PATCH: Fall back to file completion if nothing else works

[Frank Terbeck <ft@xxxxxxxxxxxxxxxxxxx>]

Some people have for third party add-ons to git. `annex' is one such
add-on. Currently "git annex add <tab>" does nothing, because there is
no special subcommand handling function.

_git should really fallback to file name completion in such cases. This
patch does exactly that.

I'm wondering how we should handle third party add ons to commands. _git
used provide the `user-commands' style to do stuff like this:

    % zstyle ':completion:*:*:git:*' user-commands foo:'description for foo'

You could even define `_git-foo()' to have special handling.

In fact, the current _git still mentions that in the `user-commands'
style. But the actual code is gone since the major update. I think it
should be re-added for backward compatibility.

`user-commands' is really only useful for user-specific add-ons. We
might also want to invent something so third party add-ons (which might
be distributed separately from git) could drop a _git-foo file into
$fpath to get special completion for "git fo<tab>" and "git foo <tab>".

Thoughts?
---
 Completion/Unix/Command/_git |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/Completion/Unix/Command/_git b/Completion/Unix/Command/_git
index e062705..2b8b8d6 100644
--- a/Completion/Unix/Command/_git
+++ b/Completion/Unix/Command/_git
@@ -6024,6 +6024,10 @@ _git() {
         curcontext=${curcontext%:*:*}:git-$words[1]:
 
         _call_function ret _git-$words[1]
+        if (( ? != 0 )); then
+            _path_files
+            ret=$?
+        fi
         ;;
     esac
   else
-- 
1.7.5