#!/bin/bash

#   Copyright © 2016 Zetok Zalbavar <zetok@openmailbox.org>
#   Copyright © 2019 by The qTox Project Contributors
#
#   This file is part of qTox, a Qt-based graphical interface for Tox.
#   qTox is libre software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   qTox is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with qTox.  If not, see <http://www.gnu.org/licenses/>

# Script for merging pull requests. Works only when there are no merge
# conflicts. Assumes that working dir is a qTox git repo.
#
# Requires SSH key that github accepts and GPG set to sign merge commits.

# usage:
#   ./$script $pr_number $optional_message
#
#
# $pr_number – number of the PR as shown on GH
# $optional_message – message that is going to be put in merge commit,
#       before the appended shortlog.
#

set -e -o pipefail

readonly PR="${1###}"

# make sure to add newlines to the message, otherwise merge message
# will not look well
if [[ ! -z $2 ]]
then
    readonly OPT_MSG="
$2
"
fi

source_functions() {
    local fns_file="tools/lib/PR_bash.source"
    source $fns_file
}

main() {
    local remote_name="upstream"
    local merge_branch="merge"
    local base_branch # because assigning on the same line will break error code parsing.. http://www.tldp.org/LDP/abs/html/localvar.html
    base_branch=$(git symbolic-ref HEAD --short)

    source_functions
    exit_if_not_pr $PR
    add_remote
    get_sources

    merge git merge -S \
        && after_merge_msg $merge_branch \
        || after_merge_failure_msg $merge_branch
}
main