completion: support excluding refs

Allow completion of refs with a ^ prefix. This allows completion of
commands like 'git log HEAD ^origin/master'.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index bd25b0a..eb8a3d4 100644 (file)
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -338,7 +338,7 @@ __git_tags ()
 __git_refs ()
 {
        local i hash dir="$(__gitdir "${1-}")" track="${2-}"
-       local format refs
+       local format refs pfx
        if [ -d "$dir" ]; then
                case "$cur" in
                refs|refs/*)
@@ -347,14 +347,15 @@ __git_refs ()
                        track=""
                        ;;
                *)
+                       [[ "$cur" == ^* ]] && pfx="^"
                        for i in HEAD FETCH_HEAD ORIG_HEAD MERGE_HEAD; do
-                               if [ -e "$dir/$i" ]; then echo $i; fi
+                               if [ -e "$dir/$i" ]; then echo $pfx$i; fi
                        done
                        format="refname:short"
                        refs="refs/tags refs/heads refs/remotes"
                        ;;
                esac
-               git --git-dir="$dir" for-each-ref --format="%($format)" \
+               git --git-dir="$dir" for-each-ref --format="$pfx%($format)" \
                        $refs
                if [ -n "$track" ]; then
                        # employ the heuristic used by git checkout