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import argparse

import os.path

import subprocess

import sys

from typing import Optional

from typing import Sequence

from typing import Tuple

from pre_commit.commands.run import run

from pre_commit.envcontext import envcontext

from pre_commit.parse_shebang import normalize_cmd

from pre_commit.store import Store

Z40 = '0' * 40

def _run_legacy(

hook_type: str,

hook_dir: str,

args: Sequence[str],

) -> Tuple[int, bytes]:

if os.environ.get('PRE_COMMIT_RUNNING_LEGACY'):

raise SystemExit(

f"bug: pre-commit's script is installed in migration mode\n"

f'run `pre-commit install -f --hook-type {hook_type}` to fix '

f'this\n\n'

f'Please report this bug at '

f'https://github.com/pre-commit/pre-commit/issues',

)

if hook_type == 'pre-push':

stdin = sys.stdin.buffer.read()

else:

stdin = b''

# not running in legacy mode

legacy_hook = os.path.join(hook_dir, f'{hook_type}.legacy')

if not os.access(legacy_hook, os.X_OK):

return 0, stdin

with envcontext((('PRE_COMMIT_RUNNING_LEGACY', '1'),)):

cmd = normalize_cmd((legacy_hook, *args))

return subprocess.run(cmd, input=stdin).returncode, stdin

def _validate_config(

retv: int,

config: str,

skip_on_missing_config: bool,

) -> None:

if not os.path.isfile(config):

if skip_on_missing_config or os.getenv('PRE_COMMIT_ALLOW_NO_CONFIG'):

print(f'`{config}` config file not found. Skipping `pre-commit`.')

raise SystemExit(retv)

else:

print(

f'No {config} file was found\n'

f'- To temporarily silence this, run '

f'`PRE_COMMIT_ALLOW_NO_CONFIG=1 git ...`\n'

f'- To permanently silence this, install pre-commit with the '

f'--allow-missing-config option\n'

f'- To uninstall pre-commit run `pre-commit uninstall`',

)

raise SystemExit(1)

def _ns(

hook_type: str,

color: bool,

all_files: bool = False,

remote_branch: Optional[str] = None,

from_ref: Optional[str] = None,

to_ref: Optional[str] = None,

remote_name: Optional[str] = None,

remote_url: Optional[str] = None,

commit_msg_filename: Optional[str] = None,

checkout_type: Optional[str] = None,

is_squash_merge: Optional[str] = None,

) -> argparse.Namespace:

return argparse.Namespace(

color=color,

hook_stage=hook_type.replace('pre-', ''),

remote_branch=remote_branch,

from_ref=from_ref,

to_ref=to_ref,

remote_name=remote_name,

remote_url=remote_url,

commit_msg_filename=commit_msg_filename,

all_files=all_files,

checkout_type=checkout_type,

is_squash_merge=is_squash_merge,

files=(),

hook=None,

verbose=False,

show_diff_on_failure=False,

)

def _rev_exists(rev: str) -> bool:

return not subprocess.call(('git', 'rev-list', '--quiet', rev))

def _pre_push_ns(

color: bool,

args: Sequence[str],

stdin: bytes,

) -> Optional[argparse.Namespace]:

remote_name = args[0]

remote_url = args[1]

for line in stdin.decode().splitlines():

_, local_sha, remote_branch, remote_sha = line.split()

if local_sha == Z40:

continue

elif remote_sha != Z40 and _rev_exists(remote_sha):

return _ns(

'pre-push', color,

from_ref=remote_sha, to_ref=local_sha,

remote_branch=remote_branch,

remote_name=remote_name, remote_url=remote_url,

)

else:

# ancestors not found in remote

ancestors = subprocess.check_output((

'git', 'rev-list', local_sha, '--topo-order', '--reverse',

'--not', f'--remotes={remote_name}',

)).decode().strip()

if not ancestors:

continue

else:

first_ancestor = ancestors.splitlines()[0]

cmd = ('git', 'rev-list', '--max-parents=0', local_sha)

roots = set(subprocess.check_output(cmd).decode().splitlines())

if first_ancestor in roots:

# pushing the whole tree including root commit

return _ns(

'pre-push', color,

all_files=True,

remote_name=remote_name, remote_url=remote_url,

remote_branch=remote_branch,

)

else:

rev_cmd = ('git', 'rev-parse', f'{first_ancestor}^')

source = subprocess.check_output(rev_cmd).decode().strip()

return _ns(

'pre-push', color,

from_ref=source, to_ref=local_sha,

remote_name=remote_name, remote_url=remote_url,

remote_branch=remote_branch,

)

# nothing to push

return None

_EXPECTED_ARG_LENGTH_BY_HOOK = {

'commit-msg': 1,

'post-checkout': 3,

'post-commit': 0,

'pre-commit': 0,

'pre-merge-commit': 0,

'post-merge': 1,

'pre-push': 2,

}

def _check_args_length(hook_type: str, args: Sequence[str]) -> None:

if hook_type == 'prepare-commit-msg':

if len(args) < 1 or len(args) > 3:

raise SystemExit(

f'hook-impl for {hook_type} expected 1, 2, or 3 arguments '

f'but got {len(args)}: {args}',

)

elif hook_type in _EXPECTED_ARG_LENGTH_BY_HOOK:

expected = _EXPECTED_ARG_LENGTH_BY_HOOK[hook_type]

if len(args) != expected:

arguments_s = 'argument' if expected == 1 else 'arguments'

raise SystemExit(

f'hook-impl for {hook_type} expected {expected} {arguments_s} '

f'but got {len(args)}: {args}',

)

else:

raise AssertionError(f'unexpected hook type: {hook_type}')

def _run_ns(

hook_type: str,

color: bool,

args: Sequence[str],

stdin: bytes,

) -> Optional[argparse.Namespace]:

_check_args_length(hook_type, args)

if hook_type == 'pre-push':

return _pre_push_ns(color, args, stdin)

elif hook_type in {'commit-msg', 'prepare-commit-msg'}:

return _ns(hook_type, color, commit_msg_filename=args[0])

elif hook_type in {'post-commit', 'pre-merge-commit', 'pre-commit'}:

return _ns(hook_type, color)

elif hook_type == 'post-checkout':

return _ns(

hook_type, color,

from_ref=args[0], to_ref=args[1], checkout_type=args[2],

)

elif hook_type == 'post-merge':

return _ns(hook_type, color, is_squash_merge=args[0])

else:

raise AssertionError(f'unexpected hook type: {hook_type}')

def hook_impl(

store: Store,

config: str,

color: bool,

hook_type: str,

hook_dir: str,

skip_on_missing_config: bool,

args: Sequence[str],

) -> int:

retv, stdin = _run_legacy(hook_type, hook_dir, args)

_validate_config(retv, config, skip_on_missing_config)

ns = _run_ns(hook_type, color, args, stdin)

if ns is None:

return retv

else:

return retv | run(config, store, ns)

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