git-jump: invoke emacs/emacsclient

It works with GIT_EDITOR="emacs", "emacsclient" or "emacsclient -t"

Signed-off-by: Yoichi Nakayama <yoichi.nakayama@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/git-jump/git-jump

@@ -23,7 +23,22 @@ EOF
 
 open_editor() {
 	editor=`git var GIT_EDITOR`
-	eval "$editor -q \$1"
+	case "$editor" in
+	*emacs*)
+		# Supported editor values are:
+		# - emacs
+		# - emacsclient
+		# - emacsclient -t
+		#
+		# Wait for completion of the asynchronously executed process
+		# to avoid race conditions in case of "emacsclient".
+		eval "$editor --eval \"(let ((buf (grep \\\"cat \$1\\\"))) (pop-to-buffer buf) (select-frame-set-input-focus (selected-frame)) (while (get-buffer-process buf) (sleep-for 0.1)))\""
+		;;
+	*)
+		# assume anything else is vi-compatible
+		eval "$editor -q \$1"
+		;;
+	esac
 }
 
 mode_diff() {