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Implemented: PLUGINVERSION Variable

The %PLUGINVERSION{}% variable returns the $TWiki::Plugins::VERSION number if no parameter is specified, or the version number of a named Plugin. If the Plugin cannot be found or is not active, 0 is returned.

The %PLUGINVERSION{"AnyPluginName"}% can be used for conditional rendering based on a Plugin version. This can be done for example with the $IF() function of the SpreadSheetPlugin.


You type Sample output Renders as
%PLUGINVERSION{}% 1.025 6.00
%PLUGINVERSION{"EmptyPlugin"}% 0 0
%PLUGINVERSION{"DefaultPlugin"}% 1.021 0
%PLUGINVERSION{"SpreadSheetPlugin"}% 1.013 $Rev: 28085 (2014-09-23) $
%PLUGINVERSION{"TablePlugin"}% 1.013 $Rev: 26425 (2013-10-14) $

-- PeterThoeny - 14 Aug 2004
-- MartinCleaver - 09 Aug 2004


Would be useful for $TWiki::Plugins::VERSION to be visible through the wiki - TWikiReleaseTrackerPlugin has to otherwise get the user to specify manually.

-- MartinCleaver - 09 Aug 2004

Useful, yes, and simple to do.

What is a good variable name? I do not want to pollute the TWiki variable namespace too much. How about a generic TWiki system variable that eventually understands several options? That is also better for performance since the system variable needs to be evaluated just once. Examples:

  • %TWIKISYSTEM{"$pluginsversion"}% -- returns version number of $TWiki::Plugins::VERSION
  • %TWIKISYSTEM{"$twikiversion"}% -- returns what %WIKIVERSION% contains; the latter being retired as an deprecated and undocumented variable
  • %TWIKISYSTEM{"$serveros"}% -- returns the server OS
  • %TWIKISYSTEM{"TWiki version $twikiversion: Plugins API versions: $pluginsversion"}% -- can be combined


-- PeterThoeny - 10 Aug 2004

Hmm, on the other hand, once we have ContentAccessSyntax in place, %TWIKISYSTEM{}% is kind of obsolete. So just for this need here, should we add a %PLUGINVERSION%, which returns $TWiki::Plugins::VERSION?

-- PeterThoeny - 11 Aug 2004

This discussion started in TWikiDistributionVariable.

I changed the syntax to %PLUGINVERSION{}% and added support to query the version of installed Plugins.

Feature is implemented; in SVN; and documented in TWikiVariables.

-- PeterThoeny - 14 Aug 2004

Topic revision: r1 - 2004-08-14 - PeterThoeny
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