#!/bin/sh
# git-empty-branch [branch]

if [ $# -eq 1 ]; then
    branch=$1
else
    echo "Usage: $0 [branch]" >&2
    exit 1
fi

if [ -n "$(git show-ref --heads $branch)" ]; then
    echo "branch already exists" >&2
    exit 1
fi

git symbolic-ref HEAD refs/heads/$branch && \
	rm .git/index && git clean -fdx && \
	echo "Now on empty branch $branch" || \
	fail
exit 0

fail()
{
    echo "Branch failure.  You may need to git reset --hard" >&2
    exit 1
}