docs(README.md): fix some typos
This is the first time i make a pull request. I hope i have done things right.
I love clap-rs very much. Thank you for your hard work.
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/kbknapp/clap-rs/938)
<!-- Reviewable:end -->
One can now use `App::long_version` to dsiplay a different (presumably
longer) message when `--version` is called. This commit also adds the
corresponding print/write long version methods of `App`
One can now use `App::print_long_help` or `App::write_long_help`
Note that `App::write_long_help` is **NOT** affected by kbknapp/clap-rs#808 in the manner
that `App::write_help` help is and thus should be preferred if at all possible.
One can now use `Arg::long_help` which will be displayed when the user
runs `--help`. This is typically longer form content and will be
displayed using the NextLineHelp methodology.
If one specifies the standard `Arg::help` it will be displayed when the
user runs `-h` (by default, unless the help short has been overridden).
The help text will be displayed in the typical clap fashion.
The help format requested (-h/short or --help/long) will be the
*default* displayed. Meaning, if one runs `--help` (long) but only an
`Arg::help` has been provided, the message from `Arg::help` will be
used. Likewise, if one requests `-h` (short) but only
`Arg::long_help` was provided, `Arg::long_help` will be displayed appropriately
wrapped and aligned.
Completion script generation *only* uses `Arg::help` in order to be
concise.
cc @BurntSushi thanks for the idea!
One should be able to override the auto generated help and version flags
by simply providing an arg with a long of `help` or `version`
respectively. This bug was preventing that from happening.
However, now that it's fixed if one was relying on adding an arg with a
long of `help` or `version` and using `get_matches_safe` to produce the
`ErrorKind::HelpDisplayed` or `ErrorKind::VersionDisplayed` errors they
**WILL NOT** happen anymore.
This is because the bug was causing those "errors" to occur (i.e. the
help or version message to be displayed). The "fix" to get that
functionality back is to either:
* Remove the arg with the long of `help` or `version`
* Use `ArgMatches::is_present` instead of `App::get_matches_safe` to check for the presence of your custom help or version flag
Option 1 is the easiest provided one wasn't using said arg to *also*
override other aspects of the flags as well (short, help message, etc.)
Even though this may break some code, as per the compatibility policy
listed in the readme; code that breaks due to relying on a bug does
*not* constitute a major version bump. I will however be bumping the
minor version instead of just the patch version. I will also be
searching for, contacting, and attempting to submit PRs to any affected
projects prior to releasing the next version to crates.io
Closes#922
