Define custom command for a cabal repl session

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I was thinking that maybe you could make a custom Prelude that loads those modules automatically, but custom preludes also seem to break cabal repl according to my limited testing.

Edit: thanks to this stackoverflow post:

I figured out that you can make the custom prelude work if you put it into a different sublibrary. That also fixes the .ghci module loading problem. So you can do something like this:

-- .ghci
import YourModule

-- your-package.cabal
[...]

library demo
  build-depends: your-package

$ cabal repl demo

You can even give your script a different name if you put this in your .cabal file:

library demo
  build-depends: your-package
  ghc-options:   -ghci-script demo-script
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