don't render internal-use pages, and document them

IkiWiki/Render.pm

@@ -193,6 +193,7 @@ sub render ($) { #{{{
 	my $type=pagetype($file);
 	my $srcfile=srcfile($file);
 	if (defined $type) {
+		return if $type=~/^_/;
 		my $page=pagename($file);
 		delete $depends{$page};
 		will_render($page, htmlpage($page), 1);

debian/changelog

@@ -21,6 +21,8 @@ ikiwiki (2.21) UNRELEASED; urgency=low
     tables and the like.
   * prettydate,ddate: Don't ignore time formats passed to displaytime
     function.
+  * Pages with extensions starting with "_" are internal-use, and will
+    not be rendered or web-edited.
 
  -- Joey Hess <joeyh@debian.org>  Fri, 11 Jan 2008 15:09:37 -0500
 

doc/plugins/write.mdwn

@@ -143,6 +143,11 @@ specifies the filename extension that a file must have to be htmlized using
 this plugin. This is how you can add support for new and exciting markup
 languages to ikiwiki.
 
+Note that if you choose a filename extension that starts with "_",
+ikiwiki will not render the page, or allow the page to be edited with the
+web interface. This is useful for certian types of internal-use pages, but
+should generally be avoided.
+
 The function is passed named parameters: "page" and "content" and should
 return the htmlized content.