642 lines
23 KiB
Python
Executable File
642 lines
23 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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#===- git-clang-format - ClangFormat Git Integration ---------*- python -*--===#
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#
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# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#
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#===------------------------------------------------------------------------===#
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r"""
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clang-format git integration
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============================
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This file provides a clang-format integration for git. Put it somewhere in your
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path and ensure that it is executable. Then, "git clang-format" will invoke
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clang-format on the changes in current files or a specific commit.
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For further details, run:
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git clang-format -h
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Requires Python 2.7 or Python 3
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"""
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from __future__ import absolute_import, division, print_function
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import argparse
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import collections
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import contextlib
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import errno
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import os
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import re
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import subprocess
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import sys
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usage = ('git clang-format [OPTIONS] [<commit>] [<commit>|--staged] '
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'[--] [<file>...]')
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desc = '''
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If zero or one commits are given, run clang-format on all lines that differ
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between the working directory and <commit>, which defaults to HEAD. Changes are
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only applied to the working directory, or in the stage/index.
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Examples:
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To format staged changes, i.e everything that's been `git add`ed:
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git clang-format
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To also format everything touched in the most recent commit:
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git clang-format HEAD~1
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If you're on a branch off main, to format everything touched on your branch:
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git clang-format main
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If two commits are given (requires --diff), run clang-format on all lines in the
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second <commit> that differ from the first <commit>.
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The following git-config settings set the default of the corresponding option:
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clangFormat.binary
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clangFormat.commit
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clangFormat.extensions
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clangFormat.style
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'''
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# Name of the temporary index file in which save the output of clang-format.
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# This file is created within the .git directory.
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temp_index_basename = 'clang-format-index'
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Range = collections.namedtuple('Range', 'start, count')
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def main():
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config = load_git_config()
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# In order to keep '--' yet allow options after positionals, we need to
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# check for '--' ourselves. (Setting nargs='*' throws away the '--', while
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# nargs=argparse.REMAINDER disallows options after positionals.)
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argv = sys.argv[1:]
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try:
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idx = argv.index('--')
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except ValueError:
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dash_dash = []
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else:
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dash_dash = argv[idx:]
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argv = argv[:idx]
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default_extensions = ','.join([
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# From clang/lib/Frontend/FrontendOptions.cpp, all lower case
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'c', 'h', # C
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'm', # ObjC
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'mm', # ObjC++
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'cc', 'cp', 'cpp', 'c++', 'cxx', 'hh', 'hpp', 'hxx', # C++
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'ccm', 'cppm', 'cxxm', 'c++m', # C++ Modules
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'cu', 'cuh', # CUDA
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# Other languages that clang-format supports
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'proto', 'protodevel', # Protocol Buffers
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'java', # Java
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'js', # JavaScript
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'ts', # TypeScript
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'cs', # C Sharp
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'json', # Json
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])
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p = argparse.ArgumentParser(
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usage=usage, formatter_class=argparse.RawDescriptionHelpFormatter,
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description=desc)
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p.add_argument('--binary',
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default=config.get('clangformat.binary', 'clang-format'),
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help='path to clang-format'),
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p.add_argument('--commit',
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default=config.get('clangformat.commit', 'HEAD'),
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help='default commit to use if none is specified'),
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p.add_argument('--diff', action='store_true',
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help='print a diff instead of applying the changes')
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p.add_argument('--diffstat', action='store_true',
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help='print a diffstat instead of applying the changes')
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p.add_argument('--extensions',
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default=config.get('clangformat.extensions',
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default_extensions),
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help=('comma-separated list of file extensions to format, '
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'excluding the period and case-insensitive')),
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p.add_argument('-f', '--force', action='store_true',
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help='allow changes to unstaged files')
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p.add_argument('-p', '--patch', action='store_true',
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help='select hunks interactively')
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p.add_argument('-q', '--quiet', action='count', default=0,
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help='print less information')
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p.add_argument('--staged', '--cached', action='store_true',
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help='format lines in the stage instead of the working dir')
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p.add_argument('--style',
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default=config.get('clangformat.style', None),
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help='passed to clang-format'),
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p.add_argument('-v', '--verbose', action='count', default=0,
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help='print extra information')
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# We gather all the remaining positional arguments into 'args' since we need
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# to use some heuristics to determine whether or not <commit> was present.
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# However, to print pretty messages, we make use of metavar and help.
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p.add_argument('args', nargs='*', metavar='<commit>',
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help='revision from which to compute the diff')
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p.add_argument('ignored', nargs='*', metavar='<file>...',
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help='if specified, only consider differences in these files')
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opts = p.parse_args(argv)
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opts.verbose -= opts.quiet
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del opts.quiet
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commits, files = interpret_args(opts.args, dash_dash, opts.commit)
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if len(commits) > 1:
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if opts.staged:
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die('--staged is not allowed when two commits are given')
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if not opts.diff:
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die('--diff is required when two commits are given')
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else:
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if len(commits) > 2:
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die('at most two commits allowed; %d given' % len(commits))
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changed_lines = compute_diff_and_extract_lines(commits, files, opts.staged)
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if opts.verbose >= 1:
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ignored_files = set(changed_lines)
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filter_by_extension(changed_lines, opts.extensions.lower().split(','))
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# The computed diff outputs absolute paths, so we must cd before accessing
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# those files.
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cd_to_toplevel()
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filter_symlinks(changed_lines)
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if opts.verbose >= 1:
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ignored_files.difference_update(changed_lines)
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if ignored_files:
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print(
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'Ignoring changes in the following files (wrong extension or symlink):')
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for filename in ignored_files:
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print(' %s' % filename)
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if changed_lines:
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print('Running clang-format on the following files:')
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for filename in changed_lines:
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print(' %s' % filename)
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if not changed_lines:
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if opts.verbose >= 0:
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print('no modified files to format')
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return 0
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if len(commits) > 1:
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old_tree = commits[1]
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new_tree = run_clang_format_and_save_to_tree(changed_lines,
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revision=commits[1],
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binary=opts.binary,
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style=opts.style)
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else:
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old_tree = create_tree_from_workdir(changed_lines)
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new_tree = run_clang_format_and_save_to_tree(changed_lines,
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binary=opts.binary,
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style=opts.style)
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if opts.verbose >= 1:
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print('old tree: %s' % old_tree)
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print('new tree: %s' % new_tree)
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if old_tree == new_tree:
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if opts.verbose >= 0:
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print('clang-format did not modify any files')
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return 0
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if opts.diff:
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print_diff(old_tree, new_tree)
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elif opts.diffstat:
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print_diffstat(old_tree, new_tree)
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else:
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changed_files = apply_changes(old_tree, new_tree, force=opts.force,
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patch_mode=opts.patch)
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if (opts.verbose >= 0 and not opts.patch) or opts.verbose >= 1:
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print('changed files:')
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for filename in changed_files:
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print(' %s' % filename)
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return 1
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def load_git_config(non_string_options=None):
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"""Return the git configuration as a dictionary.
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All options are assumed to be strings unless in `non_string_options`, in which
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is a dictionary mapping option name (in lower case) to either "--bool" or
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"--int"."""
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if non_string_options is None:
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non_string_options = {}
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out = {}
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for entry in run('git', 'config', '--list', '--null').split('\0'):
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if entry:
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if '\n' in entry:
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name, value = entry.split('\n', 1)
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else:
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# A setting with no '=' ('\n' with --null) is implicitly 'true'
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name = entry
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value = 'true'
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if name in non_string_options:
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value = run('git', 'config', non_string_options[name], name)
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out[name] = value
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return out
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def interpret_args(args, dash_dash, default_commit):
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"""Interpret `args` as "[commits] [--] [files]" and return (commits, files).
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It is assumed that "--" and everything that follows has been removed from
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args and placed in `dash_dash`.
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If "--" is present (i.e., `dash_dash` is non-empty), the arguments to its
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left (if present) are taken as commits. Otherwise, the arguments are checked
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from left to right if they are commits or files. If commits are not given,
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a list with `default_commit` is used."""
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if dash_dash:
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if len(args) == 0:
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commits = [default_commit]
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else:
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commits = args
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for commit in commits:
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object_type = get_object_type(commit)
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if object_type not in ('commit', 'tag'):
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if object_type is None:
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die("'%s' is not a commit" % commit)
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else:
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die("'%s' is a %s, but a commit was expected" % (commit, object_type))
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files = dash_dash[1:]
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elif args:
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commits = []
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while args:
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if not disambiguate_revision(args[0]):
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break
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commits.append(args.pop(0))
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if not commits:
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commits = [default_commit]
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files = args
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else:
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commits = [default_commit]
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files = []
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return commits, files
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def disambiguate_revision(value):
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"""Returns True if `value` is a revision, False if it is a file, or dies."""
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# If `value` is ambiguous (neither a commit nor a file), the following
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# command will die with an appropriate error message.
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run('git', 'rev-parse', value, verbose=False)
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object_type = get_object_type(value)
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if object_type is None:
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return False
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if object_type in ('commit', 'tag'):
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return True
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die('`%s` is a %s, but a commit or filename was expected' %
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(value, object_type))
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def get_object_type(value):
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"""Returns a string description of an object's type, or None if it is not
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a valid git object."""
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cmd = ['git', 'cat-file', '-t', value]
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p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdout, stderr = p.communicate()
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if p.returncode != 0:
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return None
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return convert_string(stdout.strip())
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def compute_diff_and_extract_lines(commits, files, staged):
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"""Calls compute_diff() followed by extract_lines()."""
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diff_process = compute_diff(commits, files, staged)
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changed_lines = extract_lines(diff_process.stdout)
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diff_process.stdout.close()
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diff_process.wait()
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if diff_process.returncode != 0:
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# Assume error was already printed to stderr.
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sys.exit(2)
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return changed_lines
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def compute_diff(commits, files, staged):
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"""Return a subprocess object producing the diff from `commits`.
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The return value's `stdin` file object will produce a patch with the
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differences between the working directory (or stage if --staged is used) and
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the first commit if a single one was specified, or the difference between
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both specified commits, filtered on `files` (if non-empty).
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Zero context lines are used in the patch."""
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git_tool = 'diff-index'
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extra_args = []
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if len(commits) > 1:
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git_tool = 'diff-tree'
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elif staged:
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extra_args += ['--cached']
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cmd = ['git', git_tool, '-p', '-U0'] + extra_args + commits + ['--']
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cmd.extend(files)
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p = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
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p.stdin.close()
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return p
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def extract_lines(patch_file):
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"""Extract the changed lines in `patch_file`.
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The return value is a dictionary mapping filename to a list of (start_line,
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line_count) pairs.
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The input must have been produced with ``-U0``, meaning unidiff format with
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zero lines of context. The return value is a dict mapping filename to a
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list of line `Range`s."""
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matches = {}
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for line in patch_file:
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line = convert_string(line)
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match = re.search(r'^\+\+\+\ [^/]+/(.*)', line)
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if match:
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filename = match.group(1).rstrip('\r\n')
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match = re.search(r'^@@ -[0-9,]+ \+(\d+)(,(\d+))?', line)
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if match:
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start_line = int(match.group(1))
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line_count = 1
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if match.group(3):
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line_count = int(match.group(3))
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if line_count == 0:
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line_count = 1
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if start_line == 0:
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continue
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matches.setdefault(filename, []).append(Range(start_line, line_count))
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return matches
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def filter_by_extension(dictionary, allowed_extensions):
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"""Delete every key in `dictionary` that doesn't have an allowed extension.
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`allowed_extensions` must be a collection of lowercase file extensions,
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excluding the period."""
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allowed_extensions = frozenset(allowed_extensions)
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for filename in list(dictionary.keys()):
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base_ext = filename.rsplit('.', 1)
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if len(base_ext) == 1 and '' in allowed_extensions:
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continue
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if len(base_ext) == 1 or base_ext[1].lower() not in allowed_extensions:
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del dictionary[filename]
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def filter_symlinks(dictionary):
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"""Delete every key in `dictionary` that is a symlink."""
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for filename in list(dictionary.keys()):
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if os.path.islink(filename):
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del dictionary[filename]
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def cd_to_toplevel():
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"""Change to the top level of the git repository."""
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toplevel = run('git', 'rev-parse', '--show-toplevel')
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os.chdir(toplevel)
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def create_tree_from_workdir(filenames):
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"""Create a new git tree with the given files from the working directory.
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Returns the object ID (SHA-1) of the created tree."""
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return create_tree(filenames, '--stdin')
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def run_clang_format_and_save_to_tree(changed_lines, revision=None,
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binary='clang-format', style=None):
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"""Run clang-format on each file and save the result to a git tree.
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Returns the object ID (SHA-1) of the created tree."""
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def iteritems(container):
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try:
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return container.iteritems() # Python 2
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except AttributeError:
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return container.items() # Python 3
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def index_info_generator():
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for filename, line_ranges in iteritems(changed_lines):
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if revision:
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git_metadata_cmd = ['git', 'ls-tree',
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'%s:%s' % (revision, os.path.dirname(filename)),
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os.path.basename(filename)]
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git_metadata = subprocess.Popen(git_metadata_cmd, stdin=subprocess.PIPE,
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stdout=subprocess.PIPE)
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stdout = git_metadata.communicate()[0]
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mode = oct(int(stdout.split()[0], 8))
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else:
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mode = oct(os.stat(filename).st_mode)
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# Adjust python3 octal format so that it matches what git expects
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if mode.startswith('0o'):
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mode = '0' + mode[2:]
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blob_id = clang_format_to_blob(filename, line_ranges,
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revision=revision,
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binary=binary,
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style=style)
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yield '%s %s\t%s' % (mode, blob_id, filename)
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return create_tree(index_info_generator(), '--index-info')
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def create_tree(input_lines, mode):
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"""Create a tree object from the given input.
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If mode is '--stdin', it must be a list of filenames. If mode is
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'--index-info' is must be a list of values suitable for "git update-index
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--index-info", such as "<mode> <SP> <sha1> <TAB> <filename>". Any other mode
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is invalid."""
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assert mode in ('--stdin', '--index-info')
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cmd = ['git', 'update-index', '--add', '-z', mode]
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with temporary_index_file():
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p = subprocess.Popen(cmd, stdin=subprocess.PIPE)
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for line in input_lines:
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p.stdin.write(to_bytes('%s\0' % line))
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p.stdin.close()
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if p.wait() != 0:
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die('`%s` failed' % ' '.join(cmd))
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tree_id = run('git', 'write-tree')
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return tree_id
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def clang_format_to_blob(filename, line_ranges, revision=None,
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binary='clang-format', style=None):
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"""Run clang-format on the given file and save the result to a git blob.
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Runs on the file in `revision` if not None, or on the file in the working
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directory if `revision` is None.
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Returns the object ID (SHA-1) of the created blob."""
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clang_format_cmd = [binary]
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if style:
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clang_format_cmd.extend(['-style='+style])
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clang_format_cmd.extend([
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'-lines=%s:%s' % (start_line, start_line+line_count-1)
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for start_line, line_count in line_ranges])
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if revision:
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clang_format_cmd.extend(['-assume-filename='+filename])
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git_show_cmd = ['git', 'cat-file', 'blob', '%s:%s' % (revision, filename)]
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git_show = subprocess.Popen(git_show_cmd, stdin=subprocess.PIPE,
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stdout=subprocess.PIPE)
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git_show.stdin.close()
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clang_format_stdin = git_show.stdout
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else:
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clang_format_cmd.extend([filename])
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git_show = None
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clang_format_stdin = subprocess.PIPE
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try:
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clang_format = subprocess.Popen(clang_format_cmd, stdin=clang_format_stdin,
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stdout=subprocess.PIPE)
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if clang_format_stdin == subprocess.PIPE:
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clang_format_stdin = clang_format.stdin
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except OSError as e:
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if e.errno == errno.ENOENT:
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die('cannot find executable "%s"' % binary)
|
|
else:
|
|
raise
|
|
clang_format_stdin.close()
|
|
hash_object_cmd = ['git', 'hash-object', '-w', '--path='+filename, '--stdin']
|
|
hash_object = subprocess.Popen(hash_object_cmd, stdin=clang_format.stdout,
|
|
stdout=subprocess.PIPE)
|
|
clang_format.stdout.close()
|
|
stdout = hash_object.communicate()[0]
|
|
if hash_object.returncode != 0:
|
|
die('`%s` failed' % ' '.join(hash_object_cmd))
|
|
if clang_format.wait() != 0:
|
|
die('`%s` failed' % ' '.join(clang_format_cmd))
|
|
if git_show and git_show.wait() != 0:
|
|
die('`%s` failed' % ' '.join(git_show_cmd))
|
|
return convert_string(stdout).rstrip('\r\n')
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def temporary_index_file(tree=None):
|
|
"""Context manager for setting GIT_INDEX_FILE to a temporary file and deleting
|
|
the file afterward."""
|
|
index_path = create_temporary_index(tree)
|
|
old_index_path = os.environ.get('GIT_INDEX_FILE')
|
|
os.environ['GIT_INDEX_FILE'] = index_path
|
|
try:
|
|
yield
|
|
finally:
|
|
if old_index_path is None:
|
|
del os.environ['GIT_INDEX_FILE']
|
|
else:
|
|
os.environ['GIT_INDEX_FILE'] = old_index_path
|
|
os.remove(index_path)
|
|
|
|
|
|
def create_temporary_index(tree=None):
|
|
"""Create a temporary index file and return the created file's path.
|
|
|
|
If `tree` is not None, use that as the tree to read in. Otherwise, an
|
|
empty index is created."""
|
|
gitdir = run('git', 'rev-parse', '--git-dir')
|
|
path = os.path.join(gitdir, temp_index_basename)
|
|
if tree is None:
|
|
tree = '--empty'
|
|
run('git', 'read-tree', '--index-output='+path, tree)
|
|
return path
|
|
|
|
|
|
def print_diff(old_tree, new_tree):
|
|
"""Print the diff between the two trees to stdout."""
|
|
# We use the porcelain 'diff' and not plumbing 'diff-tree' because the output
|
|
# is expected to be viewed by the user, and only the former does nice things
|
|
# like color and pagination.
|
|
#
|
|
# We also only print modified files since `new_tree` only contains the files
|
|
# that were modified, so unmodified files would show as deleted without the
|
|
# filter.
|
|
subprocess.check_call(['git', 'diff', '--diff-filter=M', old_tree, new_tree,
|
|
'--'])
|
|
|
|
def print_diffstat(old_tree, new_tree):
|
|
"""Print the diffstat between the two trees to stdout."""
|
|
# We use the porcelain 'diff' and not plumbing 'diff-tree' because the output
|
|
# is expected to be viewed by the user, and only the former does nice things
|
|
# like color and pagination.
|
|
#
|
|
# We also only print modified files since `new_tree` only contains the files
|
|
# that were modified, so unmodified files would show as deleted without the
|
|
# filter.
|
|
subprocess.check_call(['git', 'diff', '--diff-filter=M', '--stat', old_tree, new_tree,
|
|
'--'])
|
|
|
|
def apply_changes(old_tree, new_tree, force=False, patch_mode=False):
|
|
"""Apply the changes in `new_tree` to the working directory.
|
|
|
|
Bails if there are local changes in those files and not `force`. If
|
|
`patch_mode`, runs `git checkout --patch` to select hunks interactively."""
|
|
changed_files = run('git', 'diff-tree', '--diff-filter=M', '-r', '-z',
|
|
'--name-only', old_tree,
|
|
new_tree).rstrip('\0').split('\0')
|
|
if not force:
|
|
unstaged_files = run('git', 'diff-files', '--name-status', *changed_files)
|
|
if unstaged_files:
|
|
print('The following files would be modified but '
|
|
'have unstaged changes:', file=sys.stderr)
|
|
print(unstaged_files, file=sys.stderr)
|
|
print('Please commit, stage, or stash them first.', file=sys.stderr)
|
|
sys.exit(2)
|
|
if patch_mode:
|
|
# In patch mode, we could just as well create an index from the new tree
|
|
# and checkout from that, but then the user will be presented with a
|
|
# message saying "Discard ... from worktree". Instead, we use the old
|
|
# tree as the index and checkout from new_tree, which gives the slightly
|
|
# better message, "Apply ... to index and worktree". This is not quite
|
|
# right, since it won't be applied to the user's index, but oh well.
|
|
with temporary_index_file(old_tree):
|
|
subprocess.check_call(['git', 'checkout', '--patch', new_tree])
|
|
index_tree = old_tree
|
|
else:
|
|
with temporary_index_file(new_tree):
|
|
run('git', 'checkout-index', '-a', '-f')
|
|
return changed_files
|
|
|
|
|
|
def run(*args, **kwargs):
|
|
stdin = kwargs.pop('stdin', '')
|
|
verbose = kwargs.pop('verbose', True)
|
|
strip = kwargs.pop('strip', True)
|
|
for name in kwargs:
|
|
raise TypeError("run() got an unexpected keyword argument '%s'" % name)
|
|
p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
|
|
stdin=subprocess.PIPE)
|
|
stdout, stderr = p.communicate(input=stdin)
|
|
|
|
stdout = convert_string(stdout)
|
|
stderr = convert_string(stderr)
|
|
|
|
if p.returncode == 0:
|
|
if stderr:
|
|
if verbose:
|
|
print('`%s` printed to stderr:' % ' '.join(args), file=sys.stderr)
|
|
print(stderr.rstrip(), file=sys.stderr)
|
|
if strip:
|
|
stdout = stdout.rstrip('\r\n')
|
|
return stdout
|
|
if verbose:
|
|
print('`%s` returned %s' % (' '.join(args), p.returncode), file=sys.stderr)
|
|
if stderr:
|
|
print(stderr.rstrip(), file=sys.stderr)
|
|
sys.exit(2)
|
|
|
|
|
|
def die(message):
|
|
print('error:', message, file=sys.stderr)
|
|
sys.exit(2)
|
|
|
|
|
|
def to_bytes(str_input):
|
|
# Encode to UTF-8 to get binary data.
|
|
if isinstance(str_input, bytes):
|
|
return str_input
|
|
return str_input.encode('utf-8')
|
|
|
|
|
|
def to_string(bytes_input):
|
|
if isinstance(bytes_input, str):
|
|
return bytes_input
|
|
return bytes_input.encode('utf-8')
|
|
|
|
|
|
def convert_string(bytes_input):
|
|
try:
|
|
return to_string(bytes_input.decode('utf-8'))
|
|
except AttributeError: # 'str' object has no attribute 'decode'.
|
|
return str(bytes_input)
|
|
except UnicodeError:
|
|
return str(bytes_input)
|
|
|
|
if __name__ == '__main__':
|
|
sys.exit(main())
|