forked from ray-project/ray
-
Notifications
You must be signed in to change notification settings - Fork 0
/
git-clang-format
executable file
·593 lines (511 loc) · 21.9 KB
/
git-clang-format
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
#!/usr/bin/env python
# This file is updated from
# https://github.com/llvm-mirror/clang/blob/master/tools/clang-format/git-clang-format.
#
#===- git-clang-format - ClangFormat Git Integration ---------*- python -*--===#
#
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#
#===------------------------------------------------------------------------===#
r"""
clang-format git integration
============================
This file provides a clang-format integration for git. Put it somewhere in your
path and ensure that it is executable. Then, "git clang-format" will invoke
clang-format on the changes in current files or a specific commit.
For further details, run:
git clang-format -h
Requires Python 2.7 or Python 3
"""
from __future__ import absolute_import, division, print_function
import argparse
import collections
import contextlib
import errno
import os
import re
import subprocess
import sys
usage = 'git clang-format [OPTIONS] [<commit>] [<commit>] [--] [<file>...]'
desc = '''
If zero or one commits are given, run clang-format on all lines that differ
between the working directory and <commit>, which defaults to HEAD. Changes are
only applied to the working directory.
If two commits are given (requires --diff), run clang-format on all lines in the
second <commit> that differ from the first <commit>.
The following git-config settings set the default of the corresponding option:
clangFormat.binary
clangFormat.commit
clangFormat.extension
clangFormat.style
'''
# Name of the temporary index file in which save the output of clang-format.
# This file is created within the .git directory.
temp_index_basename = 'clang-format-index'
Range = collections.namedtuple('Range', 'start, count')
def main():
config = load_git_config()
# In order to keep '--' yet allow options after positionals, we need to
# check for '--' ourselves. (Setting nargs='*' throws away the '--', while
# nargs=argparse.REMAINDER disallows options after positionals.)
argv = sys.argv[1:]
try:
idx = argv.index('--')
except ValueError:
dash_dash = []
else:
dash_dash = argv[idx:]
argv = argv[:idx]
default_extensions = ','.join([
# From clang/lib/Frontend/FrontendOptions.cpp, all lower case
'c', 'h', # C
'm', # ObjC
'mm', # ObjC++
'cc', 'cp', 'cpp', 'c++', 'cxx', 'hpp', # C++
'cu', # CUDA
# Other languages that clang-format supports
'proto', 'protodevel', # Protocol Buffers
'java', # Java
'js', # JavaScript
'ts', # TypeScript
])
p = argparse.ArgumentParser(
usage=usage, formatter_class=argparse.RawDescriptionHelpFormatter,
description=desc)
p.add_argument('--binary',
default=config.get('clangformat.binary', 'clang-format'),
help='path to clang-format'),
p.add_argument('--commit',
default=config.get('clangformat.commit', 'HEAD'),
help='default commit to use if none is specified'),
p.add_argument('--diff', action='store_true',
help='print a diff instead of applying the changes')
p.add_argument('--extensions',
default=config.get('clangformat.extensions',
default_extensions),
help=('comma-separated list of file extensions to format, '
'excluding the period and case-insensitive')),
p.add_argument('-f', '--force', action='store_true',
help='allow changes to unstaged files')
# This option is added by ray.
p.add_argument('--exclude', help='Exclude files matching this regex.')
p.add_argument('-p', '--patch', action='store_true',
help='select hunks interactively')
p.add_argument('-q', '--quiet', action='count', default=0,
help='print less information')
p.add_argument('--style',
default=config.get('clangformat.style', None),
help='passed to clang-format'),
p.add_argument('-v', '--verbose', action='count', default=0,
help='print extra information')
# We gather all the remaining positional arguments into 'args' since we need
# to use some heuristics to determine whether or not <commit> was present.
# However, to print pretty messages, we make use of metavar and help.
p.add_argument('args', nargs='*', metavar='<commit>',
help='revision from which to compute the diff')
p.add_argument('ignored', nargs='*', metavar='<file>...',
help='if specified, only consider differences in these files')
opts = p.parse_args(argv)
opts.verbose -= opts.quiet
del opts.quiet
commits, files = interpret_args(opts.args, dash_dash, opts.commit)
if len(commits) > 1:
if not opts.diff:
die('--diff is required when two commits are given')
else:
if len(commits) > 2:
die('at most two commits allowed; %d given' % len(commits))
changed_lines = compute_diff_and_extract_lines(commits, files)
# The following code block is added by ray to exclude some files.
removed_files = []
if opts.exclude:
for filename in changed_lines.keys():
if re.match(opts.exclude, filename):
removed_files.append(filename)
for filename in removed_files:
del changed_lines[filename]
if opts.verbose >= 1:
ignored_files = set(changed_lines)
filter_by_extension(changed_lines, opts.extensions.lower().split(','))
if opts.verbose >= 1:
ignored_files.difference_update(changed_lines)
if ignored_files:
print('Ignoring changes in the following files (wrong extension):')
for filename in ignored_files:
print(' %s' % filename)
if changed_lines:
print('Running clang-format on the following files:')
for filename in changed_lines:
print(' %s' % filename)
if not changed_lines:
print('no modified files to format')
return
# The computed diff outputs absolute paths, so we must cd before accessing
# those files.
cd_to_toplevel()
if len(commits) > 1:
old_tree = commits[1]
new_tree = run_clang_format_and_save_to_tree(changed_lines,
revision=commits[1],
binary=opts.binary,
style=opts.style)
else:
old_tree = create_tree_from_workdir(changed_lines)
new_tree = run_clang_format_and_save_to_tree(changed_lines,
binary=opts.binary,
style=opts.style)
if opts.verbose >= 1:
print('old tree: %s' % old_tree)
print('new tree: %s' % new_tree)
if old_tree == new_tree:
if opts.verbose >= 0:
print('clang-format did not modify any files')
elif opts.diff:
print_diff(old_tree, new_tree)
else:
changed_files = apply_changes(old_tree, new_tree, force=opts.force,
patch_mode=opts.patch)
if (opts.verbose >= 0 and not opts.patch) or opts.verbose >= 1:
print('changed files:')
for filename in changed_files:
print(' %s' % filename)
def load_git_config(non_string_options=None):
"""Return the git configuration as a dictionary.
All options are assumed to be strings unless in `non_string_options`, in which
is a dictionary mapping option name (in lower case) to either "--bool" or
"--int"."""
if non_string_options is None:
non_string_options = {}
out = {}
for entry in run('git', 'config', '--list', '--null').split('\0'):
if entry:
name, value = entry.split('\n', 1)
if name in non_string_options:
value = run('git', 'config', non_string_options[name], name)
out[name] = value
return out
def interpret_args(args, dash_dash, default_commit):
"""Interpret `args` as "[commits] [--] [files]" and return (commits, files).
It is assumed that "--" and everything that follows has been removed from
args and placed in `dash_dash`.
If "--" is present (i.e., `dash_dash` is non-empty), the arguments to its
left (if present) are taken as commits. Otherwise, the arguments are checked
from left to right if they are commits or files. If commits are not given,
a list with `default_commit` is used."""
if dash_dash:
if len(args) == 0:
commits = [default_commit]
else:
commits = args
for commit in commits:
object_type = get_object_type(commit)
if object_type not in ('commit', 'tag'):
if object_type is None:
die("'%s' is not a commit" % commit)
else:
die("'%s' is a %s, but a commit was expected" % (commit, object_type))
files = dash_dash[1:]
elif args:
commits = []
while args:
if not disambiguate_revision(args[0]):
break
commits.append(args.pop(0))
if not commits:
commits = [default_commit]
files = args
else:
commits = [default_commit]
files = []
return commits, files
def disambiguate_revision(value):
"""Returns True if `value` is a revision, False if it is a file, or dies."""
# If `value` is ambiguous (neither a commit nor a file), the following
# command will die with an appropriate error message.
run('git', 'rev-parse', value, verbose=False)
object_type = get_object_type(value)
if object_type is None:
return False
if object_type in ('commit', 'tag'):
return True
die('`%s` is a %s, but a commit or filename was expected' %
(value, object_type))
def get_object_type(value):
"""Returns a string description of an object's type, or None if it is not
a valid git object."""
cmd = ['git', 'cat-file', '-t', value]
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = p.communicate()
if p.returncode != 0:
return None
return convert_string(stdout.strip())
def compute_diff_and_extract_lines(commits, files):
"""Calls compute_diff() followed by extract_lines()."""
diff_process = compute_diff(commits, files)
changed_lines = extract_lines(diff_process.stdout)
diff_process.stdout.close()
diff_process.wait()
if diff_process.returncode != 0:
# Assume error was already printed to stderr.
sys.exit(2)
return changed_lines
def compute_diff(commits, files):
"""Return a subprocess object producing the diff from `commits`.
The return value's `stdin` file object will produce a patch with the
differences between the working directory and the first commit if a single
one was specified, or the difference between both specified commits, filtered
on `files` (if non-empty). Zero context lines are used in the patch."""
git_tool = 'diff-index'
if len(commits) > 1:
git_tool = 'diff-tree'
cmd = ['git', git_tool, '-p', '-U0'] + commits + ['--']
cmd.extend(files)
p = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
p.stdin.close()
return p
def extract_lines(patch_file):
"""Extract the changed lines in `patch_file`.
The return value is a dictionary mapping filename to a list of (start_line,
line_count) pairs.
The input must have been produced with ``-U0``, meaning unidiff format with
zero lines of context. The return value is a dict mapping filename to a
list of line `Range`s."""
matches = {}
for line in patch_file:
line = convert_string(line)
match = re.search(r'^\+\+\+\ [^/]+/(.*)', line)
if match:
filename = match.group(1).rstrip('\r\n')
match = re.search(r'^@@ -[0-9,]+ \+(\d+)(,(\d+))?', line)
if match:
start_line = int(match.group(1))
line_count = 1
if match.group(3):
line_count = int(match.group(3))
if line_count > 0:
matches.setdefault(filename, []).append(Range(start_line, line_count))
return matches
def filter_by_extension(dictionary, allowed_extensions):
"""Delete every key in `dictionary` that doesn't have an allowed extension.
`allowed_extensions` must be a collection of lowercase file extensions,
excluding the period."""
allowed_extensions = frozenset(allowed_extensions)
for filename in list(dictionary.keys()):
base_ext = filename.rsplit('.', 1)
if len(base_ext) == 1 and '' in allowed_extensions:
continue
if len(base_ext) == 1 or base_ext[1].lower() not in allowed_extensions:
del dictionary[filename]
def cd_to_toplevel():
"""Change to the top level of the git repository."""
toplevel = run('git', 'rev-parse', '--show-toplevel')
os.chdir(toplevel)
def create_tree_from_workdir(filenames):
"""Create a new git tree with the given files from the working directory.
Returns the object ID (SHA-1) of the created tree."""
return create_tree(filenames, '--stdin')
def run_clang_format_and_save_to_tree(changed_lines, revision=None,
binary='clang-format', style=None):
"""Run clang-format on each file and save the result to a git tree.
Returns the object ID (SHA-1) of the created tree."""
def iteritems(container):
try:
return container.iteritems() # Python 2
except AttributeError:
return container.items() # Python 3
def index_info_generator():
for filename, line_ranges in iteritems(changed_lines):
if revision:
git_metadata_cmd = ['git', 'ls-tree',
'%s:%s' % (revision, os.path.dirname(filename)),
os.path.basename(filename)]
git_metadata = subprocess.Popen(git_metadata_cmd, stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
stdout = git_metadata.communicate()[0]
mode = oct(int(stdout.split()[0], 8))
else:
mode = oct(os.stat(filename).st_mode)
# Adjust python3 octal format so that it matches what git expects
if mode.startswith('0o'):
mode = '0' + mode[2:]
blob_id = clang_format_to_blob(filename, line_ranges,
revision=revision,
binary=binary,
style=style)
yield '%s %s\t%s' % (mode, blob_id, filename)
return create_tree(index_info_generator(), '--index-info')
def create_tree(input_lines, mode):
"""Create a tree object from the given input.
If mode is '--stdin', it must be a list of filenames. If mode is
'--index-info' is must be a list of values suitable for "git update-index
--index-info", such as "<mode> <SP> <sha1> <TAB> <filename>". Any other mode
is invalid."""
assert mode in ('--stdin', '--index-info')
cmd = ['git', 'update-index', '--add', '-z', mode]
with temporary_index_file():
p = subprocess.Popen(cmd, stdin=subprocess.PIPE)
for line in input_lines:
p.stdin.write(to_bytes('%s\0' % line))
p.stdin.close()
if p.wait() != 0:
die('`%s` failed' % ' '.join(cmd))
tree_id = run('git', 'write-tree')
return tree_id
def clang_format_to_blob(filename, line_ranges, revision=None,
binary='clang-format', style=None):
"""Run clang-format on the given file and save the result to a git blob.
Runs on the file in `revision` if not None, or on the file in the working
directory if `revision` is None.
Returns the object ID (SHA-1) of the created blob."""
clang_format_cmd = [binary]
if style:
clang_format_cmd.extend(['-style='+style])
clang_format_cmd.extend([
'-lines=%s:%s' % (start_line, start_line+line_count-1)
for start_line, line_count in line_ranges])
if revision:
clang_format_cmd.extend(['-assume-filename='+filename])
git_show_cmd = ['git', 'cat-file', 'blob', '%s:%s' % (revision, filename)]
git_show = subprocess.Popen(git_show_cmd, stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
git_show.stdin.close()
clang_format_stdin = git_show.stdout
else:
clang_format_cmd.extend([filename])
git_show = None
clang_format_stdin = subprocess.PIPE
try:
clang_format = subprocess.Popen(clang_format_cmd, stdin=clang_format_stdin,
stdout=subprocess.PIPE)
if clang_format_stdin == subprocess.PIPE:
clang_format_stdin = clang_format.stdin
except OSError as e:
if e.errno == errno.ENOENT:
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 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__':
main()