Date: Fri, 10 Sep 2010 13:48:42 +0000
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Since PhpWiki-1.3.3 support for ~WikiPlugins is included.

A plugin is some PHP code that

* lives in =phpwiki/lib/plugin/<pluginname>.php=
* implements the ~WikiPlugin interface by extending that class.

There are many plugins already distributed with PhpWiki. Simply look in the =lib/plugin=
directory or see the PluginManager list.

To write your own, look at the HelloWorldPlugin (~HelloWorld.php in that directory), 
which is a minimal example of a plugin.
Publish your self-written plugin at a new PhpWiki page with ~PluginName + *Plugin* appended 
and add a link to [CategoryContributedPlugin | PhpWiki:CategoryContributedPlugin].

A Help:WikiPlugin allows one to easily add new types of dynamic content 
(as well as other functionality) to wiki pages within PhpWiki.
In this very wiki all actions which are not entirely lowercased
are implemented using plugins, and some lowercased convenience actions also. (rename, revert, setacl, diff, ...)

(The old-style  Help:MagicPhpWikiURLs have been replaced by plugins entirely.)

== Example

Currently, one invokes a plugin by putting something like:

{{{
<<AllPages limit=5>>
}}}

into a regular wiki-page.  That particular example produces a list of
the first 5 existing pages (via the ~PageList library).

<<AllPages limit=5 >>

== Details

Plugins can take certain named arguments (most do).  The values of
these arguments can be determined four different ways.  In order of
precedence:

# The plugin invocation can specify the value for an argument, like so:
  {{{
  <<BackLinks page=OtherPage >>
  }}}

# The argument can be specified via an HTTP query argument.  This
  doesn't happen (is not allowed) unless the argument is mentioned in
  the plugin invocation:

  {{{
  <<BackLinks page >>
  }}}

# Default values specified in the plugin invocation:

  {{{
  <<BackLinks page||=OtherPage >>
  }}}

# The plugin must supply default values for each argument it uses.
  Such default args may be overriden by URL arguments like so: 
  {{{
    BackLinks?page=ThisPage&sortby=-mtime
  }}}
  (The BackLinks plugin uses the current page as the default value for
  the ''page'' argument.)

  Most plugins using the ~PageListLibrary inherit their default arguments 
  from the PhpWiki:PageListLibrary.

=== Standard Arguments

Most plugins display a list of pages, via the ~PageListLibrary.
~PageList provides automatic support for those arguments.

  info, exclude, author, owner, creator, sortby, limit, paging, cols, azhead,
  comma, commasep, ordered

  For details see the PhpWiki:PageListLibrary documentation.

*exclude* and *pages* accept a list of pages. Either as comma-seperated list,
supporting glob-style wildcards, or via the <tt><!plugin-list pluginname ~[args~] !></tt>
invocation syntax, where pluginname might be any plugin returning a pagelist.
See PhpWiki:PluginList.

=== Basic Plugin Types

All these plugins derive from the Help:WikiPlugin class extending the run method,
which returns a object tree of HTML objects, and may react on any
provided arguments from the ~WikiPage (see the args below) or
optionally overridden by arguments from the url (GET or POST args), 
if defined via '||='.

A basic plugin just needs the run() method, and optionally getName, 
getDescription, getDefaultArguments. See the Help:HelloWorldPlugin for a short introduction.

  *plugin* reacts on its arguments and the request and displays arbitrary HTML.

  *plugin-form* is used to display a input type=text box for the default argument *s*.

  *plugin-list* is used as argument to provide a dynamic list of pagenames.

  {{{
    <<PluginName  Help:s ...] >>
  }}}

  {{{
    <?plugin-form PluginName  Help:s ...] ?>
  }}}

  {{{
    <<PluginName args=<!plugin-list pluginname  Help:s ] !> >>
  }}}

==== The box Method

Themes based on the "sidebar" theme may use the box method of any plugin, which displays a *title* 
and a condensed *content* in a box.

==== ~WikiPluginCached

Plugins deriving from the class ~WikiPluginCached must also define the methods getPluginType(), 
optionally getExpire(), managesValidators(), and dependent of the getPluginType the methods 
to display the *possibly cached* result.

  getImage(), getMap() or getHtml(), 

optionally also

  getAlt(), getImageType(), embedMap(), embedImg(), embedObject()

See the config.ini PLUGIN_CACHED_* settings and PhpWiki:WikiPluginCached

=== Aktions Seiten

The term *~ActionPage* refers to a page containing a plugin invocation.
An *action* is together with the *pagename* argument the a basic PhpWiki argument. 
It can both be GET or POST actions. Actions are untranslated, always english. 
Basic (and old) actions are all lowercase, like edit, browse, remove, ...
Newer actions in PhpWiki:CamelCase are invoked via plugins on their specific action page.

We decoupled actions from plugins via action pages for the following reasons:

# support translated action buttons and customizable action descriptions. 
# customize standard actions by tuning the plugin invocation arguments. override or add plugin defaults.
# split simple plugins into multiple actions, like RecentChanges/RecentEdits, MostPopular/LeastPopular, 
  AllPages/AllPagesCreatedByMe/AllPagesLastEditedByMe/AllPagesOwnedByMe which differ only in one argument.

* Those actions which have buttons or links in the theme or are referenced in the standard pgsrc 
  pageset require their (possibly localized) actionpages, otherwise the actions will not work.
* If the localized actionpage is not found the english version is used.
* If no actionpage is found, it is recommended to do action=upgrade, which imports all missing 
  and required action pages into the database.

So for a hypothetical new ~MyActionPage plugin ~MyActionPage will invoke the plugin and 
~MyActionPagePlugin is the the description.

== Existing Plugins

See PluginManager for a detailed list. Most plugins should have their own description page with the name 
*Plugin* appended.

<<BackLinks noheader=1 >>

== Contributed Plugins 

See PhpWiki:CategoryContributedPlugin.

<<Backlinks page=CategoryContributedPlugin >>

-----
[[PhpWikiDokumentation]]
