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+For one type of plugin, see [[todo/PluggableRenderers]]. 
+
+A plugin system should ideally support things like:
+
+* [[todo/lists]] of pages, of mising pages / broken links, of registered users, etc
+* a [[todo/link_map]]
+* [[todo/sigs]]
+* [[pageindexes]]
+* Wiki stats, such as the total number of pages, total number of links, most linked to pages, etc, etc.
+* 
+
+Considering ikiwiki plugins, one idea I have is to make the [[PreProcessorDirective]]s be a plugin. A setting in the config file would enable various plusins, which are perl modules, that each provide one or more preprocessor directives. 
+
+Since preprocessing happens before htmlization but after a page is loaded and linkified, it should be possible to use it to create something like a link map or lists, or a page index. Page inlining and rss generation is already done via preprocessor directives and seems a natureal as a plugin too. 
+
+Note that things like a link map or a broken link list page would need to be updated whenever a set (or all) pages change; the %inlinepages hash already allows for pages to register this, although it might need to be renamed.