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#!/usr/bin/python3

# maildir-import-patch -- import a git patch series into a maildir

# Copyright (C) 2019 Sean Whitton
#
# 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
import sys
import mailbox
import shutil
import subprocess
import tempfile

def eprint(*args, **kwargs):
    print(*args, file=sys.stderr, **kwargs)

us = os.path.basename(sys.argv[0])

if len(sys.argv) < 2:
    eprint(us + ": usage: " + us + " MAILDIR [git-format-patch(1) args]")
    sys.exit(1)

if not shutil.which("git"):
    eprint(us + ": this script requires git to be installed")
    sys.exit(1)

dest_path = sys.argv[1]
dest = mailbox.Maildir(dest_path)

cmd = [
    "git", "format-patch",
    "--thread=shallow", "--no-cc", "--no-to",
    "--stdout",
]
user_args = sys.argv[2:]

with tempfile.NamedTemporaryFile() as fp:
    subprocess.run(cmd + user_args, stdout=fp)
    source = mailbox.mbox(fp.name)
    dest.lock()
    for message in source:
        dest.add(message)
    dest.close()