When supporting multiple occurrences for positional arguments in #2804,
I added some tests to cover this but apparently simpler cases fail
despite those more complicated cases being tested.
This adds more multiple-occurrences tests for positional arguments,
fixes them, and in general equates multiple values with occurrences for
positional arguments as part of #2692. There are a couple more points
for consideration for #2692 for us to decide on once this unblocks them
(usage special case in #2977 and how subcommand help should be handled).
I fully admit I have not fully quantified the impact of all of these
changes and am heavily relying on the quality of our tests to carry this
forward.
In considering potential work for #2683, I realized we might need a type to carry data for
each of the `multiple_values`. `ArgValue` works both for that and for
possible values, so we need to come up with a better name for one or
both. Changing `ArgValue`s name now would be ideal since its new in
clap3 and by renaming it, we can reduce churn for users.
While thinking about this, I realized I regularly get these mixed
up, so renaming `ArgValue` to `PossibleValue` I think will help clear
things up, regardless of #2683.
Who knew people need to ask `help` for how to use `help`?
While auditing `MultpleValues`, I saw commented out code. Looks
its commit (f230cfedc) was part of a large refactor and updating that
part fell through the cracks. Just simply updating it didn't quite get
it to work. The advantage of this approach is it gets us closer to how
clap works on its own.
In clap 2.33.3, `cmd help help` looks like
```
myapp-help
Prints this message or the help of the given subcommand(s)
USAGE:
test-clap help [subcommand]...
ARGS:
<subcommand>... The subcommand whose help message to display
```
But clap3 master looks like:
```
myapp
USAGE:
myapp [SUBCOMMAND]
OPTIONS:
-h, --help Print custom help about text
SUBCOMMANDS:
help Print this message or the help of the given subcommand(s)
subcmd
```
This change improves it to:
```
myapp-help
Print this message or the help of the given subcommand(s)
USAGE:
myapp help [SUBCOMMAND]...
ARGS:
<SUBCOMMAND>... The subcommand whose help message to display
OPTIONS:
-h, --help Print custom help about text
```
We still have global arguments showing up (like `-h`) that will error but its
an improvement! In general, I'd like to find a way to leverage clap's stanard
behavior for implementing this so we don't have to worry about any of these
corner cases in the future.
Note: compared to clap2, I changed `<subcommand>` to `<SUBCOMMAND>` because I
believe the standard convention is for value names to be all caps (e.g.
`clap_derive` has been updated to default to that).
PR #1211 originally added `help_heading` with the current priority
(`App::help_heading` wins).
In #1958, the author had proposed to change this
> Note that I made the existing arg's heading a priority over the one in App::help_heading
This was reverted on reviewer request because
> Thanks for the priority explanation. Yes, please make the app's help
> heading a priority. I can see how it would be useful when people might
> want to reuse args.
Re-using args is an important use case but this makes life difficult
for anyone using `help_heading` with `clap_derive` because the user
can only call `App::help_heading` once per struct. Derive users can't get
per-field granularity with `App::help_heading` like the builder API.
As a bonus, I think this will be the least surpising to users. Users
generally expect the more generic specification (App) to be overridden by the
more specific specification (Arg). Honestly, I had thought this PR is
how `help_heading` worked until I dug into the code with #2872.
In the argument re-use cases, a workaround is for the reusable arguments
to **not** set their help_heading and require the caller to set it as
needed.
Fixes#2873
2871: Better positional checks r=epage a=pksunkara
2872: Iterate on help_heading to prepare for derive support r=pksunkara a=epage
2876: Generate/bash: add possible_values to completion when available r=pksunkara a=nstinus
Co-authored-by: Pavan Kumar Sunkara <pavan.sss1991@gmail.com>
Co-authored-by: Ed Page <eopage@gmail.com>
Co-authored-by: Nicolas Stinus <nstinus@latourtrading.com>
In part, this is just fixing a papercut where someone will try to use
the API in the same way between the two but it fails and they'll have to
consult the docs / rust-analyzer.
The bigger reason is that this is more derive-friendly for dealing with #2803
since we will be able to just ask for the current help heading
before running the app and then restore it back, rather than having to
conditionalize the revert logic.
For those that want the original behavior, you can usxe
`arg.help_heading(Some("FLAGS"))` on your flags. Limitations:
- This will not give you a special sort order
- This will not get a `[FLAGS]` added to usage
For templates, we removed `{unified}` and `{flags}`. To help people
catch these, a debug_assert was added.
I'm unsure but I think there might be a change in behavior in calcuating
when to show `[OPTION]` in usage. The old code only looked at
`required` while flags looked only at arg groups. We now look at both.
Ideally we'd add these in `_build` and remove special casing for
no-groups except in the sort order of groups. I feel like thats best
left for later.
This also reduced the scope of `App`s public API.
`get_*_with_no_heading` seemed a bit specialized to be in the public
API. #2853 looks at splitting it out into its own PR.
BREAKING CHANGE: Multiple
- `UnifiedHelpMessage` removed
- `{flags}` and `{unified}` are removed and will assert when present.
- `get_*_with_no_heading` removed
Fixes#2807
This was changed in #1989 without an explanation:
- In the help template, there isn't a way to expose with help_headings,
so show all.
- In usage, we don't know whether the user wants to see `[FLAGS]` /
`[OPTIONS]` or not, so let's default to showing them.
* Check for `DisableHelpFlag` along with `NoAutoHelp`
Also applies for `DisableHelpSubcommand` and `DisableVersionFlag` with `NoAutoVersion`
* Add tests for overriding help and version, and disabling version.
These override by disabling the default and adding a new one.
* Don't use `default_missing_value` for `override_version_using_short`
* Check errors by the API.
This changes the `disabled_version_long` and `disabled_version_short` tests.
This is opposed to comparing the stderr output.
* feat(arg_value): ArgValue can be used for possible_values
Through the ArgValue it is possible:
* `hide` possible_values from showing in completion, help and validation
* add `about` to possible_values in completion
* Resolved a few change-requests by epage
* make clippy happy
* add ArgValue::get_visible_value
* remove verbose destructering
* rename ArgValue::get_hidden to ArgValue::is_hidden
* add test for help output of hidden ArgValues
* Documentation for ArgValue
There is an issue that required to implement From<&ArgValue> for
ArgValue. We should probably find a solution without that.
* fix requested changes by epage
* fix formatting
* add deref in possible_values call to remove From<&&str>
* make clippy happy
* use copied() instad of map(|v|*v)
* Finishing up for merge, hopefully
* changes requested by pksunkara
* Don't suggest `help` or `--help` when not applicable
* Apply suggestions from code review
Co-authored-by: Pavan Kumar Sunkara <pavan.sss1991@gmail.com>
* Update test usage to match intended
Co-authored-by: Pavan Kumar Sunkara <pavan.sss1991@gmail.com>
Change default help template:
- The new template introduce new lines before and after
author/about sections.
- Add help template placeholders:
- about-section
- author-section
- Documentation of new placeholders in clap::App::help_template
- Update all unit tests by incorporating new lines
