Fix a critical bug in git-cvsexportcommit.perl

[Luke Lee <luke.yx.lee@gmail.com>]

I fixed a long standing bug in git-cvsexportcommit.perl script which
corrupt my Perl code several times. This time I figure it out. It's
about keyword expansion. Take a simple example, a Perl code like this:

    printf "Perl/Tk $Tk::Version ($Tk::platform)\n";

will be incorrectly unexpand by git-cvsexportcommit.perl to:

    printf "Perl/Tk $Tk$Tk::platform)\n";

This happens when I try to export a git commit to a CVS working
directory *with keyword expansion turned off*. git-cvsexportcommit will
try to simulate what CVS does on unexpanding keywords. However, it *DOES
NOT* realize only valid keywords should be unexpanded. Please help apply
this patch.

Thanks.
Luke Lee

>From a33096156e376924d3a7ac2b5a42877f9aedee58 Mon Sep 17 00:00:00 2001
From: Luke Lee <luke.yx.lee@gmail.com>
Date: Wed, 24 Sep 2014 14:38:17 +0800
Subject: [PATCH] Fix a critical bug in git-cvsexportcommit.perl about
 unexpanding keywords which incorrectly delete codes that are not expanded
 keywords.

---
 git-cvsexportcommit.perl | 2 +-
 1 file changed, 1 insertions(+), 1 deletion(-)

diff --git a/git-cvsexportcommit.perl b/git-cvsexportcommit.perl
index d13f02d..bf41a72 100755
--- a/git-cvsexportcommit.perl
+++ b/git-cvsexportcommit.perl
@@ -309,7 +309,8 @@ foreach my $f (@files) {
 	while (<FILTER_IN>)
 	{
 	    my $line = $_;
-	    $line =~ s/\$([A-Z][a-z]+):[^\$]+\$/\$$1\$/g;
+	    $line =~ s/\$(Author|Date|Header|Id|Locker|Log|RCSfile|Revision|Source|State):[^:\$][^\$]+\$/\$$1\$/g;
 	    print FILTER_OUT $line;
 	}
 	close FILTER_IN;
--
2.1.1.303.ga330961.dirty