the state is saved. The function can save other state, modify values before
they're saved, etc.
+## renamepage
+
+ hook(type => "renamepage", id => "foo", call => \&renamepage);
+
+This hook is called by the [[plugins/rename]] plugin when it renames
+something. The hook is passed named parameters: `page`, `oldpage`,
+`newpage`, and `content`, and should try to modify the content to reflect
+the name change. For example, by converting links to point to the new page.
+
## Plugin interface
To import the ikiwiki plugin interface: