#!/bin/sh

Usage()
{
    cat <<__USAGE__
Usage:	git-empty-branch -h|--help
	git-empty-branch [-m|--message "<message>"] branch ...
__USAGE__
}

MESSAGE="Empty branch"

if [ $# -eq 0 ]; then
    Usage >&2
    exit 1
fi

BRANCHES=
NOCOMMIT=

while [ $# -ne 0 ]; do
    case $1 in
	--)
	    shift
	    BRANCHES="$BRANCHES $@"
	    ;;
	-h|--help)
	    Usage
	    exit 0
	    ;;
	-m|--message)
	    MESSAGE=$2
	    shift 2
	    ;;
	-n|--no-commit)
	    NOCOMMIT=1
	    shift
	    ;;
	*)
	    BRANCHES="$BRANCHES $1"
	    shift
	    ;;
    esac
done

for B in $BRANCHES; do
    if [ -d .git/refs/heads/$B ]; then
	echo "branch $B already exists!" >&2
    else
	git stash
	git symbolic-ref HEAD refs/heads/$B
	rm .git/index
	git clean -f -d
	[ -z "$NOCOMMIT" ] || exit 0
	git commit --allow-empty -m "$MESSAGE"
    fi
done