[OS X TeX] ifthenelse in or for engines

[Friedrich Vosberg]

Morning.

I want to use different engines depending on the name of the file.  
For example:

IF filename CONTAINS *-copy.*
   USE %!TEX TS-program = copy.engine
ELSEIF filename CONTAINS *-draft.*
   USE %!TEX TS-program = draft.engine
ELSE
   USE %!TEX TS-program = final.engine

Must I define this switch in the engine file or in the tex file?

TIA and kind regards, Friedrich

--
In a world without walls and fences, who needs gates and windows?




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