Re: _git Completion and custom commands

["Benjamin R. Haskell" <zsh@benizi.com>]

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On Tue, 28 Sep 2010, Conrad Irwin wrote:

> Hi Zsh,
>
> I finally got round to trying out zsh today, and wow is it cool — I 
> don't believe I've been stuck on bash for all this time :).
>
> The one issue I've found is that the _git completion function (as of 
> 4.3.10 shipped with Debian testing) does not include custom commands 
> (though it does include aliases).
>
> (For those of you unfamiliar with git, any executable in your path 
> with a name like git-* can be called as git * with no hyphen)
>
> My question is then: how would I add my custom commands' names to the 
> list already completed by _git (without completely overriding or 
> modifying the system-wide configuration)?

This has bothered me for a while, too.  I think _git should include 
these by default.  But, it's pretty easy to add:

zstyle ':completion:*:git:*' user-commands ${${(k)commands[(I)git-*]}#git-}

(I've found _git to be very about what it allows you to override via 
zstyles)

Explanation of the '${${(k)commands[(I)git-*]}#git-}' portion:

$commands is a built-in associative array that maps basenames to their 
full paths.

E.g. one of my custom git- commands that it picks up is:
commands[git-build-zsh]=/home/bhaskell/bin/git-build-zsh

So, we're looking for the keys '(k)'.  And we only want entries in the 
hash that have (I)ndexes matching 'git-*'.  Then we want to remove the 
leading 'git-' portion ( ${...#git-} ).

-- 
Best,
Ben

P.S. Played around a bit with (k), and [(MIRK)*], but couldn't seem to 
find a way to not repeat the 'git-' pattern.  I'm sure a veteran could 
do it effortlessly.

P.P.S. I found it a bit odd that:
print -l ${(<Tab>
completes glob qualifiers rather than parameter expansion flags.