gitlog-to-changelog

   1 #!/usr/bin/perl
   2 # Convert git log output to ChangeLog format.
   3
   4 my $VERSION = '2008-12-21 12:07'; # UTC
   5 # The definition above must lie within the first 8 lines in order
   6 # for the Emacs time-stamp write hook (at end) to update it.
   7 # If you change this file with Emacs, please let the write hook
   8 # do its job.  Otherwise, update this string manually.
   9
  10 # Copyright (C) 2008 Free Software Foundation, Inc.
  11
  12 # This program is free software: you can redistribute it and/or modify
  13 # it under the terms of the GNU General Public License as published by
  14 # the Free Software Foundation, either version 3 of the License, or
  15 # (at your option) any later version.
  16
  17 # This program is distributed in the hope that it will be useful,
  18 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 # GNU General Public License for more details.
  21
  22 # You should have received a copy of the GNU General Public License
  23 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 # Written by Jim Meyering
  26
  27 use strict;
  28 use warnings;
  29 use Getopt::Long;
  30 use POSIX qw(strftime);
  31
  32 (my $ME = $0) =~ s|.*/||;
  33
  34 # use File::Coda; # http://meyering.net/code/Coda/
  35 END {
  36   defined fileno STDOUT or return;
  37   close STDOUT and return;
  38   warn "$ME: failed to close standard output: $!\n";
  39   $? ||= 1;
  40 }
  41
  42 sub usage ($)
  43 {
  44   my ($exit_code) = @_;
  45   my $STREAM = ($exit_code == 0 ? *STDOUT : *STDERR);
  46   if ($exit_code != 0)
  47     {
  48       print $STREAM "Try `$ME --help' for more information.\n";
  49     }
  50   else
  51     {
  52       print $STREAM <<EOF;
  53 Usage: $ME [OPTIONS] [ARGS]
  54
  55 Convert git log output to ChangeLog format.  If present, any ARGS
  56 are passed to "git log".  To avoid ARGS being parsed as options to
  57 $ME, they may be preceded by '--'.
  58
  59 OPTIONS:
  60
  61    --since=DATE convert only the logs since DATE;
  62                   the default is to convert all log entries.
  63
  64    --help       display this help and exit
  65    --version    output version information and exit
  66
  67 EXAMPLE:
  68
  69   $ME --since=2008-01-01 > ChangeLog
  70   $ME -- -n 5 foo > last-5-commits-to-branch-foo
  71
  72 EOF
  73     }
  74   exit $exit_code;
  75 }
  76
  77 # If the string $S is a well-behaved file name, simply return it.
  78 # If it contains white space, quotes, etc., quote it, and return the new string.
  79 sub shell_quote($)
  80 {
  81   my ($s) = @_;
  82   if ($s =~ m![^\w+/.,-]!)
  83     {
  84       # Convert each single quote to '\''
  85       $s =~ s/\'/\'\\\'\'/g;
  86       # Then single quote the string.
  87       $s = "'$s'";
  88     }
  89   return $s;
  90 }
  91
  92 sub quoted_cmd(@)
  93 {
  94   return join (' ', map {shell_quote $_} @_);
  95 }
  96
  97 {
  98   my $since_date = '1970-01-01 UTC';
  99   GetOptions
 100     (
 101      help => sub { usage 0 },
 102      version => sub { print "$ME version $VERSION\n"; exit },
 103      'since=s' => \$since_date,
 104     ) or usage 1;
 105
 106   my @cmd = (qw (git log --log-size), "--since=$since_date",
 107              '--pretty=format:%ct  %an  <%ae>%n%n%s%n%b%n', @ARGV);
 108   open PIPE, '-|', @cmd
 109     or die ("$ME: failed to run `". quoted_cmd (@cmd) ."': $!\n"
 110             . "(Is your Git too old?  Version 1.5.1 or later is required.)\n");
 111
 112   my $prev_date_line = '';
 113   while (1)
 114     {
 115       defined (my $in = <PIPE>)
 116         or last;
 117       $in =~ /^log size (\d+)$/
 118         or die "$ME:$.: Invalid line (expected log size):\n$in";
 119       my $log_nbytes = $1;
 120
 121       my $log;
 122       my $n_read = read PIPE, $log, $log_nbytes;
 123       $n_read == $log_nbytes
 124         or die "$ME:$.: unexpected EOF\n";
 125
 126       my @line = split "\n", $log;
 127       my $author_line = shift @line;
 128       defined $author_line
 129         or die "$ME:$.: unexpected EOF\n";
 130       $author_line =~ /^(\d+)  (.*>)$/
 131         or die "$ME:$.: Invalid line "
 132           . "(expected date/author/email):\n$author_line\n";
 133
 134       my $date_line = sprintf "%s  $2\n", strftime ("%F", localtime ($1));
 135       # If this line would be the same as the previous date/name/email
 136       # line, then arrange not to print it.
 137       if ($date_line ne $prev_date_line)
 138         {
 139           $prev_date_line eq ''
 140             or print "\n";
 141           print $date_line;
 142         }
 143       $prev_date_line = $date_line;
 144
 145       # Omit "Signed-off-by..." lines.
 146       @line = grep !/^Signed-off-by: .*>$/, @line;
 147
 148       # Remove leading and trailing blank lines.
 149       while ($line[0] =~ /^\s*$/) { shift @line; }
 150       while ($line[$#line] =~ /^\s*$/) { pop @line; }
 151
 152       # Prefix each non-empty line with a TAB.
 153       @line = map { length $_ ? "\t$_" : '' } @line;
 154
 155       print "\n", join ("\n", @line), "\n";
 156
 157       defined ($in = <PIPE>)
 158         or last;
 159       $in ne "\n"
 160         and die "$ME:$.: unexpected line:\n$in";
 161     }
 162
 163   close PIPE
 164     or die "$ME: error closing pipe from " . quoted_cmd (@cmd) . "\n";
 165   # FIXME-someday: include $PROCESS_STATUS in the diagnostic
 166 }
 167
 168 # Local Variables:
 169 # indent-tabs-mode: nil
 170 # eval: (add-hook 'write-file-hooks 'time-stamp)
 171 # time-stamp-start: "my $VERSION = '"
 172 # time-stamp-format: "%:y-%02m-%02d %02H:%02M"
 173 # time-stamp-time-zone: "UTC"
 174 # time-stamp-end: "'; # UTC"
 175 # End: