completion: fix PS1 display during an AM on detached HEAD

This is a companion patch to previous 8763dbb (completion: fix PS1 display
during a merge on detached HEAD, 2009-05-16).  While rebasing or running am
on a detached HEAD, the code failed to set $b (branch description) that
enables the whole status display business.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 0c8bb53..c84d765 100755 (executable)
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -84,26 +84,24 @@ __git_ps1 ()
        if [ -n "$g" ]; then
                local r
                local b
-               if [ -d "$g/rebase-apply" ]; then
-                       if [ -f "$g/rebase-apply/rebasing" ]; then
-                               r="|REBASE"
-               elif [ -f "$g/rebase-apply/applying" ]; then
-                               r="|AM"
-                       else
-                               r="|AM/REBASE"
-                       fi
-                       b="$(git symbolic-ref HEAD 2>/dev/null)"
-               elif [ -f "$g/rebase-merge/interactive" ]; then
+               if [ -f "$g/rebase-merge/interactive" ]; then
                        r="|REBASE-i"
                        b="$(cat "$g/rebase-merge/head-name")"
                elif [ -d "$g/rebase-merge" ]; then
                        r="|REBASE-m"
                        b="$(cat "$g/rebase-merge/head-name")"
                else
-                       if [ -f "$g/MERGE_HEAD" ]; then
+                       if [ -d "$g/rebase-apply" ]; then
+                               if [ -f "$g/rebase-apply/rebasing" ]; then
+                                       r="|REBASE"
+                               elif [ -f "$g/rebase-apply/applying" ]; then
+                                       r="|AM"
+                               else
+                                       r="|AM/REBASE"
+                               fi
+                       elif [ -f "$g/MERGE_HEAD" ]; then
                                r="|MERGING"
-                       fi
-                       if [ -f "$g/BISECT_LOG" ]; then
+                       elif [ -f "$g/BISECT_LOG" ]; then
                                r="|BISECTING"
                        fi