#!/usr/bin/env bash

branch=$1

test -z "$branch" && echo "branch required." 1>&2 && exit 1

changes=$(git status --porcelain)

clean()
{
    git symbolic-ref HEAD "refs/heads/$branch"
    rm .git/index
    git clean -fdx
}

if [ -n "$changes" ]; then
    read -rp "All untracked changes will be lost. Continue [y/N]? " res
    case $res in
        [Yy]* ) ;;
        * ) exit 0;;
    esac
fi

clean