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-For one type of plugin, see [[todo/PluggableRenderers]]. 
+Suggestions of ideas for plugins:
 
-A plugin system should ideally support things like:
+* list of registered users - tricky because it sorta calls for a way to rebuild the page when a new user is registered. Might be better as a cgi?
+* [[sigs]] ?
 
-* [[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.
-* etc
+* Support [[RecentChanges]] as a regular page containing a plugin that
+  updates each time there is a change, and statically builds the recent
+  changes list. (Would this be too expensive/inflexible? There might be
+  other ways to do it as a plugin, like making all links to RecentChanges
+  link to the cgi and have the cgi render it on demand.) 
 
-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. 
+  Or using an iframe
+  to inline the cgi, although firefox seems to render that nastily with
+  nested scroll bars. :-(
 
-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. 
+* It would be nice to be able to have a button to show "Differences" (or 
+  "Show Diff") when editing a page. Is that an option that can be enabled?
+  Using a plugin?
 
-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. 
+* For PlaceWiki I want to be able to do some custom plugins, including one
+  that links together subpages about the same place created by different
+  users. This seems to call for a plugin that applies to every page w/o any
+  specific marker being used, and pre-or-post-processes the full page
+  content. It also needs to update pages when related pages are added,
+  so it needs to register dependencies pre-emptively between pages,
+  or something. It's possible that this is a special case of backlinks and
+  is best implemented by making backlinks a plugin somehow. --[[Joey]]
 
-I need to look at the range of things that other wikis use their plugin systems for, but preprocessor directives as plugins certianly seems useful, even if it's  not a complete solution.
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+* interwiki links
+
+* random page (cgi plugin; how to link to it easily?)
+
+All the kinds of plugins that blogging software has is also a possibility:
+
+* How about an event calendar. Events could be sub-pages with an embedded 
+  code to detail recurrance and/or event date/time