#!/usr/bin/env bash
#=============================================================================
# Copyright 2010-2015 Kitware, Inc.
#
# 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
#
# 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"

#-----------------------------------------------------------------------------

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

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

# 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