aboutsummaryrefslogtreecommitdiff
path: root/contrib/mklog.py
blob: cd5ef0bcc74b90a86aa68752fd827a49aa854fe4 (plain)
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
#!/usr/bin/env python3

# Copyright (C) 2020 Free Software Foundation, Inc.
#
# This file is part of GCC.
#
# GCC is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GCC is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GCC; see the file COPYING.  If not, write to
# the Free Software Foundation, 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301, USA.

# This script parses a .diff file generated with 'diff -up' or 'diff -cp'
# and adds a skeleton ChangeLog file to the file. It does not try to be
# too smart when parsing function names, but it produces a reasonable
# approximation.
#
# Author: Martin Liska <mliska@suse.cz>

import argparse
import datetime
import os
import re
import subprocess
import sys
from itertools import takewhile

import requests

from unidiff import PatchSet

LINE_LIMIT = 100
TAB_WIDTH = 8
CO_AUTHORED_BY_PREFIX = 'co-authored-by: '

pr_regex = re.compile(r'(\/(\/|\*)|[Cc*!])\s+(?P<pr>PR [a-z+-]+\/[0-9]+)')
prnum_regex = re.compile(r'PR (?P<comp>[a-z+-]+)/(?P<num>[0-9]+)')
dr_regex = re.compile(r'(\/(\/|\*)|[Cc*!])\s+(?P<dr>DR [0-9]+)')
dg_regex = re.compile(r'{\s+dg-(error|warning)')
pr_filename_regex = re.compile(r'(^|[\W_])[Pp][Rr](?P<pr>\d{4,})')
identifier_regex = re.compile(r'^([a-zA-Z0-9_#].*)')
comment_regex = re.compile(r'^\/\*')
struct_regex = re.compile(r'^(class|struct|union|enum)\s+'
                          r'(GTY\(.*\)\s+)?([a-zA-Z0-9_]+)')
macro_regex = re.compile(r'#\s*(define|undef)\s+([a-zA-Z0-9_]+)')
super_macro_regex = re.compile(r'^DEF[A-Z0-9_]+\s*\(([a-zA-Z0-9_]+)')
fn_regex = re.compile(r'([a-zA-Z_][^()\s]*)\s*\([^*]')
template_and_param_regex = re.compile(r'<[^<>]*>')
md_def_regex = re.compile(r'\(define.*\s+"(.*)"')
bugzilla_url = 'https://gcc.gnu.org/bugzilla/rest.cgi/bug?id=%s&' \
               'include_fields=summary,component'

function_extensions = {'.c', '.cpp', '.C', '.cc', '.h', '.inc', '.def', '.md'}

# NB: Makefile.in isn't listed as it's not always generated.
generated_files = {'aclocal.m4', 'config.h.in', 'configure'}

help_message = """\
Generate ChangeLog template for PATCH.
PATCH must be generated using diff(1)'s -up or -cp options
(or their equivalent in git).
"""

script_folder = os.path.realpath(__file__)
root = os.path.dirname(os.path.dirname(script_folder))

firstpr = ''


def find_changelog(path):
    folder = os.path.split(path)[0]
    while True:
        if os.path.exists(os.path.join(root, folder, 'ChangeLog')):
            return folder
        folder = os.path.dirname(folder)
        if folder == '':
            return folder
    raise AssertionError()


def extract_function_name(line):
    if comment_regex.match(line):
        return None
    m = struct_regex.search(line)
    if m:
        # Struct declaration
        return m.group(1) + ' ' + m.group(3)
    m = macro_regex.search(line)
    if m:
        # Macro definition
        return m.group(2)
    m = super_macro_regex.search(line)
    if m:
        # Supermacro
        return m.group(1)
    m = fn_regex.search(line)
    if m:
        # Discard template and function parameters.
        fn = m.group(1)
        fn = re.sub(template_and_param_regex, '', fn)
        return fn.rstrip()
    return None


def try_add_function(functions, line):
    fn = extract_function_name(line)
    if fn and fn not in functions:
        functions.append(fn)
    return bool(fn)


def sort_changelog_files(changed_file):
    return (changed_file.is_added_file, changed_file.is_removed_file)


def get_pr_titles(prs):
    output = []
    for idx, pr in enumerate(prs):
        pr_id = pr.split('/')[-1]
        r = requests.get(bugzilla_url % pr_id)
        bugs = r.json()['bugs']
        if len(bugs) == 1:
            prs[idx] = 'PR %s/%s' % (bugs[0]['component'], pr_id)
            out = '%s - %s\n' % (prs[idx], bugs[0]['summary'])
            if out not in output:
                output.append(out)
    if output:
        output.append('')
    return '\n'.join(output)


def append_changelog_line(out, relative_path, text):
    line = f'\t* {relative_path}:'
    if len(line.replace('\t', ' ' * TAB_WIDTH) + ' ' + text) <= LINE_LIMIT:
        out += f'{line} {text}\n'
    else:
        out += f'{line}\n'
        out += f'\t{text}\n'
    return out


def get_rel_path_if_prefixed(path, folder):
    if path.startswith(folder):
        return path[len(folder):].lstrip('/')
    else:
        return path


def generate_changelog(data, no_functions=False, fill_pr_titles=False,
                       additional_prs=None):
    changelogs = {}
    changelog_list = []
    prs = []
    out = ''
    diff = PatchSet(data)
    global firstpr

    if additional_prs:
        for apr in additional_prs:
            if not apr.startswith('PR ') and '/' in apr:
                apr = 'PR ' + apr
            if apr not in prs:
                prs.append(apr)
    for file in diff:
        # skip files that can't be parsed
        if file.path == '/dev/null':
            continue
        changelog = find_changelog(file.path)
        if changelog not in changelogs:
            changelogs[changelog] = []
            changelog_list.append(changelog)
        changelogs[changelog].append(file)

        # Extract PR entries from newly added tests
        if 'testsuite' in file.path and file.is_added_file:
            # Only search first ten lines as later lines may
            # contains commented code which a note that it
            # has not been tested due to a certain PR or DR.
            this_file_prs = []
            for line in list(file)[0][0:10]:
                m = pr_regex.search(line.value)
                if m:
                    pr = m.group('pr')
                    if pr not in prs:
                        prs.append(pr)
                        this_file_prs.append(pr.split('/')[-1])
                else:
                    m = dr_regex.search(line.value)
                    if m:
                        dr = m.group('dr')
                        if dr not in prs:
                            prs.append(dr)
                            this_file_prs.append(dr.split('/')[-1])
                    elif dg_regex.search(line.value):
                        # Found dg-warning/dg-error line
                        break
            # PR number in the file name
            fname = os.path.basename(file.path)
            m = pr_filename_regex.search(fname)
            if m:
                pr = m.group('pr')
                pr2 = 'PR ' + pr
                if pr not in this_file_prs and pr2 not in prs:
                    prs.append(pr2)

    if prs:
        firstpr = prs[0]

    if fill_pr_titles:
        out += get_pr_titles(prs)

    # print list of PR entries before ChangeLog entries
    if prs:
        if not out:
            out += '\n'
        for pr in prs:
            out += '\t%s\n' % pr
        out += '\n'

    # sort ChangeLog so that 'testsuite' is at the end
    for changelog in sorted(changelog_list, key=lambda x: 'testsuite' in x):
        files = changelogs[changelog]
        out += '%s:\n' % os.path.join(changelog, 'ChangeLog')
        out += '\n'
        # new and deleted files should be at the end
        for file in sorted(files, key=sort_changelog_files):
            assert file.path.startswith(changelog)
            in_tests = 'testsuite' in changelog or 'testsuite' in file.path
            relative_path = get_rel_path_if_prefixed(file.path, changelog)
            functions = []
            if file.is_added_file:
                msg = 'New test.' if in_tests else 'New file.'
                out = append_changelog_line(out, relative_path, msg)
            elif file.is_removed_file:
                out = append_changelog_line(out, relative_path, 'Removed.')
            elif hasattr(file, 'is_rename') and file.is_rename:
                # A file can be theoretically moved to a location that
                # belongs to a different ChangeLog.  Let user fix it.
                #
                # Since unidiff 0.7.0, path.file == path.target_file[2:],
                # it used to be path.source_file[2:]
                relative_path = get_rel_path_if_prefixed(file.source_file[2:],
                                                         changelog)
                out = append_changelog_line(out, relative_path, 'Moved to...')
                new_path = get_rel_path_if_prefixed(file.target_file[2:],
                                                    changelog)
                out += f'\t* {new_path}: ...here.\n'
            elif os.path.basename(file.path) in generated_files:
                out += '\t* %s: Regenerate.\n' % (relative_path)
                append_changelog_line(out, relative_path, 'Regenerate.')
            else:
                if not no_functions:
                    for hunk in file:
                        # Do not add function names for testsuite files
                        extension = os.path.splitext(relative_path)[1]
                        if not in_tests and extension in function_extensions:
                            last_fn = None
                            modified_visited = False
                            success = False
                            for line in hunk:
                                m = identifier_regex.match(line.value)
                                if line.is_added or line.is_removed:
                                    # special-case definition in .md files
                                    m2 = md_def_regex.match(line.value)
                                    if extension == '.md' and m2:
                                        fn = m2.group(1)
                                        if fn not in functions:
                                            functions.append(fn)
                                            last_fn = None
                                            success = True

                                    if not line.value.strip():
                                        continue
                                    modified_visited = True
                                    if m and try_add_function(functions,
                                                              m.group(1)):
                                        last_fn = None
                                        success = True
                                elif line.is_context:
                                    if last_fn and modified_visited:
                                        try_add_function(functions, last_fn)
                                        last_fn = None
                                        modified_visited = False
                                        success = True
                                    elif m:
                                        last_fn = m.group(1)
                                        modified_visited = False
                            if not success:
                                try_add_function(functions,
                                                 hunk.section_header)
                if functions:
                    out += '\t* %s (%s):\n' % (relative_path, functions[0])
                    for fn in functions[1:]:
                        out += '\t(%s):\n' % fn
                else:
                    out += '\t* %s:\n' % relative_path
        out += '\n'
    return out


def update_copyright(data):
    current_timestamp = datetime.datetime.now().strftime('%Y-%m-%d')
    username = subprocess.check_output('git config user.name', shell=True,
                                       encoding='utf8').strip()
    email = subprocess.check_output('git config user.email', shell=True,
                                    encoding='utf8').strip()

    changelogs = set()
    diff = PatchSet(data)

    for file in diff:
        changelog = os.path.join(find_changelog(file.path), 'ChangeLog')
        if changelog not in changelogs:
            changelogs.add(changelog)
            with open(changelog) as f:
                content = f.read()
            with open(changelog, 'w+') as f:
                f.write(f'{current_timestamp}  {username}  <{email}>\n\n')
                f.write('\tUpdate copyright years.\n\n')
                f.write(content)


def skip_line_in_changelog(line):
    if line.lower().startswith(CO_AUTHORED_BY_PREFIX) or line.startswith('#'):
        return False
    return True


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description=help_message)
    parser.add_argument('input', nargs='?',
                        help='Patch file (or missing, read standard input)')
    parser.add_argument('-b', '--pr-numbers', action='store',
                        type=lambda arg: arg.split(','), nargs='?',
                        help='Add the specified PRs (comma separated)')
    parser.add_argument('-s', '--no-functions', action='store_true',
                        help='Do not generate function names in ChangeLogs')
    parser.add_argument('-p', '--fill-up-bug-titles', action='store_true',
                        help='Download title of mentioned PRs')
    parser.add_argument('-d', '--directory',
                        help='Root directory where to search for ChangeLog '
                        'files')
    parser.add_argument('-c', '--changelog',
                        help='Append the ChangeLog to a git commit message '
                             'file')
    parser.add_argument('--update-copyright', action='store_true',
                        help='Update copyright in ChangeLog files')
    args = parser.parse_args()
    if args.input == '-':
        args.input = None
    if args.directory:
        root = args.directory

    data = open(args.input) if args.input else sys.stdin
    if args.update_copyright:
        update_copyright(data)
    else:
        output = generate_changelog(data, args.no_functions,
                                    args.fill_up_bug_titles, args.pr_numbers)
        if args.changelog:
            lines = open(args.changelog).read().split('\n')
            start = list(takewhile(skip_line_in_changelog, lines))
            end = lines[len(start):]
            with open(args.changelog, 'w') as f:
                if not start or not start[0]:
                    # initial commit subject line 'component: [PRnnnnn]'
                    m = prnum_regex.match(firstpr)
                    if m:
                        title = f'{m.group("comp")}: [PR{m.group("num")}]'
                        start.insert(0, title)
                if start:
                    # append empty line
                    if start[-1] != '':
                        start.append('')
                else:
                    # append 2 empty lines
                    start = 2 * ['']
                f.write('\n'.join(start))
                f.write('\n')
                f.write(output)
                f.write('\n'.join(end))
        else:
            print(output, end='')