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-[[WhyIkiWiki]]?
+An overview of some of ikiwiki's features:
+[[!toc ]]

 
 

-Currently implemented:
+## Uses a real RCS

 
 

-* [[Subversion]]
+Rather than implement its own system for storing page histories etc,
+ikiwiki uses a real [[Revision_Control_System|rcs]]. This isn't (just)
+because we're lazy, it's because a real RCS is a good thing to have, and
+there are advantages to using one that are not possible with a standard
+wiki.

 
 

-  Rather than implement its own system for storing page histories etc,
-  ikiwiki simply uses subversion. (Supporting other revision control
-  systems is also possible, ikiwiki only needs $FOO add, $FOO commit, and
-  $FOO log).
+Instead of editing pages in a stupid web form, you can use vim and commit
+changes via [[Subversion|rcs/svn]], [[rcs/git]], or any of a number of other
+[[Revision_Control_Systems|rcs]].

 
 

-  Instead of editing pages in a stupid web form, you can use vim and commit
-  changes via svn. Or work disconnected using svk and push your changes out
-  when you come online.
+Ikiwiki can be run from a [[post-commit]] hook to update your wiki
+immediately whenever you commit a change using the RCS.

 
 

-  ikiwiki can be run from a [[post-commit]] hook to update your wiki
-  immediately whenever you commit.
+It's even possible to securely let
+[[anonymous_users_git_push_changes|tips/untrusted_git_push]]
+to the wiki.

 
 

-  Note that ikiwiki does not require subversion to function. If you want to
-  run a simple wiki without page history, it can do that too.
+Note that ikiwiki does not require a RCS to function. If you want to
+run a simple wiki without page history, it can do that too.

 
 

-* [[MarkDown]]
+## A wiki compiler

 
 

-  ikiwiki supports pages using [[MarkDown]] as their markup language. Any
-  page with a filename ending in ".mdwn" is converted from markdown to html
-  by ikiwiki. Markdown understands text formatted as it would be in an email,
-  and is quite smart about converting it to html. The only additional markup
-  provided by ikiwiki aside from regular markdown is the [[WikiLink]].
+Ikiwiki is a wiki compiler; it builds a static website for your wiki, and
+updates it as pages are edited. It is fast and smart about updating a wiki,
+it only builds pages that have changed (and tracks things like creation of
+new pages and links that can indirectly cause a page to need a rebuild)

 
 

-* support for other file types
+## Supports many markup languages

 
 

-  ikiwiki also supports files of any other type, including raw html, text,
-  images, etc. These are not converted to wiki pages, they are just copied
-  unchanged by ikiwiki as it builds your wiki. So you can check in an image,
-  program, or other special file and link to it from your wiki pages.
+By default, pages in the wiki are written using the [[ikiwiki/MarkDown]] format.
+Any page with a filename ending in ".mdwn" is converted from markdown to html
+by ikiwiki. Markdown understands text formatted as it would be in an email,
+and is quite smart about converting it to html. The only additional markup
+provided by ikiwiki on top of regular markdown is the [[ikiwiki/WikiLink]] and 
+the [[ikiwiki/directive]].

 
 

-* [[SubPage]]s
+If you prefer to use some other markup language, ikiwiki allows others to
+easily be added by [[plugins]]. For example it also supports traditional
+[[plugins/WikiText]] formatted pages, pages written as pure
+[[plugins/HTML]], or pages written in [[reStructuredText|plugins/rst]]
+or [[Textile|plugins/textile]].

 
 

-  Arbitrarily deep hierarchies of pages with fairly simple and useful [[SubPage/LinkingRUles]]
+Ikiwiki also supports files of any other type, including plain text,
+images, etc. These are not converted to wiki pages, they are just copied
+unchanged by ikiwiki as it builds your wiki. So you can check in an image,
+program, or other special file and link to it from your wiki pages.

 
 

-* Fast compiler
+## Blogging

 
 

-  ikiwiki is fast and smart about updating a wiki, it only builds pages that have changed (and tracks things like creation of new pages and links that can indirectly cause a page to need a rebuild)
+You can turn any page in the wiki into a [[blog]]. Pages matching a
+specified [[ikiwiki/PageSpec]] will be displayed as a weblog within the blog
+page. And RSS or Atom feeds can be generated to follow the blog.

 
 

-* [[Templates]]
+Ikiwiki's own [[TODO]], [[news]], and [[plugins]] pages are good examples
+of some of the flexible ways that this can be used. There is also an 
+[[example_blog|examples/blog]] set up that you can copy into your own wiki.

 
 

-  ikiwiki generates html using templates so you can change the look and 
-  layout of all pages in any way you would like.
+Ikiwiki can also [[plugins/aggregate]] external blogs, feeding them into
+the wiki. This can be used to create a Planet type site that aggregates
+interesting feeds.

 
 

-* [[BackLinks]]
+You can also mix blogging with podcasting by dropping audio files where
+they will be picked up like blog posts. This will work for any files that
+you would care to syndicate.

 
 

-  Automatically included on pages. Rather faster than eg [[MoinMoin]] and always there to help with navigation.
+## Valid html and [[css]]

 
 

-* [[PageHistory]]
+Ikiwiki aims to produce 
+[valid XHTML 1.0](http://validator.w3.org/check?url=referer). Ikiwiki
+generates html using [[templates|wikitemplates]], and uses [[css]], so you
+can change the look and layout of all pages in any way you would like.

 
 

-  Well, sorta. Rather than implementing YA history browser, it can link to
-  [[ViewCVS]] or the link to browse the history of a wiki page.
+## [[Plugins]]

 
 

-* [[RecentChanges]], editing pages in a web browser
+Plugins can be used to add additional features to ikiwiki. The interface is
+quite flexible, allowing plugins to implement additional markup languages,
+register [[directives|ikiwiki/directive]], provide a [[RCS]] backend, hook
+into [[CGI]] mode, and much more. Most of ikiwiki's features are actually
+provided by plugins.

 
 

-  Nearly the definition of a wiki, although perhaps ikiwiki challenges how
-  much of that web gunk a wiki really needs. These features are optional
-  and can be enabled by enabling [[CGI]].
+The standard language for ikiwiki plugins is perl, but ikiwiki also supports
+[[plugins/write/external]] plugins: Standalone programs that can be written in
+any language and communicate with ikiwiki using XML RPC.

 
 

-* User registration
+## [[todo/utf8]]

 
 

-  Can optionally be configured to allow only registered users to post
-  pages; online user registration form, etc.
+After rather a lot of fiddling, we think that ikiwiki correctly and fully
+supports utf8 everywhere.

 
 

-* Discussion pages
+## Other features

 
 

-  Thanks to subpages, every page can easily and automatically have a
-  /Discussion subpage. By default, these links are included in the
-  [[templates]] for each page.
+The above are the core design goals and features of ikiwiki, but on that
+foundation a lot of other important features are added. Here is an
+incomplete list of some of them.

 
 

-* Smart merging and conflict resolution in web browser
+### [[Tags]]

 
 

-  Since it uses subversion, ikiwiki takes advantage of its smart merging to avoid any conflicts when two people edit different parts of the same page    at the same time. No annoying warnings about other editors, or locking, etc, instead the other person's changes will be automaticaly merged with yours when you commit.
+You can tag pages and use these tags in various ways. Tags will show
+up in the ways you'd expect, like at the bottom of pages, in blogs, and
+in RSS and Atom feeds.

 
 

-  In the rare cases where automatic merging fails due to the same part of a page being concurrently edited, regular subversion commit markers are shown in the file to resolve the conflict, so if you're already familiar with that there's no new commit marker syntax to learn.
+### [[SubPages|ikiwiki/SubPage]]

 
 

-----
+Arbitrarily deep hierarchies of pages with fairly simple and useful
+[[ikiwiki/SubPage/LinkingRules]]

 
 

-It also has lots of [[TODO]] items and [[Bugs]]. This wiki is not ready for production!
+### [[BackLinks]]
+
+Automatically included on pages. Rather faster than eg MoinMoin and
+always there to help with navigation.
+
+### Smart merging and conflict resolution in your web browser
+
+Since it uses a real RCS, ikiwiki takes advantage of its smart merging to
+avoid any conflicts when two people edit different parts of the same page
+at the same time. No annoying warnings about other editors, or locking,
+etc, instead the other person's changes will be automatically merged with
+yours when you commit.
+
+In the rare cases where automatic merging fails due to the same part of a
+page being concurrently edited, regular commit conflict markers are
+shown in the file to resolve the conflict, so if you're already familiar
+with that there's no new commit marker syntax to learn.
+
+### [[RecentChanges]], editing pages in a web browser
+
+Nearly the definition of a wiki, although perhaps ikiwiki challenges how
+much of that web gunk a wiki really needs. These features are optional
+and can be enabled by enabling [[CGI]] and a [[Revision_Control_System|rcs]].
+
+### User registration
+
+Can optionally be configured to allow only registered users to edit
+pages.
+
+User registration can be done using a web form, or ikiwiki can be
+configured to accept users authenticated with OpenID, or HTTP basic
+authentication, or other methods implemented via plugins.
+
+### Discussion pages
+
+Thanks to subpages, every page can easily and automatically have a
+/Discussion subpage. By default, these links are included in the
+[[templates]] for each page. If you prefer blog-syle
+[[plugins/comments]], that is available too.
+
+### Edit controls
+
+Wiki admins can lock pages so that only other admins can edit them. Or a
+wiki can be set up to allow anyone to edit Discussion pages, but only
+registered users to edit other pages. These are just two possibilities,
+since page edit controls can be changed via plugins.
+
+### [[PageHistory]]
+
+Well, sorta. Rather than implementing YA history browser, it can link to
+[[ViewVC]] or the like to browse the history of a wiki page.
+
+### Full text search
+
+Ikiwiki can use the xapian search engine to add powerful
+full text [[plugins/search]] capabilities to your wiki.
+
+### Translation via po files
+
+The [[plugins/po]] plugin allows translating individual wiki pages using
+standard `po` files.
+
+### [[w3mmode]]
+
+Can be set up so that w3m can be used to browse a wiki and edit pages
+without using a web server.