From: Eric Wong <e@yhbt.net>
Date: Sat, 25 Jan 2020 02:47:08 +0000 (+0000)
Subject: mbox: handle empty subjects after dropping "Re:" prefix
X-Git-Tag: v1.3.0~82
X-Git-Url: http://www.git.stargrave.org/?p=public-inbox.git;a=commitdiff_plain;h=0cf1c8b305e15d9ca9869c624a71c96b96a7a5cc

mbox: handle empty subjects after dropping "Re:" prefix

We can't pass empty strings to `to_filename' without
triggering warnings, and `to_filename' on an empty string
makes no sense.
---

diff --git a/lib/PublicInbox/Mbox.pm b/lib/PublicInbox/Mbox.pm
index 1f9ac6ec..cf93e7db 100644
--- a/lib/PublicInbox/Mbox.pm
+++ b/lib/PublicInbox/Mbox.pm
@@ -24,11 +24,10 @@ sub subject_fn ($) {
 	# no need for full Email::MIME, here
 	if ($fn =~ /=\?/) {
 		eval { $fn = Encode::decode('MIME-Header', $fn) };
-		$fn = 'no-subject' if $@;
+		return 'no-subject' if $@;
 	}
 	$fn =~ s/^re:\s+//i;
-	$fn = to_filename($fn);
-	$fn eq '' ? 'no-subject' : $fn;
+	$fn eq '' ? 'no-subject' : to_filename($fn);
 }
 
 sub mb_stream {