set -u -e -o pipefail

BASEDIR=$(dirname "$0")

if [ $# -eq 0 ]; then

echo "Rebase github PR onto a branch"

echo

echo "$0 branch_to_rebase_on PR_NUMBER"

echo

exit 0

REBASE_ON="$1"

PR_NO="$2"

HEAD_LABEL=`curl -s https://api.github.com/repos/angular/angular/pulls/$PR_NO | node $BASEDIR/utils/json_extract.js head.label`

echo $HEAD_LABEL

IFS=':' read -r -a array <<< "$HEAD_LABEL"

USER="${array[0]}"

USER_GIT_URL="git@github.com:$USER/angular.git"

BRANCH="${array[1]}"

OLD_BRANCH=`git branch | grep \* | cut -d ' ' -f2`

echo =====================================================

echo Rebasing $USER_GIT_URL branch $BRANCH onto $REBASE_ON

echo =====================================================

git fetch $USER_GIT_URL $BRANCH

git co FETCH_HEAD

PUSH_CMD="git push $USER_GIT_URL HEAD:$BRANCH -f";

RESTORE_CMD="git co $OLD_BRANCH"

git rebase upstream/master

if [ $? -eq 0 ]; then

$PUSH_CMD

$RESTORE_CMD

echo ===========================

echo Git rebase failed. RECOVER WITH:

echo " $PUSH_CMD"

echo " $RESTORE_CMD"

echo ===========================