doomemacs/modules/lang/haskell

:lang haskell

• Table of Contents
• Install
  • Intero
    • Haskell
      • MacOS
      • Arch Linux
    • External dependencies
  • Dante
    • Haskell
      • MacOS
      • Arch Linux
    • External dependencies
• Troubleshooting
• Resources

This module adds Haskell support, powered by either intero (the default) or dante.

• Code completion (company-ghc)
• Look up documentation (hoogle)
• eldoc support (dante)
• REPL (ghci)
• Syntax-checking (flycheck)
• Code navigation (dante)
• Snippets

Haskell contends with C and Ruby as my favorite language. My Haskell code will never save the world, but I'll reach for it for small projects and programming exercises (like projecteuler.com or exercism.io).

I'd love to incorporate it into my machine learning work, but Python and Julia hold that crown. For now.

Table of Contents   TOC

• Install

  • Intero
  • Dante
• Troubleshooting
• Resources

Install

This module has two submodules: Intero or Dante. To activate one, specify one or the other in your pubilc init.el, e.g.:

(doom! :lang (haskell +intero))
;; or
(doom! :lang (haskell +dante))

Your dependencies will change slightly, depending on which you choose:

Intero

Haskell

To get started you must install stack:

MacOS

brew install haskell-stack
stack setup

Arch Linux

sudo pacman --needed --noconfirm -S stack
# Replace pacaur with your AUR package manager of choice
pacaur --needed --noconfirm -S ncurses5-compat-lib
stack setup

External dependencies

This module requires ghc-mod.

stack install ghc-mod

Also ensure that \~/.local/bin is in PATH:

# place this in your profile file, like ~/.bash_profile or ~/.zshenv
export PATH="~/.local/bin:$PATH"

Dante

Haskell

To get started with Dante and Haskell, you must install cabal

• cabal (the haskell package builder)
• ghc/ghci (the compiler, syntax checker & repl)

MacOS

brew install cabal-install ghc

Arch Linux

sudo pacman --needed --noconfirm -S cabal-install ghc

External dependencies

Dante requires ghc-mod and hoogle:

cabal update
cabal install happy haskell-src-exts   # ghc-mod/hoogle dependencies
cabal ghc-mod hoogle

And add Cabal's bin path to $PATH:

export PATH="$HOME/.cabal/bin:$PATH"

Troubleshooting

• Stack users: a dist/setup-config in your project may cause ghc-mod to not work.

Resources

Here are a few resources I've found indespensible in my Haskell adventures:

• Learn you a haskell for great good
• Haskell Programming from first principles
• Awesome Haskell: an extensive list of haskell resources
• The Haskell Tool Stack docs