#!/usr/bin/env bash
#==========================================================================
#
#   Copyright Insight Software Consortium
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#          http://www.apache.org/licenses/LICENSE-2.0.txt
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.
#
#==========================================================================*/

USAGE="[<remote>] [--no-topic] [--dry-run] [--]"
OPTIONS_SPEC=
SUBDIRECTORY_OK=Yes
. "$(git --exec-path)/git-sh-setup"

egrep-q() {
  egrep "$@" >/dev/null 2>/dev/null
}

remote=''
refspecs=''
no_topic=''
dry_run=''

# Parse command line options.
while test $# != 0; do
  case "$1" in
    --no-topic)  no_topic=1 ;;
    --dry-run)   dry_run=--dry-run ;;
    --) shift; break ;;
    -*) usage ;;
    *) test -z "$remote" || usage ; remote="$1" ;;
  esac
  shift
done
test $# = 0 || usage

# Default remote.
test -n "$remote" || remote="gerrit"

if test -z "$no_topic"; then
  # Identify and validate the topic branch name.
  topic="$(git symbolic-ref HEAD | sed -e 's|^refs/heads/||')"
  if test "$topic" = "master"; then
    die 'Please name your topic:
  git checkout -b descriptive-name'
  fi
  # The topic branch will be pushed by name.
  refspecs="HEAD:refs/for/master/$topic $refspecs"
fi

# Fetch the current upstream master branch head.
# This helps computation of a minimal pack to push.
echo "Fetching $remote master"
fetch_out=$(git fetch "$remote" master 2>&1) || die "$fetch_out"
master=$(git rev-parse FETCH_HEAD) || exit

# Exit early if we have nothing to push.
if test -z "$refspecs"; then
  echo 'Nothing to push!'
  exit 0
fi

# Push.  Save output and exit code.
echo "Pushing to $remote"
push_stdout=$(git push --porcelain $dry_run "$remote" $refspecs); push_exit=$?
echo "$push_stdout"

# Reproduce the push exit code.
exit $push_exit
