#!/bin/sh
# Based on https://gist.github.com/gnarf/5406589

if test "$1" = "clean"; then
  git for-each-ref refs/heads/pr/* --format='%(refname)' | while read ref; do
    git branch -D ${ref#refs/heads/}
  done
else
  test -z $1 && echo "pr number required." 1>&2 && exit 1
  git fetch -fu ${2:-origin} refs/pull/$1/head:pr/$1 && git checkout pr/$1
fi