# -*- coding: utf-8 -*-
#
# Copyright © 2012 - 2019 Michal Čihař <michal@cihar.com>
#
# This file is part of Weblate <https://weblate.org/>
#
# This program is free 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.
#
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
#

import os.path
import subprocess

GIT_PATHS = [
    '/usr/lib/git',
    '/usr/lib/git-core',
    '/usr/libexec/git',
    '/usr/libexec/git-core',
]


def find_git_http_backend():
    """Find git http backend"""

    if hasattr(find_git_http_backend, 'result'):
        return find_git_http_backend.result

    try:
        path = subprocess.check_output(
            ['git', '--exec-path']
        ).decode('utf-8').strip()
        if path:
            GIT_PATHS.insert(0, path)
    except OSError:
        pass

    for path in GIT_PATHS:
        name = os.path.join(path, 'git-http-backend')
        if os.path.exists(name):
            find_git_http_backend.result = name
            return name
    return None
