#!/usr/bin/env bash
#=============================================================================
# Copyright 2010-2012 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
#
#     https://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"

# Load the project configuration.
config="${BASH_SOURCE%/*}/config" &&
upstream_remote=$(git config -f "$config" --get upstream.remote) &&
host=$(git config -f "$config" --get github.host || echo "github.com") &&
organization_name=$(git config -f "$config" --get github.organization-name) &&
repo_name=$(git config -f "$config" --get github.repo-name)
github_remote=$(git config --get github.fork.remote)
#-----------------------------------------------------------------------------

remote="$github_remote"
refspecs=''
no_topic=''
dry_run=''
force=''

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

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

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 "$topic" = "master"; then
    die 'Please name your topic:
    git checkout -b descriptive-name'
  fi
  refspecs="HEAD:$topic"
fi

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

# Fetch the current upstream master branch head.
# This helps the computation of a minimal pack to push.
if test -z "$upstream_remote"; then
  echo "Fetching $upstream_remote master"
  fetch_out=$(git fetch "$upstream_remote" master 2>&1) || die "$fetch_out"
fi

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

# Reproduce the push exit code.
exit $push_exit