config: avoid eidx_key and newsgroup conflicts

Start lowercasing newsgroup names automatically since uppercase
names are incompatible with IMAP and POP3 and also causes
problems with both -extindex and -cindex.

We'll also warn on eidx_key and newsgroup conflicts to avoid
sometimes subtle breakage when using -extindex and -cindex.

1 files changed, 2 insertions, 7 deletions

diff --git a/lib/PublicInbox/IMAPD.pm b/lib/PublicInbox/IMAPD.pm
index bdadb7a3..42dc2a9f 100644
--- a/lib/PublicInbox/IMAPD.pm
+++ b/lib/PublicInbox/IMAPD.pm
@@ -27,13 +27,8 @@ sub _refresh_ibx { # pi_cfg->each_inbox cb
         my ($ibx, $imapd, $cache, $dummies) = @_;
         my $ngname = $ibx->{newsgroup} // return;
 
-        # We require lower-case since IMAP mailbox names are
-        # case-insensitive (but -nntpd matches INN in being
-        # case-sensitive)
-        if ($ngname =~ m![^a-z0-9/_\.\-\~\@\+\=:]! ||
-                        # don't confuse with 50K slices
-                        $ngname =~ /\.[0-9]+\z/) {
-                warn "mailbox name invalid: newsgroup=`$ngname'\n";
+        if ($ngname =~ /\.[0-9]+\z/) { # don't confuse with 50K slices
+                warn "E: mailbox name invalid: newsgroup=`$ngname' (ignored)\n";
                 return;
         }
         my $ce = $cache->{$ngname};