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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. This isn't 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]]. Or work disconnected using svk and push your
+changes out when you come online. Or use [[git]], [[tla]], or [[mercurial]]
+to work in a distributed fashion all the time. (It's also possible to
+[[plugins/write]] a plugin to support other systems.)

 
 

-  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.
+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.

 
 

-  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.
+## A wiki compiler

 
 

-* [[MarkDown]]
+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)

 
 

-  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]].
+## Supports many markup languages

 
 

-* support for other file types
+By default, pages in the wiki are written using the [[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 [[WikiLink]] and 
+[[PreprocessorDirective]].

 
 

-  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.
+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]].

 
 

-* [[SubPage]]s
+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.

 
 

-  Arbitrarily deep hierarchies of pages with fairly simple and useful [[SubPage/LinkingRUles]]
+## [[Blogging|blog]]

 
 

-* [[blog]]s
+You can turn any page in the wiki into a [[blog]]. Pages matching a
+specified [[PageSpec]] will be displayed as a weblog within the blog
+page. And RSS or Atom feeds can be generated to follow the blog.

 
 

-  You can turn any page in the wiki into a [[blog]]. Pages with names 
-  matching a specified [[GlobList]] will be displayed as a weblog within
-  the blog page. And an RSS feed can be generated to follow the blog.
+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.

 
 

-  Ikiwikit's own [[TODO]] and [[news]] pages are good examples of some of the flexible ways that this can be used.
+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.

 
 

-* Fast compiler
+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.

 
 

-  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)
+## Valid html and [[css]]

 
 

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

 
 

-  ikiwiki generates html using templates so you can change the look and 
-  layout of all pages in any way you would like.
+## [[Plugins]]

 
 

-* [[BackLinks]]
+Plugins can be used to add additional features to ikiwiki. The interface
+is quite flexible, allowing plugins to implement additional markup
+languages, register [[PreProcessorDirective]]s, hook into [[CGI]] mode,
+and more. Most of ikiwiki's features are actually provided by plugins.
+Ikiwiki's backend RCS support is also pluggable, so support for new
+revision control systems can be added to ikiwiki.

 
 

-  Automatically included on pages. Rather faster than eg [[MoinMoin]] and always there to help with navigation.
+## [[todo/utf8]]

 
 

-* [[PageHistory]]
+After rather a lot of fiddling, we think that ikiwiki correctly and fully
+supports utf8 everywhere.

 
 

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

 
 

-* [[RecentChanges]], editing pages in a web browser
+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.

 
 

-  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]].
+### [[Tags]]

 
 

-* User registration
+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.

 
 

-  Can optionally be configured to allow only registered users to post
-  pages; online user registration form, etc.
+### [[SubPages|SubPage]]

 
 

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

 
 

-  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.
+### [[BackLinks]]

 
 

-* Smart merging and conflict resolution in your web browser
+Automatically included on pages. Rather faster than eg MoinMoin and
+always there to help with navigation.

 
 

-  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.
+### Smart merging and conflict resolution in your web browser

 
 

-  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.
+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.

 
 

-* page locking
+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.

 
 

-  Wiki admins can lock pages so that only other admins can edit them.
+### [[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]].

 
 

-It also has some [[TODO]] items and [[Bugs]].
+### User registration
+
+Can optionally be configured to allow only registered users to post
+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.
+
+### Page locking
+
+Wiki admins can [[lock_pages|page_locking]] so that only other admins
+can edit them.
+
+### [[PageHistory]]
+
+Well, sorta. Rather than implementing YA history browser, it can link to
+[[ViewCVS]] or the like to browse the history of a wiki page.
+
+### Full text search
+
+ikiwiki can use the [[HyperEstraier]] search engine to add powerful
+full text search capabilities to your wiki.
+
+### Commit mails
+
+ikiwiki can be configured to send you commit mails with diffs of changes
+to selected pages.
+
+### [[w3mmode]]
+
+Can be set up so that w3m can be used to browse a wiki and edit pages
+without using a web server.