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
Using `App::get_matches` from the integration tests meant that any
CLI arguments passed to libtest would also be captured by clap, often
causing the tests to fail.
For example, running `cargo test --test help -- --nocapture` would
result in several failed tests, even though `cargo test --test help`
worked fine. This was very surprising/confusing.
This commit makes the tests no longer implicitly rely on the value of
`env::args_os()`, which means developers can now provide arguments to
libtest without failures.
1612: Use about() with help() and long_about() with long_help() r=pksunkara a=TheLostLambda
I was going through the clap documentation and was under the impression that calling `help()` would call `about()` and `long_help()` would call `long_about()`, but I've actually discovered this not to be the case. Instead, the `long_about()` was always shown when it existed, rendering the output (in the about section) of programs called with `-h` and `--help` identical. Issue #1472 shows this and that is fixed here.
Note this doesn't remove the ability to use the same about in both cases: if `long_about()` is unset, then `about()` is used in both cases.
I've changed the implementation here to use `is_some()` and `unwrap()` as opposed to `if let` because it ultimately allows for less repetitive code. Ideally, I'd be able to pair `if let` with a secondary condition (namely `self.use_long`), but to my dismay, let-chains are not stabilized yet.
For a second opinion, here is the code a settled on:
```
if self.use_long && parser.meta.long_about.is_some() {
debugln!("Help::write_default_help: writing long about");
write_thing!(parser.meta.long_about.unwrap())
} else if parser.meta.about.is_some() {
debugln!("Help::write_default_help: writing about");
write_thing!(parser.meta.about.unwrap())
}
```
Here is the alternative:
```
if self.use_long {
if let Some(about) = parser.meta.long_about {
debugln!("Help::write_default_help: writing long about");
write_thing!(about)
} else if let Some(about) = parser.meta.about {
debugln!("Help::write_default_help: writing about");
write_thing!(about)
}
} else {
if let Some(about) = parser.meta.about {
debugln!("Help::write_default_help: writing about");
write_thing!(about)
}
}
```
Co-authored-by: Brooks J Rady <b.j.rady@gmail.com>
> incidentally, how do we feel about adding a rustfmt check to the CI(s)?
yes we should be doing that. you can send another pr that adds the check to the Ci
