Using Emacs with Haskell Projects

About

A tutorial about using Emacs to develop Haskell projects. Only basic Haskell and Emacs knowledge is required.

The tutorial attempts to cover several of the Emacs packages that one often uses when writing Haskell:

• company
• flycheck
• haskell-mode
• haskell-snippets
• helm
• hlint-refactor
• intero
• projectile
• use-package
• which-key
• yasnippet

If you are new to Emacs, go through its tutorial first (press control+h followed by t).

This was originally presented for the “PDX Emacs Hackers” group. Some of the people attending were not Haskellers, hence the sparse section on basic Haskell.

Setup

Haskell Tools

1. Install Stack
2. Install sandboxed GHC and dependencies

   stack setup
   stack build --dependencies-only --test
       

3. Install tools

   stack build intero
   stack install apply-refact codex hasktags hlint
   codex set format emacs
       

   This might take a while.

Emacs

1. Move any preexisting Emacs configurations

   for f in ~/.emacs*; do
     if [ -e "$f" ]; then
       echo "Moving config to $f.orig"
       mv "$f" "$f.orig"
     fi
   done
       

2. Use this project’s configuration

   cp -r emacs.d ~/.emacs.d
       

3. (Re)start Emacs

   It will take up to a couple of minutes for Emacs to download and compile all dependencies.

4. Follow the tutorial