dulwich/dulwich/cli.py

#
# dulwich - Simple command-line interface to Dulwich
# Copyright (C) 2008-2011 Jelmer Vernooij <jelmer@jelmer.uk>
# vim: expandtab
#
# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
# Dulwich is dual-licensed under the Apache License, Version 2.0 and the GNU
# General Public License as public by the Free Software Foundation; version 2.0
# or (at your option) any later version. You can redistribute it and/or
# modify it under the terms of either of these two licenses.
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# You should have received a copy of the licenses; if not, see
# <http://www.gnu.org/licenses/> for a copy of the GNU General Public License
# and <http://www.apache.org/licenses/LICENSE-2.0> for a copy of the Apache
# License, Version 2.0.
#

"""Simple command-line interface to Dulwich>.

This is a very simple command-line wrapper for Dulwich. It is by
no means intended to be a full-blown Git command-line interface but just
a way to test Dulwich.
"""

import argparse
import os
import signal
import sys
from pathlib import Path
from typing import ClassVar, Optional

from dulwich import porcelain

from .client import GitProtocolError, get_transport_and_path
from .errors import ApplyDeltaError
from .index import Index
from .objects import valid_hexsha
from .objectspec import parse_commit
from .pack import Pack, sha_to_hex
from .repo import Repo


def signal_int(signal, frame) -> None:
    sys.exit(1)


def signal_quit(signal, frame) -> None:
    import pdb

    pdb.set_trace()


def parse_relative_time(time_str):
    """Parse a relative time string like '2 weeks ago' into seconds.

    Args:
        time_str: String like '2 weeks ago' or 'now'

    Returns:
        Number of seconds

    Raises:
        ValueError: If the time string cannot be parsed
    """
    if time_str == "now":
        return 0

    if not time_str.endswith(" ago"):
        raise ValueError(f"Invalid relative time format: {time_str}")

    parts = time_str[:-4].split()
    if len(parts) != 2:
        raise ValueError(f"Invalid relative time format: {time_str}")

    try:
        num = int(parts[0])
        unit = parts[1]

        multipliers = {
            "second": 1,
            "seconds": 1,
            "minute": 60,
            "minutes": 60,
            "hour": 3600,
            "hours": 3600,
            "day": 86400,
            "days": 86400,
            "week": 604800,
            "weeks": 604800,
        }

        if unit in multipliers:
            return num * multipliers[unit]
        else:
            raise ValueError(f"Unknown time unit: {unit}")
    except ValueError as e:
        if "invalid literal" in str(e):
            raise ValueError(f"Invalid number in relative time: {parts[0]}")
        raise


def format_bytes(bytes):
    """Format bytes as human-readable string.

    Args:
        bytes: Number of bytes

    Returns:
        Human-readable string like "1.5 MB"
    """
    for unit in ["B", "KB", "MB", "GB"]:
        if bytes < 1024.0:
            return f"{bytes:.1f} {unit}"
        bytes /= 1024.0
    return f"{bytes:.1f} TB"


class Command:
    """A Dulwich subcommand."""

    def run(self, args) -> Optional[int]:
        """Run the command."""
        raise NotImplementedError(self.run)


class cmd_archive(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "--remote",
            type=str,
            help="Retrieve archive from specified remote repo",
        )
        parser.add_argument("committish", type=str, nargs="?")
        args = parser.parse_args(args)
        if args.remote:
            client, path = get_transport_and_path(args.remote)
            client.archive(
                path,
                args.committish,
                sys.stdout.write,
                write_error=sys.stderr.write,
            )
        else:
            # Use buffer if available (for binary output), otherwise use stdout
            outstream = getattr(sys.stdout, "buffer", sys.stdout)
            porcelain.archive(
                ".", args.committish, outstream=outstream, errstream=sys.stderr
            )


class cmd_add(Command):
    def run(self, argv) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("path", nargs="+")
        args = parser.parse_args(argv)

        # Convert '.' to None to add all files
        paths = args.path
        if len(paths) == 1 and paths[0] == ".":
            paths = None

        porcelain.add(".", paths=paths)


class cmd_annotate(Command):
    def run(self, argv) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("path", help="Path to file to annotate")
        parser.add_argument("committish", nargs="?", help="Commit to start from")
        args = parser.parse_args(argv)

        results = porcelain.annotate(".", args.path, args.committish)
        for (commit, entry), line in results:
            # Show shortened commit hash and line content
            commit_hash = commit.id[:8]
            print(f"{commit_hash.decode()} {line.decode()}")


class cmd_blame(Command):
    def run(self, argv) -> None:
        # blame is an alias for annotate
        cmd_annotate().run(argv)


class cmd_rm(Command):
    def run(self, argv) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "--cached", action="store_true", help="Remove from index only"
        )
        parser.add_argument("path", type=Path, nargs="+")
        args = parser.parse_args(argv)

        porcelain.remove(".", paths=args.path, cached=args.cached)


class cmd_mv(Command):
    def run(self, argv) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "-f",
            "--force",
            action="store_true",
            help="Force move even if destination exists",
        )
        parser.add_argument("source", type=Path)
        parser.add_argument("destination", type=Path)
        args = parser.parse_args(argv)

        porcelain.mv(".", args.source, args.destination, force=args.force)


class cmd_fetch_pack(Command):
    def run(self, argv) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("--all", action="store_true")
        parser.add_argument("location", nargs="?", type=str)
        parser.add_argument("refs", nargs="*", type=str)
        args = parser.parse_args(argv)
        client, path = get_transport_and_path(args.location)
        r = Repo(".")
        if args.all:
            determine_wants = r.object_store.determine_wants_all
        else:

            def determine_wants(refs, depth: Optional[int] = None):
                return [y.encode("utf-8") for y in args.refs if y not in r.object_store]

        client.fetch(path, r, determine_wants)


class cmd_fetch(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("location", help="Remote location to fetch from")
        args = parser.parse_args(args)
        client, path = get_transport_and_path(args.location)
        r = Repo(".")

        def progress(msg: bytes) -> None:
            sys.stdout.buffer.write(msg)

        refs = client.fetch(path, r, progress=progress)
        print("Remote refs:")
        for item in refs.items():
            print("{} -> {}".format(*item))


class cmd_for_each_ref(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("pattern", type=str, nargs="?")
        args = parser.parse_args(args)
        for sha, object_type, ref in porcelain.for_each_ref(".", args.pattern):
            print(f"{sha.decode()} {object_type.decode()}\t{ref.decode()}")


class cmd_fsck(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.parse_args(args)
        for obj, msg in porcelain.fsck("."):
            print(f"{obj}: {msg}")


class cmd_log(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "--reverse",
            action="store_true",
            help="Reverse order in which entries are printed",
        )
        parser.add_argument(
            "--name-status",
            action="store_true",
            help="Print name/status for each changed file",
        )
        parser.add_argument("paths", nargs="*", help="Paths to show log for")
        args = parser.parse_args(args)

        porcelain.log(
            ".",
            paths=args.paths,
            reverse=args.reverse,
            name_status=args.name_status,
            outstream=sys.stdout,
        )


class cmd_diff(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "commit", nargs="?", default="HEAD", help="Commit to show diff for"
        )
        args = parser.parse_args(args)

        r = Repo(".")
        commit_id = (
            args.commit.encode() if isinstance(args.commit, str) else args.commit
        )
        commit = parse_commit(r, commit_id)
        parent_commit = r[commit.parents[0]]
        porcelain.diff_tree(
            r, parent_commit.tree, commit.tree, outstream=sys.stdout.buffer
        )


class cmd_dump_pack(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("filename", help="Pack file to dump")
        args = parser.parse_args(args)

        basename, _ = os.path.splitext(args.filename)
        x = Pack(basename)
        print(f"Object names checksum: {x.name()}")
        print(f"Checksum: {sha_to_hex(x.get_stored_checksum())!r}")
        x.check()
        print(f"Length: {len(x)}")
        for name in x:
            try:
                print(f"\t{x[name]}")
            except KeyError as k:
                print(f"\t{name}: Unable to resolve base {k}")
            except ApplyDeltaError as e:
                print(f"\t{name}: Unable to apply delta: {e!r}")


class cmd_dump_index(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("filename", help="Index file to dump")
        args = parser.parse_args(args)

        idx = Index(args.filename)

        for o in idx:
            print(o, idx[o])


class cmd_init(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "--bare", action="store_true", help="Create a bare repository"
        )
        parser.add_argument(
            "path", nargs="?", default=os.getcwd(), help="Repository path"
        )
        args = parser.parse_args(args)

        porcelain.init(args.path, bare=args.bare)


class cmd_clone(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "--bare",
            help="Whether to create a bare repository.",
            action="store_true",
        )
        parser.add_argument("--depth", type=int, help="Depth at which to fetch")
        parser.add_argument(
            "-b",
            "--branch",
            type=str,
            help="Check out branch instead of branch pointed to by remote HEAD",
        )
        parser.add_argument(
            "--refspec",
            type=str,
            help="References to fetch",
            action="append",
        )
        parser.add_argument(
            "--filter",
            dest="filter_spec",
            type=str,
            help="git-rev-list-style object filter",
        )
        parser.add_argument(
            "--protocol",
            type=int,
            help="Git protocol version to use",
        )
        parser.add_argument(
            "--recurse-submodules",
            action="store_true",
            help="Initialize and clone submodules",
        )
        parser.add_argument("source", help="Repository to clone from")
        parser.add_argument("target", nargs="?", help="Directory to clone into")
        args = parser.parse_args(args)

        try:
            porcelain.clone(
                args.source,
                args.target,
                bare=args.bare,
                depth=args.depth,
                branch=args.branch,
                refspec=args.refspec,
                filter_spec=args.filter_spec,
                protocol_version=args.protocol,
                recurse_submodules=args.recurse_submodules,
            )
        except GitProtocolError as e:
            print(f"{e}")


class cmd_commit(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("--message", "-m", required=True, help="Commit message")
        args = parser.parse_args(args)
        porcelain.commit(".", message=args.message)


class cmd_commit_tree(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("--message", "-m", required=True, help="Commit message")
        parser.add_argument("tree", help="Tree SHA to commit")
        args = parser.parse_args(args)
        porcelain.commit_tree(".", tree=args.tree, message=args.message)


class cmd_update_server_info(Command):
    def run(self, args) -> None:
        porcelain.update_server_info(".")


class cmd_symbolic_ref(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("name", help="Symbolic reference name")
        parser.add_argument("ref", nargs="?", help="Target reference")
        parser.add_argument("--force", action="store_true", help="Force update")
        args = parser.parse_args(args)

        # If ref is provided, we're setting; otherwise we're reading
        if args.ref:
            # Set symbolic reference
            from .repo import Repo

            with Repo(".") as repo:
                repo.refs.set_symbolic_ref(args.name.encode(), args.ref.encode())
        else:
            # Read symbolic reference
            from .repo import Repo

            with Repo(".") as repo:
                try:
                    target = repo.refs.read_ref(args.name.encode())
                    if target.startswith(b"ref: "):
                        print(target[5:].decode())
                    else:
                        print(target.decode())
                except KeyError:
                    print(f"fatal: ref '{args.name}' is not a symbolic ref")


class cmd_pack_refs(Command):
    def run(self, argv) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("--all", action="store_true")
        # ignored, we never prune
        parser.add_argument("--no-prune", action="store_true")

        args = parser.parse_args(argv)

        porcelain.pack_refs(".", all=args.all)


class cmd_show(Command):
    def run(self, argv) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("objectish", type=str, nargs="*")
        args = parser.parse_args(argv)
        porcelain.show(".", args.objectish or None, outstream=sys.stdout)


class cmd_diff_tree(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("old_tree", help="Old tree SHA")
        parser.add_argument("new_tree", help="New tree SHA")
        args = parser.parse_args(args)
        porcelain.diff_tree(".", args.old_tree, args.new_tree)


class cmd_rev_list(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("commits", nargs="+", help="Commit IDs to list")
        args = parser.parse_args(args)
        porcelain.rev_list(".", args.commits)


class cmd_tag(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "-a",
            "--annotated",
            help="Create an annotated tag.",
            action="store_true",
        )
        parser.add_argument(
            "-s", "--sign", help="Sign the annotated tag.", action="store_true"
        )
        parser.add_argument("tag_name", help="Name of the tag to create")
        args = parser.parse_args(args)
        porcelain.tag_create(
            ".", args.tag_name, annotated=args.annotated, sign=args.sign
        )


class cmd_repack(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.parse_args(args)
        porcelain.repack(".")


class cmd_reset(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        mode_group = parser.add_mutually_exclusive_group()
        mode_group.add_argument(
            "--hard", action="store_true", help="Reset working tree and index"
        )
        mode_group.add_argument("--soft", action="store_true", help="Reset only HEAD")
        mode_group.add_argument(
            "--mixed", action="store_true", help="Reset HEAD and index"
        )
        parser.add_argument("treeish", nargs="?", help="Commit/tree to reset to")
        args = parser.parse_args(args)

        if args.hard:
            mode = "hard"
        elif args.soft:
            mode = "soft"
        elif args.mixed:
            mode = "mixed"
        else:
            # Default to mixed behavior
            mode = "mixed"

        # Use the porcelain.reset function for all modes
        porcelain.reset(".", mode=mode, treeish=args.treeish)


class cmd_revert(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "--no-commit",
            "-n",
            action="store_true",
            help="Apply changes but don't create a commit",
        )
        parser.add_argument("-m", "--message", help="Custom commit message")
        parser.add_argument("commits", nargs="+", help="Commits to revert")
        args = parser.parse_args(args)

        result = porcelain.revert(
            ".", commits=args.commits, no_commit=args.no_commit, message=args.message
        )

        if result and not args.no_commit:
            print(f"[{result.decode('ascii')[:7]}] Revert completed")


class cmd_daemon(Command):
    def run(self, args) -> None:
        from dulwich import log_utils

        from .protocol import TCP_GIT_PORT

        parser = argparse.ArgumentParser()
        parser.add_argument(
            "-l",
            "--listen_address",
            default="localhost",
            help="Binding IP address.",
        )
        parser.add_argument(
            "-p",
            "--port",
            type=int,
            default=TCP_GIT_PORT,
            help="Binding TCP port.",
        )
        parser.add_argument(
            "gitdir", nargs="?", default=".", help="Git directory to serve"
        )
        args = parser.parse_args(args)

        log_utils.default_logging_config()
        porcelain.daemon(args.gitdir, address=args.listen_address, port=args.port)


class cmd_web_daemon(Command):
    def run(self, args) -> None:
        from dulwich import log_utils

        parser = argparse.ArgumentParser()
        parser.add_argument(
            "-l",
            "--listen_address",
            default="",
            help="Binding IP address.",
        )
        parser.add_argument(
            "-p",
            "--port",
            type=int,
            default=8000,
            help="Binding TCP port.",
        )
        parser.add_argument(
            "gitdir", nargs="?", default=".", help="Git directory to serve"
        )
        args = parser.parse_args(args)

        log_utils.default_logging_config()
        porcelain.web_daemon(args.gitdir, address=args.listen_address, port=args.port)


class cmd_write_tree(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.parse_args(args)
        sys.stdout.write("{}\n".format(porcelain.write_tree(".").decode()))


class cmd_receive_pack(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("gitdir", nargs="?", default=".", help="Git directory")
        args = parser.parse_args(args)
        porcelain.receive_pack(args.gitdir)


class cmd_upload_pack(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("gitdir", nargs="?", default=".", help="Git directory")
        args = parser.parse_args(args)
        porcelain.upload_pack(args.gitdir)


class cmd_status(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("gitdir", nargs="?", default=".", help="Git directory")
        args = parser.parse_args(args)
        status = porcelain.status(args.gitdir)
        if any(names for (kind, names) in status.staged.items()):
            sys.stdout.write("Changes to be committed:\n\n")
            for kind, names in status.staged.items():
                for name in names:
                    sys.stdout.write(
                        f"\t{kind}: {name.decode(sys.getfilesystemencoding())}\n"
                    )
            sys.stdout.write("\n")
        if status.unstaged:
            sys.stdout.write("Changes not staged for commit:\n\n")
            for name in status.unstaged:
                sys.stdout.write(f"\t{name.decode(sys.getfilesystemencoding())}\n")
            sys.stdout.write("\n")
        if status.untracked:
            sys.stdout.write("Untracked files:\n\n")
            for name in status.untracked:
                sys.stdout.write(f"\t{name}\n")
            sys.stdout.write("\n")


class cmd_ls_remote(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "--symref", action="store_true", help="Show symbolic references"
        )
        parser.add_argument("url", help="Remote URL to list references from")
        args = parser.parse_args(args)
        result = porcelain.ls_remote(args.url)

        if args.symref:
            # Show symrefs first, like git does
            for ref, target in sorted(result.symrefs.items()):
                sys.stdout.write(f"ref: {target.decode()}\t{ref.decode()}\n")

        # Show regular refs
        for ref in sorted(result.refs):
            sys.stdout.write(f"{result.refs[ref].decode()}\t{ref.decode()}\n")


class cmd_ls_tree(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "-r",
            "--recursive",
            action="store_true",
            help="Recursively list tree contents.",
        )
        parser.add_argument(
            "--name-only", action="store_true", help="Only display name."
        )
        parser.add_argument("treeish", nargs="?", help="Tree-ish to list")
        args = parser.parse_args(args)
        porcelain.ls_tree(
            ".",
            args.treeish,
            outstream=sys.stdout,
            recursive=args.recursive,
            name_only=args.name_only,
        )


class cmd_pack_objects(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "--stdout", action="store_true", help="Write pack to stdout"
        )
        parser.add_argument("--deltify", action="store_true", help="Create deltas")
        parser.add_argument(
            "--no-reuse-deltas", action="store_true", help="Don't reuse existing deltas"
        )
        parser.add_argument("basename", nargs="?", help="Base name for pack files")
        args = parser.parse_args(args)

        if not args.stdout and not args.basename:
            parser.error("basename required when not using --stdout")

        object_ids = [line.strip() for line in sys.stdin.readlines()]
        deltify = args.deltify
        reuse_deltas = not args.no_reuse_deltas

        if args.stdout:
            packf = getattr(sys.stdout, "buffer", sys.stdout)
            idxf = None
            close = []
        else:
            packf = open(args.basename + ".pack", "wb")
            idxf = open(args.basename + ".idx", "wb")
            close = [packf, idxf]

        porcelain.pack_objects(
            ".", object_ids, packf, idxf, deltify=deltify, reuse_deltas=reuse_deltas
        )
        for f in close:
            f.close()


class cmd_unpack_objects(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("pack_file", help="Pack file to unpack")
        args = parser.parse_args(args)

        count = porcelain.unpack_objects(args.pack_file)
        print(f"Unpacked {count} objects")


class cmd_prune(Command):
    def run(self, args) -> Optional[int]:
        import datetime
        import time

        from dulwich.object_store import DEFAULT_TEMPFILE_GRACE_PERIOD

        parser = argparse.ArgumentParser(
            description="Remove temporary pack files left behind by interrupted operations"
        )
        parser.add_argument(
            "--expire",
            nargs="?",
            const="2.weeks.ago",
            help="Only prune files older than the specified date (default: 2.weeks.ago)",
        )
        parser.add_argument(
            "--dry-run",
            "-n",
            action="store_true",
            help="Only report what would be removed",
        )
        parser.add_argument(
            "--verbose",
            "-v",
            action="store_true",
            help="Report all actions",
        )
        args = parser.parse_args(args)

        # Parse expire grace period
        grace_period = DEFAULT_TEMPFILE_GRACE_PERIOD
        if args.expire:
            try:
                grace_period = parse_relative_time(args.expire)
            except ValueError:
                # Try to parse as absolute date
                try:
                    date = datetime.datetime.strptime(args.expire, "%Y-%m-%d")
                    grace_period = int(time.time() - date.timestamp())
                except ValueError:
                    print(f"Error: Invalid expire date: {args.expire}", file=sys.stderr)
                    return 1

        # Progress callback
        def progress(msg):
            if args.verbose:
                print(msg)

        try:
            porcelain.prune(
                ".",
                grace_period=grace_period,
                dry_run=args.dry_run,
                progress=progress if args.verbose else None,
            )
            return None
        except porcelain.Error as e:
            print(f"Error: {e}", file=sys.stderr)
            return 1


class cmd_pull(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("from_location", type=str)
        parser.add_argument("refspec", type=str, nargs="*")
        parser.add_argument("--filter", type=str, nargs=1)
        parser.add_argument("--protocol", type=int)
        args = parser.parse_args(args)
        porcelain.pull(
            ".",
            args.from_location or None,
            args.refspec or None,
            filter_spec=args.filter,
            protocol_version=args.protocol or None,
        )


class cmd_push(Command):
    def run(self, argv) -> Optional[int]:
        parser = argparse.ArgumentParser()
        parser.add_argument("-f", "--force", action="store_true", help="Force")
        parser.add_argument("to_location", type=str)
        parser.add_argument("refspec", type=str, nargs="*")
        args = parser.parse_args(argv)
        try:
            porcelain.push(
                ".", args.to_location, args.refspec or None, force=args.force
            )
        except porcelain.DivergedBranches:
            sys.stderr.write("Diverged branches; specify --force to override")
            return 1

        return None


class cmd_remote_add(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("name", help="Name of the remote")
        parser.add_argument("url", help="URL of the remote")
        args = parser.parse_args(args)
        porcelain.remote_add(".", args.name, args.url)


class SuperCommand(Command):
    subcommands: ClassVar[dict[str, type[Command]]] = {}
    default_command: ClassVar[Optional[type[Command]]] = None

    def run(self, args):
        if not args:
            if self.default_command:
                return self.default_command().run(args)
            else:
                print(
                    "Supported subcommands: {}".format(
                        ", ".join(self.subcommands.keys())
                    )
                )
                return False
        cmd = args[0]
        try:
            cmd_kls = self.subcommands[cmd]
        except KeyError:
            print(f"No such subcommand: {args[0]}")
            return False
        return cmd_kls().run(args[1:])


class cmd_remote(SuperCommand):
    subcommands: ClassVar[dict[str, type[Command]]] = {
        "add": cmd_remote_add,
    }


class cmd_submodule_list(Command):
    def run(self, argv) -> None:
        parser = argparse.ArgumentParser()
        parser.parse_args(argv)
        for path, sha in porcelain.submodule_list("."):
            sys.stdout.write(f" {sha} {path}\n")


class cmd_submodule_init(Command):
    def run(self, argv) -> None:
        parser = argparse.ArgumentParser()
        parser.parse_args(argv)
        porcelain.submodule_init(".")


class cmd_submodule_add(Command):
    def run(self, argv) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("url", help="URL of repository to add as submodule")
        parser.add_argument("path", nargs="?", help="Path where submodule should live")
        parser.add_argument("--name", help="Name for the submodule")
        args = parser.parse_args(argv)
        porcelain.submodule_add(".", args.url, args.path, args.name)


class cmd_submodule_update(Command):
    def run(self, argv) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "--init", action="store_true", help="Initialize submodules first"
        )
        parser.add_argument(
            "--force",
            action="store_true",
            help="Force update even if local changes exist",
        )
        parser.add_argument(
            "paths", nargs="*", help="Specific submodule paths to update"
        )
        args = parser.parse_args(argv)
        paths = args.paths if args.paths else None
        porcelain.submodule_update(".", paths=paths, init=args.init, force=args.force)


class cmd_submodule(SuperCommand):
    subcommands: ClassVar[dict[str, type[Command]]] = {
        "add": cmd_submodule_add,
        "init": cmd_submodule_init,
        "list": cmd_submodule_list,
        "update": cmd_submodule_update,
    }

    default_command = cmd_submodule_list


class cmd_check_ignore(Command):
    def run(self, args):
        parser = argparse.ArgumentParser()
        parser.add_argument("paths", nargs="+", help="Paths to check")
        args = parser.parse_args(args)
        ret = 1
        for path in porcelain.check_ignore(".", args.paths):
            print(path)
            ret = 0
        return ret


class cmd_check_mailmap(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("identities", nargs="+", help="Identities to check")
        args = parser.parse_args(args)
        for identity in args.identities:
            canonical_identity = porcelain.check_mailmap(".", identity)
            print(canonical_identity)


class cmd_branch(Command):
    def run(self, args) -> Optional[int]:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "branch",
            type=str,
            help="Name of the branch",
        )
        parser.add_argument(
            "-d",
            "--delete",
            action="store_true",
            help="Delete branch",
        )
        args = parser.parse_args(args)
        if not args.branch:
            print("Usage: dulwich branch [-d] BRANCH_NAME")
            return 1

        if args.delete:
            porcelain.branch_delete(".", name=args.branch)
        else:
            try:
                porcelain.branch_create(".", name=args.branch)
            except porcelain.Error as e:
                sys.stderr.write(f"{e}")
                return 1
        return 0


class cmd_checkout(Command):
    def run(self, args) -> Optional[int]:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "target",
            type=str,
            help="Name of the branch, tag, or commit to checkout",
        )
        parser.add_argument(
            "-f",
            "--force",
            action="store_true",
            help="Force checkout",
        )
        parser.add_argument(
            "-b",
            "--new-branch",
            type=str,
            help="Create a new branch at the target and switch to it",
        )
        args = parser.parse_args(args)
        if not args.target:
            print("Usage: dulwich checkout TARGET [--force] [-b NEW_BRANCH]")
            return 1

        try:
            porcelain.checkout(
                ".", target=args.target, force=args.force, new_branch=args.new_branch
            )
        except porcelain.CheckoutError as e:
            sys.stderr.write(f"{e}\n")
            return 1
        return 0


class cmd_stash_list(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.parse_args(args)
        for i, entry in porcelain.stash_list("."):
            print("stash@{{{}}}: {}".format(i, entry.message.rstrip("\n")))


class cmd_stash_push(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.parse_args(args)
        porcelain.stash_push(".")
        print("Saved working directory and index state")


class cmd_stash_pop(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.parse_args(args)
        porcelain.stash_pop(".")
        print("Restored working directory and index state")


class cmd_stash(SuperCommand):
    subcommands: ClassVar[dict[str, type[Command]]] = {
        "list": cmd_stash_list,
        "pop": cmd_stash_pop,
        "push": cmd_stash_push,
    }


class cmd_ls_files(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.parse_args(args)
        for name in porcelain.ls_files("."):
            print(name)


class cmd_describe(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.parse_args(args)
        print(porcelain.describe("."))


class cmd_merge(Command):
    def run(self, args) -> Optional[int]:
        parser = argparse.ArgumentParser()
        parser.add_argument("commit", type=str, help="Commit to merge")
        parser.add_argument(
            "--no-commit", action="store_true", help="Do not create a merge commit"
        )
        parser.add_argument(
            "--no-ff", action="store_true", help="Force create a merge commit"
        )
        parser.add_argument("-m", "--message", type=str, help="Merge commit message")
        args = parser.parse_args(args)

        try:
            merge_commit_id, conflicts = porcelain.merge(
                ".",
                args.commit,
                no_commit=args.no_commit,
                no_ff=args.no_ff,
                message=args.message,
            )

            if conflicts:
                print(f"Merge conflicts in {len(conflicts)} file(s):")
                for conflict_path in conflicts:
                    print(f"  {conflict_path.decode()}")
                print(
                    "\nAutomatic merge failed; fix conflicts and then commit the result."
                )
                return 1
            elif merge_commit_id is None and not args.no_commit:
                print("Already up to date.")
            elif args.no_commit:
                print("Automatic merge successful; not committing as requested.")
            else:
                print(
                    f"Merge successful. Created merge commit {merge_commit_id.decode()}"
                )
            return 0
        except porcelain.Error as e:
            print(f"Error: {e}")
            return 1


class cmd_notes_add(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("object", help="Object to annotate")
        parser.add_argument("-m", "--message", help="Note message", required=True)
        parser.add_argument(
            "--ref", default="commits", help="Notes ref (default: commits)"
        )
        args = parser.parse_args(args)

        porcelain.notes_add(".", args.object, args.message, ref=args.ref)


class cmd_notes_show(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("object", help="Object to show notes for")
        parser.add_argument(
            "--ref", default="commits", help="Notes ref (default: commits)"
        )
        args = parser.parse_args(args)

        note = porcelain.notes_show(".", args.object, ref=args.ref)
        if note:
            sys.stdout.buffer.write(note)
        else:
            print(f"No notes found for object {args.object}")


class cmd_notes_remove(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument("object", help="Object to remove notes from")
        parser.add_argument(
            "--ref", default="commits", help="Notes ref (default: commits)"
        )
        args = parser.parse_args(args)

        result = porcelain.notes_remove(".", args.object, ref=args.ref)
        if result:
            print(f"Removed notes for object {args.object}")
        else:
            print(f"No notes found for object {args.object}")


class cmd_notes_list(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "--ref", default="commits", help="Notes ref (default: commits)"
        )
        args = parser.parse_args(args)

        notes = porcelain.notes_list(".", ref=args.ref)
        for object_sha, note_content in notes:
            print(f"{object_sha.hex()}")


class cmd_notes(SuperCommand):
    subcommands: ClassVar[dict[str, type[Command]]] = {
        "add": cmd_notes_add,
        "show": cmd_notes_show,
        "remove": cmd_notes_remove,
        "list": cmd_notes_list,
    }

    default_command = cmd_notes_list


class cmd_cherry_pick(Command):
    def run(self, args) -> Optional[int]:
        parser = argparse.ArgumentParser(
            description="Apply the changes introduced by some existing commits"
        )
        parser.add_argument("commit", nargs="?", help="Commit to cherry-pick")
        parser.add_argument(
            "-n",
            "--no-commit",
            action="store_true",
            help="Apply changes without making a commit",
        )
        parser.add_argument(
            "--continue",
            dest="continue_",
            action="store_true",
            help="Continue after resolving conflicts",
        )
        parser.add_argument(
            "--abort",
            action="store_true",
            help="Abort the current cherry-pick operation",
        )
        args = parser.parse_args(args)

        # Check argument validity
        if args.continue_ or args.abort:
            if args.commit is not None:
                parser.error("Cannot specify commit with --continue or --abort")
                return 1
        else:
            if args.commit is None:
                parser.error("Commit argument is required")
                return 1

        try:
            commit_arg = args.commit

            result = porcelain.cherry_pick(
                ".",
                commit_arg,
                no_commit=args.no_commit,
                continue_=args.continue_,
                abort=args.abort,
            )

            if args.abort:
                print("Cherry-pick aborted.")
            elif args.continue_:
                if result:
                    print(f"Cherry-pick completed: {result.decode()}")
                else:
                    print("Cherry-pick completed.")
            elif result is None:
                if args.no_commit:
                    print("Cherry-pick applied successfully (no commit created).")
                else:
                    # This shouldn't happen unless there were conflicts
                    print("Cherry-pick resulted in conflicts.")
            else:
                print(f"Cherry-pick successful: {result.decode()}")

            return None
        except porcelain.Error as e:
            print(f"Error: {e}", file=sys.stderr)
            return 1


class cmd_merge_tree(Command):
    def run(self, args) -> Optional[int]:
        parser = argparse.ArgumentParser(
            description="Perform a tree-level merge without touching the working directory"
        )
        parser.add_argument(
            "base_tree",
            nargs="?",
            help="The common ancestor tree (optional, defaults to empty tree)",
        )
        parser.add_argument("our_tree", help="Our side of the merge")
        parser.add_argument("their_tree", help="Their side of the merge")
        parser.add_argument(
            "-z",
            "--name-only",
            action="store_true",
            help="Output only conflict paths, null-terminated",
        )
        args = parser.parse_args(args)

        try:
            # Determine base tree - if only two args provided, base is None
            if args.base_tree is None:
                # Only two arguments provided
                base_tree = None
                our_tree = args.our_tree
                their_tree = args.their_tree
            else:
                # Three arguments provided
                base_tree = args.base_tree
                our_tree = args.our_tree
                their_tree = args.their_tree

            merged_tree_id, conflicts = porcelain.merge_tree(
                ".", base_tree, our_tree, their_tree
            )

            if args.name_only:
                # Output only conflict paths, null-terminated
                for conflict_path in conflicts:
                    sys.stdout.buffer.write(conflict_path)
                    sys.stdout.buffer.write(b"\0")
            else:
                # Output the merged tree SHA
                print(merged_tree_id.decode("ascii"))

                # Output conflict information
                if conflicts:
                    print(f"\nConflicts in {len(conflicts)} file(s):")
                    for conflict_path in conflicts:
                        print(f"  {conflict_path.decode()}")

            return None

        except porcelain.Error as e:
            print(f"Error: {e}", file=sys.stderr)
            return 1
        except KeyError as e:
            print(f"Error: Object not found: {e}", file=sys.stderr)
            return 1


class cmd_gc(Command):
    def run(self, args) -> Optional[int]:
        import datetime
        import time

        parser = argparse.ArgumentParser()
        parser.add_argument(
            "--auto",
            action="store_true",
            help="Only run gc if needed",
        )
        parser.add_argument(
            "--aggressive",
            action="store_true",
            help="Use more aggressive settings",
        )
        parser.add_argument(
            "--no-prune",
            action="store_true",
            help="Do not prune unreachable objects",
        )
        parser.add_argument(
            "--prune",
            nargs="?",
            const="now",
            help="Prune unreachable objects older than date (default: 2 weeks ago)",
        )
        parser.add_argument(
            "--dry-run",
            "-n",
            action="store_true",
            help="Only report what would be done",
        )
        parser.add_argument(
            "--quiet",
            "-q",
            action="store_true",
            help="Only report errors",
        )
        args = parser.parse_args(args)

        # Parse prune grace period
        grace_period = None
        if args.prune:
            try:
                grace_period = parse_relative_time(args.prune)
            except ValueError:
                # Try to parse as absolute date
                try:
                    date = datetime.datetime.strptime(args.prune, "%Y-%m-%d")
                    grace_period = int(time.time() - date.timestamp())
                except ValueError:
                    print(f"Error: Invalid prune date: {args.prune}")
                    return 1
        elif not args.no_prune:
            # Default to 2 weeks
            grace_period = 1209600

        # Progress callback
        def progress(msg):
            if not args.quiet:
                print(msg)

        try:
            stats = porcelain.gc(
                ".",
                auto=args.auto,
                aggressive=args.aggressive,
                prune=not args.no_prune,
                grace_period=grace_period,
                dry_run=args.dry_run,
                progress=progress if not args.quiet else None,
            )

            # Report results
            if not args.quiet:
                if args.dry_run:
                    print("\nDry run results:")
                else:
                    print("\nGarbage collection complete:")

                if stats.pruned_objects:
                    print(f"  Pruned {len(stats.pruned_objects)} unreachable objects")
                    print(f"  Freed {format_bytes(stats.bytes_freed)}")

                if stats.packs_before != stats.packs_after:
                    print(
                        f"  Reduced pack files from {stats.packs_before} to {stats.packs_after}"
                    )

        except porcelain.Error as e:
            print(f"Error: {e}")
            return 1
        return None


class cmd_count_objects(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "-v",
            "--verbose",
            action="store_true",
            help="Display verbose information.",
        )
        args = parser.parse_args(args)

        if args.verbose:
            stats = porcelain.count_objects(".", verbose=True)
            # Display verbose output
            print(f"count: {stats.count}")
            print(f"size: {stats.size // 1024}")  # Size in KiB
            assert stats.in_pack is not None
            print(f"in-pack: {stats.in_pack}")
            assert stats.packs is not None
            print(f"packs: {stats.packs}")
            assert stats.size_pack is not None
            print(f"size-pack: {stats.size_pack // 1024}")  # Size in KiB
        else:
            # Simple output
            stats = porcelain.count_objects(".", verbose=False)
            print(f"{stats.count} objects, {stats.size // 1024} kilobytes")


class cmd_rebase(Command):
    def run(self, args) -> int:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "upstream", nargs="?", help="Upstream branch to rebase onto"
        )
        parser.add_argument("--onto", type=str, help="Rebase onto specific commit")
        parser.add_argument(
            "--branch", type=str, help="Branch to rebase (default: current)"
        )
        parser.add_argument(
            "--abort", action="store_true", help="Abort an in-progress rebase"
        )
        parser.add_argument(
            "--continue",
            dest="continue_rebase",
            action="store_true",
            help="Continue an in-progress rebase",
        )
        parser.add_argument(
            "--skip", action="store_true", help="Skip current commit and continue"
        )
        args = parser.parse_args(args)

        # Handle abort/continue/skip first
        if args.abort:
            try:
                porcelain.rebase(".", args.upstream or "HEAD", abort=True)
                print("Rebase aborted.")
            except porcelain.Error as e:
                print(f"Error: {e}")
                return 1
            return 0

        if args.continue_rebase:
            try:
                new_shas = porcelain.rebase(
                    ".", args.upstream or "HEAD", continue_rebase=True
                )
                print("Rebase complete.")
            except porcelain.Error as e:
                print(f"Error: {e}")
                return 1
            return 0

        # Normal rebase requires upstream
        if not args.upstream:
            print("Error: Missing required argument 'upstream'")
            return 1

        try:
            new_shas = porcelain.rebase(
                ".",
                args.upstream,
                onto=args.onto,
                branch=args.branch,
            )

            if new_shas:
                print(f"Successfully rebased {len(new_shas)} commits.")
            else:
                print("Already up to date.")
            return 0

        except porcelain.Error as e:
            print(f"Error: {e}")
            return 1


class cmd_filter_branch(Command):
    def run(self, args) -> Optional[int]:
        import subprocess

        parser = argparse.ArgumentParser(description="Rewrite branches")

        # Supported Git-compatible options
        parser.add_argument(
            "--subdirectory-filter",
            type=str,
            help="Only include history for subdirectory",
        )
        parser.add_argument("--env-filter", type=str, help="Environment filter command")
        parser.add_argument("--tree-filter", type=str, help="Tree filter command")
        parser.add_argument("--index-filter", type=str, help="Index filter command")
        parser.add_argument("--parent-filter", type=str, help="Parent filter command")
        parser.add_argument("--msg-filter", type=str, help="Message filter command")
        parser.add_argument("--commit-filter", type=str, help="Commit filter command")
        parser.add_argument(
            "--tag-name-filter", type=str, help="Tag name filter command"
        )
        parser.add_argument(
            "--prune-empty", action="store_true", help="Remove empty commits"
        )
        parser.add_argument(
            "--original",
            type=str,
            default="refs/original",
            help="Namespace for original refs",
        )
        parser.add_argument(
            "-f",
            "--force",
            action="store_true",
            help="Force operation even if refs/original/* exists",
        )

        # Branch/ref to rewrite (defaults to HEAD)
        parser.add_argument(
            "branch", nargs="?", default="HEAD", help="Branch or ref to rewrite"
        )

        args = parser.parse_args(args)

        # Track if any filter fails
        filter_error = False

        # Setup environment for filters
        env = os.environ.copy()

        # Helper function to run shell commands
        def run_filter(cmd, input_data=None, cwd=None, extra_env=None):
            nonlocal filter_error
            filter_env = env.copy()
            if extra_env:
                filter_env.update(extra_env)
            result = subprocess.run(
                cmd,
                shell=True,
                input=input_data,
                cwd=cwd,
                env=filter_env,
                capture_output=True,
            )
            if result.returncode != 0:
                filter_error = True
                return None
            return result.stdout

        # Create filter functions based on arguments
        filter_message = None
        if args.msg_filter:

            def filter_message(message):
                result = run_filter(args.msg_filter, input_data=message)
                return result if result is not None else message

        tree_filter = None
        if args.tree_filter:

            def tree_filter(tree_sha, tmpdir):
                from dulwich.objects import Blob, Tree

                # Export tree to tmpdir
                with Repo(".") as r:
                    tree = r.object_store[tree_sha]
                    for entry in tree.items():
                        path = Path(tmpdir) / entry.path.decode()
                        if entry.mode & 0o040000:  # Directory
                            path.mkdir(exist_ok=True)
                        else:
                            obj = r.object_store[entry.sha]
                            path.write_bytes(obj.data)

                    # Run the filter command in the temp directory
                    run_filter(args.tree_filter, cwd=tmpdir)

                    # Rebuild tree from modified temp directory
                    def build_tree_from_dir(dir_path):
                        tree = Tree()
                        for name in sorted(os.listdir(dir_path)):
                            if name.startswith("."):
                                continue
                            path = os.path.join(dir_path, name)
                            if os.path.isdir(path):
                                subtree_sha = build_tree_from_dir(path)
                                tree.add(name.encode(), 0o040000, subtree_sha)
                            else:
                                with open(path, "rb") as f:
                                    data = f.read()
                                blob = Blob.from_string(data)
                                r.object_store.add_object(blob)
                                # Use appropriate file mode
                                mode = os.stat(path).st_mode
                                if mode & 0o100:
                                    file_mode = 0o100755
                                else:
                                    file_mode = 0o100644
                                tree.add(name.encode(), file_mode, blob.id)
                        r.object_store.add_object(tree)
                        return tree.id

                    return build_tree_from_dir(tmpdir)

        index_filter = None
        if args.index_filter:

            def index_filter(tree_sha, index_path):
                run_filter(args.index_filter, extra_env={"GIT_INDEX_FILE": index_path})
                return None  # Read back from index

        parent_filter = None
        if args.parent_filter:

            def parent_filter(parents):
                parent_str = " ".join(p.hex() for p in parents)
                result = run_filter(args.parent_filter, input_data=parent_str.encode())
                if result is None:
                    return parents

                output = result.decode().strip()
                if not output:
                    return []
                new_parents = []
                for sha in output.split():
                    if valid_hexsha(sha):
                        new_parents.append(sha)
                return new_parents

        commit_filter = None
        if args.commit_filter:

            def commit_filter(commit_obj, tree_sha):
                # The filter receives: tree parent1 parent2...
                cmd_input = tree_sha.hex()
                for parent in commit_obj.parents:
                    cmd_input += " " + parent.hex()

                result = run_filter(
                    args.commit_filter,
                    input_data=cmd_input.encode(),
                    extra_env={"GIT_COMMIT": commit_obj.id.hex()},
                )
                if result is None:
                    return None

                output = result.decode().strip()
                if not output:
                    return None  # Skip commit

                if valid_hexsha(output):
                    return output
                return None

        tag_name_filter = None
        if args.tag_name_filter:

            def tag_name_filter(tag_name):
                result = run_filter(args.tag_name_filter, input_data=tag_name)
                return result.strip() if result is not None else tag_name

        # Open repo once
        with Repo(".") as r:
            # Check for refs/original if not forcing
            if not args.force:
                original_prefix = args.original.encode() + b"/"
                for ref in r.refs.allkeys():
                    if ref.startswith(original_prefix):
                        print("Cannot create a new backup.")
                        print(f"A previous backup already exists in {args.original}/")
                        print("Force overwriting the backup with -f")
                        return 1

            try:
                # Call porcelain.filter_branch with the repo object
                result = porcelain.filter_branch(
                    r,
                    args.branch,
                    filter_message=filter_message,
                    tree_filter=tree_filter if args.tree_filter else None,
                    index_filter=index_filter if args.index_filter else None,
                    parent_filter=parent_filter if args.parent_filter else None,
                    commit_filter=commit_filter if args.commit_filter else None,
                    subdirectory_filter=args.subdirectory_filter,
                    prune_empty=args.prune_empty,
                    tag_name_filter=tag_name_filter if args.tag_name_filter else None,
                    force=args.force,
                    keep_original=True,  # Always keep original with git
                )

                # Check if any filter failed
                if filter_error:
                    print("Error: Filter command failed", file=sys.stderr)
                    return 1

                # Git filter-branch shows progress
                if result:
                    print(f"Rewrite {args.branch} ({len(result)} commits)")
                    # Git shows: Ref 'refs/heads/branch' was rewritten
                    if args.branch != "HEAD":
                        ref_name = (
                            args.branch
                            if args.branch.startswith("refs/")
                            else f"refs/heads/{args.branch}"
                        )
                        print(f"Ref '{ref_name}' was rewritten")

                return 0

            except porcelain.Error as e:
                print(f"Error: {e}", file=sys.stderr)
                return 1


class cmd_help(Command):
    def run(self, args) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "-a",
            "--all",
            action="store_true",
            help="List all commands.",
        )
        args = parser.parse_args(args)

        if args.all:
            print("Available commands:")
            for cmd in sorted(commands):
                print(f"  {cmd}")
        else:
            print(
                """\
The dulwich command line tool is currently a very basic frontend for the
Dulwich python module. For full functionality, please see the API reference.

For a list of supported commands, see 'dulwich help -a'.
"""
            )


commands = {
    "add": cmd_add,
    "annotate": cmd_annotate,
    "archive": cmd_archive,
    "blame": cmd_blame,
    "branch": cmd_branch,
    "check-ignore": cmd_check_ignore,
    "check-mailmap": cmd_check_mailmap,
    "checkout": cmd_checkout,
    "cherry-pick": cmd_cherry_pick,
    "clone": cmd_clone,
    "commit": cmd_commit,
    "commit-tree": cmd_commit_tree,
    "count-objects": cmd_count_objects,
    "describe": cmd_describe,
    "daemon": cmd_daemon,
    "diff": cmd_diff,
    "diff-tree": cmd_diff_tree,
    "dump-pack": cmd_dump_pack,
    "dump-index": cmd_dump_index,
    "fetch-pack": cmd_fetch_pack,
    "fetch": cmd_fetch,
    "filter-branch": cmd_filter_branch,
    "for-each-ref": cmd_for_each_ref,
    "fsck": cmd_fsck,
    "gc": cmd_gc,
    "help": cmd_help,
    "init": cmd_init,
    "log": cmd_log,
    "ls-files": cmd_ls_files,
    "ls-remote": cmd_ls_remote,
    "ls-tree": cmd_ls_tree,
    "merge": cmd_merge,
    "merge-tree": cmd_merge_tree,
    "notes": cmd_notes,
    "pack-objects": cmd_pack_objects,
    "pack-refs": cmd_pack_refs,
    "prune": cmd_prune,
    "pull": cmd_pull,
    "push": cmd_push,
    "rebase": cmd_rebase,
    "receive-pack": cmd_receive_pack,
    "remote": cmd_remote,
    "repack": cmd_repack,
    "reset": cmd_reset,
    "revert": cmd_revert,
    "rev-list": cmd_rev_list,
    "rm": cmd_rm,
    "mv": cmd_mv,
    "show": cmd_show,
    "stash": cmd_stash,
    "status": cmd_status,
    "symbolic-ref": cmd_symbolic_ref,
    "submodule": cmd_submodule,
    "tag": cmd_tag,
    "unpack-objects": cmd_unpack_objects,
    "update-server-info": cmd_update_server_info,
    "upload-pack": cmd_upload_pack,
    "web-daemon": cmd_web_daemon,
    "write-tree": cmd_write_tree,
}


def main(argv=None) -> Optional[int]:
    if argv is None:
        argv = sys.argv[1:]

    if len(argv) < 1:
        print("Usage: dulwich <{}> [OPTIONS...]".format("|".join(commands.keys())))
        return 1

    cmd = argv[0]
    try:
        cmd_kls = commands[cmd]
    except KeyError:
        print(f"No such subcommand: {cmd}")
        return 1
    # TODO(jelmer): Return non-0 on errors
    return cmd_kls().run(argv[1:])


def _main() -> None:
    if "DULWICH_PDB" in os.environ and getattr(signal, "SIGQUIT", None):
        signal.signal(signal.SIGQUIT, signal_quit)  # type: ignore
    signal.signal(signal.SIGINT, signal_int)

    sys.exit(main())


if __name__ == "__main__":
    _main()