[PATCH 4/5] lei ls-mail-sync: fix handling of non-wildcard filters

[Kyle Meyer <kyle@kyleam.com>]

If lei_ls_mail_sync() is given a filter without any wildcards and
--globoff is unspecified, glob2re() will return undef, resulting in
the final regular expression being undefined.  Add a fallback value.
---

  I'm not sure if this is the cleanest approach; repeating
  qr/\Q$filter\E/ seems ugly.  I considered something closer to what
  lei_ls_external() does, but decided against it because it leads to
  --globoff with no filter showing no output, which I think is
  surprising (even if passing --globoff with no filter doesn't make
  any sense).
  
  This probably deserves a test, but I'm out of time for tonight.  If
  the change looks okay, I'm happy to look into adding a test
  tomorrow.

 lib/PublicInbox/LeiLsMailSync.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/PublicInbox/LeiLsMailSync.pm b/lib/PublicInbox/LeiLsMailSync.pm
index 532ea9b5..06e25a63 100644
--- a/lib/PublicInbox/LeiLsMailSync.pm
+++ b/lib/PublicInbox/LeiLsMailSync.pm
@@ -14,7 +14,7 @@ sub lei_ls_mail_sync {
 	my $opt = $lei->{opt};
 	my $re;
 	$re = defined($filter) ? qr/\Q$filter\E/ : qr/./ if $opt->{globoff};
-	$re //= $lei->glob2re($filter // '*');
+	$re //= $lei->glob2re($filter // '*') // qr/\Q$filter\E/;;
 	my @f = $lms->folders;
 	@f = $opt->{'invert-match'} ? grep(!/$re/, @f) : grep(/$re/, @f);
 	if ($opt->{'local'} && !$opt->{remote}) {
-- 
2.31.1