forgot to add

IkiWiki/Plugin/version.pm

@@ -0,0 +1,29 @@
+#!/usr/bin/perl
+# Ikiwiki version plugin.
+package IkiWiki::Plugin::version;
+
+use warnings;
+use strict;
+use IkiWiki 2.00;
+
+sub import { #{{{
+	hook(type => "needsbuild", id => "version", call => \&needsbuild);
+	hook(type => "preprocess", id => "version", call => \&preprocess);
+} # }}}
+
+sub needsbuild (@) { #{{{
+	my $needsbuild=shift;
+	foreach my $page (keys %pagestate) {
+		if (exists $pagestate{$page}{version}{shown} &&
+		    $pagestate{$page}{version}{shown} ne $IkiWiki::version) {
+			push @$needsbuild, $pagesources{$page};
+		}
+	}
+} # }}}
+
+sub preprocess (@) { #{{{
+	my %params=@_;
+	$pagestate{$params{destpage}}{version}{shown}=$IkiWiki::version;
+} # }}}
+
+1

doc/plugins/version.mdwn

@@ -0,0 +1,11 @@
+[[template id=plugin name=version author="[[Joey]]"]]
+[[tag type/useful]]
+
+This plugin allows inserting the version of ikiwiki onto a page.
+
+Whenever ikiwiki is upgraded to a new version, the page will be rebuilt,
+updating the version number.
+
+Use is simple:
+
+	\[[version ]]