index: add prev/next index navigation

This helps readers jump around more quickly when there are
large messages.

diff --git a/lib/PublicInbox/Feed.pm b/lib/PublicInbox/Feed.pm
index 1fa38bf111749af663790bc86d8143b57d8bd486..791d198aecbb3e67bfd68df11da65cdc591225ae 100644 (file)
--- a/lib/PublicInbox/Feed.pm
+++ b/lib/PublicInbox/Feed.pm
@@ -87,30 +87,33 @@ sub generate_html_index {
        });
 
        # except we sort top-level messages reverse chronologically
-       my $state = [ time, {}, $first ];
+       my $state = [ time, {}, $first, 0 ];
        for (sort { (eval { $b->message->header('X-PI-Date') } || 0) <=>
                    (eval { $a->message->header('X-PI-Date') } || 0)
                  } $th->rootset) {
                dump_msg($_, 0, \$html, $state);
        }
-       $state = undef;
        Email::Address->purge_cache;
 
-       my $footer = nav_footer($args->{cgi}, $first, $last, $feed_opts);
-       my $list_footer = $args->{footer};
-       $footer .= "\n" . $list_footer if ($footer && $list_footer);
-       $footer = "<hr />" . PRE_WRAP . "$footer</pre>" if $footer;
+       my $footer = nav_footer($args->{cgi}, $last, $feed_opts, $state);
+       if ($footer) {
+               my $list_footer = $args->{footer};
+               $footer .= "\n" . $list_footer if $list_footer;
+               $footer = "<hr />" . PRE_WRAP . "$footer</pre>";
+       }
        $html . "</pre>$footer</html>";
 }
 
 # private subs
 
 sub nav_footer {
-       my ($cgi, $first, $last, $feed_opts) = @_;
+       my ($cgi, $last, $feed_opts, $state) = @_;
        $cgi or return '';
        my $old_r = $cgi->param('r');
        my $head = '    ';
        my $next = '    ';
+       my $first = $state->[2];
+       my $anchor = $state->[3];
 
        if ($last) {
                $next = qq!<a\nhref="?r=$last">next</a>!;
@@ -121,7 +124,7 @@ sub nav_footer {
        }
        my $atom = "<a\nhref=\"$feed_opts->{atomurl}\">atom</a>";
        my $permalink = "<a\nhref=\"?r=$first\">permalink</a>";
-       "$next $head $atom $permalink";
+       "<a\nname=\"s$anchor\">page:</a> $next $head $atom $permalink";
 }
 
 sub each_recent_blob {

diff --git a/lib/PublicInbox/View.pm b/lib/PublicInbox/View.pm
index b3797d39ae06a6ea4747d7bd0f15b3a462b770a0..ce63f7d47aa8ab9716d7c3d08ca0bbcdd3344233 100644 (file)
--- a/lib/PublicInbox/View.pm
+++ b/lib/PublicInbox/View.pm
@@ -45,6 +45,8 @@ sub feed_entry {
 sub index_entry {
        my ($class, $mime, $level, $state) = @_;
        my ($now, $seen, $first) = @$state;
+       my $midx = $state->[3]++;
+       my ($prev, $next) = ($midx - 1, $midx + 1);
        my $rv = '';
        my $part_nr = 0;
        my $enc_msg = enc_for($mime->header("Content-Type"));
@@ -75,7 +77,13 @@ sub index_entry {
        }
        $ts = POSIX::strftime($fmt, gmtime($ts));
 
-       $rv .= "$pfx<a\nname=\"$name\"><b>$subj</b> $from - $ts</a>\n\n";
+       $rv .= "$pfx<a\nname=\"$name\"></a>" .
+               "<a\nname=\"s$midx\"></a>" .
+               "<b>$subj</b> $from - $ts\n" .
+               "$pfx<a\nhref=\"#s$next\">next</a>";
+
+       $rv .= " <a\nhref=\"#s$prev\">prev</a>" if $prev >= 0;
+       $rv .= "\n";
 
        my $irp = $header_obj->header_raw('In-Reply-To');
        my ($anchor_idx, $anchor);