build-aux/gitlog-to-changelog

   1 eval '(exit $?0)' && eval 'exec perl -wS "$0" ${1+"$@"}'
   2   & eval 'exec perl -wS "$0" $argv:q'
   3     if 0;
   4 # Convert git log output to ChangeLog format.
   5
   6 my $VERSION = '2012-07-29 06:11'; # UTC
   7 # The definition above must lie within the first 8 lines in order
   8 # for the Emacs time-stamp write hook (at end) to update it.
   9 # If you change this file with Emacs, please let the write hook
  10 # do its job.  Otherwise, update this string manually.
  11
  12 # Copyright (C) 2008-2014 Free Software Foundation, Inc.
  13
  14 # This program is free software: you can redistribute it and/or modify
  15 # it under the terms of the GNU General Public License as published by
  16 # the Free Software Foundation, either version 3 of the License, or
  17 # (at your option) any later version.
  18
  19 # This program is distributed in the hope that it will be useful,
  20 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 # GNU General Public License for more details.
  23
  24 # You should have received a copy of the GNU General Public License
  25 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  26
  27 # Written by Jim Meyering
  28
  29 use strict;
  30 use warnings;
  31 use Getopt::Long;
  32 use POSIX qw(strftime);
  33
  34 (my $ME = $0) =~ s|.*/||;
  35
  36 # use File::Coda; # http://meyering.net/code/Coda/
  37 END {
  38   defined fileno STDOUT or return;
  39   close STDOUT and return;
  40   warn "$ME: failed to close standard output: $!\n";
  41   $? ||= 1;
  42 }
  43
  44 sub usage ($)
  45 {
  46   my ($exit_code) = @_;
  47   my $STREAM = ($exit_code == 0 ? *STDOUT : *STDERR);
  48   if ($exit_code != 0)
  49     {
  50       print $STREAM "Try '$ME --help' for more information.\n";
  51     }
  52   else
  53     {
  54       print $STREAM <<EOF;
  55 Usage: $ME [OPTIONS] [ARGS]
  56
  57 Convert git log output to ChangeLog format.  If present, any ARGS
  58 are passed to "git log".  To avoid ARGS being parsed as options to
  59 $ME, they may be preceded by '--'.
  60
  61 OPTIONS:
  62
  63    --amend=FILE FILE maps from an SHA1 to perl code (i.e., s/old/new/) that
  64                   makes a change to SHA1's commit log text or metadata.
  65    --append-dot append a dot to the first line of each commit message if
  66                   there is no other punctuation or blank at the end.
  67    --no-cluster never cluster commit messages under the same date/author
  68                   header; the default is to cluster adjacent commit messages
  69                   if their headers are the same and neither commit message
  70                   contains multiple paragraphs.
  71    --srcdir=DIR the root of the source tree, from which the .git/
  72                   directory can be derived.
  73    --since=DATE convert only the logs since DATE;
  74                   the default is to convert all log entries.
  75    --format=FMT set format string for commit subject and body;
  76                   see 'man git-log' for the list of format metacharacters;
  77                   the default is '%s%n%b%n'
  78    --strip-tab  remove one additional leading TAB from commit message lines.
  79    --strip-cherry-pick  remove data inserted by "git cherry-pick";
  80                   this includes the "cherry picked from commit ..." line,
  81                   and the possible final "Conflicts:" paragraph.
  82    --help       display this help and exit
  83    --version    output version information and exit
  84
  85 EXAMPLE:
  86
  87   $ME --since=2008-01-01 > ChangeLog
  88   $ME -- -n 5 foo > last-5-commits-to-branch-foo
  89
  90 SPECIAL SYNTAX:
  91
  92 The following types of strings are interpreted specially when they appear
  93 at the beginning of a log message line.  They are not copied to the output.
  94
  95   Copyright-paperwork-exempt: Yes
  96     Append the "(tiny change)" notation to the usual "date name email"
  97     ChangeLog header to mark a change that does not require a copyright
  98     assignment.
  99   Co-authored-by: Joe User <user\@example.com>
 100     List the specified name and email address on a second
 101     ChangeLog header, denoting a co-author.
 102   Signed-off-by: Joe User <user\@example.com>
 103     These lines are simply elided.
 104
 105 In a FILE specified via --amend, comment lines (starting with "#") are ignored.
 106 FILE must consist of <SHA,CODE+> pairs where SHA is a 40-byte SHA1 (alone on
 107 a line) referring to a commit in the current project, and CODE refers to one
 108 or more consecutive lines of Perl code.  Pairs must be separated by one or
 109 more blank line.
 110
 111 Here is sample input for use with --amend=FILE, from coreutils:
 112
 113 3a169f4c5d9159283548178668d2fae6fced3030
 114 # fix typo in title:
 115 s/all tile types/all file types/
 116
 117 1379ed974f1fa39b12e2ffab18b3f7a607082202
 118 # Due to a bug in vc-dwim, I mis-attributed a patch by Paul to myself.
 119 # Change the author to be Paul.  Note the escaped "@":
 120 s,Jim .*>,Paul Eggert <eggert\\\@cs.ucla.edu>,
 121
 122 EOF
 123     }
 124   exit $exit_code;
 125 }
 126
 127 # If the string $S is a well-behaved file name, simply return it.
 128 # If it contains white space, quotes, etc., quote it, and return the new string.
 129 sub shell_quote($)
 130 {
 131   my ($s) = @_;
 132   if ($s =~ m![^\w+/.,-]!)
 133     {
 134       # Convert each single quote to '\''
 135       $s =~ s/\'/\'\\\'\'/g;
 136       # Then single quote the string.
 137       $s = "'$s'";
 138     }
 139   return $s;
 140 }
 141
 142 sub quoted_cmd(@)
 143 {
 144   return join (' ', map {shell_quote $_} @_);
 145 }
 146
 147 # Parse file F.
 148 # Comment lines (starting with "#") are ignored.
 149 # F must consist of <SHA,CODE+> pairs where SHA is a 40-byte SHA1
 150 # (alone on a line) referring to a commit in the current project, and
 151 # CODE refers to one or more consecutive lines of Perl code.
 152 # Pairs must be separated by one or more blank line.
 153 sub parse_amend_file($)
 154 {
 155   my ($f) = @_;
 156
 157   open F, '<', $f
 158     or die "$ME: $f: failed to open for reading: $!\n";
 159
 160   my $fail;
 161   my $h = {};
 162   my $in_code = 0;
 163   my $sha;
 164   while (defined (my $line = <F>))
 165     {
 166       $line =~ /^\#/
 167         and next;
 168       chomp $line;
 169       $line eq ''
 170         and $in_code = 0, next;
 171
 172       if (!$in_code)
 173         {
 174           $line =~ /^([0-9a-fA-F]{40})$/
 175             or (warn "$ME: $f:$.: invalid line; expected an SHA1\n"),
 176               $fail = 1, next;
 177           $sha = lc $1;
 178           $in_code = 1;
 179           exists $h->{$sha}
 180             and (warn "$ME: $f:$.: duplicate SHA1\n"),
 181               $fail = 1, next;
 182         }
 183       else
 184         {
 185           $h->{$sha} ||= '';
 186           $h->{$sha} .= "$line\n";
 187         }
 188     }
 189   close F;
 190
 191   $fail
 192     and exit 1;
 193
 194   return $h;
 195 }
 196
 197 # git_dir_option $SRCDIR
 198 #
 199 # From $SRCDIR, the --git-dir option to pass to git (none if $SRCDIR
 200 # is undef).  Return as a list (0 or 1 element).
 201 sub git_dir_option($)
 202 {
 203   my ($srcdir) = @_;
 204   my @res = ();
 205   if (defined $srcdir)
 206     {
 207       my $qdir = shell_quote $srcdir;
 208       my $cmd = "cd $qdir && git rev-parse --show-toplevel";
 209       my $qcmd = shell_quote $cmd;
 210       my $git_dir = qx($cmd);
 211       defined $git_dir
 212         or die "$ME: cannot run $qcmd: $!\n";
 213       $? == 0
 214         or die "$ME: $qcmd had unexpected exit code or signal ($?)\n";
 215       chomp $git_dir;
 216       push @res, "--git-dir=$git_dir/.git";
 217     }
 218   @res;
 219 }
 220
 221 {
 222   my $since_date;
 223   my $format_string = '%s%n%b%n';
 224   my $amend_file;
 225   my $append_dot = 0;
 226   my $cluster = 1;
 227   my $strip_tab = 0;
 228   my $strip_cherry_pick = 0;
 229   my $srcdir;
 230   GetOptions
 231     (
 232      help => sub { usage 0 },
 233      version => sub { print "$ME version $VERSION\n"; exit },
 234      'since=s' => \$since_date,
 235      'format=s' => \$format_string,
 236      'amend=s' => \$amend_file,
 237      'append-dot' => \$append_dot,
 238      'cluster!' => \$cluster,
 239      'strip-tab' => \$strip_tab,
 240      'strip-cherry-pick' => \$strip_cherry_pick,
 241      'srcdir=s' => \$srcdir,
 242     ) or usage 1;
 243
 244   defined $since_date
 245     and unshift @ARGV, "--since=$since_date";
 246
 247   # This is a hash that maps an SHA1 to perl code (i.e., s/old/new/)
 248   # that makes a correction in the log or attribution of that commit.
 249   my $amend_code = defined $amend_file ? parse_amend_file $amend_file : {};
 250
 251   my @cmd = ('git',
 252              git_dir_option $srcdir,
 253              qw(log --log-size),
 254              '--pretty=format:%H:%ct  %an  <%ae>%n%n'.$format_string, @ARGV);
 255   open PIPE, '-|', @cmd
 256     or die ("$ME: failed to run '". quoted_cmd (@cmd) ."': $!\n"
 257             . "(Is your Git too old?  Version 1.5.1 or later is required.)\n");
 258
 259   my $prev_multi_paragraph;
 260   my $prev_date_line = '';
 261   my @prev_coauthors = ();
 262   while (1)
 263     {
 264       defined (my $in = <PIPE>)
 265         or last;
 266       $in =~ /^log size (\d+)$/
 267         or die "$ME:$.: Invalid line (expected log size):\n$in";
 268       my $log_nbytes = $1;
 269
 270       my $log;
 271       my $n_read = read PIPE, $log, $log_nbytes;
 272       $n_read == $log_nbytes
 273         or die "$ME:$.: unexpected EOF\n";
 274
 275       # Extract leading hash.
 276       my ($sha, $rest) = split ':', $log, 2;
 277       defined $sha
 278         or die "$ME:$.: malformed log entry\n";
 279       $sha =~ /^[0-9a-fA-F]{40}$/
 280         or die "$ME:$.: invalid SHA1: $sha\n";
 281
 282       # If this commit's log requires any transformation, do it now.
 283       my $code = $amend_code->{$sha};
 284       if (defined $code)
 285         {
 286           eval 'use Safe';
 287           my $s = new Safe;
 288           # Put the unpreprocessed entry into "$_".
 289           $_ = $rest;
 290
 291           # Let $code operate on it, safely.
 292           my $r = $s->reval("$code")
 293             or die "$ME:$.:$sha: failed to eval \"$code\":\n$@\n";
 294
 295           # Note that we've used this entry.
 296           delete $amend_code->{$sha};
 297
 298           # Update $rest upon success.
 299           $rest = $_;
 300         }
 301
 302       # Remove lines inserted by "git cherry-pick".
 303       if ($strip_cherry_pick)
 304         {
 305           $rest =~ s/^\s*Conflicts:\n.*//sm;
 306           $rest =~ s/^\s*\(cherry picked from commit [\da-f]+\)\n//m;
 307         }
 308
 309       my @line = split "\n", $rest;
 310       my $author_line = shift @line;
 311       defined $author_line
 312         or die "$ME:$.: unexpected EOF\n";
 313       $author_line =~ /^(\d+)  (.*>)$/
 314         or die "$ME:$.: Invalid line "
 315           . "(expected date/author/email):\n$author_line\n";
 316
 317       # Format 'Copyright-paperwork-exempt: Yes' as a standard ChangeLog
 318       # `(tiny change)' annotation.
 319       my $tiny = (grep (/^Copyright-paperwork-exempt:\s+[Yy]es$/, @line)
 320                   ? '  (tiny change)' : '');
 321
 322       my $date_line = sprintf "%s  %s$tiny\n",
 323         strftime ("%F", localtime ($1)), $2;
 324
 325       my @coauthors = grep /^Co-authored-by:.*$/, @line;
 326       # Omit meta-data lines we've already interpreted.
 327       @line = grep !/^(?:Signed-off-by:[ ].*>$
 328                        |Co-authored-by:[ ]
 329                        |Copyright-paperwork-exempt:[ ]
 330                        )/x, @line;
 331
 332       # Remove leading and trailing blank lines.
 333       if (@line)
 334         {
 335           while ($line[0] =~ /^\s*$/) { shift @line; }
 336           while ($line[$#line] =~ /^\s*$/) { pop @line; }
 337         }
 338
 339       # Record whether there are two or more paragraphs.
 340       my $multi_paragraph = grep /^\s*$/, @line;
 341
 342       # Format 'Co-authored-by: A U Thor <email@example.com>' lines in
 343       # standard multi-author ChangeLog format.
 344       for (@coauthors)
 345         {
 346           s/^Co-authored-by:\s*/\t    /;
 347           s/\s*</  </;
 348
 349           /<.*?@.*\..*>/
 350             or warn "$ME: warning: missing email address for "
 351               . substr ($_, 5) . "\n";
 352         }
 353
 354       # If clustering of commit messages has been disabled, if this header
 355       # would be different from the previous date/name/email/coauthors header,
 356       # or if this or the previous entry consists of two or more paragraphs,
 357       # then print the header.
 358       if ( ! $cluster
 359           || $date_line ne $prev_date_line
 360           || "@coauthors" ne "@prev_coauthors"
 361           || $multi_paragraph
 362           || $prev_multi_paragraph)
 363         {
 364           $prev_date_line eq ''
 365             or print "\n";
 366           print $date_line;
 367           @coauthors
 368             and print join ("\n", @coauthors), "\n";
 369         }
 370       $prev_date_line = $date_line;
 371       @prev_coauthors = @coauthors;
 372       $prev_multi_paragraph = $multi_paragraph;
 373
 374       # If there were any lines
 375       if (@line == 0)
 376         {
 377           warn "$ME: warning: empty commit message:\n  $date_line\n";
 378         }
 379       else
 380         {
 381           if ($append_dot)
 382             {
 383               # If the first line of the message has enough room, then
 384               if (length $line[0] < 72)
 385                 {
 386                   # append a dot if there is no other punctuation or blank
 387                   # at the end.
 388                   $line[0] =~ /[[:punct:]\s]$/
 389                     or $line[0] .= '.';
 390                 }
 391             }
 392
 393           # Remove one additional leading TAB from each line.
 394           $strip_tab
 395             and map { s/^\t// } @line;
 396
 397           # Prefix each non-empty line with a TAB.
 398           @line = map { length $_ ? "\t$_" : '' } @line;
 399
 400           print "\n", join ("\n", @line), "\n";
 401         }
 402
 403       defined ($in = <PIPE>)
 404         or last;
 405       $in ne "\n"
 406         and die "$ME:$.: unexpected line:\n$in";
 407     }
 408
 409   close PIPE
 410     or die "$ME: error closing pipe from " . quoted_cmd (@cmd) . "\n";
 411   # FIXME-someday: include $PROCESS_STATUS in the diagnostic
 412
 413   # Complain about any unused entry in the --amend=F specified file.
 414   my $fail = 0;
 415   foreach my $sha (keys %$amend_code)
 416     {
 417       warn "$ME:$amend_file: unused entry: $sha\n";
 418       $fail = 1;
 419     }
 420
 421   exit $fail;
 422 }
 423
 424 # Local Variables:
 425 # mode: perl
 426 # indent-tabs-mode: nil
 427 # eval: (add-hook 'write-file-hooks 'time-stamp)
 428 # time-stamp-start: "my $VERSION = '"
 429 # time-stamp-format: "%:y-%02m-%02d %02H:%02M"
 430 # time-stamp-time-zone: "UTC"
 431 # time-stamp-end: "'; # UTC"
 432 # End: