[PATCH 4/5] imap: avoid warnings on non-slice mailboxes

[Eric Wong <e@yhbt.net>]

Non-slice mailboxes never have messages themselves,
so we must not assume a message exists when sending
untagged EXISTS messages.
---
 lib/PublicInbox/IMAP.pm | 1 +
 t/imapd.t               | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/lib/PublicInbox/IMAP.pm b/lib/PublicInbox/IMAP.pm
index d8c898f4b..8ab4b1e7d 100644
--- a/lib/PublicInbox/IMAP.pm
+++ b/lib/PublicInbox/IMAP.pm
@@ -246,6 +246,7 @@ sub uo2m_extend ($$;$) {
 	my $base = $self->{uid_base};
 	++$beg;
 	my $uids = $self->{ibx}->over->uid_range($beg, $base + UID_SLICE);
+	return $uo2m if !scalar(@$uids);
 	my @tmp; # [$UID_OFFSET] => $MSN
 	my $write_method = $_[2] // 'msg_more';
 	if (ref($uo2m)) {
diff --git a/t/imapd.t b/t/imapd.t
index 1ac6a4ab6..6cfced411 100644
--- a/t/imapd.t
+++ b/t/imapd.t
@@ -87,12 +87,16 @@ my $post_auth_anon_capa = $mic->capability;
 is_deeply($post_auth_anon_capa, $post_login_capa,
 	'auth anon has same capabilities');
 my $e;
+ok($mic->noop, 'NOOP');
+ok($mic->noop, 'NOOP (again)'); # for warnings
 ok(!$mic->examine('foo') && ($e = $@), 'EXAMINE non-existent');
 like($e, qr/\bNO\b/, 'got a NO on EXAMINE for non-existent');
 ok(!$mic->select('foo') && ($e = $@), 'EXAMINE non-existent');
 like($e, qr/\bNO\b/, 'got a NO on EXAMINE for non-existent');
 my $mailbox1 = "inbox.i1.$first_range";
 ok($mic->select('inbox.i1'), 'SELECT on parent succeeds');
+ok($mic->noop, 'NOOP while selected');
+ok($mic->noop, 'NOOP again while selected'); # check warnings later
 ok($mic->select($mailbox1), 'SELECT succeeds');
 ok($mic->examine($mailbox1), 'EXAMINE succeeds');
 my @raw = $mic->status($mailbox1, qw(Messages uidnext uidvalidity));