Optional parameters with limited values

[GoogleCodeExporter]

Is there a way of configuring a tool with an optional paramter, where that 
paramter has a contrained set of options, none of which is equivalent to 
omitting the parameter. I've not been able to configure anything like this yet. 
(NB: I don't have any current examples where its neccessray, but velvetg 
-read_trkg is one example of yes/no/omitted)

Perhaps if a null value (in the json options) is set the parameter could be 
omitted? 

Thanks.

Original issue reported on code.google.com by s.willi...@qfab.org on 26 Aug 2011 at 5:19

[GoogleCodeExporter]

Original comment by amacgregor on 2 Mar 2012 at 8:57

[GoogleCodeExporter]

Original comment by aahun...@gmail.com on 7 Jul 2012 at 3:32

• Added labels: Type-Enhancement, Priority-Low, Component-Admin