update-copyright: rename some variables

[gnulib.git] / build-aux / gitlog-to-changelog

diff --git a/build-aux/gitlog-to-changelog b/build-aux/gitlog-to-changelog
index 1b7a659..1cc53eb 100755 (executable)
--- a/build-aux/gitlog-to-changelog
+++ b/build-aux/gitlog-to-changelog
@@ -1,13 +1,13 @@
 #!/usr/bin/perl
 # Convert git log output to ChangeLog format.
 
-my $VERSION = '2008-02-09 13:52'; # UTC
+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 Free Software Foundation, Inc.
+# 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
@@ -50,9 +50,11 @@ sub usage ($)
   else
     {
       print $STREAM <<EOF;
-Usage: $ME [OPTIONS]
+Usage: $ME [OPTIONS] [ARGS]
 
-Convert git log output to ChangeLog format.
+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:
 
@@ -65,6 +67,7 @@ OPTIONS:
 EXAMPLE:
 
   $ME --since=2008-01-01 > ChangeLog
+  $ME -- -n 5 foo > last-5-commits-to-branch-foo
 
 EOF
     }
@@ -100,13 +103,11 @@ sub quoted_cmd(@)
      'since=s' => \$since_date,
     ) or usage 1;
 
-  @ARGV
-    and (warn "$ME: too many arguments\n"), usage 1;
-
   my @cmd = (qw (git log --log-size), "--since=$since_date",
-             '--pretty=format:%at  %an  <%ae>%n%n%s%n%b%n');
+             '--pretty=format:%ct  %an  <%ae>%n%n%s%n%b%n', @ARGV);
   open PIPE, '-|', @cmd
-    or die "$ME: failed to run `". quoted_cmd (@cmd) ."': $!\n";
+    or die ("$ME: failed to run `". quoted_cmd (@cmd) ."': $!\n"
+            . "(Is your Git too old?  Version 1.5.1 or later is required.)\n");
 
   my $prev_date_line = '';
   while (1)
@@ -144,14 +145,22 @@ sub quoted_cmd(@)
       # Omit "Signed-off-by..." lines.
       @line = grep !/^Signed-off-by: .*>$/, @line;
 
-      # Remove leading and trailing blank lines.
-      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  $date_line\n";
+        }
+      else
+        {
+          # Remove leading and trailing blank lines.
+          while ($line[0] =~ /^\s*$/) { shift @line; }
+          while ($line[$#line] =~ /^\s*$/) { pop @line; }
 
-      # Prefix each non-empty line with a TAB.
-      @line = map { length $_ ? "\t$_" : '' } @line;
+          # Prefix each non-empty line with a TAB.
+          @line = map { length $_ ? "\t$_" : '' } @line;
 
-      print "\n", join ("\n", @line), "\n";
+          print "\n", join ("\n", @line), "\n";
+        }
 
       defined ($in = <PIPE>)
         or last;