+ $ctx->{-html_tip} = '<pre>' . join("\n", @out) . '</pre>';
+ 200;
+}
+
+# only for the t= query parameter passed to overview DB
+sub ts2str ($) { strftime('%Y%m%d%H%M%S', gmtime($_[0])) };
+
+sub str2ts ($) {
+ my ($yyyy, $mon, $dd, $hh, $mm, $ss) = unpack('A4A2A2A2A2A2', $_[0]);
+ timegm($ss, $mm, $hh, $dd, $mon - 1, $yyyy);
+}
+
+sub pagination_footer ($$) {
+ my ($ctx, $latest) = @_;
+ delete $ctx->{qp} or return;
+ my $next = $ctx->{next_page} || '';
+ my $prev = $ctx->{prev_page} || '';
+ if ($prev) {
+ $next = $next ? "$next " : ' ';
+ $prev .= qq! <a\nhref='$latest'>latest</a>!;
+ }
+ "<hr><pre>page: $next$prev</pre>";
+}
+
+sub index_nav { # callback for WwwStream
+ my (undef, $ctx) = @_;
+ pagination_footer($ctx, '.')
+}
+
+sub paginate_recent ($$) {
+ my ($ctx, $lim) = @_;
+ my $t = $ctx->{qp}->{t} || '';
+ my $opts = { limit => $lim };
+ my ($after, $before);
+
+ # Xapian uses '..' but '-' is perhaps friendier to URL linkifiers
+ # if only $after exists "YYYYMMDD.." because "." could be skipped
+ # if interpreted as an end-of-sentence
+ $t =~ s/\A([0-9]{8,14})-// and $after = str2ts($1);
+ $t =~ /\A([0-9]{8,14})\z/ and $before = str2ts($1);
+
+ my $ibx = $ctx->{-inbox};
+ my $msgs = $ibx->recent($opts, $after, $before);
+ my $nr = scalar @$msgs;
+ if ($nr < $lim && defined($after)) {
+ $after = $before = undef;
+ $msgs = $ibx->recent($opts);
+ $nr = scalar @$msgs;
+ }
+ my $more = $nr == $lim;
+ my ($newest, $oldest);
+ if ($nr) {
+ $newest = $msgs->[0]->{ts};
+ $oldest = $msgs->[-1]->{ts};
+ # if we only had $after, our SQL query in ->recent ordered
+ if ($newest < $oldest) {
+ ($oldest, $newest) = ($newest, $oldest);
+ $more = 0 if defined($after) && $after < $oldest;
+ }
+ }
+ if (defined($oldest) && $more) {
+ my $s = ts2str($oldest);
+ $ctx->{next_page} = qq!<a\nhref="?t=$s"\nrel=next>next</a>!;
+ }
+ if (defined($newest) && (defined($before) || defined($after))) {
+ my $s = ts2str($newest);
+ $ctx->{prev_page} = qq!<a\nhref="?t=$s-"\nrel=prev>prev</a>!;
+ }
+ $msgs;
+}
+
+sub index_topics {
+ my ($ctx) = @_;
+ my $msgs = paginate_recent($ctx, 200); # 200 is our window
+ if (@$msgs) {
+ walk_thread(thread_results($ctx, $msgs), $ctx, \&acc_topic);
+ }
+ PublicInbox::WwwStream->response($ctx, dump_topics($ctx), \&index_nav);
+}
+
+sub thread_adj_level {
+ my ($ctx, $level) = @_;
+
+ my $max = $ctx->{cur_level};
+ if ($level <= 0) {
+ return ('', '') if $max == 0; # flat output
+
+ # reset existing lists
+ my $beg = $max > 1 ? ('</ul></li>' x ($max - 1)) : '';
+ $ctx->{cur_level} = 0;
+ ("$beg</ul>", '');
+ } elsif ($level == $max) { # continue existing list
+ qw(<li> </li>);
+ } elsif ($level < $max) {
+ my $beg = $max > 1 ? ('</ul></li>' x ($max - $level)) : '';
+ $ctx->{cur_level} = $level;
+ ("$beg<li>", '</li>');
+ } else { # ($level > $max) # start a new level
+ $ctx->{cur_level} = $level;
+ my $beg = ($max ? '<li>' : '') . '<ul><li>';
+ ($beg, '</li>');
+ }
+}
+
+sub ghost_index_entry {
+ my ($ctx, $level, $node) = @_;
+ my ($beg, $end) = thread_adj_level($ctx, $level);
+ $beg . '<pre>'. ghost_parent($ctx->{-upfx}, $node->{id})
+ . '</pre>' . $end;