--- /dev/null
+#!/usr/bin/perl
+# Convert git log output to ChangeLog format.
+
+my $VERSION = '2009-06-04 08:53'; # 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, 2009 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:
+
+ --since=DATE convert only the logs since DATE;
+ the default is to convert all log entries.
+
+ --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
+
+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 $_} @_);
+}
+
+{
+ my $since_date = '1970-01-01 UTC';
+ GetOptions
+ (
+ help => sub { usage 0 },
+ version => sub { print "$ME version $VERSION\n"; exit },
+ 'since=s' => \$since_date,
+ ) or usage 1;
+
+ my @cmd = (qw (git log --log-size), "--since=$since_date",
+ '--pretty=format:%ct %an <%ae>%n%n%s%n%b%n', @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_date_line = '';
+ 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";
+
+ my @line = split "\n", $log;
+ 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";
+
+ my $date_line = sprintf "%s $2\n", strftime ("%F", localtime ($1));
+ # If this line would be the same as the previous date/name/email
+ # line, then arrange not to print it.
+ if ($date_line ne $prev_date_line)
+ {
+ $prev_date_line eq ''
+ or print "\n";
+ print $date_line;
+ }
+ $prev_date_line = $date_line;
+
+ # Omit "Signed-off-by..." lines.
+ @line = grep !/^Signed-off-by: .*>$/, @line;
+
+ # If there were any lines
+ if (@line == 0)
+ {
+ warn "$ME: warning: empty commit message:\n $date_line\n";
+ }
+ else
+ {
+ # Remove leading and trailing blank lines.
+ while ($line[0] =~ /^\s*$/) { shift @line; }
+ while ($line[$#line] =~ /^\s*$/) { pop @line; }
+
+ # 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
+}
+
+# Local Variables:
+# 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:
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