.com/clap-rs/clap/issues/832))


#### Improvements

*   adds ArgGroup::multiple to the supported YAML fields for building ArgGroups from YAML ([d8590037](https://github.com/clap-rs/clap/commit/d8590037ce07dafd8cd5b26928aa4a9fd3018288), closes [#840](https://github.com/clap-rs/clap/issues/840))

## v2.20.1 (2017-01-31)

#### Bug Fixes

*   allow final word to be wrapped in wrap_help ([564c5f0f](https://github.com/clap-rs/clap/commit/564c5f0f1730f4a2c1cdd128664f1a981c31dcd4), closes [#828](https://github.com/clap-rs/clap/issues/828))
*   actually show character in debug output ([84d8c547](https://github.com/clap-rs/clap/commit/84d8c5476de95b7f37d61888bc4f13688b712434))
*   include final character in line length ([aff4ba18](https://github.com/clap-rs/clap/commit/aff4ba18da8147e1259b04b0bfbc1fcb5c78a3c0))

#### Improvements

*   updates libc and term_size deps for the libc version conflict ([6802ac4a](https://github.com/clap-rs/clap/commit/6802ac4a59c142cda9ec55ca0c45ae5cb9a6ab55))

#### Documentation

*   fix link from app_from_crate! to crate_authors! (#822) ([5b29be9b](https://github.com/clap-rs/clap/commit/5b29be9b073330ab1f7227cdd19fe4aab39d5dcb))
*   fix spelling of "guaranteed" ([4f30a65b](https://github.com/clap-rs/clap/commit/4f30a65b9c03eb09607eb91a929a6396637dc105))


#### New Settings

* **ArgsNegateSubcommands:**  disables args being allowed between subcommands ([5e2af8c9](https://github.com/clap-rs/clap/commit/5e2af8c96adb5ab75fa2d1536237ebcb41869494), closes [#793](https://github.com/clap-rs/clap/issues/793))
* **DontCollapseArgsInUsage:** disables the collapsing of positional args into `[ARGS]` in the usage string  ([c2978afc](https://github.com/clap-rs/clap/commit/c2978afc61fb46d5263ab3b2d87ecde1c9ce1553), closes [#769](https://github.com/clap-rs/clap/issues/769))
* **DisableHelpSubcommand:**  disables building the `help` subcommand  ([a10fc859](https://github.com/clap-rs/clap/commit/a10fc859ee20159fbd9ff4337be59b76467a64f2))
* **AllowMissingPositional:**  allows one to implement `$ prog [optional] <required>` style CLIs where the second positional argument is required, but the first is optional ([1110fdc7](https://github.com/clap-rs/clap/commit/1110fdc7a345c108820dc45783a9bf893fa4c214), closes [#636](https://github.com/clap-rs/clap/issues/636))
* **PropagateGlobalValuesDown:**  automatically propagats global arg's values down through *used* subcommands ([985536c8](https://github.com/clap-rs/clap/commit/985536c8ebcc09af98aac835f42a8072ad58c262), closes [#694](https://github.com/clap-rs/clap/issues/694))

#### API Additions

##### Arg

* **Arg::value_terminator:**  adds the ability to terminate multiple values with a given string or char ([be64ce0c](https://github.com/clap-rs/clap/commit/be64ce0c373efc106384baca3f487ea99fe7b8cf), closes [#782](https://github.com/clap-rs/clap/issues/782))
* **Arg::default_value_if[s]:**  adds new methods for *conditional* default values (such as a particular value from another argument was used) ([eb4010e7](https://github.com/clap-rs/clap/commit/eb4010e7b21724447ef837db11ac441915728f22))
* **Arg::requires_if[s]:**  adds the ability to *conditionally* require additional args (such as if a particular value was used) ([198449d6](https://github.com/clap-rs/clap/commit/198449d64393c265f0bc327aaeac23ec4bb97226))
* **Arg::required_if[s]:**  adds the ability for an arg to be *conditionally* required (i.e. "arg X is only required if arg Y was used with value Z") ([ee9cfddf](https://github.com/clap-rs/clap/commit/ee9cfddf345a6b5ae2af42ba72aa5c89e2ca7f59))
* **Arg::validator_os:**  adds ability to validate values which may contain invalid UTF-8 ([47232498](https://github.com/clap-rs/clap/commit/47232498a813db4f3366ccd3e9faf0bff56433a4))

##### Macros

* **crate_description!:** Uses the `Cargo.toml` description field to fill in the `App::about` method at compile time ([4d9a82db](https://github.com/clap-rs/clap/commit/4d9a82db8e875e9b64a9c2a5c6e22c25afc1279d), closes [#778](https://github.com/clap-rs/clap/issues/778))
* **crate_name!:** Uses the `Cargo.toml` name field to fill in the `App::new` method at compile time ([4d9a82db](https://github.com/clap-rs/clap/commit/4d9a82db8e875e9b64a9c2a5c6e22c25afc1279d), closes [#778](https://github.com/clap-rs/clap/issues/778))
* **app_from_crate!:** Combines `crate_version!`, `crate_name!`, `crate_description!`, and `crate_authors!` into a single macro call to build a default `App` instance from the `Cargo.toml` fields ([4d9a82db](https://github.com/clap-rs/clap/commit/4d9a82db8e875e9b64a9c2a5c6e22c25afc1279d), closes [#778](https://github.com/clap-rs/clap/issues/778))


#### Features

* **no_cargo:**  adds a `no_cargo` feature to disable Cargo-env-var-dependent macros for those *not* using `cargo` to build their crates (#786) ([6fdd2f9d](https://github.com/clap-rs/clap/commit/6fdd2f9d693aaf1118fc61bd362273950703f43d))

#### Bug Fixes

* **Options:**  fixes a critical bug where options weren't forced to have a value ([5a5f2b1e](https://github.com/clap-rs/clap/commit/5a5f2b1e9f598a0d0280ef3e98abbbba2bc41132), closes [#665](https://github.com/clap-rs/clap/issues/665))
*   fixes a bug where calling the help of a subcommand wasn't ignoring required args of parent commands ([d3d34a2b](https://github.com/clap-rs/clap/commit/d3d34a2b51ef31004055b0ab574f766d801c3adf), closes [#789](https://github.com/clap-rs/clap/issues/789))
* **Help Subcommand:**  fixes a bug where the help subcommand couldn't be overridden ([d34ec3e0](https://github.com/clap-rs/clap/commit/d34ec3e032d03e402d8e87af9b2942fe2819b2da), closes [#787](https://github.com/clap-rs/clap/issues/787))
* **Low Index Multiples:**  fixes a bug which caused combinations of LowIndexMultiples and `Arg::allow_hyphen_values` to fail parsing ([26c670ca](https://github.com/clap-rs/clap/commit/26c670ca16d2c80dc26d5c1ce83380ace6357318))

#### Improvements

* **Default Values:**  improves the error message when default values are involved ([1f33de54](https://github.com/clap-rs/clap/commit/1f33de545036e7fd2f80faba251fca009bd519b8), closes [#774](https://github.com/clap-rs/clap/issues/774))
* **YAML:**  adds conditional requirements and conditional default values to YAML ([9a4df327](https://github.com/clap-rs/clap/commit/9a4df327893486adb5558ffefba790c634ccdc6e), closes [#764](https://github.com/clap-rs/clap/issues/764))
*  Support `--("some-arg-name")` syntax for defining long arg names when using `clap_app!` macro ([f41ec962](https://github.com/clap-rs/clap/commit/f41ec962c243a5ffff8b1be1ae2ad63970d3d1d4))
*  Support `("some app name")` syntax for defining app names when using `clap_app!` macro ([9895b671](https://github.com/clap-rs/clap/commit/9895b671cff784f35cf56abcd8270f7c2ba09699), closes [#759](https://github.com/clap-rs/clap/issues/759))
* **Help Wrapping:**  long app names (with spaces), authors, and descriptions are now wrapped appropriately ([ad4691b7](https://github.com/clap-rs/clap/commit/ad4691b71a63e951ace346318238d8834e04ad8a), closes [#777](https://github.com/clap-rs/clap/issues/777))


#### Documentation

* **Conditional Default Values:**  fixes the failing doc tests of Arg::default_value_ifs ([4ef09101](https://github.com/clap-rs/clap/commit/4ef091019c083b4db1a0c13f1c1e95ac363259f2))
* **Conditional Requirements:**  adds docs for Arg::requires_ifs ([7f296e29](https://github.com/clap-rs/clap/commit/7f296e29db7d9036e76e5dbcc9c8b20dfe7b25bd))
* **README.md:**  fix some typos ([f22c21b4](https://github.com/clap-rs/clap/commit/f22c21b422d5b287d1a1ac183a379ee02eebf54f))
* **src/app/mod.rs:**  fix some typos ([5c9b0d47](https://github.com/clap-rs/clap/commit/5c9b0d47ca78dea285c5b9dec79063d24c3e451a))

## v2.19.3 (2016-12-28)


#### Bug Fixes

*   fixes a bug where calling the help of a subcommand wasn't ignoring required args of parent commands ([a0ee4993](https://github.com/clap-rs/clap/commit/a0ee4993015ea97b06b5bc9f378d8bcb18f1c51c), closes [#789](https://github.com/clap-rs/clap/issues/789))



## v2.19.2 (2016-12-08)

#### Bug Fixes

* **ZSH Completions:**  escapes square brackets in ZSH completions ([7e17d5a3](https://github.com/clap-rs/clap/commit/7e17d5a36b2cc2cc77e7b15796b14d639ed3cbf7), closes [#771](https://github.com/clap-rs/clap/issues/771))

#### Documentation

* **Examples:**  adds subcommand examples ([0e0f3354](https://github.com/clap-rs/clap/commit/0e0f33547a6901425afc1d9fbe19f7ae3832d9a4), closes [#766](https://github.com/clap-rs/clap/issues/766))
* **README.md:**  adds guidance on when to use ~ in version pinning, and clarifies breaking change policy ([591eaefc](https://github.com/clap-rs/clap/commit/591eaefc7319142ba921130e502bb0729feed907), closes [#765](https://github.com/clap-rs/clap/issues/765))



## v2.19.1 (2016-12-01)


#### Bug Fixes

* **Help Messages:**  fixes help message alignment when specific settings are used on options ([cd94b318](https://github.com/clap-rs/clap/commit/cd94b3188d63b63295a319e90e826bca46befcd2), closes [#760](https://github.com/clap-rs/clap/issues/760))

#### Improvements

* **Bash Completion:**  allows bash completion to fall back to traditional bash completion upon no matching completing function ([b1b16d56](https://github.com/clap-rs/clap/commit/b1b16d56d8fddf819bdbe24b3724bb6a9f3fa613)))


## v2.19.0 (2016-11-21)

#### Features

*   allows specifying AllowLeadingHyphen style values, but only for specific args vice command wide ([c0d70feb](https://github.com/clap-rs/clap/commit/c0d70febad9996a77a54107054daf1914c50d4ef), closes [#742](https://github.com/clap-rs/clap/issues/742))

#### Bug Fixes

* **Required Unless:**  fixes a bug where having required_unless set doesn't work when conflicts are also set ([d20331b6](https://github.com/clap-rs/clap/commit/d20331b6f7940ac3a4e919999f8bb4780875125d), closes [#753](https://github.com/clap-rs/clap/issues/753))
* **ZSH Completions:**  fixes an issue where zsh completions caused panics if there were no subcommands ([49e7cdab](https://github.com/clap-rs/clap/commit/49e7cdab76dd1ccc07221e360f07808ec62648aa), closes [#754](https://github.com/clap-rs/clap/issues/754))

#### Improvements

* **Validators:**  improves the error messages for validators ([65eb3385](https://github.com/clap-rs/clap/commit/65eb33859d3ff53e7d3277f02a9d3fd9038a9dfb), closes [#744](https://github.com/clap-rs/clap/issues/744))

#### Documentation

*   updates the docs landing page ([01e1e33f](https://github.com/clap-rs/clap/commit/01e1e33f377934099a4a725fab5cd6c5ff50eaa2))
*   adds the macro version back to the readme ([45eb9bf1](https://github.com/clap-rs/clap/commit/45eb9bf130329c3f3853aba0342c2fe3c64ff80f))
*   fix broken docs links ([808e7cee](https://github.com/clap-rs/clap/commit/808e7ceeb86d4a319bdc270f51c23a64621dbfb3))
* **Compatibility Policy:**  adds an official compatibility policy to ([760d66dc](https://github.com/clap-rs/clap/commit/760d66dc17310b357f257776624151da933cd25d), closes [#740](https://github.com/clap-rs/clap/issues/740))
* **Contributing:**  updates the readme to improve the readability and contributing sections ([eb51316c](https://github.com/clap-rs/clap/commit/eb51316cdfdc7258d287ba13b67ef2f42bd2b8f6))

## v2.18.0 (2016-11-05)


#### Features

* **Completions:**  adds completion support for PowerShell. ([cff82c88](https://github.com/clap-rs/clap/commit/cff82c880e21064fca63351507b80350df6caadf), closes [#729](https://github.com/clap-rs/clap/issues/729))



## v2.17.1 (2016-11-02)


#### Bug Fixes

* **Low Index Multiples:**  fixes a bug where using low index multiples was propagated to subcommands ([33924e88](https://github.com/clap-rs/clap/commit/33924e884461983c4e6b5ea1330fecc769a4ade7), closes [#725](https://github.com/clap-rs/clap/issues/725))



## v2.17.0 (2016-11-01)


#### Features

* **Positional Args:**  allows specifying the second to last positional argument as multiple(true) ([1ced2a74](https://github.com/clap-rs/clap/commit/1ced2a7433ea8937a1b260ea65d708f32ca7c95e), closes [#725](https://github.com/clap-rs/clap/issues/725))



## v2.16.4 (2016-10-31)


#### Improvements

* **Error Output:**  conflicting errors are now symmetrical, meaning more consistent and less confusing ([3d37001d](https://github.com/clap-rs/clap/commit/3d37001d1dc647d73cc597ff172f1072d4beb80d), closes [#718](https://github.com/clap-rs/clap/issues/718))

#### Documentation

*   Fix typo in example `13a_enum_values_automatic` ([c22fbc07](https://github.com/clap-rs/clap/commit/c22fbc07356e556ffb5d1a79ec04597d149b915e))
* **README.md:**  fixes failing yaml example (#715) ([21fba9e6](https://github.com/clap-rs/clap/commit/21fba9e6cd8c163012999cd0ce271ec8780c5695))

#### Bug Fixes

* **ZSH Completions:**  fixes bug that caused panic on subcommands with aliases ([5c70e1a0](https://github.com/clap-rs/clap/commit/5c70e1a01bc977e44c10015d18bb8e215c32dfc8), closes [#714](https://github.com/clap-rs/clap/issues/714))
* **debug:**  fixes the debug feature (#716) ([6c11ccf4](https://github.com/clap-rs/clap/commit/6c11ccf443d46258d51f7cda33fbcc81e7fe8e90))



## v2.16.3 (2016-10-28)


#### Bug Fixes

*   Derive display order after propagation ([9cb6facf](https://github.com/clap-rs/clap/commit/9cb6facf507aff7cddd124b8c29714d2b0e7bd13), closes [#706](https://github.com/clap-rs/clap/issues/706))
* **yaml-example:**  inconsistent args ([847f7199](https://github.com/clap-rs/clap/commit/847f7199219ead5065561d91d64780d99ae4b587))



## v2.16.2 (2016-10-25)


#### Bug Fixes

* **Fish Completions:**  fixes a bug where single quotes are not escaped ([780b4a18](https://github.com/clap-rs/clap/commit/780b4a18281b6f7f7071e1b9db2290fae653c406), closes [#704](https://github.com/clap-rs/clap/issues/704))


## v2.16.1 (2016-10-24)


#### Bug Fixes

* **Help Message:**  fixes a regression bug where args with multiple(true) threw off alignment ([ebddac79](https://github.com/clap-rs/clap/commit/ebddac791f3ceac193d5ad833b4b734b9643a7af), closes [#702](https://github.com/clap-rs/clap/issues/702))



## v2.16.0 (2016-10-23)


#### Features

* **Completions:**  adds ZSH completion support ([3e36b0ba](https://github.com/clap-rs/clap/commit/3e36b0bac491d3f6194aee14604caf7be26b3d56), closes [#699](https://github.com/clap-rs/clap/issues/699))



## v2.15.0 (2016-10-21)


#### Features

* **AppSettings:**  adds new setting `AppSettings::AllowNegativeNumbers` ([ab064546](https://github.com/clap-rs/clap/commit/ab06454677fb6aa9b9f804644fcca2168b1eaee3), closes [#696](https://github.com/clap-rs/clap/issues/696))

#### Documentation

* **app/settings.rs:**  moves variants to roughly alphabetical order ([9ed4d4d7](https://github.com/clap-rs/clap/commit/9ed4d4d7957a23357aef60081e45639ab9e3905f))


## v2.14.1 (2016-10-20)


#### Documentation

*   Improve documentation around features ([4ee85b95](https://github.com/clap-rs/clap/commit/4ee85b95d2d16708a016a3ba4e6e2c93b89b7fad))
*   reword docs for ErrorKind and app::Settings ([3ccde7a4](https://github.com/clap-rs/clap/commit/3ccde7a4b8f7a2ea8b916a5415c04a8ff4b5cb7a))
*   fix tests that fail when the "suggestions" feature is disabled ([996fc381](https://github.com/clap-rs/clap/commit/996fc381763a48d125c7ea8a58fed057fd0b4ac6))
*   fix the OsString-using doc-tests ([af9e1a39](https://github.com/clap-rs/clap/commit/af9e1a393ce6cdda46a03c8a4f48df222b015a24))
*   tag non-rust code blocks as such instead of ignoring them ([0ba9f4b1](https://github.com/clap-rs/clap/commit/0ba9f4b123f281952581b6dec948f7e51dd22890))
* **ErrorKind:**  improve some errors about subcommands ([9f6217a4](https://github.com/clap-rs/clap/commit/9f6217a424da823343d7b801b9c350dee3cd1906))
* **yaml:**  make sure the doc-tests don't fail before "missing file" ([8c0f5551](https://github.com/clap-rs/clap/commit/8c0f55516f4910c78c9f8a2bdbd822729574f95b))

#### Improvements

*   Stabilize clap_app! ([cd516006](https://github.com/clap-rs/clap/commit/cd516006e35c37b005f329338560a0a53d1f3e00))
* **with_defaults:**  Deprecate App::with_defaults() ([26085409](https://github.com/clap-rs/clap/commit/2608540940c8bb66e517b65706bc7dea55510682), closes [#638](https://github.com/clap-rs/clap/issues/638))

#### Bug Fixes

*   fixes a bug that made determining when to auto-wrap long help messages inconsistent ([468baadb](https://github.com/clap-rs/clap/commit/468baadb8398fc1d37897b0c49374aef4cf97dca), closes [#688](https://github.com/clap-rs/clap/issues/688))
* **Completions:**  fish completions for nested subcommands ([a61eaf8a](https://github.com/clap-rs/clap/commit/a61eaf8aade76cfe90ccc0f7125751ebf60e3254))
* **features:**  Make lints not enable other nightly-requiring features ([835f75e3](https://github.com/clap-rs/clap/commit/835f75e3ba20999117363ed9f916464d777f36ef))



## v2.14.0 (2016-10-05)


#### Features

* **arg_aliases:**  Ability to alias arguments ([33b5f6ef](https://github.com/clap-rs/clap/commit/33b5f6ef2c9612ecabb31f96b824793e46bfd3dd), closes [#669](https://github.com/clap-rs/clap/issues/669))
* **flag_aliases:**  Ability to alias flags ([40d6dac9](https://github.com/clap-rs/clap/commit/40d6dac973927dded6ab423481634ef47ee7bfd7))

#### Bug Fixes

* **UsageParser:**  Handle non-ascii names / options. ([1d6a7c6e](https://github.com/clap-rs/clap/commit/1d6a7c6e7e6aadc527346aa822f19d8587f714f3), closes [#664](https://github.com/clap-rs/clap/issues/664))

#### Documentation

*   typo ([bac417fa](https://github.com/clap-rs/clap/commit/bac417fa1cea3d32308334c7cccfcf54546cd9d8))


## v2.13.0 (2016-09-18)


#### Documentation

*   updates README.md with new website information and updated video tutorials info ([0c19c580](https://github.com/clap-rs/clap/commit/0c19c580cf50f1b82ff32f70b36708ae2bcac132))
*   updates the docs about removing implicit value_delimiter(true) ([c81bc722](https://github.com/clap-rs/clap/commit/c81bc722ebb8a86d22be89b5aec98df9fe222a08))
* **Default Values:**  adds better examples on using default values ([57a8d9ab](https://github.com/clap-rs/clap/commit/57a8d9abb2f973c235a8a14f8fc031673d7a7460), closes [#418](https://github.com/clap-rs/clap/issues/418))

#### Bug Fixes

* **Value Delimiters:**  fixes the confusion around implicitly setting value delimiters. (default is now `false`) ([09d4d0a9](https://github.com/clap-rs/clap/commit/09d4d0a9038d7ce2df55c2aec95e16f36189fcee), closes [#666](https://github.com/clap-rs/clap/issues/666))



## v2.12.1 (2016-09-13)


#### Bug Fixes

* **Help Wrapping:**  fixes a regression-bug where the old {n} newline char stopped working ([92ac353b](https://github.com/clap-rs/clap/commit/92ac353b48b7caa2511ad2a046d94da93c236cf6), closes [#661](https://github.com/clap-rs/clap/issues/661))



## v2.12.0 (2016-09-13)


#### Features

* **Help:**  adds ability to hide the possible values on a per argument basis ([9151ef73](https://github.com/clap-rs/clap/commit/9151ef739871f2e74910c342299c0de196b95dec), closes [#640](https://github.com/clap-rs/clap/issues/640))
* **help:**  allow for limiting detected terminal width ([a43e28af](https://github.com/clap-rs/clap/commit/a43e28af85c9a9deaedd5ef735f4f13008daab29), closes [#653](https://github.com/clap-rs/clap/issues/653))

#### Documentation

* **Help Wrapping:**  removes the verbage about using `'{n}'` to insert newlines in help text ([c5a2b352](https://github.com/clap-rs/clap/commit/c5a2b352ca600f5b802290ad945731066cd53611))
* **Value Delimiters:**  updates the docs for the Arg::multiple method WRT value delimiters and default settings ([f9d17a06](https://github.com/clap-rs/clap/commit/f9d17a060aa53f10d0a6e1a7eed5d989d1a59533))
* **appsettings:**  Document AppSetting::DisableVersion ([94501965](https://github.com/clap-rs/clap/commit/945019654d2ca67eb2b1d6014fdf80b84d528d30), closes [#589](https://github.com/clap-rs/clap/issues/589))

#### Bug Fixes

* **AllowLeadingHyphen:**  fixes a bug where valid args aren't recognized with this setting ([a9699e4d](https://github.com/clap-rs/clap/commit/a9699e4d7cdc9a06e73b845933ff1fe6d76f016a), closes [#588](https://github.com/clap-rs/clap/issues/588))

#### Improvements

* **Help Wrapping:**
  *  clap now ignores hard newlines in help messages and properly re-aligns text, but still wraps if the term width is too small ([c7678523](https://github.com/clap-rs/clap/commit/c76785239fd42adc8ca04f9202b6fec615aa9f14), closes [#617](https://github.com/clap-rs/clap/issues/617))
  *  makes some minor changes to when next line help is automatically used ([01cae799](https://github.com/clap-rs/clap/commit/01cae7990a33167ac35103fb36c811b4fe6eb98f))
* **Value Delimiters:**  changes the default value delimiter rules ([f9e69254](https://github.com/clap-rs/clap/commit/f9e692548e8c94de15f909432de301407d6bb834), closes [#655](https://github.com/clap-rs/clap/issues/655))
* **YAML:**  supports setting Arg::require_delimiter from YAML ([b9b55a39](https://github.com/clap-rs/clap/commit/b9b55a39dfebcdbdc05dca2692927e503db50816))

#### Performance

* **help:**  fix redundant contains() checks ([a8afed74](https://github.com/clap-rs/clap/commit/a8afed7428bf0733f8e93bb11ad6c00d9e970fcc))



## v2.11.3 (2016-09-07)


#### Documentation

* **Help Wrapping:**  removes the verbage about using `'{n}'` to insert newlines in help text ([c5a2b352](https://github.com/clap-rs/clap/commit/c5a2b352ca600f5b802290ad945731066cd53611))

#### Improvements

* **Help Wrapping:**
  *  clap now ignores hard newlines in help messages and properly re-aligns text, but still wraps if the term width is too small ([c7678523](https://github.com/clap-rs/clap/commit/c76785239fd42adc8ca04f9202b6fec615aa9f14), closes [#617](https://github.com/clap-rs/clap/issues/617))
  *  makes some minor changes to when next line help is automatically used ([01cae799](https://github.com/clap-rs/clap/commit/01cae7990a33167ac35103fb36c811b4fe6eb98f))
* **YAML:**  supports setting Arg::require_delimiter from YAML ([b9b55a39](https://github.com/clap-rs/clap/commit/b9b55a39dfebcdbdc05dca2692927e503db50816))




## v2.11.2 (2016-09-06)

#### Improvements

* **Help Wrapping:**  makes some minor changes to when next line help is automatically used ([5658b117](https://github.com/clap-rs/clap/commit/5658b117aec3e03adff9c8c52a4c4bc1fcb4e1ff))


## v2.11.1 (2016-09-05)


#### Bug Fixes

* **Settings:**  fixes an issue where settings weren't propagated down through grandchild subcommands ([b3efc107](https://github.com/clap-rs/clap/commit/b3efc107515d78517b20798ff3890b8a2b04498e), closes [#638](https://github.com/clap-rs/clap/issues/638))

#### Features

* **Errors:**  Errors with custom description ([58512f2f](https://github.com/clap-rs/clap/commit/58512f2fcb430745f1ee6ee8f1c67f62dc216c73))

#### Improvements

* **help:**  use term_size instead of home-grown solution ([fc7327e9](https://github.com/clap-rs/clap/commit/fc7327e9dcf4258ef2baebf0a8714d9c0622855b))



## v2.11.0 (2016-08-28)


#### Bug Fixes

* **Groups:**  fixes some usage strings that contain both args in groups and ones that conflict with each other ([3d782def](https://github.com/clap-rs/clap/commit/3d782def57725e2de26ca5a5bc5cc2e40ddebefb), closes [#616](https://github.com/clap-rs/clap/issues/616))

#### Documentation

*   moves docs to docs.rs ([03209d5e](https://github.com/clap-rs/clap/commit/03209d5e1300906f00bafec1869c2047a92e5071), closes [#634](https://github.com/clap-rs/clap/issues/634))

#### Improvements

* **Completions:**  uses standard conventions for bash completion files, namely '{bin}.bash-completion' ([27f5bbfb](https://github.com/clap-rs/clap/commit/27f5bbfbcc9474c2f57c2b92b1feb898ae46ee70), closes [#567](https://github.com/clap-rs/clap/issues/567))
* **Help:**  automatically moves help text to the next line and wraps when term width is determined to be too small, or help text is too long ([150964c4](https://github.com/clap-rs/clap/commit/150964c4e7124d54476c9d9b4b3f2406f0fd00e5), closes [#597](https://github.com/clap-rs/clap/issues/597))
* **YAML Errors:**  vastly improves error messages when using YAML ([f43b7c65](https://github.com/clap-rs/clap/commit/f43b7c65941c53adc0616b8646a21dc255862eb2), closes [#574](https://github.com/clap-rs/clap/issues/574))

#### Features

*   adds App::with_defaults to automatically use crate_authors! and crate_version! macros ([5520bb01](https://github.com/clap-rs/clap/commit/5520bb012c127dfd299fd55699443c744d8dcd5b), closes [#600](https://github.com/clap-rs/clap/issues/600))



## v2.10.4 (2016-08-25)


#### Bug Fixes

* **Help Wrapping:**  fixes a bug where help is wrapped incorrectly and causing a panic with some non-English characters ([d0b442c7](https://github.com/clap-rs/clap/commit/d0b442c7beeecac9764406bc3bd171ced0b8825e), closes [#626](https://github.com/clap-rs/clap/issues/626))



## v2.10.3 (2016-08-25)

#### Features

* **Help:**  adds new short hand way to use source formatting and ignore term width in help messages ([7dfdaf20](https://github.com/clap-rs/clap/commit/7dfdaf200ebb5c431351a045b48f5e0f0d3f31db), closes [#625](https://github.com/clap-rs/clap/issues/625))

#### Documentation

* **Term Width:**  adds details about set_term_width(0) ([00b8205d](https://github.com/clap-rs/clap/commit/00b8205d22639d1b54b9c453c55c785aace52cb2))

#### Bug Fixes

* **Unicode:**  fixes two bugs where non-English characters were stripped or caused a panic with help wrapping ([763a5c92](https://github.com/clap-rs/clap/commit/763a5c920e23efc74d190af0cb8b5dd714b2d67a), closes [#626](https://github.com/clap-rs/clap/issues/626))



## v2.10.2 (2016-08-22)


#### Bug Fixes

*   fixes a bug where the help is printed twice ([a643fb28](https://github.com/clap-rs/clap/commit/a643fb283acd9905dc727c4579c5c9fa2ceaa7e7), closes [#623](https://github.com/clap-rs/clap/issues/623))



## v2.10.1 (2016-08-21)


#### Bug Fixes

* **Help Subcommand:**  fixes misleading usage string when using multi-level subcommmands ([e203515e](https://github.com/clap-rs/clap/commit/e203515e3ac495b405dbba4f78fb6af148fd282e), closes [#618](https://github.com/clap-rs/clap/issues/618))

#### Features

* **YAML:**  allows using lists or single values with arg declarations ([9ade2cd4](https://github.com/clap-rs/clap/commit/9ade2cd4b268d6d7fe828319ce6a523c641b9c38), closes [#614](https://github.com/clap-rs/clap/issues/614), [#613](https://github.com/clap-rs/clap/issues/613))



## v2.10.0 (2016-07-29)


#### Features

* **Completions:**  one can generate a basic fish completions script at compile time ([1979d2f2](https://github.com/clap-rs/clap/commit/1979d2f2f3216e57d02a97e624a8a8f6cf867ed9))

#### Bug Fixes

* **parser:**  preserve external subcommand name ([875df243](https://github.com/clap-rs/clap/commit/875df24316c266920a073c13bbefbf546bc1f635))

#### Breaking Changes

* **parser:**  preserve external subcommand name ([875df243](https://github.com/clap-rs/clap/commit/875df24316c266920a073c13bbefbf546bc1f635))

#### Documentation

* **YAML:**  fixes example 17's incorrect reference to arg_groups instead of groups ([b6c99e13](https://github.com/clap-rs/clap/commit/b6c99e1377f918e78c16c8faced70a71607da931), closes [#601](https://github.com/clap-rs/clap/issues/601))



### 2.9.3 (2016-07-24)


#### Bug Fixes

*   fixes bug where only first arg in list of required_unless_one is recognized ([1fc3b55b](https://github.com/clap-rs/clap/commit/1fc3b55bd6c8653b02e7c4253749c6b77737d2ac), closes [#575](https://github.com/clap-rs/clap/issues/575))
* **Settings:**  fixes typo subcommandsrequired->subcommandrequired ([fc72cdf5](https://github.com/clap-rs/clap/commit/fc72cdf591d30f5d9375d0b5cc2a2ff3e812f9f6), closes [#593](https://github.com/clap-rs/clap/issues/593))

#### Features

* **Completions:**  adds the ability to generate completions to io::Write object ([9f62cf73](https://github.com/clap-rs/clap/commit/9f62cf7378ba5acb5ce8c5bac89b4aa60c30755f))
* **Settings:**  Add unset_setting and unset_settings fns to App (#598) ([0ceba231](https://github.com/clap-rs/clap/commit/0ceba231c6767cd6d88fdb1feeeea41deadf77ff), closes [#590](https://github.com/clap-rs/clap/issues/590))


### 2.9.2 (2016-07-03)


#### Documentation

* **Completions:**  fixes the formatting of the Cargo.toml excerpt in the completions example ([722f2607](https://github.com/clap-rs/clap/commit/722f2607beaef56b6a0e433db5fd09492d9f028c))

#### Bug Fixes

* **Completions:**  fixes bug where --help and --version short weren't added to the completion list ([e9f2438e](https://github.com/clap-rs/clap/commit/e9f2438e2ce99af0ae570a2eaf541fc7f55b771b), closes [#536](https://github.com/clap-rs/clap/issues/536))



### 2.9.1 (2016-07-02)


#### Improvements

* **Completions:**  allows multiple completions to be built by namespacing with bin name ([57484b2d](https://github.com/clap-rs/clap/commit/57484b2daeaac01c1026e8c84efc8bf099e0eb31))


## v2.9.0 (2016-07-01)


#### Documentation

* **Completions:**
  *  fixes some errors in the completion docs ([9b359bf0](https://github.com/clap-rs/clap/commit/9b359bf06255d3dad8f489308044b60a9d1e6a87))
  *  adds documentation for completion scripts ([c6c519e4](https://github.com/clap-rs/clap/commit/c6c519e40efd6c4533a9ef5efe8e74fd150391b7))

#### Features

* **Completions:**
  *  one can now generate a bash completions script at compile time! ([e75b6c7b](https://github.com/clap-rs/clap/commit/e75b6c7b75f729afb9eb1d2a2faf61dca7674634), closes [#376](https://github.com/clap-rs/clap/issues/376))
  *  completions now include aliases to subcommands, including all subcommand options ([0ab9f840](https://github.com/clap-rs/clap/commit/0ab9f84052a8cf65b5551657f46c0c270841e634), closes [#556](https://github.com/clap-rs/clap/issues/556))
  *  completions now continue completing even after first completion ([18fc2e5b](https://github.com/clap-rs/clap/commit/18fc2e5b5af63bf54a94b72cec5e1223d49f4806))
  *  allows matching on possible values in options ([89cc2026](https://github.com/clap-rs/clap/commit/89cc2026ba9ac69cf44c5254360bbf99236d4f89), closes [#557](https://github.com/clap-rs/clap/issues/557))

#### Bug Fixes

* **AllowLeadingHyphen:**  fixes an issue where  isn't ignored like it should be with this setting ([96c24c9a](https://github.com/clap-rs/clap/commit/96c24c9a8fa1f85e06138d3cdd133e51659e19d2), closes [#558](https://github.com/clap-rs/clap/issues/558))

## v2.8.0 (2016-06-30)


#### Features

* **Arg:**  adds new setting `Arg::require_delimiter` which requires val delimiter to parse multiple values ([920b5595](https://github.com/clap-rs/clap/commit/920b5595ed72abfb501ce054ab536067d8df2a66))

#### Bug Fixes

*   Declare term::Winsize as repr(C) ([5d663d90](https://github.com/clap-rs/clap/commit/5d663d905c9829ce6e7a164f1f0896cdd70236dd))

#### Documentation

* **Arg:**  adds docs for ([49af4e38](https://github.com/clap-rs/clap/commit/49af4e38a5dae2ab0a7fc3b4147e2c053d532484))



## v2.7.1 (2016-06-29)


#### Bug Fixes

* **Options:**
  *  options with multiple values and using delimiters no longer parse additional values after a trailing space ([cdc500bd](https://github.com/clap-rs/clap/commit/cdc500bdde6abe238c36ade406ddafc2bafff583))
  *  using options with multiple values and with an = no longer parse args after the trailing space as values ([290f61d0](https://github.com/clap-rs/clap/commit/290f61d07177413cf082ada55526d83405f6d011))



## v2.7.0 (2016-06-28)


#### Documentation

*   fix typos ([43b3d40b](https://github.com/clap-rs/clap/commit/43b3d40b8c38b1571da75af86b5088be96cccec2))
* **ArgGroup:**  vastly improves ArgGroup docs by adding better examples ([9e5f4f5d](https://github.com/clap-rs/clap/commit/9e5f4f5d734d630bca5535c3a0aa4fd4f9db3e39), closes [#534](https://github.com/clap-rs/clap/issues/534))

#### Features

* **ArgGroup:**  one can now specify groups which require AT LEAST one of the args ([33689acc](https://github.com/clap-rs/clap/commit/33689acc689b217a8c0ee439f1b1225590c38355), closes [#533](https://github.com/clap-rs/clap/issues/533))

#### Bug Fixes

* **App:**  using `App::print_help` now prints the same as would have been printed by `--help` or the like ([e84cc018](https://github.com/clap-rs/clap/commit/e84cc01836bbe0527e97de6db9889bd9e0fd6ba1), closes [#536](https://github.com/clap-rs/clap/issues/536))
* **Help:**
  *  prevents invoking <cmd> help help and displaying incorrect help message ([e3d2893f](https://github.com/clap-rs/clap/commit/e3d2893f377942a2d4cf3c6ff04524d0346e6fdb), closes [#538](https://github.com/clap-rs/clap/issues/538))
  *  subcommand help messages requested via <cmd> help <sub> now correctly match <cmd> <sub> --help ([08ad1cff](https://github.com/clap-rs/clap/commit/08ad1cff4fec57224ea957a2891a057b323c01bc), closes [#539](https://github.com/clap-rs/clap/issues/539))

#### Improvements

* **ArgGroup:**  Add multiple ArgGroups per Arg ([902e182f](https://github.com/clap-rs/clap/commit/902e182f7a58aff11ff01e0a452abcdbdb2262aa), closes [#426](https://github.com/clap-rs/clap/issues/426))
* **Usage Strings:**  `[FLAGS]` and `[ARGS]` are no longer blindly added to usage strings ([9b2e45b1](https://github.com/clap-rs/clap/commit/9b2e45b170aff567b038d8b3368880b6046c10c6), closes [#537](https://github.com/clap-rs/clap/issues/537))
* **arg_enum!:**  allows using meta items like repr(C) with arg_enum!s ([edf9b233](https://github.com/clap-rs/clap/commit/edf9b2331c17a2cbcc13f961add4c55c2778e773), closes [#543](https://github.com/clap-rs/clap/issues/543))



## v2.6.0 (2016-06-14)


#### Improvements

*   removes extra newline from help output ([86e61d19](https://github.com/clap-rs/clap/commit/86e61d19a748fb9870fcf1175308984e51ca1115))
*   allows printing version to any io::Write object ([921f5f79](https://github.com/clap-rs/clap/commit/921f5f7916597f1d028cd4a65bfe76a01c801724))
*   removes extra newline when printing version ([7e2e2cbb](https://github.com/clap-rs/clap/commit/7e2e2cbb4a8a0f050bb8072a376f742fc54b8589))
* **Aliases:**  improves readability of asliases in help messages ([ca511de7](https://github.com/clap-rs/clap/commit/ca511de71f5b8c2ac419f1b188658e8c63b67846), closes [#526](https://github.com/clap-rs/clap/issues/526), [#529](https://github.com/clap-rs/clap/issues/529))
* **Usage Strings:**  improves the default usage string when only a single positional arg is present ([ec86f2da](https://github.com/clap-rs/clap/commit/ec86f2dada1545a63fc72355e22fcdc4c466c215), closes [#518](https://github.com/clap-rs/clap/issues/518))

#### Features

* **Help:**  allows wrapping at specified term width (Even on Windows!) ([1761dc0d](https://github.com/clap-rs/clap/commit/1761dc0d27d0d621229d792be40c36fbf65c3014), closes [#451](https://github.com/clap-rs/clap/issues/451))
* **Settings:**
  *  adds new setting to stop delimiting values with -- or TrailingVarArg ([fc3e0f5a](https://github.com/clap-rs/clap/commit/fc3e0f5afda6d24cdb3c4676614beebe13e1e870), closes [#511](https://github.com/clap-rs/clap/issues/511))
  *  one can now set an AppSetting which is propagated down through child subcommands ([e2341835](https://github.com/clap-rs/clap/commit/e23418351a3b98bf08dfd7744bc14377c70d59ee), closes [#519](https://github.com/clap-rs/clap/issues/519))
* **Subcommands:**  adds support for visible aliases ([7b10e7f8](https://github.com/clap-rs/clap/commit/7b10e7f8937a07fdb8d16a6d8df79ce78d080cd3), closes [#522](https://github.com/clap-rs/clap/issues/522))

#### Bug Fixes

*   fixes bug where args are printed out of order with templates ([05abb534](https://github.com/clap-rs/clap/commit/05abb534864764102031a0d402e64ac65867aa87))
*   fixes bug where one can't override version or help flags ([90d7d6a2](https://github.com/clap-rs/clap/commit/90d7d6a2ea8240122dd9bf8d82d3c4f5ebb5c703), closes [#514](https://github.com/clap-rs/clap/issues/514))
*   fixes issue where before_help wasn't printed ([b3faff60](https://github.com/clap-rs/clap/commit/b3faff6030f76a23f26afcfa6a90169002ed7106))
* **Help:**  `App::before_help` and `App::after_help` now correctly wrap ([1f4da767](https://github.com/clap-rs/clap/commit/1f4da7676e6e71aa8dda799f3eeefad105a47819), closes [#516](https://github.com/clap-rs/clap/issues/516))
* **Settings:**  fixes bug where new color settings couldn't be converted from strs ([706a7c11](https://github.com/clap-rs/clap/commit/706a7c11b0900be594de6d5a3121938eff197602))
* **Subcommands:**  subcommands with aliases now display help of the aliased subcommand ([5354d14b](https://github.com/clap-rs/clap/commit/5354d14b51f189885ba110e01e6b76cca3752992), closes [#521](https://github.com/clap-rs/clap/issues/521))
* **Windows:**  fixes a failing windows build ([01e7dfd6](https://github.com/clap-rs/clap/commit/01e7dfd6c07228c0be6695b3c7bf9370d82860d4))
* **YAML:**  adds missing YAML methods for App and Arg ([e468faf3](https://github.com/clap-rs/clap/commit/e468faf3f05950fd9f72d84b69aa2061e91c6c64), closes [#528](https://github.com/clap-rs/clap/issues/528))



## v2.5.2 (2016-05-31)


#### Improvements

*   removes extra newline from help output ([86e61d19](https://github.com/clap-rs/clap/commit/86e61d19a748fb9870fcf1175308984e51ca1115))
*   allows printing version to any io::Write object ([921f5f79](https://github.com/clap-rs/clap/commit/921f5f7916597f1d028cd4a65bfe76a01c801724))
*   removes extra newline when printing version ([7e2e2cbb](https://github.com/clap-rs/clap/commit/7e2e2cbb4a8a0f050bb8072a376f742fc54b8589))

#### Bug Fixes

*   fixes bug where args are printed out of order with templates ([3935431d](https://github.com/clap-rs/clap/commit/3935431d5633f577c0826ae2142794b301f4b8ca))
*   fixes bug where one can't override version or help flags ([90d7d6a2](https://github.com/clap-rs/clap/commit/90d7d6a2ea8240122dd9bf8d82d3c4f5ebb5c703), closes [#514](https://github.com/clap-rs/clap/issues/514))
*   fixes issue where before_help wasn't printed ([b3faff60](https://github.com/clap-rs/clap/commit/b3faff6030f76a23f26afcfa6a90169002ed7106))

#### Documentation

*   inter-links all types and pages ([3312893d](https://github.com/clap-rs/clap/commit/3312893ddaef3f44d68d8d26ed3d08010be50d97), closes [#505](https://github.com/clap-rs/clap/issues/505))
*   makes all publicly available types viewable in docs ([52ca6505](https://github.com/clap-rs/clap/commit/52ca6505b4fec7b5c2d53d160c072d395eb21da6))

## v2.5.1 (2016-05-11)


#### Bug Fixes

* **Subcommand Aliases**: fixes lifetime issue when setting multiple aliases at once ([ac42f6cf0](https://github.com/clap-rs/clap/commit/ac42f6cf0de6c4920f703807d63061803930b18d))

## v2.5.0 (2016-05-10)


#### Improvements

* **SubCommand Aliases:**  adds feature to yaml configs too ([69592195](https://github.com/clap-rs/clap/commit/695921954dde46dfd483399dcdef482c9dd7f34a))

#### Features

* **SubCommands:**  adds support for subcommand aliases ([66b4dea6](https://github.com/clap-rs/clap/commit/66b4dea65c44d8f77ff522238a9237aed1bcab6d), closes [#469](https://github.com/clap-rs/clap/issues/469))


## v2.4.3 (2016-05-10)


#### Bug Fixes

* **Usage Strings:**
  *  now properly dedups args that are also in groups ([3ca0947c](https://github.com/clap-rs/clap/commit/3ca0947c166b4f8525752255e3a4fa6565eb9689), closes [#498](https://github.com/clap-rs/clap/issues/498))
  *  removes duplicate groups from usage strings ([f574fb8a](https://github.com/clap-rs/clap/commit/f574fb8a7cde4d4a2fa4c4481d59be2d0f135427))

#### Improvements

* **Groups:**  formats positional args in groups in a better way ([fef11154](https://github.com/clap-rs/clap/commit/fef11154fb7430d1cbf04a672aabb366e456a368))
* **Help:**
  *  moves positionals to standard <> formatting ([03dfe5ce](https://github.com/clap-rs/clap/commit/03dfe5ceff1d63f172788ff688567ddad9fe119b))
  *  default help subcommand string has been shortened ([5b7fe8e4](https://github.com/clap-rs/clap/commit/5b7fe8e4161e43ab19e2e5fcf55fbe46791134e9), closes [#494](https://github.com/clap-rs/clap/issues/494))

## v2.4.3 (2016-05-10)

* Ghost Release

## v2.4.3 (2016-05-10)

* Ghost Release

## v2.4.0 (2016-05-02)


#### Features

* **Help:**  adds support for displaying info before help message ([29fbfa3b](https://github.com/clap-rs/clap/commit/29fbfa3b963f2f3ca7704bf5d3e1201531baa373))
* **Required:**  adds allowing args that are required unless certain args are present ([af1f7916](https://github.com/clap-rs/clap/commit/af1f79168390ea7da4074d0d9777de458ea64971))

#### Documentation

*   hides formatting from docs ([cb708093](https://github.com/clap-rs/clap/commit/cb708093a7cd057f08c98b7bd1ed54c2db86ae7e))
* **required_unless:**  adds docs and examples for required_unless ([ca727b52](https://github.com/clap-rs/clap/commit/ca727b52423b9883acd88b2f227b2711bc144573))

#### Bug Fixes

* **Required Args:**  fixes issue where missing required args are sometimes duplicated in error messages ([3beebd81](https://github.com/clap-rs/clap/commit/3beebd81e7bc2faa4115ac109cf570e512c5477f), closes [#492](https://github.com/clap-rs/clap/issues/492))


## v2.3.0 (2016-04-18)


#### Improvements

* **macros.rs:**  Added write_nspaces macro (a new version of write_spaces) ([9d757e86](https://github.com/clap-rs/clap/commit/9d757e8678e334e5a740ac750c76a9ed4e785cba))
* **parser.rs:**
  *  Provide a way to create a usage string without the USAGE: title ([a91d378b](https://github.com/clap-rs/clap/commit/a91d378ba0c91b5796457f8c6e881b13226ab735))
  *  Make Parser's create_usage public allowing to have function outside the parser to generate the help ([d51945f8](https://github.com/clap-rs/clap/commit/d51945f8b82ebb0963f4f40b384a9e8335783091))
  *  Expose Parser's flags, opts and positionals argument as iterators ([9b23e7ee](https://github.com/clap-rs/clap/commit/9b23e7ee40e51f7a823644c4496be955dc6c9d3a))
* **src/args:**  Exposes argument display order by introducing a new Trait ([1321630e](https://github.com/clap-rs/clap/commit/1321630ef56955f152c73376d4d85cceb0bb4a12))
* **srs/args:**  Added longest_filter to AnyArg trait ([65b3f667](https://github.com/clap-rs/clap/commit/65b3f667532685f854c699ddd264d326599cf7e5))

#### Features

* **Authors Macro:**  adds a crate_authors macro ([38fb59ab](https://github.com/clap-rs/clap/commit/38fb59abf480eb2b6feca269097412f8b00b5b54), closes [#447](https://github.com/clap-rs/clap/issues/447))
* **HELP:**
  *  implements optional colored help messages ([abc8f669](https://github.com/clap-rs/clap/commit/abc8f669c3c8193ffc3a3b0ac6c3ac2198794d4f), closes [#483](https://github.com/clap-rs/clap/issues/483))
  *  Add a Templated Help system. ([81e121ed](https://github.com/clap-rs/clap/commit/81e121edd616f7285593f11120c63bcccae0d23e))

#### Bug Fixes

* **HELP:**  Adjust Help to semantic changes introduced in 6933b84 ([8d23806b](https://github.com/clap-rs/clap/commit/8d23806bd67530ad412c34a1dcdcb1435555573d))

## v2.2.6 (2016-04-11)

#### Bug Fixes

* **Arg Groups**: fixes bug where arg name isn't printed properly ([3019a685](https://github.com/clap-rs/clap/commit/3019a685eee747ccbe6be09ad5dddce0b1d1d4db), closes [#476](https://github.com/clap-rs/clap/issues/476))


## v2.2.5 (2016-04-03)


#### Bug Fixes

* **Empty Values:**  fixes bug where empty values weren't stored ([885d166f](https://github.com/clap-rs/clap/commit/885d166f04eb3fb581898ae5818c6c8032e5a686), closes [#470](https://github.com/clap-rs/clap/issues/470))
* **Help Message:**  fixes bug where arg name is printed twice ([71acf1d5](https://github.com/clap-rs/clap/commit/71acf1d576946658b8bbdb5ae79e6716c43a030f), closes [#472](https://github.com/clap-rs/clap/issues/472))


## v2.2.4 (2016-03-30)


#### Bug Fixes

*   fixes compiling with debug cargo feature ([d4b55450](https://github.com/clap-rs/clap/commit/d4b554509928031ac0808076178075bb21f8c1da))
* **Empty Values:**  fixes bug where empty values weren't stored ([885d166f](https://github.com/clap-rs/clap/commit/885d166f04eb3fb581898ae5818c6c8032e5a686), closes [#470](https://github.com/clap-rs/clap/issues/470))



## v2.2.3 (2016-03-28)


#### Bug Fixes

* **Help Subcommand:**  fixes issue where help and version flags weren't properly displayed ([205b07bf](https://github.com/clap-rs/clap/commit/205b07bf2e6547851f1290f8cd6b169145e144f1), closes [#466](https://github.com/clap-rs/clap/issues/466))

## v2.2.2 (2016-03-27)


#### Bug Fixes

* **Help Message:**  fixes bug with wrapping in the middle of a unicode sequence ([05365ddc](https://github.com/clap-rs/clap/commit/05365ddcc252e4b49e7a75e199d6001a430bd84d), closes [#456](https://github.com/clap-rs/clap/issues/456))
* **Usage Strings:**  fixes small bug where -- would appear needlessly in usage strings ([6933b849](https://github.com/clap-rs/clap/commit/6933b8491c2a7e28cdb61b47dcf10caf33c2f78a), closes [#461](https://github.com/clap-rs/clap/issues/461))


### 2.2.1 (2016-03-16)


#### Features

* **Help Message:**  wraps and aligns the help message of subcommands ([813d75d0](https://github.com/clap-rs/clap/commit/813d75d06fbf077c65762608c0fa5e941cfc393c), closes [#452](https://github.com/clap-rs/clap/issues/452))

#### Bug Fixes

* **Help Message:**  fixes a bug where small terminal sizes causing a loop ([1d73b035](https://github.com/clap-rs/clap/commit/1d73b0355236923aeaf6799abc759762ded7e1d0), closes [#453](https://github.com/clap-rs/clap/issues/453))


## v2.2.0 (2016-03-15)


#### Features

* **Help Message:**  can auto wrap and aligning help text to term width ([e36af026](https://github.com/clap-rs/clap/commit/e36af0266635f23e85e951b9088d561e9a5d1bf6), closes [#428](https://github.com/clap-rs/clap/issues/428))
* **Help Subcommand:**  adds support passing additional subcommands to help subcommand ([2c12757b](https://github.com/clap-rs/clap/commit/2c12757bbdf34ce481f3446c074e24c09c2e60fd), closes [#416](https://github.com/clap-rs/clap/issues/416))
* **Opts and Flags:**  adds support for custom ordering in help messages ([9803b51e](https://github.com/clap-rs/clap/commit/9803b51e799904c0befaac457418ee766ccc1ab9))
* **Settings:**  adds support for automatically deriving custom display order of args ([ad86e433](https://github.com/clap-rs/clap/commit/ad86e43334c4f70e86909689a088fb87e26ff95a), closes [#444](https://github.com/clap-rs/clap/issues/444))
* **Subcommands:**  adds support for custom ordering in help messages ([7d2a2ed4](https://github.com/clap-rs/clap/commit/7d2a2ed413f5517d45988eef0765cdcd663b6372), closes [#442](https://github.com/clap-rs/clap/issues/442))

#### Bug Fixes

* **From Usage:**  fixes a bug where adding empty lines weren't ignored ([c5c58c86](https://github.com/clap-rs/clap/commit/c5c58c86b9c503d8de19da356a5a5cffb59fbe84))

#### Documentation

* **Groups:**  explains required ArgGroups better ([4ff0205b](https://github.com/clap-rs/clap/commit/4ff0205b85a45151b59bbaf090a89df13438380f), closes [#439](https://github.com/clap-rs/clap/issues/439))

## v2.1.2 (2016-02-24)

#### Bug Fixes

* **Nightly:**  fixes failing nightly build ([d752c170](https://github.com/clap-rs/clap/commit/d752c17029598b19037710f204b7943f0830ae75), closes [#434](https://github.com/clap-rs/clap/issues/434))


## v2.1.1 (2016-02-19)


#### Documentation

* **AppSettings:**  clarifies that AppSettings do not propagate ([3c8db0e9](https://github.com/clap-rs/clap/commit/3c8db0e9be1d24edaad364359513cbb02abb4186), closes [#429](https://github.com/clap-rs/clap/issues/429))
* **Arg Examples:**  adds better examples ([1e79cccc](https://github.com/clap-rs/clap/commit/1e79cccc12937bc0e7cd2aad8e404410798e9fff))

#### Improvements

* **Help:**  adds setting for next line help by arg ([066df748](https://github.com/clap-rs/clap/commit/066df7486e684cf50a8479a356a12ba972c34ce1), closes [#427](https://github.com/clap-rs/clap/issues/427))


## v2.1.0 (2016-02-10)


#### Features

* **Default Values:**  adds support for default values in args ([73211952](https://github.com/clap-rs/clap/commit/73211952964a79d97b434dd567e6d7d34be7feb5), closes [#418](https://github.com/clap-rs/clap/issues/418))

#### Documentation

* **Default Values:**  adds better examples and notes for default values ([9facd74f](https://github.com/clap-rs/clap/commit/9facd74f843ef3807c5d35259558a344e6c25905))


## v2.0.6 (2016-02-09)


#### Improvements

* **Positional Arguments:**  now displays value name if appropriate ([f0a99916](https://github.com/clap-rs/clap/commit/f0a99916c59ce675515c6dcdfe9a40b130510908), closes [#420](https://github.com/clap-rs/clap/issues/420))


## v2.0.5 (2016-02-05)


#### Bug Fixes

* **Multiple Values:**  fixes bug where number_of_values wasn't respected ([72c387da](https://github.com/clap-rs/clap/commit/72c387da0bb8a6f526f863770f08bb8ca0d3de03))


## v2.0.4 (2016-02-04)


#### Bug Fixes

*   adds support for building ArgGroups from standalone YAML ([fcbc7e12](https://github.com/clap-rs/clap/commit/fcbc7e12f5d7b023b8f30cba8cad28a01cf6cd26))
*   Stop lonely hyphens from causing panic ([85b11468](https://github.com/clap-rs/clap/commit/85b11468b0189d5cc15f1cfac5db40d17a0077dc), closes [#410](https://github.com/clap-rs/clap/issues/410))
* **AppSettings:**  fixes bug where subcmds didn't receive parent ver ([a62e4527](https://github.com/clap-rs/clap/commit/a62e452754b3b0e3ac9a15aa8b5330636229ead1))

## v2.0.3 (2016-02-02)


#### Improvements

* **values:**  adds support for up to u64::max values per arg ([c7abf7d7](https://github.com/clap-rs/clap/commit/c7abf7d7611e317b0d31d97632e3d2e13570947c))
* **occurrences:**  Allow for more than 256 occurrences of an argument. ([3731ddb3](https://github.com/clap-rs/clap/commit/3731ddb361163f3d6b86844362871e48c80fa530))

#### Features

* **AppSettings:**  adds HidePossibleValuesInHelp to skip writing those values ([cdee7a0e](https://github.com/clap-rs/clap/commit/cdee7a0eb2beeec723cb98acfacf03bf629c1da3))

#### Bug Fixes

* **value_t_or_exit:**  fixes typo which causes value_t_or_exit to return a Result ([ee96baff](https://github.com/clap-rs/clap/commit/ee96baffd306cb8d20ddc5575cf739bb1a6354e8))


## v2.0.2 (2016-01-31)


#### Improvements

* **arg_enum:**  enum declared with arg_enum returns [&'static str; #] instead of Vec ([9c4b8a1a](https://github.com/clap-rs/clap/commit/9c4b8a1a6b12949222f17d1074578ad7676b9c0d))

#### Bug Fixes

*   clap_app! should be gated by unstable, not nightly feature ([0c8b84af](https://github.com/clap-rs/clap/commit/0c8b84af6161d5baf683688eafc00874846f83fa))
* **SubCommands:**  fixed where subcmds weren't recognized after mult args ([c19c17a8](https://github.com/clap-rs/clap/commit/c19c17a8850602990e24347aeb4427cf43316223), closes [#405](https://github.com/clap-rs/clap/issues/405))
* **Usage Parser:**  fixes a bug where literal single quotes weren't allowed in help strings ([0bcc7120](https://github.com/clap-rs/clap/commit/0bcc71206478074769e311479b34a9f74fe80f5c), closes [#406](https://github.com/clap-rs/clap/issues/406))


## v2.0.1 (2016-01-30)


#### Bug Fixes

*   fixes cargo features to NOT require nightly with unstable features ([dcbcc60c](https://github.com/clap-rs/clap/commit/dcbcc60c9ba17894be636472ea4b07a82d86a9db), closes [#402](https://github.com/clap-rs/clap/issues/402))


## v2.0.0 (2016-01-28)


#### Improvements

* **From Usage:**  vastly improves the usage parser ([fa3a2f86](https://github.com/clap-rs/clap/commit/fa3a2f86bd674c5eb07128c95098fab7d1437247), closes [#350](https://github.com/clap-rs/clap/issues/350))

#### Features

*   adds support for external subcommands ([177fe5cc](https://github.com/clap-rs/clap/commit/177fe5cce745c2164a8e38c23be4c4460d2d7211), closes [#372](https://github.com/clap-rs/clap/issues/372))
*   adds support values with a leading hyphen ([e4d429b9](https://github.com/clap-rs/clap/commit/e4d429b9d52e95197bd0b572d59efacecf305a59), closes [#385](https://github.com/clap-rs/clap/issues/385))
*   adds support for turning off the value delimiter ([508db850](https://github.com/clap-rs/clap/commit/508db850a87c2e251cf6b6ddead9ad56b29f9e57), closes [#352](https://github.com/clap-rs/clap/issues/352))
*   adds support changing the value delimiter ([dafeae8a](https://github.com/clap-rs/clap/commit/dafeae8a526162640f6a68da434370c64d190889), closes [#353](https://github.com/clap-rs/clap/issues/353))
*   adds support for comma separated values ([e69da6af](https://github.com/clap-rs/clap/commit/e69da6afcd2fe48a3c458ca031db40997f860eda), closes [#348](https://github.com/clap-rs/clap/issues/348))
*   adds support with options with optional values ([4555736c](https://github.com/clap-rs/clap/commit/4555736cad01441dcde4ea84a285227e0844c16e), closes [#367](https://github.com/clap-rs/clap/issues/367))
* **UTF-8:**  adds support for invalid utf8 in values ([c5c59dec](https://github.com/clap-rs/clap/commit/c5c59dec0bc33b86b2e99d30741336f17ec84282), closes [#269](https://github.com/clap-rs/clap/issues/269))
* **v2:**  implementing the base of 2.x ([a3536054](https://github.com/clap-rs/clap/commit/a3536054512ba833533dc56615ce3663d884381c))

#### Bug Fixes

*   fixes nightly build with new lints ([17599195](https://github.com/clap-rs/clap/commit/175991956c37dc83ba9c49396e927a1cb65c5b11))
*   fixes Windows build for 2x release ([674c9b48](https://github.com/clap-rs/clap/commit/674c9b48c7c92079cb180cc650a9e39f34781c32), closes [#392](https://github.com/clap-rs/clap/issues/392))
*   fixes yaml build for 2x base ([adceae64](https://github.com/clap-rs/clap/commit/adceae64c8556d00ab715677377b216f9f468ad7))

#### Documentation

*   updates examples for 2x release ([1303b360](https://github.com/clap-rs/clap/commit/1303b3607468f362ab1b452d5614c1a064dc69b4), closes [#394](https://github.com/clap-rs/clap/issues/394))
*   updates examples for 2x release ([0a011f31](https://github.com/clap-rs/clap/commit/0a011f3142aec338d388a6c8bfe22fa7036021bb), closes [#394](https://github.com/clap-rs/clap/issues/394))
*   updates documentation for v2 release ([8d51724e](https://github.com/clap-rs/clap/commit/8d51724ef73dfde5bb94fb9466bc5463a1cc1502))
*   updating docs for 2x release ([576d0e0e](https://github.com/clap-rs/clap/commit/576d0e0e2c7b8f386589179bbf7419b93abacf1c))
* **README.md:**
  *  updates readme for v2 release ([acaba01a](https://github.com/clap-rs/clap/commit/acaba01a353c12144b9cd9a3ce447400691849b0), closes [#393](https://github.com/clap-rs/clap/issues/393))
  *  fix typo and make documentation conspicuous ([07b9f614](https://github.com/clap-rs/clap/commit/07b9f61495d927f69f7abe6c0d85253f0f4e6107))

#### BREAKING CHANGES

* **Fewer lifetimes! Yay!**
 * `App<'a, 'b, 'c, 'd, 'e, 'f>` => `App<'a, 'b>`
 * `Arg<'a, 'b, 'c, 'd, 'e, 'f>` => `Arg<'a, 'b>`
 * `ArgMatches<'a, 'b>` => `ArgMatches<'a>`
* **Simply Renamed**
 * `App::arg_group` => `App::group`
 * `App::arg_groups` => `App::groups`
 * `ArgGroup::add` => `ArgGroup::arg`
 * `ArgGroup::add_all` => `ArgGroup::args`
 * `ClapError` => `Error`
  * struct field `ClapError::error_type` => `Error::kind`
 * `ClapResult` => `Result`
 * `ClapErrorType` => `ErrorKind`
* **Removed Deprecated Functions and Methods**
 * `App::subcommands_negate_reqs`
 * `App::subcommand_required`
 * `App::arg_required_else_help`
 * `App::global_version(bool)`
 * `App::versionless_subcommands`
 * `App::unified_help_messages`
 * `App::wait_on_error`
 * `App::subcommand_required_else_help`
 * `SubCommand::new`
 * `App::error_on_no_subcommand`
 * `Arg::new`
 * `Arg::mutually_excludes`
 * `Arg::mutually_excludes_all`
 * `Arg::mutually_overrides_with`
 * `simple_enum!`
* **Renamed Error Variants**
 * `InvalidUnicode` => `InvalidUtf8`
 * `InvalidArgument` => `UnknownArgument`
* **Usage Parser**
 * Value names can now be specified inline, i.e. `-o, --option <FILE> <FILE2> 'some option which takes two files'`
 * **There is now a priority of order to determine the name** - This is perhaps the biggest breaking change. See the documentation for full details. Prior to this change, the value name took precedence. **Ensure your args are using the proper names (i.e. typically the long or short and NOT the value name) throughout the code**
* `ArgMatches::values_of` returns an `Values` now which implements `Iterator` (should not break any code)
* `crate_version!` returns `&'static str` instead of `String`
* Using the `clap_app!` macro requires compiling with the `unstable` feature because the syntax could change slightly in the future


## v1.5.5 (2016-01-04)


#### Bug Fixes

*   fixes an issue where invalid short args didn't cause an error ([c9bf7e44](https://github.com/clap-rs/clap/commit/c9bf7e4440bd2f9b524ea955311d433c40a7d1e0))
*   prints the name in version and help instead of binary name ([8f3817f6](https://github.com/clap-rs/clap/commit/8f3817f665c0cab6726bc16c56a53b6a61e44448), closes [#368](https://github.com/clap-rs/clap/issues/368))
*   fixes an intentional panic issue discovered via clippy ([ea83a3d4](https://github.com/clap-rs/clap/commit/ea83a3d421ea8856d4cac763942834d108b71406))


## v1.5.4 (2015-12-18)


#### Examples

* **17_yaml:**  conditinonally compile 17_yaml example ([575de089](https://github.com/clap-rs/clap/commit/575de089a3e240c398cb10e6cf5a5c6b68662c01))

#### Improvements

*   clippy improvements ([99cdebc2](https://github.com/clap-rs/clap/commit/99cdebc23da3a45a165f14b27bebeb2ed828a2ce))

#### Bug Fixes


* **errors:**  return correct error type in WrongNumValues error builder ([5ba8ba9d](https://github.com/clap-rs/clap/commit/5ba8ba9dcccdfa74dd1c44260e64b359bbb36be6))
*   ArgRequiredElseHelp setting now takes precedence over missing required args ([faad83fb](https://github.com/clap-rs/clap/commit/faad83fbef6752f3093b6e98fca09a9449b830f4), closes [#362](https://github.com/clap-rs/clap/issues/362))


## v1.5.3 (2015-11-20)


#### Bug Fixes

* **Errors:**  fixes some instances when errors are missing a final newline ([c4d2b171](https://github.com/clap-rs/clap/commit/c4d2b1711994479ad64ee52b6b49d2ceccbf2118))




## v1.5.2 (2015-11-14)


#### Bug Fixes

* **Errors:**  fixes a compiling bug when built on Windows or without the color feature ([a35f7634](https://github.com/clap-rs/clap/commit/a35f76346fe6ecc88dda6a1eb13627186e7ce185))



## v1.5.1 (2015-11-13)


#### Bug Fixes

* **Required Args:**  fixes a bug where required args are not correctly accounted for ([f03b88a9](https://github.com/clap-rs/clap/commit/f03b88a9766b331a63879bcd747687f2e5a2661b), closes [#343](https://github.com/clap-rs/clap/issues/343))



## v1.5.0 (2015-11-13)


#### Bug Fixes

*   fixes a bug with required positional args in usage strings ([c6858f78](https://github.com/clap-rs/clap/commit/c6858f78755f8e860204323c828c8355a066dc83))

#### Documentation

* **FAQ:**  updates readme with slight changes to FAQ ([a4ef0fab](https://github.com/clap-rs/clap/commit/a4ef0fab73c8dc68f1b138965d1340459c113398))

#### Improvements

*   massive errors overhaul ([cdc29175](https://github.com/clap-rs/clap/commit/cdc29175bc9c53e5b4aec86cbc04c1743154dae6))
* **ArgMatcher:**  huge refactor and deduplication of code ([8988853f](https://github.com/clap-rs/clap/commit/8988853fb8825e8f841fde349834cc12cdbad081))
* **Errors:**  errors have been vastly improved ([e59bc0c1](https://github.com/clap-rs/clap/commit/e59bc0c16046db156a88ba71a037db05028e995c))
* **Traits:**  refactoring some configuration into traits ([5800cdec](https://github.com/clap-rs/clap/commit/5800cdec6dce3def4242b9f7bd136308afb19685))

#### Performance

* **App:**
  *  more BTreeMap->Vec, Opts and SubCmds ([bc4495b3](https://github.com/clap-rs/clap/commit/bc4495b32ec752b6c4b29719e831c043ef2a26ce))
  *  changes flags BTreeMap->Vec ([d357640f](https://github.com/clap-rs/clap/commit/d357640fab55e5964fe83efc3c771e53aa3222fd))
  *  removed unneeded BTreeMap ([78971fd6](https://github.com/clap-rs/clap/commit/78971fd68d7dc5c8e6811b4520cdc54e4188f733))
  *  changes BTreeMap to VecMap in some instances ([64b921d0](https://github.com/clap-rs/clap/commit/64b921d087fdd03775c95ba0bcf65d3f5d36f812))
  *  removed excess clones ([ec0089d4](https://github.com/clap-rs/clap/commit/ec0089d42ed715d293fb668d3a90b0db0aa3ec39))



## v1.4.7 (2015-11-03)


#### Documentation

*   Clarify behavior of Arg::multiple with options. ([434f497a](https://github.com/clap-rs/clap/commit/434f497ab6d831f8145cf09278c97ca6ee6c6fe7))
*   Fix typos and improve grammar. ([c1f66b5d](https://github.com/clap-rs/clap/commit/c1f66b5de7b5269fbf8760a005ef8c645edd3229))

#### Bug Fixes

* **Error Status:**  fixes bug where --help and --version return non-zero exit code ([89b51fdf](https://github.com/clap-rs/clap/commit/89b51fdf8b1ab67607567344e2317ff1a757cb12))



## v1.4.6 (2015-10-29)


#### Features

*   allows parsing without a binary name for daemons and interactive CLIs ([aff89d57](https://github.com/clap-rs/clap/commit/aff89d579b5b85c3dc81b64f16d5865299ec39a2), closes [#318](https://github.com/clap-rs/clap/issues/318))

#### Bug Fixes

* **Errors:**  tones down quoting in some error messages ([34ce59ed](https://github.com/clap-rs/clap/commit/34ce59ede53bfa2eef722c74881cdba7419fd9c7), closes [#309](https://github.com/clap-rs/clap/issues/309))
* **Help and Version:**  only builds help and version once ([e3be87cf](https://github.com/clap-rs/clap/commit/e3be87cfc095fc41c9811adcdc6d2b079f237d5e))
* **Option Args:**  fixes bug with args and multiple values ([c9a9548a](https://github.com/clap-rs/clap/commit/c9a9548a8f96cef8a3dd9a980948325fbbc1b91b), closes [#323](https://github.com/clap-rs/clap/issues/323))
* **POSIX Overrides:**  fixes bug where required args are overridden ([40ed2b50](https://github.com/clap-rs/clap/commit/40ed2b50c3a9fe88bfdbaa43cef9fd6493ecaa8e))
* **Safe Matches:**  using 'safe' forms of the get_matches family no longer exit the process ([c47025dc](https://github.com/clap-rs/clap/commit/c47025dca2b3305dea0a0acfdd741b09af0c0d05), closes [#256](https://github.com/clap-rs/clap/issues/256))
* **Versionless SubCommands:**  fixes a bug where the -V flag was needlessly built ([27df8b9d](https://github.com/clap-rs/clap/commit/27df8b9d98d13709dad3929a009f40ebff089a1a), closes [#329](https://github.com/clap-rs/clap/issues/329))

#### Documentation

*   adds comparison in readme ([1a8bf31e](https://github.com/clap-rs/clap/commit/1a8bf31e7a6b87ce48a66af2cde1645b2dd5bc95), closes [#325](https://github.com/clap-rs/clap/issues/325))



## v1.4.5 (2015-10-06)


#### Bug Fixes

*   fixes crash on invalid arg error ([c78ce128](https://github.com/clap-rs/clap/commit/c78ce128ebbe7b8f730815f8176c29d76f4ade8c))



## v1.4.4 (2015-10-06)


#### Documentation

*   clean up some formatting ([b7df92d7](https://github.com/clap-rs/clap/commit/b7df92d7ea25835701dd22ddff984b9749f48a00))
*   move the crate-level docs to top of the lib.rs file ([d7233bf1](https://github.com/clap-rs/clap/commit/d7233bf122dbf80ba8fc79e5641be2df8af10e7a))
*   changes doc comments to rustdoc comments ([34b601be](https://github.com/clap-rs/clap/commit/34b601be5fdde76c1a0859385b359b96d66b8732))
*   fixes panic in 14_groups example ([945b00a0](https://github.com/clap-rs/clap/commit/945b00a0c27714b63bdca48d003fe205fcfdc578), closes [#295](https://github.com/clap-rs/clap/issues/295))
*   avoid suggesting star dependencies. ([d33228f4](https://github.com/clap-rs/clap/commit/d33228f40b5fefb84cf3dd51546bfb340dcd9f5a))
* **Rustdoc:**  adds portions of the readme to main rustdoc page ([6f9ee181](https://github.com/clap-rs/clap/commit/6f9ee181e69d90bd4206290e59d6f3f1e8f0cbb2), closes [#293](https://github.com/clap-rs/clap/issues/293))

#### Bug Fixes

*   grammar error in some conflicting option errors ([e73b07e1](https://github.com/clap-rs/clap/commit/e73b07e19474323ad2260da66abbf6a6d4ecbd4f))
* **Unified Help:**  sorts both flags and options as a unified category ([2a223dad](https://github.com/clap-rs/clap/commit/2a223dad82901fa2e74baad3bfc4c7b94509300f))
* **Usage:**  fixes a bug where required args aren't filtered properly ([72b453dc](https://github.com/clap-rs/clap/commit/72b453dc170af3050bb123d35364f6da77fc06d7), closes [#277](https://github.com/clap-rs/clap/issues/277))
* **Usage Strings:**  fixes a bug ordering of elements in usage strings ([aaf0d6fe](https://github.com/clap-rs/clap/commit/aaf0d6fe7aa2403e76096c16204d254a9ee61ee2), closes [#298](https://github.com/clap-rs/clap/issues/298))

#### Features

*   supports -aValue style options ([0e3733e4](https://github.com/clap-rs/clap/commit/0e3733e4fec2015c2d566a51432dcd92cb69cad3))
* **Trailing VarArg:**  adds opt-in setting for final arg being vararg ([27018b18](https://github.com/clap-rs/clap/commit/27018b1821a4bcd5235cfe92abe71b3c99efc24d), closes [#278](https://github.com/clap-rs/clap/issues/278))



## v1.4.3 (2015-09-30)


#### Features

*   allows accessing arg values by group name ([c92a4b9e](https://github.com/clap-rs/clap/commit/c92a4b9eff2d679957f61c0c41ff404b40d38a91))

#### Documentation

*   use links to examples instead of plain text ([bb4fe237](https://github.com/clap-rs/clap/commit/bb4fe237858535627271465147add537e4556b43))

#### Bug Fixes

* **Help Message:**  required args no longer double list in usage ([1412e639](https://github.com/clap-rs/clap/commit/1412e639e0a79df84936d1101a837f90077d1c83), closes [#277](https://github.com/clap-rs/clap/issues/277))
* **Possible Values:**  possible value validation is restored ([f121ae74](https://github.com/clap-rs/clap/commit/f121ae749f8f4bfe754ef2e8a6dfc286504b5b75), closes [#287](https://github.com/clap-rs/clap/issues/287))



## v1.4.2 (2015-09-23)


#### Bug Fixes

* **Conflicts:**  fixes bug with conflicts not removing required args ([e17fcec5](https://github.com/clap-rs/clap/commit/e17fcec53b3216ad047a13dddc6f740473fad1a1), closes [#271](https://github.com/clap-rs/clap/issues/271))



## v1.4.1 (2015-09-22)


#### Examples

*   add clap_app quick example ([4ba6249c](https://github.com/clap-rs/clap/commit/4ba6249c3cf4d2e083370d1fe4dcc7025282c28a))

#### Features

* **Unicode:**  allows non-panicking on invalid unicode characters ([c5bf7ddc](https://github.com/clap-rs/clap/commit/c5bf7ddc8cfb876ec928a5aaf5591232bbb32e5d))

#### Documentation

*   properly names Examples section for rustdoc ([87ba5445](https://github.com/clap-rs/clap/commit/87ba54451d7ec7b1c9b9ef134f90bbe39e6fac69))
*   fixes various typos and spelling ([f85640f9](https://github.com/clap-rs/clap/commit/f85640f9f6d8fd3821a40e9b8b7a34fabb789d02))
* **Arg:**  unhides fields of the Arg struct ([931aea88](https://github.com/clap-rs/clap/commit/931aea88427edf43a3da90d5a500c1ff2b2c3614))

#### Bug Fixes

*   flush the buffer in App::print_version() ([cbc42a37](https://github.com/clap-rs/clap/commit/cbc42a37d212d84d22b1777d08e584ff191934e7))
*   Macro benchmarks ([13712da1](https://github.com/clap-rs/clap/commit/13712da1d36dc7614eec3a10ad488257ba615751))



## v1.4.0 (2015-09-09)


#### Features

*   allows printing help message by library consumers ([56b95f32](https://github.com/clap-rs/clap/commit/56b95f320875c62dda82cb91b29059671e120ed1))
*   allows defining hidden args and subcmds ([2cab4d03](https://github.com/clap-rs/clap/commit/2cab4d0334ea3c2439a1d4bfca5bf9905c7ea9ac), closes [#231](https://github.com/clap-rs/clap/issues/231))
*   Builder macro to assist with App/Arg/Group/SubCommand building ([443841b0](https://github.com/clap-rs/clap/commit/443841b012a8d795cd5c2bd69ae6e23ef9b16477))
* **Errors:**  allows consumers to write to stderr and exit on error ([1e6403b6](https://github.com/clap-rs/clap/commit/1e6403b6a863574fa3cb6946b1fb58f034e8664c))



## v1.3.2 (2015-09-08)


#### Documentation

*   fixed ErrorKind docs ([dd057843](https://github.com/clap-rs/clap/commit/dd05784327fa070eb6ce5ce89a8507e011d8db94))
* **ErrorKind:**  changed examples content ([b9ca2616](https://github.com/clap-rs/clap/commit/b9ca261634b89613bbf3d98fd74d55cefbb31a8c))

#### Bug Fixes

*   fixes a bug where the help subcommand wasn't overridable ([94003db4](https://github.com/clap-rs/clap/commit/94003db4b5eebe552ca337521c1c001295822745))

#### Features

*   adds ability not consume self when parsing matches and/or exit on help ([94003db4](https://github.com/clap-rs/clap/commit/94003db4b5eebe552ca337521c1c001295822745))
* **App:**  Added ability for users to handle errors themselves ([934e6fbb](https://github.com/clap-rs/clap/commit/934e6fbb643b2385efc23444fe6fce31494dc288))



## v1.3.1 (2015-09-04)


#### Examples

* **17_yaml:**  fixed example ([9b848622](https://github.com/clap-rs/clap/commit/9b848622296c8c5c7b9a39b93ddd41f51df790b5))

#### Performance

*   changes ArgGroup HashSets to Vec ([3cb4a48e](https://github.com/clap-rs/clap/commit/3cb4a48ebd15c20692f4f3a2a924284dc7fd5e10))
*   changes BTreeSet for Vec in some instances ([baab2e3f](https://github.com/clap-rs/clap/commit/baab2e3f4060e811abee14b1654cbcd5cf3b5fea))



## v1.3.0 (2015-09-01)


#### Features

* **YAML:**  allows building a CLI from YAML files ([86cf4c45](https://github.com/clap-rs/clap/commit/86cf4c45626a36b8115446952f9069f73c1debc3))
* **ArgGroups:**  adds support for building ArgGroups from yaml ([ecf88665](https://github.com/clap-rs/clap/commit/ecf88665cbff367018b29161a1b75d44a212707d))
* **Subcommands:**  adds support for subcommands from yaml ([e415cf78](https://github.com/clap-rs/clap/commit/e415cf78ba916052d118a8648deba2b9c16b1530))

#### Documentation

* **YAML:**  adds examples for using YAML to build a CLI ([ab41d7f3](https://github.com/clap-rs/clap/commit/ab41d7f38219544750e6e1426076dc498073191b))
* **Args from YAML:**  fixes doc examples ([19b348a1](https://github.com/clap-rs/clap/commit/19b348a10050404cd93888dbbbe4f396681b67d0))
* **Examples:**  adds better usage examples instead of having unused variables ([8cbacd88](https://github.com/clap-rs/clap/commit/8cbacd8883004fe71a8ea036ec4391c7dd8efe94))

#### Examples

*   Add AppSettings example ([12705079](https://github.com/clap-rs/clap/commit/12705079ca96a709b4dd94f7ddd20a833b26838c))

#### Bug Fixes

* **Unified Help Messages:**  fixes a crash from this setting and no opts ([169ffec1](https://github.com/clap-rs/clap/commit/169ffec1003d58d105d7ef2585b3425e57980000), closes [#210](https://github.com/clap-rs/clap/issues/210))



## v1.2.5 (2015-08-27)


#### Examples

*   add custom validator example ([b9997d1f](https://github.com/clap-rs/clap/commit/b9997d1fca74d4d8f93971f2a01bdf9798f913d5))
*   fix indentation ([d4f1b740](https://github.com/clap-rs/clap/commit/d4f1b740ede410fd2528b9ecd89592c2fd8b1e20))

#### Features

* **Args:**  allows opts and args to define a name for help and usage msgs ([ad962ec4](https://github.com/clap-rs/clap/commit/ad962ec478da999c7dba0afdb84c266f4d09b1bd))



## v1.2.4 (2015-08-26)


#### Bug Fixes

* **Possible Values:**  fixes a bug where suggestions aren't made when using --long=value format ([3d5e9a6c](https://github.com/clap-rs/clap/commit/3d5e9a6cedb26668839b481c9978e2fbbab8be6f), closes [#192](https://github.com/clap-rs/clap/issues/192))



## v1.2.3 (2015-08-24)


#### Bug Fixes

* **App, Args:**  fixed subcommand reqs negation ([b41afa8c](https://github.com/clap-rs/clap/commit/b41afa8c3ded3d1be12f7a2f8ea06cc44afc9458), closes [#188](https://github.com/clap-rs/clap/issues/188))



## v1.2.2 (2015-08-23)


#### Bug Fixes

*   fixed confusing error message, also added test for it ([fc7a31a7](https://github.com/clap-rs/clap/commit/fc7a31a745efbf1768ee2c62cd3bb72bfe30c708))
* **App:**  fixed requirmets overriding ([9c135eb7](https://github.com/clap-rs/clap/commit/9c135eb790fa16183e5bdb2009ddc3cf9e25f99f))



## v1.2.1 (2015-08-20)


#### Documentation

* **README.md:**  updates for new features ([16cf9245](https://github.com/clap-rs/clap/commit/16cf9245fb5fc4cf6face898e358368bf9961cbb))

#### Features

*   implements posix compatible conflicts for long args ([8c2d48ac](https://github.com/clap-rs/clap/commit/8c2d48acf5473feebd721a9049a9c9b7051e70f9))
*   added overrides to support conflicts in POSIX compatible manner ([0b916a00](https://github.com/clap-rs/clap/commit/0b916a00de26f6941538f6bc5f3365fa302083c1))
* **Args:**  allows defining POSIX compatible argument conflicts ([d715646e](https://github.com/clap-rs/clap/commit/d715646e69759ccd95e01f49b04f489827ecf502))

#### Bug Fixes

*   fixed links in cargo and license buttons ([6d9837ad](https://github.com/clap-rs/clap/commit/6d9837ad9a9e006117cd7372fdc60f9a3889c7e2))

#### Performance

* **Args and Apps:**  changes HashSet->Vec in some instances for increased performance ([d0c3b379](https://github.com/clap-rs/clap/commit/d0c3b379700757e0a9b0c40af709f8af1f5b4949))



## v1.2.0 (2015-08-15)


#### Bug Fixes

*   fixed misspell and enum name ([7df170d7](https://github.com/clap-rs/clap/commit/7df170d7f4ecff06608317655d1e0c4298f62076))
*   fixed use for clap crate ([dc3ada73](https://github.com/clap-rs/clap/commit/dc3ada738667d4b689678f79d14251ee82004ece))

#### Documentation

*   updates docs for new features ([03496547](https://github.com/clap-rs/clap/commit/034965471782d872ca495045b58d34b31807c5b1))
*   fixed docs for previous changes ([ade36778](https://github.com/clap-rs/clap/commit/ade367780c366425de462506d256e0f554ed3b9c))

#### Improvements

* **AppSettings:**  adds ability to add multiple settings at once ([4a00e251](https://github.com/clap-rs/clap/commit/4a00e2510d0ca8d095d5257d51691ba3b61c1374))

#### Features

*   Replace application level settings with enum variants ([618dc4e2](https://github.com/clap-rs/clap/commit/618dc4e2c205bf26bc43146164e65eb1f6b920ed))
* **Args:**  allows for custom argument value validations to be defined ([84ae2ddb](https://github.com/clap-rs/clap/commit/84ae2ddbceda34b5cbda98a6959edaa52fde2e1a), closes [#170](https://github.com/clap-rs/clap/issues/170))



## v1.1.6 (2015-08-01)


#### Bug Fixes

*   fixes two bugs in App when printing newlines in help and subcommands required error ([d63c0136](https://github.com/clap-rs/clap/commit/d63c0136310db9dd2b1c7b4745938311601d8938))



## v1.1.5 (2015-07-29)

#### Performance

*   removes some unneeded allocations ([93e915df](https://github.com/clap-rs/clap/commit/93e915dfe300f7b7d6209ca93323c6a46f89a8c1))

## v1.1.4 (2015-07-20)


#### Improvements

* **Usage Strings**  displays a [--] when it may be helpful ([86c3be85](https://github.com/clap-rs/clap/commit/86c3be85fb6f77f83b5a6d2df40ae60937486984))

#### Bug Fixes

* **Macros**  fixes a typo in a macro generated error message ([c9195c5f](https://github.com/clap-rs/clap/commit/c9195c5f92abb8cd6a37b4f4fbb2f1fee2a8e368))
* **Type Errors**  fixes formatting of error output when failed type parsing ([fe5d95c6](https://github.com/clap-rs/clap/commit/fe5d95c64f3296e6eddcbec0cb8b86659800145f))



## v1.1.3 (2015-07-18)


#### Documentation

*   updates README.md to include lack of color support on Windows ([52f81e17](https://github.com/clap-rs/clap/commit/52f81e17377b18d2bd0f34693b642b7f358998ee))

#### Bug Fixes

*   fixes formatting bug which prevented compiling on windows ([9cb5dceb](https://github.com/clap-rs/clap/commit/9cb5dceb3e5fe5e0e7b24619ff77e5040672b723), closes [#163](https://github.com/clap-rs/clap/issues/163))



## v1.1.2 (2015-07-17)


#### Bug Fixes

*   fixes a bug when parsing multiple {n} newlines inside help strings ([6d214b54](https://github.com/clap-rs/clap/commit/6d214b549a9b7e189a94e5fa2b7c92cc333ca637))



## v1.1.1 (2015-07-17)


#### Bug Fixes

*   fixes a logic bug and allows setting Arg::number_of_values() < 2 ([42b6d1fc](https://github.com/clap-rs/clap/commit/42b6d1fc3c519c92dfb3af15276e7d3b635e6cfe), closes [#161](https://github.com/clap-rs/clap/issues/161))



## v1.1.0 (2015-07-16)


#### Features

*   allows creating unified help messages, a la docopt or getopts ([52bcd892](https://github.com/clap-rs/clap/commit/52bcd892ea51564ce463bc5865acd64f8fe91cb1), closes [#158](https://github.com/clap-rs/clap/issues/158))
*   allows stating all subcommands should *not* have --version flags ([336c476f](https://github.com/clap-rs/clap/commit/336c476f631d512b54ac56fdca6f29ebdc2c00c5), closes [#156](https://github.com/clap-rs/clap/issues/156))
*   allows setting version number to auto-propagate through subcommands ([bc66d3c6](https://github.com/clap-rs/clap/commit/bc66d3c6deedeca62463fff95369ab1cfcdd366b), closes [#157](https://github.com/clap-rs/clap/issues/157))

#### Improvements

* **Help Strings**  properly aligns and handles newlines in long help strings ([f9800a29](https://github.com/clap-rs/clap/commit/f9800a29696dd2cc0b0284bf693b3011831e556f), closes [#145](https://github.com/clap-rs/clap/issues/145))


#### Performance

* **Help Messages**  big performance improvements when printing help messages ([52bcd892](https://github.com/clap-rs/clap/commit/52bcd892ea51564ce463bc5865acd64f8fe91cb1))

#### Documentation

*   updates readme with new features ([8232f7bb](https://github.com/clap-rs/clap/commit/8232f7bb52e88862bc13c3d4f99ee4f56cfe4bc0))
*   fix incorrect code example for `App::subcommand_required` ([8889689d](https://github.com/clap-rs/clap/commit/8889689dc6336ccc45b2c9f2cf8e2e483a639e93))


## v1.0.3 (2015-07-11)


#### Improvements

* **Errors**  writes errors to stderr ([cc76ab8c](https://github.com/clap-rs/clap/commit/cc76ab8c2b77c67b42f4717ded530df7806142cf), closes [#154](https://github.com/clap-rs/clap/issues/154))

#### Documentation

* **README.md**  updates example help message to new format ([0aca29bd](https://github.com/clap-rs/clap/commit/0aca29bd5d6d1a4e9971bdc88d946ffa58606efa))



## v1.0.2 (2015-07-09)


#### Improvements

* **Usage**  re-orders optional arguments and required to natural standard ([dc7e1fce](https://github.com/clap-rs/clap/commit/dc7e1fcea5c85d317018fb201d2a9262249131b4), closes [#147](https://github.com/clap-rs/clap/issues/147))



## v1.0.1 (2015-07-08)


#### Bug Fixes

*   allows empty values when using --long='' syntax ([083f82d3](https://github.com/clap-rs/clap/commit/083f82d333b69720a6ef30074875310921d964d1), closes [#151](https://github.com/clap-rs/clap/issues/151))



## v1.0.0 (2015-07-08)


#### Documentation

* **README.md**  adds new features to what's new list ([938f7f01](https://github.com/clap-rs/clap/commit/938f7f01340f521969376cf4e2e3d9436bca21f7))
* **README.md**  use with_name for subcommands ([28b7e316](https://github.com/clap-rs/clap/commit/28b7e3161fb772e5309042648fe8c3a420645bac))

#### Features

*   args can now be parsed from arbitrary locations, not just std::env::args() ([75312528](https://github.com/clap-rs/clap/commit/753125282b1b9bfff875f1557ce27610edcc59e1))



## v1.0.0-beta (2015-06-30)


#### Features

*   allows waiting for user input on error ([d0da3bdd](https://github.com/clap-rs/clap/commit/d0da3bdd9d1871541907ea9c645322a74d260e07), closes [#140](https://github.com/clap-rs/clap/issues/140))
* **Help**  allows one to fully override the auto-generated help message ([26d5ae3e](https://github.com/clap-rs/clap/commit/26d5ae3e330d1e150811d5b60b2b01a8f8df854e), closes [#141](https://github.com/clap-rs/clap/issues/141))

#### Documentation

*   adds "whats new" section to readme ([ff149a29](https://github.com/clap-rs/clap/commit/ff149a29dd9e179865e6d577cd7dc87c54f8f95c))

#### Improvements

*   removes deprecated functions in prep for 1.0 ([274484df](https://github.com/clap-rs/clap/commit/274484dfd08fff4859cefd7e9bef3b73d3a9cb5f))



## v0.11.0 (2015-06-17) - BREAKING CHANGE


#### Documentation

*   updates docs to new version flag defaults ([ebf442eb](https://github.com/clap-rs/clap/commit/ebf442ebebbcd2ec6bfe2c06566c9d362bccb112))

#### Features

* **Help and Version**  default short for version is now `-V` but can be overridden (only breaks manual documentation) (**BREAKING CHANGE** [eb1d9320](https://github.com/clap-rs/clap/commit/eb1d9320c509c1e4e57d7c7959da82bcfe06ada0))



## v0.10.5 (2015-06-06)


#### Bug Fixes

* **Global Args**  global arguments propagate fully now ([1f377960](https://github.com/clap-rs/clap/commit/1f377960a48c82f54ca5f39eb56bcb393140b046), closes [#137](https://github.com/clap-rs/clap/issues/137))



## v0.10.4 (2015-06-06)


#### Bug Fixes

* **Global Args**  global arguments propagate fully now ([8f2c0160](https://github.com/clap-rs/clap/commit/8f2c0160c8d844daef375a33dbaec7d89de00a00), closes [#137](https://github.com/clap-rs/clap/issues/137))



## v0.10.3 (2015-05-31)


#### Bug Fixes

* **Global Args**  fixes a bug where globals only transfer to one subcommand ([a37842ee](https://github.com/clap-rs/clap/commit/a37842eec1ee3162b86fdbda23420b221cdb1e3b), closes [#135](https://github.com/clap-rs/clap/issues/135))



## v0.10.2 (2015-05-30)


#### Improvements

* **Binary Names**  allows users to override the system determined bin name ([2191fe94](https://github.com/clap-rs/clap/commit/2191fe94bda35771383b52872fb7f5421b178be1), closes [#134](https://github.com/clap-rs/clap/issues/134))

#### Documentation

*   adds contributing guidelines ([6f76bd0a](https://github.com/clap-rs/clap/commit/6f76bd0a07e8b7419b391243ab2d6687cd8a9c5f))



## v0.10.1 (2015-05-26)


#### Features

*   can now specify that an app or subcommand should display help on no args or subcommands ([29ca7b2f](https://github.com/clap-rs/clap/commit/29ca7b2f74376ca0cdb9d8ee3bfa99f7640cc404), closes [#133](https://github.com/clap-rs/clap/issues/133))



## v0.10.0 (2015-05-23)


#### Features

* **Global Args**  allows args that propagate down to child commands ([2bcc6137](https://github.com/clap-rs/clap/commit/2bcc6137a83cb07757771a0afea953e68e692f0b), closes [#131](https://github.com/clap-rs/clap/issues/131))

#### Improvements

* **Colors**  implements more structured colored output ([d6c3ed54](https://github.com/clap-rs/clap/commit/d6c3ed54d21cf7b40d9f130d4280ff5448522fc5), closes [#129](https://github.com/clap-rs/clap/issues/129))

#### Deprecations

* **SubCommand/App**  several methods and functions for stable release ([28b73855](https://github.com/clap-rs/clap/commit/28b73855523ad170544afdb20665db98702fbe70))

#### Documentation

*   updates for deprecations and new features ([743eefe8](https://github.com/clap-rs/clap/commit/743eefe8dd40c1260065ce086d572e9e9358bc4c))



## v0.9.2 (2015-05-20)


#### Bug Fixes

* **help**  allows parent requirements to be ignored with help and version ([52218cc1](https://github.com/clap-rs/clap/commit/52218cc1fdb06a42456c964d98cc2c7ac3432412), closes [#124](https://github.com/clap-rs/clap/issues/124))



## v0.9.1 (2015-05-18)


#### Bug Fixes

* **help**  fixes a bug where requirements are included as program name in help and version ([08ba3f25](https://github.com/clap-rs/clap/commit/08ba3f25cf38b149229ba8b9cb37a5804fe6b789))



## v0.9.0 (2015-05-17)


#### Improvements

* **usage**  usage strings now include parent command requirements ([dd8f21c7](https://github.com/clap-rs/clap/commit/dd8f21c7c15cde348fdcf44fa7c205f0e98d2e4a), closes [#125](https://github.com/clap-rs/clap/issues/125))
* **args**  allows consumer of clap to decide if empty values are allowed or not ([ab4ec609](https://github.com/clap-rs/clap/commit/ab4ec609ccf692b9b72cccef5c9f74f5577e360d), closes [#122](https://github.com/clap-rs/clap/issues/122))

#### Features

* **subcommands**
  *  allows optionally specifying that no subcommand is an error ([7554f238](https://github.com/clap-rs/clap/commit/7554f238fd3afdd60b7e4dcf00ff4a9eccf842c1), closes [#126](https://github.com/clap-rs/clap/issues/126))
  *  subcommands can optionally negate parent requirements ([4a4229f5](https://github.com/clap-rs/clap/commit/4a4229f500e21c350e1ef78dd09ef27559653288), closes [#123](https://github.com/clap-rs/clap/issues/123))



## v0.8.6 (2015-05-17)


#### Bug Fixes

* **args**  `-` can now be parsed as a value for an argument ([bc12e78e](https://github.com/clap-rs/clap/commit/bc12e78eadd7eaf9d008a8469fdd2dfd7990cb5d), closes [#121](https://github.com/clap-rs/clap/issues/121))



## v0.8.5 (2015-05-15)


#### Bug Fixes

* **macros**  makes macro errors consistent with others ([0c264a8c](https://github.com/clap-rs/clap/commit/0c264a8ca57ec1cfdcb74dae79145d766cdc9b97), closes [#118](https://github.com/clap-rs/clap/issues/118))

#### Features

* **macros**
  *  arg_enum! and simple_enum! provide a Vec<&str> of variant names ([30fa87ba](https://github.com/clap-rs/clap/commit/30fa87ba4e0f3189351d8f4f78b72e616a30d0bd), closes [#119](https://github.com/clap-rs/clap/issues/119))
  *  arg_enum! and simple_enum! auto-implement Display ([d1219f0d](https://github.com/clap-rs/clap/commit/d1219f0d1371d872061bd0718057eca4ef47b739), closes [#120](https://github.com/clap-rs/clap/issues/120))



## v0.8.4 (2015-05-12)


#### Bug Fixes

* **suggestions**  --help and --version now get suggestions ([d2b3b1fa](https://github.com/clap-rs/clap/commit/d2b3b1faa0bdc1c5d2350cc4635aba81e02e9d96), closes [#116](https://github.com/clap-rs/clap/issues/116))



## v0.8.3 (2015-05-10)


#### Bug Fixes

* **usage**  groups unfold their members in usage strings ([55d15582](https://github.com/clap-rs/clap/commit/55d155827ea4a6b077a83669701e797ce1ad68f4), closes [#114](https://github.com/clap-rs/clap/issues/114))

#### Performance

* **usage**  removes unneeded allocations ([fd53cd18](https://github.com/clap-rs/clap/commit/fd53cd188555f5c3dc8bc341c5d7eb04b761a70f))



## v0.8.2 (2015-05-08)


#### Bug Fixes

* **usage strings**  positional arguments are presented in index order ([eb0e374e](https://github.com/clap-rs/clap/commit/eb0e374ecf952f1eefbc73113f21e0705936e40b), closes [#112](https://github.com/clap-rs/clap/issues/112))



## v0.8.1 (2015-05-06)


#### Bug Fixes

* **subcommands**  stops parsing multiple values when subcommands are found ([fc79017e](https://github.com/clap-rs/clap/commit/fc79017eced04fd41cc1801331e5054df41fac17), closes [#109](https://github.com/clap-rs/clap/issues/109))

#### Improvements

* **color**  reduces color in error messages ([aab44cca](https://github.com/clap-rs/clap/commit/aab44cca6352f47e280c296e50c535f5d752dd46), closes [#110](https://github.com/clap-rs/clap/issues/110))
* **suggestions**  adds suggested arguments to usage strings ([99447414](https://github.com/clap-rs/clap/commit/994474146e9fb8b701af773a52da71553d74d4b7))



## v0.8.0 (2015-05-06)


#### Bug Fixes

* **did-you-mean**  for review ([0535cfb0](https://github.com/clap-rs/clap/commit/0535cfb0c711331568b4de8080eeef80bd254b68))
* **Positional**  positionals were ignored if they matched a subcmd, even after '--' ([90e7b081](https://github.com/clap-rs/clap/commit/90e7b0818741668b47cbe3becd029bab588e3553))
* **help**  fixes bug where space between arg and help is too long ([632fb115](https://github.com/clap-rs/clap/commit/632fb11514c504999ea86bdce47cdd34f8ebf646))

#### Features

* **from_usage**  adds ability to add value names or num of vals in usage string ([3d581976](https://github.com/clap-rs/clap/commit/3d58197674ed7886ca315efb76e411608a327501), closes [#98](https://github.com/clap-rs/clap/issues/98))
* **did-you-mean**
  *  gate it behind 'suggestions' ([c0e38351](https://github.com/clap-rs/clap/commit/c0e383515d01bdd5ca459af9c2f7e2cf49e2488b))
  *  for possible values ([1cc2deb2](https://github.com/clap-rs/clap/commit/1cc2deb29158e0e4e8b434e4ce26b3d819301a7d))
  *  for long flags (i.e. --long) ([52a0b850](https://github.com/clap-rs/clap/commit/52a0b8505c99354bdf5fd1cd256cf41197ac2d81))
  *  for subcommands ([06e869b5](https://github.com/clap-rs/clap/commit/06e869b5180258047ed3c60ba099de818dd25fff))
* **Flags**  adds suggestions functionality ([8745071c](https://github.com/clap-rs/clap/commit/8745071c3257dd327c497013516f12a823df9530))
* **errors**  colorizes output red on error ([f8b26b13](https://github.com/clap-rs/clap/commit/f8b26b13da82ba3ba9a932d3d1ab4ea45d1ab036))

#### Improvements

* **arg_enum**  allows ascii case insensitivity for enum variants ([b249f965](https://github.com/clap-rs/clap/commit/b249f9657c6921c004764bd80d13ebca81585eec), closes [#104](https://github.com/clap-rs/clap/issues/104))
* **clap-test**  simplified `make test` invocation ([d17dcb29](https://github.com/clap-rs/clap/commit/d17dcb2920637a1f58c61c596b7bd362fd53047c))

#### Documentation

* **README**  adds details about optional and new features ([960389de](https://github.com/clap-rs/clap/commit/960389de02c9872aaee9adabe86987f71f986e39))
* **clap**  fix typos caught by codespell ([8891d929](https://github.com/clap-rs/clap/commit/8891d92917aa1a069cca67272be41b99e548356e))
* **from_usage**  explains new usage strings with multiple values ([05476fc6](https://github.com/clap-rs/clap/commit/05476fc61cd1e5f4a4e750d258c878732a3a9c64))



## v0.7.6 (2015-05-05)


#### Improvements

* **Options**  adds number of values to options in help/usage ([c1c993c4](https://github.com/clap-rs/clap/commit/c1c993c419d18e35c443785053d8de9a2ef88073))

#### Features

* **from_usage**  adds ability to add value names or num of vals in usage string ([ad55748c](https://github.com/clap-rs/clap/commit/ad55748c265cf27935c7b210307d2040b6a09125), closes [#98](https://github.com/clap-rs/clap/issues/98))

#### Bug Fixes

* **MultipleValues**  properly distinguishes between multiple values and multiple occurrences ([dd2a7564](https://github.com/clap-rs/clap/commit/dd2a75640ca68a91b973faad15f04df891356cef), closes [#99](https://github.com/clap-rs/clap/issues/99))
* **help**  fixes tab alignment with multiple values ([847001ff](https://github.com/clap-rs/clap/commit/847001ff6d8f4d9518e810fefb8edf746dd0f31e))

#### Documentation

* **from_usage**  explains new usage strings with multiple values ([5a3a42df](https://github.com/clap-rs/clap/commit/5a3a42dfa3a783537f88dedc0fd5f0edcb8ea372))



## v0.7.5 (2015-05-04)


#### Bug Fixes

* **Options**  fixes bug where options with no value don't error out ([a1fb94be](https://github.com/clap-rs/clap/commit/a1fb94be53141572ffd97aad037295d4ffec82d0))



## v0.7.4 (2015-05-03)


#### Bug Fixes

* **Options**  fixes a bug where option arguments in succession get their values skipped ([f66334d0](https://github.com/clap-rs/clap/commit/f66334d0ce984e2b56e5c19abb1dd536fae9342a))



## v0.7.3 (2015-05-03)


#### Bug Fixes

* **RequiredValues**  fixes a bug where missing values are parsed as missing arguments ([93c4a723](https://github.com/clap-rs/clap/commit/93c4a7231ba1a08152648598f7aa4503ea82e4de))

#### Improvements

* **ErrorMessages**  improves error messages and corrections ([a29c3983](https://github.com/clap-rs/clap/commit/a29c3983c4229906655a29146ec15a0e46dd942d))
* **ArgGroups**  improves requirement and confliction support for groups ([c236dc5f](https://github.com/clap-rs/clap/commit/c236dc5ff475110d2a1b80e62903f80296163ad3))



## v0.7.2 (2015-05-03)


#### Bug Fixes

* **RequiredArgs**  fixes bug where required-by-default arguments are not listed in usage ([12aea961](https://github.com/clap-rs/clap/commit/12aea9612d290845ba86515c240aeeb0a21198db), closes [#96](https://github.com/clap-rs/clap/issues/96))



## v0.7.1 (2015-05-01)


#### Bug Fixes

* **MultipleValues**  stops evaluating values if the max or exact number of values was reached ([86d92c9f](https://github.com/clap-rs/clap/commit/86d92c9fdbf9f422442e9562977bbaf268dbbae1))



## v0.7.0 (2015-04-30) - BREAKING CHANGE


#### Bug Fixes

* **from_usage**  removes bug where usage strings have no help text ([ad4e5451](https://github.com/clap-rs/clap/commit/ad4e54510739aeabf75f0da3278fb0952db531b3), closes [#83](https://github.com/clap-rs/clap/issues/83))

#### Features

* **MultipleValues**
  *  add support for minimum and maximum number of values ([53f6b8c9](https://github.com/clap-rs/clap/commit/53f6b8c9d8dc408b4fa9f833fc3a63683873c42f))
  *  adds support limited number and named values ([ae09f05e](https://github.com/clap-rs/clap/commit/ae09f05e92251c1b39a83d372736fcc7b504e432))
  *  implement shorthand for options with multiple values ([6669f0a9](https://github.com/clap-rs/clap/commit/6669f0a9687d4f668523145d7bd5c007d1eb59a8))
* **arg**  allow other types besides Vec for multiple value settings (**BREAKING CHANGE** [0cc2f698](https://github.com/clap-rs/clap/commit/0cc2f69839b9b1db5d06330771b494783049a88e), closes [#87](https://github.com/clap-rs/clap/issues/87))
* **usage**  implement smart usage strings on errors ([d77048ef](https://github.com/clap-rs/clap/commit/d77048efb1e595ffe831f1a2bea2f2700db53b9f), closes [#88](https://github.com/clap-rs/clap/issues/88))



## v0.6.9 (2015-04-29)


#### Bug Fixes

* **from_usage**  removes bug where usage strings have no help text ([ad4e5451](https://github.com/clap-rs/clap/commit/ad4e54510739aeabf75f0da3278fb0952db531b3), closes [#83](https://github.com/clap-rs/clap/issues/83))



## 0.6.8 (2015-04-27)


#### Bug Fixes

* **help**  change long help --long=long -> --long <long> ([1e25abfc](https://github.com/clap-rs/clap/commit/1e25abfc36679ab89eae71bf98ced4de81992d00))
* **RequiredArgs**  required by default args should no longer be required when their exclusions are present ([4bb4c3cc](https://github.com/clap-rs/clap/commit/4bb4c3cc076b49e86720e882bf8c489877199f2d))

#### Features

* **ArgGroups**  add ability to create arg groups ([09eb4d98](https://github.com/clap-rs/clap/commit/09eb4d9893af40c347e50e2b717e1adef552357d))



## v0.6.7 (2015-04-22)


#### Bug Fixes

* **from_usage**  fix bug causing args to not be required ([b76129e9](https://github.com/clap-rs/clap/commit/b76129e9b71a63365d5c77a7f57b58dbd1e94d49))

#### Features

* **apps**  add ability to display additional help info after auto-gen'ed help msg ([65cc259e](https://github.com/clap-rs/clap/commit/65cc259e4559cbe3653c865ec0c4b1e42a389b07))



## v0.6.6 (2015-04-19)


#### Bug Fixes

* **from_usage**  tabs and spaces should be treated equally ([4fd44181](https://github.com/clap-rs/clap/commit/4fd44181d55d8eb88caab1e625231cfa3129e347))

#### Features

* **macros.rs**  add macro to get version from Cargo.toml ([c630969a](https://github.com/clap-rs/clap/commit/c630969aa3bbd386379219cae27ba1305b117f3e))



## v0.6.5 (2015-04-19)


#### Bug Fixes

* **macros.rs**  fix use statements for trait impls ([86e4075e](https://github.com/clap-rs/clap/commit/86e4075eb111937c8a7bdb344e866e350429f042))



## v0.6.4 (2015-04-17)


#### Features

* **macros**  add ability to create enums pub or priv with derives ([2c499f80](https://github.com/clap-rs/clap/commit/2c499f8015a199827cdf1fa3ec4f6f171722f8c7))



## v0.6.3 (2015-04-16)


#### Features

* **macros**  add macro to create custom enums to use as types ([fb672aff](https://github.com/clap-rs/clap/commit/fb672aff561c29db2e343d6c607138f141aca8b6))



## v0.6.2 (2015-04-14)


#### Features

* **macros**
  *  add ability to get multiple typed values or exit ([0b87251f](https://github.com/clap-rs/clap/commit/0b87251fc088234bee51c323c2b652d7254f7a59))
  *  add ability to get a typed multiple values ([e243fe38](https://github.com/clap-rs/clap/commit/e243fe38ddbbf845a46c0b9baebaac3778c80927))
  *  add convenience macro to get a typed value or exit ([4b7cd3ea](https://github.com/clap-rs/clap/commit/4b7cd3ea4947780d9daa39f3e1ddab53ad4c7fef))
  *  add convenience macro to get a typed value ([8752700f](https://github.com/clap-rs/clap/commit/8752700fbb30e89ee68adbce24489ae9a24d33a9))



## v0.6.1 (2015-04-13)


#### Bug Fixes

* **from_usage**  trim all whitespace before parsing ([91d29045](https://github.com/clap-rs/clap/commit/91d2904599bd602deef2e515dfc65dc2863bdea0))



## v0.6.0 (2015-04-13)


#### Bug Fixes

* **tests**  fix failing doc tests ([3710cd69](https://github.com/clap-rs/clap/commit/3710cd69162f87221a62464f63437c1ce843ad3c))

#### Features

* **app**  add support for building args from usage strings ([d5d48bcf](https://github.com/clap-rs/clap/commit/d5d48bcf463a4e494ef758836bd69a4c220bbbb5))
* **args**  add ability to create basic arguments from a usage string ([ab409a8f](https://github.com/clap-rs/clap/commit/ab409a8f1db9e37cc70200f6f4a84a162692e618))



## v0.5.14 (2015-04-10)


#### Bug Fixes

* **usage**
  *  remove unneeded space ([51372789](https://github.com/clap-rs/clap/commit/5137278942121bc2593ce6e5dc224ec2682549e6))
  *  remove warning about unused variables ([ba817b9d](https://github.com/clap-rs/clap/commit/ba817b9d815e37320650973f1bea0e7af3030fd7))

#### Features

* **usage**  add ability to get usage string for subcommands too ([3636afc4](https://github.com/clap-rs/clap/commit/3636afc401c2caa966efb5b1869ef4f1ed3384aa))



## v0.5.13 (2015-04-09)


#### Features

* **SubCommands**  add method to get name and subcommand matches together ([64e53928](https://github.com/clap-rs/clap/commit/64e539280e23e567cf5de393b346eb0ca20e7eb5))
* **ArgMatches**  add method to get default usage string ([02462150](https://github.com/clap-rs/clap/commit/02462150ca750bdc7012627d7e8d96379d494d7f))



## v0.5.12 (2015-04-08)


#### Features

* **help**  sort arguments by name so as to not display a random order ([f4b2bf57](https://github.com/clap-rs/clap/commit/f4b2bf5767386013069fb74862e6e938dacf44d2))



## v0.5.11 (2015-04-08)


#### Bug Fixes

* **flags**  fix bug not allowing users to specify -v or -h ([90e72cff](https://github.com/clap-rs/clap/commit/90e72cffdee321b79eea7a2207119533540062b4))



## v0.5.10 (2015-04-08)


#### Bug Fixes

* **help**  fix spacing when option argument has not long version ([ca17fa49](https://github.com/clap-rs/clap/commit/ca17fa494b68e92da83ee364bf64b0687006824b))



## v0.5.9 (2015-04-08)


#### Bug Fixes

* **positional args**  all previous positional args become required when a latter one is required ([c14c3f31](https://github.com/clap-rs/clap/commit/c14c3f31fd557c165570b60911d8ee483d89d6eb), closes [#50](https://github.com/clap-rs/clap/issues/50))
* **clap**  remove unstable features for Rust 1.0 ([9abdb438](https://github.com/clap-rs/clap/commit/9abdb438e36e364d41550e7f5d44ebcaa8ee6b10))
* **args**  improve error messages for arguments with mutual exclusions ([18dbcf37](https://github.com/clap-rs/clap/commit/18dbcf37024daf2b76ca099a6f118b53827aa339), closes [#51](https://github.com/clap-rs/clap/issues/51))



## v0.5.8 (2015-04-08)


#### Bug Fixes

* **option args**  fix bug in getting the wrong number of occurrences for options ([82ad6ad7](https://github.com/clap-rs/clap/commit/82ad6ad77539cf9f9a03b78db466f575ebd972cc))
* **help**  fix formatting for option arguments with no long ([e8691004](https://github.com/clap-rs/clap/commit/e869100423d93fa3acff03c4620cbcc0d0e790a1))
* **flags**  add assertion to catch flags with specific value sets ([a0a2a40f](https://github.com/clap-rs/clap/commit/a0a2a40fed57f7c5ad9d68970d090e9856306c7d), closes [#52](https://github.com/clap-rs/clap/issues/52))
* **args**  improve error messages for arguments with mutual exclusions ([bff945fc](https://github.com/clap-rs/clap/commit/bff945fc5d03bba4266533340adcffb002508d1b), closes [#51](https://github.com/clap-rs/clap/issues/51))
* **tests**  add missing .takes_value(true) to option2 ([bdb0e88f](https://github.com/clap-rs/clap/commit/bdb0e88f696c8595c3def3bfb0e52d538c7be085))
* **positional args**  all previous positional args become required when a latter one is required ([343d47dc](https://github.com/clap-rs/clap/commit/343d47dcbf83786a45c0d0f01b27fd9dd76725de), closes [#50](https://github.com/clap-rs/clap/issues/50))



## v0.5.7 (2015-04-08)


#### Bug Fixes

* **args**  fix bug in arguments who are required and mutually exclusive ([6ceb88a5](https://github.com/clap-rs/clap/commit/6ceb88a594caae825605abc1cdad95204996bf29))



## v0.5.6 (2015-04-08)


#### Bug Fixes

* **help**  fix formatting of help and usage ([28691b52](https://github.com/clap-rs/clap/commit/28691b52f67e65c599e10e4ea2a0f6f9765a06b8))



## v0.5.5 (2015-04-08)


#### Bug Fixes

* **help**  fix formatting of help for flags and options ([6ec10115](https://github.com/clap-rs/clap/commit/6ec1011563a746f0578a93b76d45e63878e0f9a8))



## v0.5.4 (2015-04-08)


#### Features

* **help**  add '...' to indicate multiple values supported ([297ddba7](https://github.com/clap-rs/clap/commit/297ddba77000e2228762ab0eca50b480f7467386))



## v0.5.3 (2015-04-08)


#### Features

* **positionals**
  *  add assertions for positional args with multiple vals ([b7fa72d4](https://github.com/clap-rs/clap/commit/b7fa72d40f18806ec2042dd67a518401c2cf5681))
  *  add support for multiple values ([80784009](https://github.com/clap-rs/clap/commit/807840094109fbf90b348039ae22669ef27889ba))



## v0.5.2 (2015-04-08)


#### Bug Fixes

* **apps**  allow use of hyphens in application and subcommand names ([da549dcb](https://github.com/clap-rs/clap/commit/da549dcb6c7e0d773044ab17829744483a8b0f7f))



## v0.5.1 (2015-04-08)


#### Bug Fixes

* **args**  determine if the only arguments allowed are also required ([0a09eb36](https://github.com/clap-rs/clap/commit/0a09eb365ced9a03faf8ed24f083ef730acc90e8))



## v0.5.0 (2015-04-08)


#### Features

* **args**  add support for a specific set of allowed values on options or positional arguments ([270eb889](https://github.com/clap-rs/clap/commit/270eb88925b6dc2881bff1f31ee344f085d31809))



## v0.4.18 (2015-04-08)


#### Bug Fixes

* **usage**  display required args in usage, even if only required by others ([1b7316d4](https://github.com/clap-rs/clap/commit/1b7316d4a8df70b0aa584ccbfd33f68966ad2a54))

#### Features

* **subcommands**  properly list subcommands in help and usage ([4ee02344](https://github.com/clap-rs/clap/commit/4ee023442abc3dba54b68138006a52b714adf331))



## v0.4.17 (2015-04-08)


#### Bug Fixes

* **tests**  remove cargo test from claptests makefile ([1cf73817](https://github.com/clap-rs/clap/commit/1cf73817d6fb1dccb5b6a23b46c2efa8b567ad62))



## v0.4.16 (2015-04-08)


#### Bug Fixes

* **option**  fix bug with option occurrence values ([9af52e93](https://github.com/clap-rs/clap/commit/9af52e93cef9e17ac9974963f132013d0b97b946))
* **tests**  fix testing script bug and formatting ([d8f03a55](https://github.com/clap-rs/clap/commit/d8f03a55c4f74d126710ee06aad5a667246a8001))

#### Features

* **arg**  allow lifetimes other than 'static in arguments ([9e8c1fb9](https://github.com/clap-rs/clap/commit/9e8c1fb9406f8448873ca58bab07fe905f1551e5))

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