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from __future__ import annotations import argparse import contextlib import functools import logging import os import re import subprocess import time import unicodedata from typing import Any from typing import Generator from typing import Iterable from typing import MutableMapping from typing import Sequence from identify.identify import tags_from_path from pre_commit import color from pre_commit import git from pre_commit import output from pre_commit.all_languages import languages from pre_commit.clientlib import load_config from pre_commit.hook import Hook from pre_commit.repository import all_hooks from pre_commit.repository import install_hook_envs from pre_commit.staged_files_only import staged_files_only from pre_commit.store import Store from pre_commit.util import cmd_output_b logger = logging.getLogger('pre_commit') def _len_cjk(msg: str) -> int: widths = {'A': 1, 'F': 2, 'H': 1, 'N': 1, 'Na': 1, 'W': 2} return sum(widths[unicodedata.east_asian_width(c)] for c in msg) def _start_msg(*, start: str, cols: int, end_len: int) -> str: dots = '.' * (cols - _len_cjk(start) - end_len - 1) return f'{start}{dots}' def _full_msg( *, start: str, cols: int, end_msg: str, end_color: str, use_color: bool, postfix: str = '', ) -> str: dots = '.' * (cols - _len_cjk(start) - len(postfix) - len(end_msg) - 1) end = color.format_color(end_msg, end_color, use_color) return f'{start}{dots}{postfix}{end}\n' def filter_by_include_exclude( names: Iterable[str], include: str, exclude: str, ) -> Generator[str, None, None]: include_re, exclude_re = re.compile(include), re.compile(exclude) return ( filename for filename in names if include_re.search(filename) if not exclude_re.search(filename) ) class Classifier: def __init__(self, filenames: Iterable[str]) -> None: self.filenames = [f for f in filenames if os.path.lexists(f)] @functools.lru_cache(maxsize=None) def _types_for_file(self, filename: str) -> set[str]: return tags_from_path(filename) def by_types( self, names: Iterable[str], types: Iterable[str], types_or: Iterable[str], exclude_types: Iterable[str], ) -> Generator[str, None, None]: types = frozenset(types) types_or = frozenset(types_or) exclude_types = frozenset(exclude_types) for filename in names: tags = self._types_for_file(filename) if ( tags >= types and (not types_or or tags & types_or) and not tags & exclude_types ): yield filename def filenames_for_hook(self, hook: Hook) -> Generator[str, None, None]: return self.by_types( filter_by_include_exclude( self.filenames, hook.files, hook.exclude, ), hook.types, hook.types_or, hook.exclude_types, ) @classmethod def from_config( cls, filenames: Iterable[str], include: str, exclude: str, ) -> Classifier: # on windows we normalize all filenames to use forward slashes # this makes it easier to filter using the `files:` regex # this also makes improperly quoted shell-based hooks work better # see #1173 if os.altsep == '/' and os.sep == '\\': filenames = (f.replace(os.sep, os.altsep) for f in filenames) filenames = filter_by_include_exclude(filenames, include, exclude) return Classifier(filenames) def _get_skips(environ: MutableMapping[str, str]) -> set[str]: skips = environ.get('SKIP', '') return {skip.strip() for skip in skips.split(',') if skip.strip()} SKIPPED = 'Skipped' NO_FILES = '(no files to check)' def _subtle_line(s: str, use_color: bool) -> None: output.write_line(color.format_color(s, color.SUBTLE, use_color)) def _run_single_hook( classifier: Classifier, hook: Hook, skips: set[str], cols: int, diff_before: bytes, verbose: bool, use_color: bool, ) -> tuple[bool, bytes]: filenames = tuple(classifier.filenames_for_hook(hook)) if hook.id in skips or hook.alias in skips: output.write( _full_msg( start=hook.name, end_msg=SKIPPED, end_color=color.YELLOW, use_color=use_color, cols=cols, ), ) duration = None retcode = 0 diff_after = diff_before files_modified = False out = b'' elif not filenames and not hook.always_run: output.write( _full_msg( start=hook.name, postfix=NO_FILES, end_msg=SKIPPED, end_color=color.TURQUOISE, use_color=use_color, cols=cols, ), ) duration = None retcode = 0 diff_after = diff_before files_modified = False out = b'' else: # print hook and dots first in case the hook takes a while to run output.write(_start_msg(start=hook.name, end_len=6, cols=cols)) if not hook.pass_filenames: filenames = () time_before = time.monotonic() language = languages[hook.language] with language.in_env(hook.prefix, hook.language_version): retcode, out = language.run_hook( hook.prefix, hook.entry, hook.args, filenames, is_local=hook.src == 'local', require_serial=hook.require_serial, color=use_color, ) duration = round(time.monotonic() - time_before, 2) or 0 diff_after = _get_diff() # if the hook makes changes, fail the commit files_modified = diff_before != diff_after if retcode or files_modified: print_color = color.RED status = 'Failed' else: print_color = color.GREEN status = 'Passed' output.write_line(color.format_color(status, print_color, use_color)) if verbose or hook.verbose or retcode or files_modified: _subtle_line(f'- hook id: {hook.id}', use_color) if (verbose or hook.verbose) and duration is not None: _subtle_line(f'- duration: {duration}s', use_color) if retcode: _subtle_line(f'- exit code: {retcode}', use_color) # Print a message if failing due to file modifications if files_modified: _subtle_line('- files were modified by this hook', use_color) if out.strip(): output.write_line() output.write_line_b(out.strip(), logfile_name=hook.log_file) output.write_line() return files_modified or bool(retcode), diff_after def _compute_cols(hooks: Sequence[Hook]) -> int: """Compute the number of columns to display hook messages. The widest that will be displayed is in the no files skipped case: Hook name...(no files to check) Skipped """ if hooks: name_len = max(_len_cjk(hook.name) for hook in hooks) else: name_len = 0 cols = name_len + 3 + len(NO_FILES) + 1 + len(SKIPPED) return max(cols, 80) def _all_filenames(args: argparse.Namespace) -> Iterable[str]: # these hooks do not operate on files if args.hook_stage in { 'post-checkout', 'post-commit', 'post-merge', 'post-rewrite', 'pre-rebase', }: return () elif args.hook_stage in {'prepare-commit-msg', 'commit-msg'}: return (args.commit_msg_filename,) elif args.from_ref and args.to_ref: return git.get_changed_files(args.from_ref, args.to_ref) elif args.files: return args.files elif args.all_files: return git.get_all_files() elif git.is_in_merge_conflict(): return git.get_conflicted_files() else: return git.get_staged_files() def _get_diff() -> bytes: _, out, _ = cmd_output_b( 'git', 'diff', '--no-ext-diff', '--no-textconv', '--ignore-submodules', check=False, ) return out def _run_hooks( config: dict[str, Any], hooks: Sequence[Hook], skips: set[str], args: argparse.Namespace, ) -> int: """Actually run the hooks.""" cols = _compute_cols(hooks) classifier = Classifier.from_config( _all_filenames(args), config['files'], config['exclude'], ) retval = 0 prior_diff = _get_diff() for hook in hooks: current_retval, prior_diff = _run_single_hook( classifier, hook, skips, cols, prior_diff, verbose=args.verbose, use_color=args.color, ) retval |= current_retval if retval and (config['fail_fast'] or hook.fail_fast): break if retval and args.show_diff_on_failure and prior_diff: if args.all_files: output.write_line( 'pre-commit hook(s) made changes.\n' 'If you are seeing this message in CI, ' 'reproduce locally with: `pre-commit run --all-files`.\n' 'To run `pre-commit` as part of git workflow, use ' '`pre-commit install`.', ) output.write_line('All changes made by hooks:') # args.color is a boolean. # See user_color function in color.py git_color_opt = 'always' if args.color else 'never' subprocess.call(( 'git', '--no-pager', 'diff', '--no-ext-diff', f'--color={git_color_opt}', )) return retval def _has_unmerged_paths() -> bool: _, stdout, _ = cmd_output_b('git', 'ls-files', '--unmerged') return bool(stdout.strip()) def _has_unstaged_config(config_file: str) -> bool: retcode, _, _ = cmd_output_b( 'git', 'diff', '--quiet', '--no-ext-diff', config_file, check=False, ) # be explicit, other git errors don't mean it has an unstaged config. return retcode == 1 def run( config_file: str, store: Store, args: argparse.Namespace, environ: MutableMapping[str, str] = os.environ, ) -> int: stash = not args.all_files and not args.files # Check if we have unresolved merge conflict files and fail fast. if stash and _has_unmerged_paths(): logger.error('Unmerged files. Resolve before committing.') return 1 if bool(args.from_ref) != bool(args.to_ref): logger.error('Specify both --from-ref and --to-ref.') return 1 if stash and _has_unstaged_config(config_file): logger.error( f'Your pre-commit configuration is unstaged.\n' f'`git add {config_file}` to fix this.', ) return 1 if ( args.hook_stage in {'prepare-commit-msg', 'commit-msg'} and not args.commit_msg_filename ): logger.error( f'`--commit-msg-filename` is required for ' f'`--hook-stage {args.hook_stage}`', ) return 1 # prevent recursive post-checkout hooks (#1418) if ( args.hook_stage == 'post-checkout' and environ.get('_PRE_COMMIT_SKIP_POST_CHECKOUT') ): return 0 # Expose prepare_commit_message_source / commit_object_name # as environment variables for the hooks if args.prepare_commit_message_source: environ['PRE_COMMIT_COMMIT_MSG_SOURCE'] = ( args.prepare_commit_message_source ) if args.commit_object_name: environ['PRE_COMMIT_COMMIT_OBJECT_NAME'] = args.commit_object_name # Expose from-ref / to-ref as environment variables for hooks to consume if args.from_ref and args.to_ref: # legacy names environ['PRE_COMMIT_ORIGIN'] = args.from_ref environ['PRE_COMMIT_SOURCE'] = args.to_ref # new names environ['PRE_COMMIT_FROM_REF'] = args.from_ref environ['PRE_COMMIT_TO_REF'] = args.to_ref if args.pre_rebase_upstream and args.pre_rebase_branch: environ['PRE_COMMIT_PRE_REBASE_UPSTREAM'] = args.pre_rebase_upstream environ['PRE_COMMIT_PRE_REBASE_BRANCH'] = args.pre_rebase_branch if ( args.remote_name and args.remote_url and args.remote_branch and args.local_branch ): environ['PRE_COMMIT_LOCAL_BRANCH'] = args.local_branch environ['PRE_COMMIT_REMOTE_BRANCH'] = args.remote_branch environ['PRE_COMMIT_REMOTE_NAME'] = args.remote_name environ['PRE_COMMIT_REMOTE_URL'] = args.remote_url if args.checkout_type: environ['PRE_COMMIT_CHECKOUT_TYPE'] = args.checkout_type if args.is_squash_merge: environ['PRE_COMMIT_IS_SQUASH_MERGE'] = args.is_squash_merge if args.rewrite_command: environ['PRE_COMMIT_REWRITE_COMMAND'] = args.rewrite_command # Set pre_commit flag environ['PRE_COMMIT'] = '1' with contextlib.ExitStack() as exit_stack: if stash: exit_stack.enter_context(staged_files_only(store.directory)) config = load_config(config_file) hooks = [ hook for hook in all_hooks(config, store) if not args.hook or hook.id == args.hook or hook.alias == args.hook if args.hook_stage in hook.stages ] if args.hook and not hooks: output.write_line( f'No hook with id `{args.hook}` in stage `{args.hook_stage}`', ) return 1 skips = _get_skips(environ) to_install = [ hook for hook in hooks if hook.id not in skips and hook.alias not in skips ] install_hook_envs(to_install, store) return _run_hooks(config, hooks, skips, args) # https://github.com/python/mypy/issues/7726 raise AssertionError('unreachable')
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