_gitbmerge() {
	local cur prev
	_init_completion || return
	[ $COMP_CWORD -gt 1 ] &&  return # Complete only single dependency
	COMPREPLY=()
	local GDIR="$(pwd)"
	while [ ! -d "$GDIR/.git"  ]; do
		[ -z "$GDIR" ] && return
		GDIR="${GDIR%/*}"
	done
	GDIR="$GDIR/.git"
	[ -f "$GDIR" ] && GDIR="$(cat "$GDIR")" # This just points to some other directory
	[ -d "$GDIR/refs/heads" ] || return # No completion if there is no local branch
	local ops=""
	for B in "$GDIR"/refs/heads/*; do
		# TODO skip branch on HEAD
		ops="$ops ${B#$GDIR/refs/heads/}"
	done
	COMPREPLY+=($(compgen -W "${ops}" -- ${cur}))
}
complete -F _gitbmerge gitbmerge