completion: support `git range-diff`

Tab completion of `git range-diff` is very convenient, especially
given that the revision arguments to specify the commit ranges to
compare are typically more complex than, say, what is normally passed
to `git log`.

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 94c95516ebec7f32787cc5a2fb45cae83c7e28e3..3d4ec34323e871428a2966e8e5cc9b74e1194c9c 100644 (file)
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -1976,6 +1976,20 @@ _git_push ()
        __git_complete_remote_or_refspec
 }
 
+_git_range_diff ()
+{
+       case "$cur" in
+       --*)
+               __gitcomp "
+                       --creation-factor= --dual-color
+                       $__git_diff_common_options
+               "
+               return
+               ;;
+       esac
+       __git_complete_revlist
+}
+
 _git_rebase ()
 {
        __git_find_repo_path