toc: Add startlevel parameter. (kerravonsen)

IkiWiki/Plugin/toc.pm

@@ -53,8 +53,8 @@ sub format (@) {
 	my $page="";
 	my $index="";
 	my %anchors;
-	my $curlevel;
-	my $startlevel=0;
+	my $startlevel=($params{startlevel} ? $params{startlevel} : 0);
+	my $curlevel=$startlevel-1;
 	my $liststarted=0;
 	my $indent=sub { "\t" x $curlevel };
 	$p->handler(start => sub {
@@ -65,12 +65,17 @@ sub format (@) {
 			my $anchor="index".++$anchors{$level}."h$level";
 			$page.="$text<a name=\"$anchor\"></a>";
 	
-			# Take the first header level seen as the topmost level,
+			# Unless we're given startlevel as a parameter,
+			# take the first header level seen as the topmost level,
 			# even if there are higher levels seen later on.
 			if (! $startlevel) {
 				$startlevel=$level;
 				$curlevel=$startlevel-1;
 			}
+			elsif (defined $params{startlevel} &&
+			       $level < $params{startlevel}) {
+			    return;
+			}
 			elsif ($level < $startlevel) {
 				$level=$startlevel;
 			}

debian/changelog

@@ -1,6 +1,7 @@
 ikiwiki (3.20091219) UNRELEASED; urgency=low
 
   * pagestats: Add show parameter. Closes: #562129 (David Paleino)
+  * toc: Add startlevel parameter. (kerravonsen)
 
  -- Joey Hess <joeyh@debian.org>  Fri, 25 Dec 2009 14:31:22 -0500
 

doc/ikiwiki/directive/toc.mdwn

@@ -14,6 +14,12 @@ the `levels` parameter:
 The toc directive will take the level of the first header as the topmost
 level, even if there are higher levels seen later in the file.
 
+To create a table of contents that only shows headers starting with a given
+level, use the `startlevel` parameter. For example, to show only h2 and
+smaller headers:
+
+	\[[!toc startlevel=2]]
+
 The table of contents will be created as an ordered list. If you want
 an unordered list instead, you can change the list-style in your local
 style sheet.