"stack script" support or workarounds?

[ethercrow]

I have some scripts written using stack script interpreter, which conveniently takes care of installing packages my scripts depend on. Understandably, ghcide is not aware of this, but maybe I can do something to make it aware?

Is writing a hie.yaml something I need here? Didn't have to do that yet for other, non-script projects.

This is how it looks currently:

[cocreature]

Does stack script have a way to load the script into ghci? That should make it fairly easy to add support for this to hie-bios which we use to setup the GHC environment.

[hazelweakly]

@cocreature stack script does indeed support the ability to load something into ghci. Full details here

Relevant snippet:

A script (with program omitted):

#!/usr/bin/env stack
{- stack
  script
  --resolver lts-8.2
  --package turtle
-}

As far as i can tell, this is the equivalent to load it up into ghci:

#!/usr/bin/env stack
{- stack
     --resolver lts-8.2
     --install-ghc
     exec ghci
     --package turtle
-}

With stack script, the resolver should already be there (not that I think ghcide actually needs it?) And the ghcide already knows where ghc is or it wouldn't be running in the first place. So it seems like figuring out how to shove things into GHCi automatically shouldn't be too difficult? Famous last words, of course.

[andys8]

I was also looking into this. Another related problem is using ghcide with "standalone" haskell configuration files with xmonad or xmobar. It'll complain about missing packages, too. If stack scripts would work, it might be a workaround for this issue, too.

For now my "workaround" is to add package.yaml and stack.yaml with all dependencies to make ghcide happy.

[fendor]

Stack scripts work in a "hacky" way.
You have to add an explicit hie.yaml file with the contents:

cradle:
  stack:
    component: "File.hs" # your local stack script

Works fine for loading and modifying the stack script.
However, if you modify the script section, these changes wont be detected, e.g. you have to restart ghcide/hls.

The reason this works is that you can do stack repl File.hs and the session is loaded correctly.

[jneira]

related: haskell/hie-bios#217

[jneira]

closinf in favour of #111