I just found this on StackOverflow:
http://stackoverflow.com/a/648487/208880
tl;dr
-----
> Recently I was working upon a project and I realised that I wanted to
> have conditionals inside my configuration file [...]
>
> I didn't want to write a mini-language, because unless I did it very
> carefully I couldn't allow the flexibility that would be useful.
>
> Instead I decided that I'd have two forms: If the file started with
> "#!" and was executable I'd parse the result of running it; otherwise
> I'd read it as-is
That approach seems like a win-win: the plain-vanilla static file can be
promoted as best-practice, yet we have a fall-back for the complicated
and edge cases.
--
~Ethan~
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