I've added a new feature to Distributed Documentor today, conditional blocks.

The idea is that parts of the documents can be enabled when a given condition is present. This is very similar to C's ifdef blocks. To use it with the MediaWiki syntax, put [When:X] and [End] commands in separate lines:

Unconditional

[When:FIRST]
First conditional

[When:SECOND]
First and second conditional
[End]
[End]

[When:SECOND]
Second conditional
[End]

Snippets can also have conditional blocks.

There are two possibilities to set which conditionals are enabled:

1. Specifying it with command line arguments, such as

    java -jar DistributedDocumentor.jar -D FIRST -D SECOND
   

   This is useful when exporting a documentation from command line, or to launch the documentation editor with a predefined set of enabled conditions.

2. On the user interface, using View menu's Enabled conditions... menu item: