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Since v1.6.3 you can now define your own plugins.  These are just
simply Java classes that implement the
''org.apache.wiki.plugin.WikiPlugin'' interface and can be found from
somewhere in your class path.  The plugins work so that when you write
a special code on the Wiki page, the plugins are invoked and their
output is inserted into the page, verbatim.

The form is:

  [[{INSERT <plugin class> WHERE <param1=value1>,<param2=value2>,...}]

You can also use a shortcut: instead of using {{[[{INSERT org.apache.wiki.plugin.RecentChangesPlugin}} you can also use {{[[{INSERT RecentChangesPlugin}]}}.  This works only with the plugins that come with JSPWiki, though.

In addition, you can now (since 1.9.30) omit even the "INSERT", so the shortest possible version for plugins becomes:

[[{CurrentTimePlugin}]

If a parameter contains spaces, you can use single quotes (') around the parameter.  Like this:

[[{INSERT CurrentTimePlugin format='dd MM yyyy'}]

Here are some sample plugins included in the archive:

----

!!RecentChangesPlugin

Inserts the latest changes in order. 

!Parameters: 
* __since__=''n'' : show changes from the last n days.
* __format__=''(full|compact)'' : if "full", then display a long
  version with all possible info.  If "compact", then be as compact as possible.

!Example:
{{{
[{INSERT RecentChangesPlugin since=5, format=compact}]
}}}

Inserts the changes from the past 5 days in a compact format.  You
might use this to make an automatical list of changes to the [LeftMenu], or [LeftMenuFooter], for example.

----
  
!!UnusedPagesPlugin

Lists all pages that are not currently referred to by any other page, thus meaning they are inaccessible through any other means.

!Parameters

* __maxwidth__=''n'' : Limits the length of the generated links to at most ''n'' characters.  This should used to keep the [LeftMenu] or [LeftMenuFooter] at a manageable width.  Default is to not limit the length at all.


!Example:

See [UnusedPages].

----

!!UndefinedPagesPlugin

Lists all pages that are referred to, but not yet created.

!Parameters

* __maxwidth__=''n'' : Limits the length of the generated links to at most ''n'' characters.  This should used to keep the [LeftMenu] or [LeftMenuFooter] at a manageable width.  Default is to not limit the length at all.

!Example:

See [UndefinedPages].

----


!!ReferringPagesPlugin

Finds and lists all pages that refer to the current page.

!Parameters 

* __max__=''n'' : How many pages to list.  Default is 10. Some pages might create very long lists, so it's a good idea to limit the list size.
* __maxwidth__=''n'' : Limits the length of the generated links to at most ''n'' characters.  This should used to keep the [LeftMenu] or [LeftMenuFooter] at a manageable width.  Default is to not limit the length at all.

!Example

See [LeftMenuFooter].

----

!!CurrentTimePlugin

Just displays the current server time.

!Parameters

* __format__=''format string'' : How the date and time should be formatted.  If you omit this, a default format will be used. The following characters are available to you:

{{{
 Symbol   Meaning                 Presentation        Example
 ------   -------                 ------------        -------
 G        era designator          (Text)              AD
 y        year                    (Number)            1996
 M        month in year           (Text & Number)     July & 07
 d        day in month            (Number)            10
 h        hour in am/pm (1~12)    (Number)            12
 H        hour in day (0~23)      (Number)            0
 m        minute in hour          (Number)            30
 s        second in minute        (Number)            55
 S        millisecond             (Number)            978
 E        day in week             (Text)              Tuesday
 D        day in year             (Number)            189
 F        day of week in month    (Number)            2 (2nd Wed in July)
 w        week in year            (Number)            27
 W        week in month           (Number)            2
 a        am/pm marker            (Text)              PM
 k        hour in day (1~24)      (Number)            24
 K        hour in am/pm (0~11)    (Number)            0
 z        time zone               (Text)              Pacific Standard Time
 \'       escape for text         (Delimiter)
 \''      single quote            (Literal)           '
}}}

For example, two 'y':s give you the year using two digits.  Four 'y':s give you the year in four digits.  Three 'M':s give you the month in letters, whereas two 'M':s give just the month number.

(Yes, these are exactly the Java [SimpleDateFormat|http://java.sun.com/j2se/1.3/docs/api/java/text/SimpleDateFormat.html] arguments.  Sorry for copying them in.)

!Example

Using [[{INSERT CurrentTimePlugin format='yyyy.MM.dd G \'at\' hh:mm:ss z'}] would give you:

[{INSERT CurrentTimePlugin format='yyyy.MM.dd G \'at\' hh:mm:ss z'}]

----

!!IndexPlugin

Displays all of the pages in this Wiki in alphabetical order.  IndexPlugin has been contributed by AlainRavet.

!Parameters
* __itemsPerLine__ = ''n''.  Break every 'n' items on line.

!Example

See [PageIndex].

----

!!Counter

A simple counter that starts counting at 1 at the top of the page, and each time it is invoked, will increase its value by one.   These counters are transient, and relative to the current page view only - i.e. two persons viewing the same page at the same time get their own counters.

The current counter value is accessible also as a [WikiVariable].  The name of the variable is "counter", or "counter-<name>", if you have defined a counter name.

!Parameters

* __name__ = ''counter name''.  You may define as many counters per page as you want; you just need to separate them with the ''counter name''

!Example

[[{Counter}], [[{Counter}], [[{Counter}], [[{Counter name='aa'}] produces

[{Counter}], [{Counter}], [{Counter}], [{Counter name='aa'}].

The value of "counter" at the end is [{$counter}] and the value of "counter-aa" is [{$counter-aa}].