Merge commit 'remotes/smcv/ready/among'

IkiWiki/Plugin/pagestats.pm

@@ -38,13 +38,22 @@ sub preprocess (@) {
 	# Needs to update whenever a page is added or removed, so
 	# register a dependency.
 	add_depends($params{page}, $params{pages});
+	add_depends($params{page}, $params{among}) if exists $params{among};
 	
 	my %counts;
 	my $max = 0;
 	foreach my $page (pagespec_match_list([keys %links],
 			$params{pages}, location => $params{page})) {
 		use IkiWiki::Render;
-		$counts{$page} = scalar(IkiWiki::backlinks($page));
+
+		my @backlinks = IkiWiki::backlink_pages($page);
+
+		if (exists $params{among}) {
+			@backlinks = pagespec_match_list(\@backlinks,
+				$params{among}, location => $params{page});
+		}
+
+		$counts{$page} = scalar(@backlinks);
 		$max = $counts{$page} if $counts{$page} > $max;
 	}
 
@@ -63,6 +72,8 @@ sub preprocess (@) {
 
 		my $res = "<div class='pagecloud'>\n";
 		foreach my $page (sort keys %counts) {
+			next unless $counts{$page} > 0;
+
 			my $class = $classes[$counts{$page} * scalar(@classes) / ($max + 1)];
 			$res .= "<span class=\"$class\">".
 			        htmllink($params{page}, $params{destpage}, $page).

IkiWiki/Render.pm

@@ -24,13 +24,19 @@ sub calculate_backlinks () {
 	$backlinks_calculated=1;
 }
 
-sub backlinks ($) {
+sub backlink_pages ($) {
 	my $page=shift;
 
 	calculate_backlinks();
 
+	return keys %{$backlinks{$page}};
+}
+
+sub backlinks ($) {
+	my $page=shift;
+
 	my @links;
-	foreach my $p (keys %{$backlinks{$page}}) {
+	foreach my $p (backlink_pages($page)) {
 		my $href=urlto($p, $page);
                 
 		# Trim common dir prefixes from both pages.

doc/ikiwiki/directive/pagestats.mdwn

@@ -12,4 +12,14 @@ And here's how to create a table of all the pages on the wiki:
 
 	\[[!pagestats style="table"]]
 
+The optional `among` parameter limits counting to pages that match a
+[[ikiwiki/PageSpec]]. For instance, to display a cloud of tags used on blog
+entries, you could use:
+
+	\[[!pagestats pages="tags/*" among="blog/posts/*"]]
+
+or to display a cloud of tags related to Linux, you could use:
+
+	\[[!pagestats pages="tags/* and not tags/linux" among="tagged(linux)"]]
+
 [[!meta robots="noindex, follow"]]