/InterpolatePlugin

Interpolate plugin for GHC 8.10.7

Primary LanguageHaskell

Interpolate plugin for GHC

main :: IO ()
main = 
  let a = 5
      b = 6
  in putStrLn "#a + #b = #{ a + b }"

>>> 5 + 6 = 11

Plugin can interpolate values and Haskell expressions into strings (forall str. IsString str) with your custom toString function.

Pros and Why not iii

  • Interpolating with plugin looks like valid Haskell code
  • Your custom toString
  • Simple implementation

Cons and Why iii

  • Since it's a plugin, it must be defined outside of your project
  • To specify toString function you need to create your own plugin based on this one
  • String literals not supported inside of placeholders
  -- will be parsed by GHC as 3 strings separated by `foo` and `bar`
   "#{ if cond then "foo" else "bar" }"
  • HLS shows plugin's errors at the top of file