#!/usr/bin/env bash

set -eu

if [  -z "${1-}" ] ; then
    echo "mr number or URL required. See --help for usage." 1>&2
    exit 1
fi

if test "$1" = "clean"; then
  git for-each-ref refs/heads/mr/* --format='%(refname)' | while read ref; do
    git branch -D ${ref#refs/heads/}
  done
  exit 0
elif [[ $1 =~ ^(https?://[^/]+/(.+))/merge_requests/([0-9]+).*$ ]]; then
  remote=${BASH_REMATCH[1]}.git
  id=${BASH_REMATCH[3]}
else
  id=$1
  remote=${2:-origin}
fi

branch=mr/$id
remote_ref=refs/merge-requests/$id/head
git fetch -fu $remote $remote_ref:$branch
git checkout $branch
git config --local --replace branch.$branch.merge $remote_ref
git config --local --replace branch.$branch.remote $remote