The function is passed named parameters: "page", "destpage", and "content",
and should return the sanitized content.
+### postscan
+
+ hook(type => "postscan", id => "foo", call => \&postscan);
+
+This hook is called once the full page body is available (but before the
+format hook). The most common use is to update search indexes. Added in
+ikiwiki 2.54.
+
+The function is passed named parameters "page" and "content". Its return
+value is ignored.
+
### format
hook(type => "format", id => "foo", call => \&format);