aboutsummaryrefslogtreecommitdiff
path: root/build-aux/gitlog-to-changelog
blob: 0efedb046b59b041da06034df0946044f7776714 (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
eval '(exit $?0)' && eval 'exec perl -wS "$0" ${1+"$@"}'
  & eval 'exec perl -wS "$0" $argv:q'
    if 0;
# Convert git log output to ChangeLog format.

my $VERSION = '2012-01-06 07:14'; # UTC
# The definition above must lie within the first 8 lines in order
# for the Emacs time-stamp write hook (at end) to update it.
# If you change this file with Emacs, please let the write hook
# do its job.  Otherwise, update this string manually.

# Copyright (C) 2008-2012 Free Software Foundation, Inc.

# This program 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 of the License, or
# (at your option) any later version.

# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

# Written by Jim Meyering

use strict;
use warnings;
use Getopt::Long;
use POSIX qw(strftime);

(my $ME = $0) =~ s|.*/||;

# use File::Coda; # http://meyering.net/code/Coda/
END {
  defined fileno STDOUT or return;
  close STDOUT and return;
  warn "$ME: failed to close standard output: $!\n";
  $? ||= 1;
}

sub usage ($)
{
  my ($exit_code) = @_;
  my $STREAM = ($exit_code == 0 ? *STDOUT : *STDERR);
  if ($exit_code != 0)
    {
      print $STREAM "Try '$ME --help' for more information.\n";
    }
  else
    {
      print $STREAM <<EOF;
Usage: $ME [OPTIONS] [ARGS]

Convert git log output to ChangeLog format.  If present, any ARGS
are passed to "git log".  To avoid ARGS being parsed as options to
$ME, they may be preceded by '--'.

OPTIONS:

   --amend=FILE FILE maps from an SHA1 to perl code (i.e., s/old/new/) that
                  makes a change to SHA1's commit log text or metadata.
   --append-dot append a dot to the first line of each commit message if
                  there is no other punctuation or blank at the end.
   --since=DATE convert only the logs since DATE;
                  the default is to convert all log entries.
   --format=FMT set format string for commit subject and body;
                  see 'man git-log' for the list of format metacharacters;
                  the default is '%s%n%b%n'

   --help       display this help and exit
   --version    output version information and exit

EXAMPLE:

  $ME --since=2008-01-01 > ChangeLog
  $ME -- -n 5 foo > last-5-commits-to-branch-foo

SPECIAL SYNTAX:

The following types of strings are interpreted specially when they appear
at the beginning of a log message line.  They are not copied to the output.

  Copyright-paperwork-exempt: Yes
    Append the "(tiny change)" notation to the usual "date name email"
    ChangeLog header to mark a change that does not require a copyright
    assignment.
  Co-authored-by: Joe User <user\@example.com>
    List the specified name and email address on a second
    ChangeLog header, denoting a co-author.
  Signed-off-by: Joe User <user\@example.com>
    These lines are simply elided.

In a FILE specified via --amend, comment lines (starting with "#") are ignored.
FILE must consist of <SHA,CODE+> pairs where SHA is a 40-byte SHA1 (alone on
a line) referring to a commit in the current project, and CODE refers to one
or more consecutive lines of Perl code.  Pairs must be separated by one or
more blank line.

Here is sample input for use with --amend=FILE, from coreutils:

3a169f4c5d9159283548178668d2fae6fced3030
# fix typo in title:
s/all tile types/all file types/

1379ed974f1fa39b12e2ffab18b3f7a607082202
# Due to a bug in vc-dwim, I mis-attributed a patch by Paul to myself.
# Change the author to be Paul.  Note the escaped "@":
s,Jim .*>,Paul Eggert <eggert\\\@cs.ucla.edu>,

EOF
    }
  exit $exit_code;
}

# If the string $S is a well-behaved file name, simply return it.
# If it contains white space, quotes, etc., quote it, and return the new string.
sub shell_quote($)
{
  my ($s) = @_;
  if ($s =~ m![^\w+/.,-]!)
    {
      # Convert each single quote to '\''
      $s =~ s/\'/\'\\\'\'/g;
      # Then single quote the string.
      $s = "'$s'";
    }
  return $s;
}

sub quoted_cmd(@)
{
  return join (' ', map {shell_quote $_} @_);
}

# Parse file F.
# Comment lines (starting with "#") are ignored.
# F must consist of <SHA,CODE+> pairs where SHA is a 40-byte SHA1
# (alone on a line) referring to a commit in the current project, and
# CODE refers to one or more consecutive lines of Perl code.
# Pairs must be separated by one or more blank line.
sub parse_amend_file($)
{
  my ($f) = @_;

  open F, '<', $f
    or die "$ME: $f: failed to open for reading: $!\n";

  my $fail;
  my $h = {};
  my $in_code = 0;
  my $sha;
  while (defined (my $line = <F>))
    {
      $line =~ /^\#/
        and next;
      chomp $line;
      $line eq ''
        and $in_code = 0, next;

      if (!$in_code)
        {
          $line =~ /^([0-9a-fA-F]{40})$/
            or (warn "$ME: $f:$.: invalid line; expected an SHA1\n"),
              $fail = 1, next;
          $sha = lc $1;
          $in_code = 1;
          exists $h->{$sha}
            and (warn "$ME: $f:$.: duplicate SHA1\n"),
              $fail = 1, next;
        }
      else
        {
          $h->{$sha} ||= '';
          $h->{$sha} .= "$line\n";
        }
    }
  close F;

  $fail
    and exit 1;

  return $h;
}

{
  my $since_date;
  my $format_string = '%s%n%b%n';
  my $amend_file;
  my $append_dot = 0;
  GetOptions
    (
     help => sub { usage 0 },
     version => sub { print "$ME version $VERSION\n"; exit },
     'since=s' => \$since_date,
     'format=s' => \$format_string,
     'amend=s' => \$amend_file,
     'append-dot' => \$append_dot,
    ) or usage 1;


  defined $since_date
    and unshift @ARGV, "--since=$since_date";

  # This is a hash that maps an SHA1 to perl code (i.e., s/old/new/)
  # that makes a correction in the log or attribution of that commit.
  my $amend_code = defined $amend_file ? parse_amend_file $amend_file : {};

  my @cmd = (qw (git log --log-size),
             '--pretty=format:%H:%ct  %an  <%ae>%n%n'.$format_string, @ARGV);
  open PIPE, '-|', @cmd
    or die ("$ME: failed to run '". quoted_cmd (@cmd) ."': $!\n"
            . "(Is your Git too old?  Version 1.5.1 or later is required.)\n");

  my $prev_multi_paragraph;
  my $prev_date_line = '';
  my @prev_coauthors = ();
  while (1)
    {
      defined (my $in = <PIPE>)
        or last;
      $in =~ /^log size (\d+)$/
        or die "$ME:$.: Invalid line (expected log size):\n$in";
      my $log_nbytes = $1;

      my $log;
      my $n_read = read PIPE, $log, $log_nbytes;
      $n_read == $log_nbytes
        or die "$ME:$.: unexpected EOF\n";

      # Extract leading hash.
      my ($sha, $rest) = split ':', $log, 2;
      defined $sha
        or die "$ME:$.: malformed log entry\n";
      $sha =~ /^[0-9a-fA-F]{40}$/
        or die "$ME:$.: invalid SHA1: $sha\n";

      # If this commit's log requires any transformation, do it now.
      my $code = $amend_code->{$sha};
      if (defined $code)
        {
          eval 'use Safe';
          my $s = new Safe;
          # Put the unpreprocessed entry into "$_".
          $_ = $rest;

          # Let $code operate on it, safely.
          my $r = $s->reval("$code")
            or die "$ME:$.:$sha: failed to eval \"$code\":\n$@\n";

          # Note that we've used this entry.
          delete $amend_code->{$sha};

          # Update $rest upon success.
          $rest = $_;
        }

      my @line = split "\n", $rest;
      my $author_line = shift @line;
      defined $author_line
        or die "$ME:$.: unexpected EOF\n";
      $author_line =~ /^(\d+)  (.*>)$/
        or die "$ME:$.: Invalid line "
          . "(expected date/author/email):\n$author_line\n";

      # Format 'Copyright-paperwork-exempt: Yes' as a standard ChangeLog
      # `(tiny change)' annotation.
      my $tiny = (grep (/^Copyright-paperwork-exempt:\s+[Yy]es$/, @line)
                  ? '  (tiny change)' : '');

      my $date_line = sprintf "%s  %s$tiny\n",
        strftime ("%F", localtime ($1)), $2;

      my @coauthors = grep /^Co-authored-by:.*$/, @line;
      # Omit meta-data lines we've already interpreted.
      @line = grep !/^(?:Signed-off-by:[ ].*>$
                       |Co-authored-by:[ ]
                       |Copyright-paperwork-exempt:[ ]
                       )/x, @line;

      # Remove leading and trailing blank lines.
      if (@line)
        {
          while ($line[0] =~ /^\s*$/) { shift @line; }
          while ($line[$#line] =~ /^\s*$/) { pop @line; }
        }

      # Record whether there are two or more paragraphs.
      my $multi_paragraph = grep /^\s*$/, @line;

      # Format 'Co-authored-by: A U Thor <email@example.com>' lines in
      # standard multi-author ChangeLog format.
      for (@coauthors)
        {
          s/^Co-authored-by:\s*/\t    /;
          s/\s*</  </;

          /<.*?@.*\..*>/
            or warn "$ME: warning: missing email address for "
              . substr ($_, 5) . "\n";
        }

      # If this header would be different from the previous date/name/email/
      # coauthors header, or if this or the previous entry consists of two
      # or more paragraphs, then print the header.
      if ($date_line ne $prev_date_line
          or "@coauthors" ne "@prev_coauthors"
          or $multi_paragraph
          or $prev_multi_paragraph)
        {
          $prev_date_line eq ''
            or print "\n";
          print $date_line;
          @coauthors
            and print join ("\n", @coauthors), "\n";
        }
      $prev_date_line = $date_line;
      @prev_coauthors = @coauthors;
      $prev_multi_paragraph = $multi_paragraph;

      # If there were any lines
      if (@line == 0)
        {
          warn "$ME: warning: empty commit message:\n  $date_line\n";
        }
      else
        {
          if ($append_dot)
            {
              # If the first line of the message has enough room, then
              if (length $line[0] < 72)
                {
                  # append a dot if there is no other punctuation or blank
                  # at the end.
                  $line[0] =~ /[[:punct:]\s]$/
                    or $line[0] .= '.';
                }
            }

          # Prefix each non-empty line with a TAB.
          @line = map { length $_ ? "\t$_" : '' } @line;

          print "\n", join ("\n", @line), "\n";
        }

      defined ($in = <PIPE>)
        or last;
      $in ne "\n"
        and die "$ME:$.: unexpected line:\n$in";
    }

  close PIPE
    or die "$ME: error closing pipe from " . quoted_cmd (@cmd) . "\n";
  # FIXME-someday: include $PROCESS_STATUS in the diagnostic

  # Complain about any unused entry in the --amend=F specified file.
  my $fail = 0;
  foreach my $sha (keys %$amend_code)
    {
      warn "$ME:$amend_file: unused entry: $sha\n";
      $fail = 1;
    }

  exit $fail;
}

# Local Variables:
# mode: perl
# indent-tabs-mode: nil
# eval: (add-hook 'write-file-hooks 'time-stamp)
# time-stamp-start: "my $VERSION = '"
# time-stamp-format: "%:y-%02m-%02d %02H:%02M"
# time-stamp-time-zone: "UTC"
# time-stamp-end: "'; # UTC"
# End: