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diff --git a/build-aux/gitlog-to-changelog b/build-aux/gitlog-to-changelog
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+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 = '2012-01-24 15:58 (wk)'; # 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
+# Custom bugs bred by Werner Koch
+
+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.
+ --tear-off tear off all commit log lines after a '--' line and
+ skip log entry with the first body line being '--'.
+ --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
+
+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;
+ my $tear_off = 0;
+ my $firstline;
+ GetOptions
+ (
+ help => sub { usage 0 },
+ version => sub { print "$ME version $VERSION\n"; exit },
+ 'since=s' => \$since_date,
+ 'format=s' => \$format_string,
+ 'amend=s' => \$amend_file,
+ 'append-dot' => \$append_dot,
+ 'tear-off' => \$tear_off,
+ ) 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_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";
+
+ # Skip log entries with the default merge commit message.
+ $log =~ /^.*\n\nMerge branch '.*\n\s*/
+ and goto SKIPCOMMIT;
+
+ # Skip log entries if the body starts with a tear off marker.
+ if ($tear_off)
+ {
+ $log =~ /^.*\n\n.*\n--\s*/
+ and goto SKIPCOMMIT;
+ }
+
+ # Extract leading hash.
+ my ($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";
+
+ my $date_line = sprintf "%s $2\n", strftime ("%F", localtime ($1));
+
+ # Format 'Co-authored-by: A U Thor <email@example.com>' lines in
+ # standard multi-author ChangeLog format.
+ my @coauthors = grep /^Co-authored-by:.*$/, @line;
+ 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 the same as the previous date/name/email/
+ # coauthors header, then arrange not to print it.
+ if ($date_line ne $prev_date_line or "@coauthors" ne "@prev_coauthors")
+ {
+ $prev_date_line eq ''
+ or print "\n";
+ print $date_line;
+ @coauthors
+ and print join ("\n", @coauthors), "\n";
+ }
+ $prev_date_line = $date_line;
+ @prev_coauthors = @coauthors;
+
+ # Omit keyword lines like "Signed-off-by:" or "GnuPG-bug-id:"
+ @line = grep !/^[A-Z][A-Za-z]+-[a-z-]+: /, @line;
+
+ # Remove everything after a line with 2 dashes at the beginning.
+ if ($tear_off)
+ {
+ my @tmpline;
+ foreach (@line)
+ {
+ last if /^--\s*$/;
+ push @tmpline,$_;
+ }
+ @line = @tmpline;
+ }
+
+ # Remove leading and trailing blank lines.
+ if (@line)
+ {
+ while ($line[0] =~ /^\s*$/) { shift @line; }
+ while ($line[$#line] =~ /^\s*$/) { pop @line; }
+ }
+
+ # If there were any lines
+ if (@line == 0)
+ {
+ warn "$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;
+
+ $firstline = shift @line;
+ print "\n", $firstline, "\n", "\t+ commit $sha\n";
+ print join ("\n", @line), "\n";
+ }
+
+ SKIPCOMMIT:
+ defined ($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 (wk)"
+# time-stamp-time-zone: "UTC"
+# time-stamp-end: "'; # UTC"
+# End: