haskell-mod.nvim

Scaffolds empty .hs buffers.

If the file lives under a package's hs-source-dirs, it is prefixed with its module header:

module Foo.Bar.FileName where

Otherwise, if the file looks like a standalone script, a runnable stack script header is generated instead:

#!/usr/bin/env stack
{- stack script
   --resolver lts
   --package aeson
   --package async
   --package bytestring
   --package containers
   --package directory
   --package filepath
   --package mtl
   --package process
   --package text
   --package time
   --package turtle
   --package unordered-containers
   --package vector
-}
{-# LANGUAGE OverloadedStrings #-}

main :: IO ()
main = do
    pure ()

A file counts as a standalone script when all of the following hold:

• No *.cabal, stack.yaml, package.yaml, or cabal.project exists anywhere above it (the search stops at the git root).
• Its filename does not start with an uppercase letter, so it cannot name a Haskell module.
• It declares no module ... where.

Nothing is ever written to a buffer that already has content.

--resolver lts floats to the newest LTS snapshot. Note that stack script materializes every listed package on first run, so the first execution of a generated script is slow — trim the --package block to taste.

Installation

This guide uses lazy.nvim.

{
    "mincomk/haskell-mod.nvim",
    config = true,
}