Add haskell

init.el

 (require 'init-octave)
 (require 'init-solidity)
 (require 'init-rust)
+(require 'init-haskell)
 (require 'init-latex)
 (require 'init-mu4e)
 

lisp/init-haskell.el

+;;; package --- Haskell mode
+;;; Commentary:
+;;; Code:
+
+(require-package 'haskell-mode)
+
+;; https://emacsclub.github.io/html/haskell.html#sec-3
+(add-hook 'haskell-mode-hook 'turn-on-haskell-doc-mode)
+(add-hook 'haskell-mode-hook 'turn-on-haskell-indentation)
+
+;; https://gitlab.haskell.org/ghc/ghc/wikis/emacs
+;; Highlight text beyond 80th column
+(require 'whitespace)
+(defun haskell-custom-line-length ()
+  (setq whitespace-style '(face lines-tail))
+  (setq whitespace-line-column 80)
+  (global-whitespace-mode t))
+
+(add-hook 'haskell-mode-hook 'haskell-custom-line-length)
+
+;; Allows you to jump to the first error in compiled or interpreted code.
+(global-set-key (kbd "M-g M-f") 'first-error)
+
+(provide 'init-haskell)
+
+;;; init-haskell.el ends here