bash completion: add diff options

I use "git diff" (the porcelain) really often, and am almost as often
annoyed that the completions do not know how to complete something simple
as --cached.  Now they do.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 599b2fc5711bf6022fdb635b08baac16068de7dd..58e0e53cd6f6382e9665d20b53b26cd1da42fc88 100755 (executable)
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -551,6 +551,20 @@ _git_describe ()
 
 _git_diff ()
 {
+       local cur="${COMP_WORDS[COMP_CWORD]}"
+       case "$cur" in
+       --*)
+               __gitcomp "--cached --stat --numstat --shortstat --summary
+                       --patch-with-stat --name-only --name-status --color
+                       --no-color --color-words --no-renames --check
+                       --full-index --binary --abbrev --diff-filter
+                       --find-copies-harder --pickaxe-all --pickaxe-regex
+                       --text --ignore-space-at-eol --ignore-space-change
+                       --ignore-all-space --exit-code --quiet --ext-diff
+                       --no-ext-diff"
+               return
+               ;;
+       esac
        __git_complete_file
 }