#!/bin/sh
# Copyright (C) 2021 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

usage()
{
    echo "Usage: $0 <path/to/manifest/repository> <remote> <patterns>"
    exit 1
}

print_header()
{
    string="$1"
    str_len="$(expr $(echo ${string} | wc -c) - 1)"
    spaces=1

    printf "%s%${spaces}s" "${string}"
    printf "%$(expr 80 - ${str_len} - ${spaces})s\n"  | tr " " "-"
}

print_footer()
{
    # Prints 80 '-'
    printf "%80s\n" | tr " " "-"
}

grep_all_tags()
{
    repository="$1"
    patterns="$2"

    for tag in $(git -C ${repository} tag) ; do
        print_header "tag: ${tag}"
        git -C "${repository}" grep "${patterns}"
        print_footer
    done
}

grep_all_branches()
{
    repository="$1"
    remote="$2"
    patterns="$3"

    for branch in $(git -C "${repository}" branch -a --list "${remote}/*" | \
			sed "s#^  remotes/${remote}/##" | \
			grep -v ".* \-> .*") ; do
	print_header "branch: ${branch}"
	git -C "${repository}" grep "${patterns}" "${remote}/${branch}"
	print_footer
    done
}

if [ $# -ne 3 ] ; then
    usage
fi

repository="$1"
# Force the user to use a remote to avoid accidentaly thinking
# that everything is ok if the origin remote isn't the same.
remote="$2"
patterns="$3"

grep_all_tags "${repository}" "${patterns}"
grep_all_branches "${repository}" "${remote}" "${patterns}"