Added same alias funtionality for flags, now you can do:
```
Arg::with_name("flg")
.long("flag")
.short("f")
.alias("not_visible_flag")
.visible_alias("awesome_v_flag")
```
Signed-off-by: Salim Afiune <afiune@chef.io>
There are some cases where you need to have an argument to have an
alias, an example could be when you depricate one option in favor of
another one.
Now you are going to be able to alias arguments as follows:
```
Arg::with_name("opt")
.long("opt")
.short("o")
.takes_value(true)
.alias("invisible")
.visible_alias("visible")
```
Closes#669
In some cases settings were only propogated down one level deep, this
commit ensures settings are propogated down through all subcommands
recursively.
Closes#638
* feat: adds App::with_defaults to automatically use crate_authors! and crate_version! macros
One can now use
```rust
let a = App::with_defaults("My Program");
// same as
let a2 = App::new("My Program")
.version(crate_version!())
.author(crate_authors!());
```
Closes#600
* imp(YAML Errors): vastly improves error messages when using YAML
When errors are made while developing, the panic error messages have
been improved instead of relying on the default panic message which is
extremely unhelpful.
Closes#574
* imp(Completions): uses standard conventions for bash completion files, namely '{bin}.bash-completion'
Closes#567
* imp(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
Now `clap` will check if it should automatically place long help
messages on the next line after the flag/option. This is determined by
checking to see if the space taken by flag/option plus spaces and values
doesn't leave enough room for the entirety of the help message, with the
single exception of of if the flag/option/spaces/values is less than 25%
of the width.
Closes#597
* tests: updates help tests to new forced new line rules
* fix(Groups): fixes some usage strings that contain both args in groups and ones that conflict with each other
Args that conflict *and* are in a group will now only display in the
group and not in the usage string itself.
Closes#616
* chore: updates dep graph
Closes#633
* chore: clippy run
* style: changes debug header to match other Rust projects
* chore: increase version
For example, doing `myprog help subcmd1 subcmd2` would have incorrectly
produced the usage string, `myprog subcmd2 [options]` but now correctly
prints `myprog subcmd1 subcmd2 [options]`
Closes#618
The following completion would happen (using example 17_yaml.rs):
```
$ prog <tab>
help subcmd
```
```
$ prog -<tab><tab>
--help -h (Prints help information)
--max-vals (you can only supply a max of 3 values for me!)
--min-vals (you must supply at least two values to satisfy me)
--mode (shows an option with specific values)
--mult-vals (demos an option which has two named values)
--option -o (example option argument from yaml)
--version -V (Prints version information)
-F (demo flag argument)
```
```
$ prog --<tab><tab>
--help -h (Prints help information)
--max-vals (you can only supply a max of 3 values for me!)
--min-vals (you must supply at least two values to satisfy me)
--mode (shows an option with specific values)
--mult-vals (demos an option which has two named values)
--option -o (example option argument from yaml)
--version -V (Prints version information)
```
```
$ prog --mode <tab>
emacs (shows an option with specific values) vi (shows an option with specific values)
```
```
$ prog subcmd -<tab>
--help -h (Prints help information) -B (example subcommand option)
--version -V (Prints version information)
```
```
$ prog subcmd --<tab>
--help (Prints help information) --version (Prints version information)
```
Close#578
By using a build.rs "build script" one can now generate a bash completions script which allows tab
completions for the entire program, to include, subcommands, options, everything!
See the documentation for full examples and details.
Closes#376
Using this setting requires a value delimiter be present in order to parse multiple values.
Otherwise it is assumed no values follow, and moves on to the next arg with a clean slate.
These examples demonstrate what happens when `require_delimiter(true)` is used. Notice
everything works in this first example, as we use a delimiter, as expected.
```rust
let delims = App::new("reqdelims")
.arg(Arg::with_name("opt")
.short("o")
.takes_value(true)
.multiple(true)
.require_delimiter(true))
// Simulate "$ reqdelims -o val1,val2,val3"
.get_matches_from(vec![
"reqdelims", "-o", "val1,val2,val3",
]);
assert!(delims.is_present("opt"));
assert_eq!(delims.values_of("opt").unwrap().collect::<Vec<_>>(), ["val1", "val2", "val3"]);
```
In this next example, we will *not* use a delimiter. Notice it's now an error.
```rust
let res = App::new("reqdelims")
.arg(Arg::with_name("opt")
.short("o")
.takes_value(true)
.multiple(true)
.require_delimiter(true))
// Simulate "$ reqdelims -o val1 val2 val3"
.get_matches_from_safe(vec![
"reqdelims", "-o", "val1", "val2", "val3",
]);
assert!(res.is_err());
let err = res.unwrap_err();
assert_eq!(err.kind, ErrorKind::UnknownArgument);
```
What's happening is `-o` is getting `val1`, and because delimiters are required yet none
were present, it stops parsing `-o`. At this point it reaches `val2` and because no
positional arguments have been defined, it's an error of an unexpected argument.
In this final example, we contrast the above with `clap`'s default behavior where the above
is *not* an error.
```rust
let delims = App::new("reqdelims")
.arg(Arg::with_name("opt")
.short("o")
.takes_value(true)
.multiple(true))
// Simulate "$ reqdelims -o val1 val2 val3"
.get_matches_from(vec![
"reqdelims", "-o", "val1", "val2", "val3",
]);
assert!(delims.is_present("opt"));
assert_eq!(delims.values_of("opt").unwrap().collect::<Vec<_>>(), ["val1", "val2", "val3"]);
```
Imagine two args, an option `-o` which accepts mutliple values, and a positional arg `<file>`.
Prior to this change the following (incorrect) parses would have happened:
```
$ prog -o 1,2 some.txt
o = 1, 2, file
file =
```
Only when delimters are used, spaces stop parsing values for the option. The follow are now correct
```
$ prog -o 1,2 some.txt
o = 1, 2
file = some.txt
$ prog some.txt -o 1 2
o = 1, 2
file = some.txt
```
This still has the bi-product of:
```
$ prog -o 1 2 some.txt
o = 1, 2, some.txt
file =
```
This is simply a CLI design and documentation issue (i.e. don't allow options with unlimited
multiple values with positionaln args, or clearly document that positional args go first). This
will also be helped by the upcoming `Arg::require_delimiter`
Relates to #546
Imagine two args, an options `-o` and a positionanl arg `<file>` where the option allows multiple
values. Prior to this change the following (incorrect) parses were occurring:
```
$ prog -o=1 some.txt
o = 1, file
file =
```
This change stops parsing values at the space, only if the `=` was used.
```
$ prog -o=1 some.txt
o = 1
file = some.txt
```
Multiple values are still supported via value delimiters
```
$ prog -o=1,2 some.txt
o = 1, 2
file = some.txt
```
Relates to #546
Add the function `Arg.groups` that can take a `Vec<&'a str>` to add the `Arg` to multiple `ArgGroup`'s at once.
ex:
```rust
Arg::with_name("arg")
.groups(&["grp1", "grp2"])
```
Closes#426
In usage strings `[FLAGS]` and `[ARGS]` tags are now only added if there are relevant flags and
args to collapse. I.e. those that are
* Not required (`[ARGS]` only)
* Not belonging to some required group
* Excludes --help and --version (`[FLAGS]` only)
Closes#537
Previously, if one ran `<cmd> help help` an additional `help` subcommand was created and a help
message displayed for it. We *could* have just thrown an error `<cmd> help help` but I worry that
the message would be confusing, because something like, "Invalid Subcommand" isn't 100% correct as
the form `<cmd> help <subcmd>` is allowed, and there *is* a `help` subcmd.
This fix correct dispatches `<cmd> help help` to the `<cmd>` help message.
Closes#538
Prior to this fix, runnning `prog help subcmd` would produce:
```
subcmd
USGAE:
[...]
```
Notice lack of `prog-subcmd`. Whereas running `prog subcmd --help` produced:
```
prog-subcmd
USGAE:
[...]
```
These two forms now match the correct one (latter).
Closes#539
Now using `App::set_term_width` will set a wrapping width regardless of terminal size. This can
also be used when no terminal size can be determined (Such as on Windows). All help is now wrapped
at 120 if no terminal size has been specified, or can be determined.
Closes#451
This commit adds support for visible aliases, which function exactly like aliases except that they
also appear in the help message, using the help string of the aliased subcommand.
i.e.
```rust
App::new("myprog")
.subcommand(SubCommand::with_name("test")
.about("does testy things")
.alias("invisible")
.visible_alias("visible"));
```
When run with `myprog --help`, the output is:
```
myprog
USAGE:
myprog [FLAGS] [SUBCOMMAND]
FLAGS:
-h, --help Prints help information
-V, --version Prints version information
SUBCOMMANDS:
help Prints this message or the help of the given subcommand(s)
test|visible does testy things
```
Closes#522
One can now use `AppSettings::DontDelimitTrailingValues` to stop clap's default behavior of
delimiting values, even when `--` or `TrailingVarArg` is used. This is useful when passing other
flags and commands through to another program.
Closes#511
Instead of blindly printing `[ARGS]` when only a single positional arg is present, it will now
print `[NAME]` (or `[NAME]...` for multiple values allowed)
Closes#518
Color are now only used when outputting to a termainal/TTY. There are three new settings as well
which can be used to control color output, they are:
* `AppSettings::ColorAuto`: The default, and will only output color when outputting to a terminal or TTY
* `AppSettings::ColorAlways`: Outputs color no matter where the output is going
* `AppSettings::ColorNever`: Never colors output
This now allows one to use things like command line options, or environmental variables to turn
colored output on/off.
Closes#512
Allows adding a subcommand alias, which function as "hidden" subcommands that automatically
dispatch as if this subcommand was used. This is more efficient, and easier than creating
multiple hidden subcommands as one only needs to check for the existing of this command,
and not all vairants.
Example:
```
let m = App::new("myprog")
.subcommand(SubCommand::with_name("test")
.alias("do-stuff"))
.get_matches_from(vec!["myprog", "do-stuff"]);
assert_eq!(m.subcommand_name(), Some("test"));
```
Example using multiple aliases:
```
let m = App::new("myprog")
.subcommand(SubCommand::with_name("test")
.aliases(&["do-stuff", "do-tests", "tests"]))
.get_matches_from(vec!["myprog", "do-tests"]);
assert_eq!(m.subcommand_name(), Some("test"));
```
Closes#469
For example, if an arg is part of a required group, it will only appear
in the group usage string, and not in both the group as well as the arg
by itself.
Imagine a group containing two args, `arg1` and `--arg2`
OLD:
`myprog <arg1> <arg1|--arg2>`
NEW:
`myprog <arg1|--arg2>`
Closes#498
