use -V for version instead of -v

[kbknapp]

In order to follow typical conventions where lowercase -v is for verbose and many programs use the capital -V for version (to include rustc). Currently, if one wants to use typical -v for verbose, that leaves only the long for version with no option to "add" a short without manually implementing it (which isn't hard...but still).

There are two options for this:

1. Simply change default short of version to -V which is a "breaking" change (at least for downstream documentation).
2. Use short -v for version unless manually overridden, then use short -V if available.

I like option 2 because it's a non-breaking change, the downside is it could be confusing if a program suddenly changes from -v to -V for version seemingly automagically. Or when subcommands have one -v but parents or other subcommands have -V....so maybe I actually prefer option 1.

TBD

[kbknapp]

-V is now the default. In order to stay more in line with other standard command line interfaces.

I have added App::version_short() and App::help_short() which allow you to override this default (and set it to anything you like).

[JimLynchCodes]

@kbknapp honestly, I don't like this change.

Many popular cli tools (for example, npm) use the lower case -v for the version short flag.

The App::version_short() is cool, but I'm still not sure how to actually use it with the Clap derive syntax... also, what if you want to allow both -v and -V for short version flag?

[epage]

imo -v is more generally recognized as --verbose and we do allow customizing it, so not too concerned about some tools using -v for --version.

App::version_short was more of a v2 way of customizing it.

The way to do this in clap today is something like:

#[derive(Parser)]
#[command(disable_version_flag = true)]
struct {
    /// Print version
    #[arg(short = 'v', short_alias = 'V', long, action = clap::builder::ArgAction::Version)]
    version: (),
}

[fawdlstty]

Can we change the version retrieval method to lowercase? Verbose is not something everyone needs, but uppercase input is difficult, using lowercase to obtain the version is more reasonable

[epage]

At this point, someone would need to put forward a strong case for changing the default. As shown above, people are free to change this for their application as they wish.