bash: support 'git notes' and its subcommands

... and it will offer refs unless after -m or -F, because these two
options require a non-ref argument.

Signed-off-by: SZEDER Gábor <szeder@ira.uka.de>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/completion/git-completion.bash

@@ -1306,6 +1306,24 @@ _git_name_rev ()
 	__gitcomp "--tags --all --stdin"
 }
 
+_git_notes ()
+{
+	local subcommands="edit show"
+	if [ -z "$(__git_find_on_cmdline "$subcommands")" ]; then
+		__gitcomp "$subcommands"
+		return
+	fi
+
+	case "${COMP_WORDS[COMP_CWORD-1]}" in
+	-m|-F)
+		COMPREPLY=()
+		;;
+	*)
+		__gitcomp "$(__git_refs)"
+		;;
+	esac
+}
+
 _git_pull ()
 {
 	__git_complete_strategy && return
@@ -2218,6 +2236,7 @@ _git ()
 	merge-base)  _git_merge_base ;;
 	mv)          _git_mv ;;
 	name-rev)    _git_name_rev ;;
+	notes)       _git_notes ;;
 	pull)        _git_pull ;;
 	push)        _git_push ;;
 	rebase)      _git_rebase ;;