#!/bin/sh

if [ "$1" == "-l" ]
then
	ls .git/refs/heads
elif [ "x$1" != "x" ]
then
	if [ ! -f .git/refs/heads/$1 ]
	then
		echo Branch $1 not found.
		exit 1
	fi
	diff=$(git-diff-cache -r -p HEAD)
	if [ "x$diff" != "x" ]
	then
		echo "Commit pending changes first"
		exit 1
	fi
	( cd .git && rm -f HEAD && ln -s refs/heads/$1 HEAD )

	git-read-tree -m HEAD && git-checkout-cache -q -f -u -a
else
	readlink .git/HEAD
fi