Extend gitlog-to-changelog option --tear-off.

--
It is now possible to suppress git log entries from being copied to
the ChangeLog by using the option --tear-off and having a "--" line
as the first line in the body (like this very log entry).

Note that the GnuPG master branch is the canonical source for our
version of the gitlog-to-changelog script.

scripts/gitlog-to-changelog

@@ -3,13 +3,13 @@ eval '(exit $?0)' && eval 'exec perl -wS "$0" ${1+"$@"}'
     if 0;
 # Convert git log output to ChangeLog format.
 
-my $VERSION = '2012-01-20 10:14'; # UTC
+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) 2008-2011 Free Software Foundation, Inc.
+# 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
@@ -25,6 +25,7 @@ my $VERSION = '2012-01-20 10:14'; # UTC
 # 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;
@@ -64,7 +65,8 @@ OPTIONS:
                   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.
+   --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;
@@ -222,6 +224,13 @@ sub parse_amend_file($)
       $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 $sha
@@ -360,7 +369,7 @@ sub parse_amend_file($)
 # 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-format: "%:y-%02m-%02d %02H:%02M (wk)"
 # time-stamp-time-zone: "UTC"
 # time-stamp-end: "'; # UTC"
 # End: