code.delx.au - gnu-emacs/blob - 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 = '2015-03-21 01:01'; # 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) 2008-2015 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    --until=DATE convert only the logs older than DATE.
  76    --ignore-matching=PAT ignore commit messages whose first lines match PAT.
  77    --format=FMT set format string for commit subject and body;
  78                   see 'man git-log' for the list of format metacharacters;
  79                   the default is '%s%n%b%n'
  80    --strip-tab  remove one additional leading TAB from commit message lines.
  81    --strip-cherry-pick  remove data inserted by "git cherry-pick";
  82                   this includes the "cherry picked from commit ..." line,
  83                   and the possible final "Conflicts:" paragraph.
  84    --help       display this help and exit
  85    --version    output version information and exit
  86
  87 EXAMPLE:
  88
  89   $ME --since=2008-01-01 > ChangeLog
  90   $ME -- -n 5 foo > last-5-commits-to-branch-foo
  91
  92 SPECIAL SYNTAX:
  93
  94 The following types of strings are interpreted specially when they appear
  95 at the beginning of a log message line.  They are not copied to the output.
  96
  97   Copyright-paperwork-exempt: Yes
  98     Append the "(tiny change)" notation to the usual "date name email"
  99     ChangeLog header to mark a change that does not require a copyright
 100     assignment.
 101   Co-authored-by: Joe User <user\@example.com>
 102     List the specified name and email address on a second
 103     ChangeLog header, denoting a co-author.
 104   Signed-off-by: Joe User <user\@example.com>
 105     These lines are simply elided.
 106
 107 In a FILE specified via --amend, comment lines (starting with "#") are ignored.
 108 FILE must consist of <SHA,CODE+> pairs where SHA is a 40-byte SHA1 (alone on
 109 a line) referring to a commit in the current project, and CODE refers to one
 110 or more consecutive lines of Perl code.  Pairs must be separated by one or
 111 more blank line.
 112
 113 Here is sample input for use with --amend=FILE, from coreutils:
 114
 115 3a169f4c5d9159283548178668d2fae6fced3030
 116 # fix typo in title:
 117 s/all tile types/all file types/
 118
 119 1379ed974f1fa39b12e2ffab18b3f7a607082202
 120 # Due to a bug in vc-dwim, I mis-attributed a patch by Paul to myself.
 121 # Change the author to be Paul.  Note the escaped "@":
 122 s,Jim .*>,Paul Eggert <eggert\\\@cs.ucla.edu>,
 123
 124 EOF
 125     }
 126   exit $exit_code;
 127 }
 128
 129 # If the string $S is a well-behaved file name, simply return it.
 130 # If it contains white space, quotes, etc., quote it, and return the new string.
 131 sub shell_quote($)
 132 {
 133   my ($s) = @_;
 134   if ($s =~ m![^\w+/.,-]!)
 135     {
 136       # Convert each single quote to '\''
 137       $s =~ s/\'/\'\\\'\'/g;
 138       # Then single quote the string.
 139       $s = "'$s'";
 140     }
 141   return $s;
 142 }
 143
 144 sub quoted_cmd(@)
 145 {
 146   return join (' ', map {shell_quote $_} @_);
 147 }
 148
 149 # Parse file F.
 150 # Comment lines (starting with "#") are ignored.
 151 # F must consist of <SHA,CODE+> pairs where SHA is a 40-byte SHA1
 152 # (alone on a line) referring to a commit in the current project, and
 153 # CODE refers to one or more consecutive lines of Perl code.
 154 # Pairs must be separated by one or more blank line.
 155 sub parse_amend_file($)
 156 {
 157   my ($f) = @_;
 158
 159   open F, '<', $f
 160     or die "$ME: $f: failed to open for reading: $!\n";
 161
 162   my $fail;
 163   my $h = {};
 164   my $in_code = 0;
 165   my $sha;
 166   while (defined (my $line = <F>))
 167     {
 168       $line =~ /^\#/
 169         and next;
 170       chomp $line;
 171       $line eq ''
 172         and $in_code = 0, next;
 173
 174       if (!$in_code)
 175         {
 176           $line =~ /^([0-9a-fA-F]{40})$/
 177             or (warn "$ME: $f:$.: invalid line; expected an SHA1\n"),
 178               $fail = 1, next;
 179           $sha = lc $1;
 180           $in_code = 1;
 181           exists $h->{$sha}
 182             and (warn "$ME: $f:$.: duplicate SHA1\n"),
 183               $fail = 1, next;
 184         }
 185       else
 186         {
 187           $h->{$sha} ||= '';
 188           $h->{$sha} .= "$line\n";
 189         }
 190     }
 191   close F;
 192
 193   $fail
 194     and exit 1;
 195
 196   return $h;
 197 }
 198
 199 # git_dir_option $SRCDIR
 200 #
 201 # From $SRCDIR, the --git-dir option to pass to git (none if $SRCDIR
 202 # is undef).  Return as a list (0 or 1 element).
 203 sub git_dir_option($)
 204 {
 205   my ($srcdir) = @_;
 206   my @res = ();
 207   if (defined $srcdir)
 208     {
 209       my $qdir = shell_quote $srcdir;
 210       my $cmd = "cd $qdir && git rev-parse --show-toplevel";
 211       my $qcmd = shell_quote $cmd;
 212       my $git_dir = qx($cmd);
 213       defined $git_dir
 214         or die "$ME: cannot run $qcmd: $!\n";
 215       $? == 0
 216         or die "$ME: $qcmd had unexpected exit code or signal ($?)\n";
 217       chomp $git_dir;
 218       push @res, "--git-dir=$git_dir/.git";
 219     }
 220   @res;
 221 }
 222
 223 {
 224   my $since_date;
 225   my $until_date;
 226   my $format_string = '%s%n%b%n';
 227   my $amend_file;
 228   my $append_dot = 0;
 229   my $cluster = 1;
 230   my $ignore_matching;
 231   my $strip_tab = 0;
 232   my $strip_cherry_pick = 0;
 233   my $srcdir;
 234   GetOptions
 235     (
 236      help => sub { usage 0 },
 237      version => sub { print "$ME version $VERSION\n"; exit },
 238      'since=s' => \$since_date,
 239      'until=s' => \$until_date,
 240      'format=s' => \$format_string,
 241      'amend=s' => \$amend_file,
 242      'append-dot' => \$append_dot,
 243      'cluster!' => \$cluster,
 244      'ignore-matching=s' => \$ignore_matching,
 245      'strip-tab' => \$strip_tab,
 246      'strip-cherry-pick' => \$strip_cherry_pick,
 247      'srcdir=s' => \$srcdir,
 248     ) or usage 1;
 249
 250   defined $since_date
 251     and unshift @ARGV, "--since=$since_date";
 252   defined $until_date
 253     and unshift @ARGV, "--until=$until_date";
 254
 255   # This is a hash that maps an SHA1 to perl code (i.e., s/old/new/)
 256   # that makes a correction in the log or attribution of that commit.
 257   my $amend_code = defined $amend_file ? parse_amend_file $amend_file : {};
 258
 259   my @cmd = ('git',
 260              git_dir_option $srcdir,
 261              qw(log --log-size),
 262              '--pretty=format:%H:%ct  %an  <%ae>%n%n'.$format_string, @ARGV);
 263   open PIPE, '-|', @cmd
 264     or die ("$ME: failed to run '". quoted_cmd (@cmd) ."': $!\n"
 265             . "(Is your Git too old?  Version 1.5.1 or later is required.)\n");
 266
 267   my $prev_multi_paragraph;
 268   my $prev_date_line = '';
 269   my @prev_coauthors = ();
 270   while (1)
 271     {
 272       defined (my $in = <PIPE>)
 273         or last;
 274       $in =~ /^log size (\d+)$/
 275         or die "$ME:$.: Invalid line (expected log size):\n$in";
 276       my $log_nbytes = $1;
 277
 278       my $log;
 279       my $n_read = read PIPE, $log, $log_nbytes;
 280       $n_read == $log_nbytes
 281         or die "$ME:$.: unexpected EOF\n";
 282
 283       # Extract leading hash.
 284       my ($sha, $rest) = split ':', $log, 2;
 285       defined $sha
 286         or die "$ME:$.: malformed log entry\n";
 287       $sha =~ /^[0-9a-fA-F]{40}$/
 288         or die "$ME:$.: invalid SHA1: $sha\n";
 289
 290       # If this commit's log requires any transformation, do it now.
 291       my $code = $amend_code->{$sha};
 292       if (defined $code)
 293         {
 294           eval 'use Safe';
 295           my $s = new Safe;
 296           # Put the unpreprocessed entry into "$_".
 297           $_ = $rest;
 298
 299           # Let $code operate on it, safely.
 300           my $r = $s->reval("$code")
 301             or die "$ME:$.:$sha: failed to eval \"$code\":\n$@\n";
 302
 303           # Note that we've used this entry.
 304           delete $amend_code->{$sha};
 305
 306           # Update $rest upon success.
 307           $rest = $_;
 308         }
 309
 310       # Remove lines inserted by "git cherry-pick".
 311       if ($strip_cherry_pick)
 312         {
 313           $rest =~ s/^\s*Conflicts:\n.*//sm;
 314           $rest =~ s/^\s*\(cherry picked from commit [\da-f]+\)\n//m;
 315         }
 316
 317       my @line = split /\s*\n/, $rest;
 318       my $author_line = shift @line;
 319       defined $author_line
 320         or die "$ME:$.: unexpected EOF\n";
 321       $author_line =~ /^(\d+)  (.*>)$/
 322         or die "$ME:$.: Invalid line "
 323           . "(expected date/author/email):\n$author_line\n";
 324
 325       # Format 'Copyright-paperwork-exempt: Yes' as a standard ChangeLog
 326       # `(tiny change)' annotation.
 327       my $tiny = (grep (/^Copyright-paperwork-exempt:\s+[Yy]es$/, @line)
 328                   ? '  (tiny change)' : '');
 329
 330       my $date_line = sprintf "%s  %s$tiny\n",
 331         strftime ("%F", localtime ($1)), $2;
 332
 333       my @coauthors = grep /^Co-authored-by:.*$/, @line;
 334       # Omit meta-data lines we've already interpreted.
 335       @line = grep !/^(?:Signed-off-by:[ ].*>$
 336                        |Co-authored-by:[ ]
 337                        |Copyright-paperwork-exempt:[ ]
 338                        )/x, @line;
 339
 340       # Remove leading and trailing blank lines.
 341       if (@line)
 342         {
 343           while ($line[0] =~ /^\s*$/) { shift @line; }
 344           while ($line[$#line] =~ /^\s*$/) { pop @line; }
 345         }
 346
 347       # Ignore commits that match the --ignore-matching pattern, if specified.
 348       if (! (defined $ignore_matching
 349              && @line && $line[0] =~ /$ignore_matching/))
 350         {
 351           # Record whether there are two or more paragraphs.
 352           my $multi_paragraph = grep /^\s*$/, @line;
 353
 354           # Format 'Co-authored-by: A U Thor <email@example.com>' lines in
 355           # standard multi-author ChangeLog format.
 356           for (@coauthors)
 357             {
 358               s/^Co-authored-by:\s*/\t    /;
 359               s/\s*</  </;
 360
 361               /<.*?@.*\..*>/
 362                 or warn "$ME: warning: missing email address for "
 363                   . substr ($_, 5) . "\n";
 364             }
 365
 366           # If clustering of commit messages has been disabled, if this header
 367           # would be different from the previous date/name/etc. header,
 368           # or if this or the previous entry consists of two or more paragraphs,
 369           # then print the header.
 370           if ( ! $cluster
 371               || $date_line ne $prev_date_line
 372               || "@coauthors" ne "@prev_coauthors"
 373               || $multi_paragraph
 374               || $prev_multi_paragraph)
 375             {
 376               $prev_date_line eq ''
 377                 or print "\n";
 378               print $date_line;
 379               @coauthors
 380                 and print join ("\n", @coauthors), "\n";
 381             }
 382           $prev_date_line = $date_line;
 383           @prev_coauthors = @coauthors;
 384           $prev_multi_paragraph = $multi_paragraph;
 385
 386           # If there were any lines
 387           if (@line == 0)
 388             {
 389               warn "$ME: warning: empty commit message:\n  $date_line\n";
 390             }
 391           else
 392             {
 393               if ($append_dot)
 394                 {
 395                   # If the first line of the message has enough room, then
 396                   if (length $line[0] < 72)
 397                     {
 398                       # append a dot if there is no other punctuation or blank
 399                       # at the end.
 400                       $line[0] =~ /[[:punct:]\s]$/
 401                         or $line[0] .= '.';
 402                     }
 403                 }
 404
 405               # Remove one additional leading TAB from each line.
 406               $strip_tab
 407                 and map { s/^\t// } @line;
 408
 409               # Prefix each non-empty line with a TAB.
 410               @line = map { length $_ ? "\t$_" : '' } @line;
 411
 412               print "\n", join ("\n", @line), "\n";
 413             }
 414         }
 415
 416       defined ($in = <PIPE>)
 417         or last;
 418       $in ne "\n"
 419         and die "$ME:$.: unexpected line:\n$in";
 420     }
 421
 422   close PIPE
 423     or die "$ME: error closing pipe from " . quoted_cmd (@cmd) . "\n";
 424   # FIXME-someday: include $PROCESS_STATUS in the diagnostic
 425
 426   # Complain about any unused entry in the --amend=F specified file.
 427   my $fail = 0;
 428   foreach my $sha (keys %$amend_code)
 429     {
 430       warn "$ME:$amend_file: unused entry: $sha\n";
 431       $fail = 1;
 432     }
 433
 434   exit $fail;
 435 }
 436
 437 # Local Variables:
 438 # mode: perl
 439 # indent-tabs-mode: nil
 440 # eval: (add-hook 'write-file-hooks 'time-stamp)
 441 # time-stamp-start: "my $VERSION = '"
 442 # time-stamp-format: "%:y-%02m-%02d %02H:%02M"
 443 # time-stamp-time-zone: "UTC"
 444 # time-stamp-end: "'; # UTC"
 445 # End: