#!/usr/pkg/bin/python3.13
# -*- coding: utf-8 -*-
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# Copyright (C) 2015-2025 Sérgio Basto <sergio@serjux.com>
#
# 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 2 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# patchview-wrapper - wrapper for Git/SVN commands (e.g., "git diff",
# "git show", "svn diff") piped into patchview, optionally also piped into
# an editor

# Note: gitdiff, gitdiffview, gitshow, gitshowview, svndiff, svndiffview
# are symbolic links pointing to this wrapper.
# They are automatically created by Makefile.am.

import os
import sys
import argparse
from subprocess import Popen, PIPE

enviro = os.environ
workdir = '.'
editor = os.environ.get("EDITOR", "vim")

tools = ["git", "svn"]
prog = os.path.basename(sys.argv[0])

tool = None
for t in tools:
    if prog.startswith(t):
        tool = t
        break

if tool is None:
    sys.stderr.write(f"Error: program name must start with one of {tools} (got '{prog}')\n")
    sys.exit(1)

tool_cmd = prog[len(tool):]

parser = argparse.ArgumentParser()
parser.add_argument('-v', '--debug',
                    help='writes the commands that will be executed',
                    action='store_true')
parser.add_argument('tool_args', nargs='*', default=[])
parser.add_argument('patchview_args', nargs=argparse.REMAINDER)
args, unknown = parser.parse_known_args()
tool_args = args.tool_args
patchview_args = args.patchview_args + unknown

pipetoview = tool_cmd.endswith("view")
if pipetoview:
    tool_cmd = tool_cmd[:-4]
    patchview_cmd = ["filterdiff"] + patchview_args
else:
    patchview_cmd = ["patchview"] + patchview_args

vcs_cmd = [tool, tool_cmd] + tool_args
dest_cmd = [editor, "-R", "-"]

if args.debug:
    debug_str = "%s | %s" % (" ".join(vcs_cmd), " ".join(patchview_cmd))
    if pipetoview:
        debug_str += " | %s" % " ".join(dest_cmd)
    sys.stderr.buffer.write((debug_str + "\n").encode())
    sys.stderr.flush()

p1 = Popen(vcs_cmd, stdout=PIPE, env=enviro, cwd=workdir)
p2 = Popen(patchview_cmd, stdin=p1.stdout, stdout=PIPE, env=enviro, cwd=workdir)

stdout2, _ = p2.communicate()
ret2 = p2.returncode
if ret2 != 0:
    if stdout2:
        sys.stdout.buffer.write(stdout2)
    sys.exit(ret2)

p1.wait()
ret1 = p1.returncode
if ret1 != 0:
    sys.exit(ret1)

if pipetoview:
    p3 = Popen(dest_cmd, stdin=PIPE, env=enviro, cwd=workdir)
    stdout3, _ = p3.communicate(stdout2)
else:
    sys.stdout.buffer.write(stdout2)

