Is there a better hook to use for this? I need to transform the input before preprocessing.
[[DavidBremner]]
+
+>You can check the type of the page without having to look at the content of the page:
+
+ my $page_file=$pagesources{$page};
+ my $page_type=pagetype($page_file);
+
+>Then you can check whether `$page_type` is "tex".
+>--[[KathrynAndersen]]