[krapp]

Certainly, but personally I would still like to keep logic out of configuration as much as possible.

If I had to pick an actual language for configuration I would probably pick Javascript, mostly because I like JSON's syntax.

My instinct would be to say that if you need non-trivial logic, you may have an issue elsewhere with separation of concerns, and should move that code somewhere else.

But I will concede there may be a cases I'm just not aware of where that's unavoidable. Almost everything I do involves json or ini files anyway so I haven't really worked on anything incredibly complex.

[vidarh]

My first and biggest issue with computation in configuration files is the moment you need to / want to manage that configuration with a tool.

In 30+ years I've never come across a case where logic has been necessary in configuration beyond very simple branching / inclusion logic, if that.