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-rw-r--r--doc/forum/understanding_filter_hooks.mdwn8
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diff --git a/doc/forum/understanding_filter_hooks.mdwn b/doc/forum/understanding_filter_hooks.mdwn
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+++ b/doc/forum/understanding_filter_hooks.mdwn
@@ -7,3 +7,11 @@ but right now I have to have a look at the content, which I don't like so much.
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]]