+(use-package flycheck-haskell)
+#+end_src
+
+*** [[https://github.com/ndmitchell/hlint/blob/20e116a043f2073c57b17b24ae6364b5e433ba7e/data/hs-lint.el][hs-lint.el]]
+:PROPERTIES:
+:header-args+: :tangle lisp/hs-lint.el :mkdirp yes
+:END:
+
+Currently using =flycheck-haskell= with the =haskell-hlint= checker
+instead.
+
+#+begin_src emacs-lisp :tangle no
+;;; hs-lint.el --- minor mode for HLint code checking
+
+;; Copyright 2009 (C) Alex Ott
+;;
+;; Author: Alex Ott <alexott@gmail.com>
+;; Keywords: haskell, lint, HLint
+;; Requirements:
+;; Status: distributed under terms of GPL2 or above
+
+;; Typical message from HLint looks like:
+;;
+;; /Users/ott/projects/lang-exp/haskell/test.hs:52:1: Eta reduce
+;; Found:
+;; count1 p l = length (filter p l)
+;; Why not:
+;; count1 p = length . filter p
+
+
+(require 'compile)
+
+(defgroup hs-lint nil
+ "Run HLint as inferior of Emacs, parse error messages."
+ :group 'tools
+ :group 'haskell)
+
+(defcustom hs-lint-command "hlint"
+ "The default hs-lint command for \\[hlint]."
+ :type 'string
+ :group 'hs-lint)
+
+(defcustom hs-lint-save-files t
+ "Save modified files when run HLint or no (ask user)"
+ :type 'boolean
+ :group 'hs-lint)
+
+(defcustom hs-lint-replace-with-suggestions nil
+ "Replace user's code with suggested replacements"
+ :type 'boolean
+ :group 'hs-lint)
+
+(defcustom hs-lint-replace-without-ask nil
+ "Replace user's code with suggested replacements automatically"
+ :type 'boolean
+ :group 'hs-lint)
+
+(defun hs-lint-process-setup ()
+ "Setup compilation variables and buffer for `hlint'."
+ (run-hooks 'hs-lint-setup-hook))
+
+;; regex for replace suggestions
+;;
+;; ^\(.*?\):\([0-9]+\):\([0-9]+\): .*
+;; Found:
+;; \s +\(.*\)
+;; Why not:
+;; \s +\(.*\)
+
+(defvar hs-lint-regex
+ "^\\(.*?\\):\\([0-9]+\\):\\([0-9]+\\): .*[\n\C-m]Found:[\n\C-m]\\s +\\(.*\\)[\n\C-m]Why not:[\n\C-m]\\s +\\(.*\\)[\n\C-m]"
+ "Regex for HLint messages")
+
+(defun make-short-string (str maxlen)
+ (if (< (length str) maxlen)
+ str
+ (concat (substring str 0 (- maxlen 3)) "...")))
+
+(defun hs-lint-replace-suggestions ()
+ "Perform actual replacement of suggestions"
+ (goto-char (point-min))
+ (while (re-search-forward hs-lint-regex nil t)
+ (let* ((fname (match-string 1))
+ (fline (string-to-number (match-string 2)))
+ (old-code (match-string 4))
+ (new-code (match-string 5))
+ (msg (concat "Replace '" (make-short-string old-code 30)
+ "' with '" (make-short-string new-code 30) "'"))
+ (bline 0)
+ (eline 0)
+ (spos 0)
+ (new-old-code ""))
+ (save-excursion
+ (switch-to-buffer (get-file-buffer fname))
+ (goto-char (point-min))
+ (forward-line (1- fline))
+ (beginning-of-line)
+ (setf bline (point))
+ (when (or hs-lint-replace-without-ask
+ (yes-or-no-p msg))
+ (end-of-line)
+ (setf eline (point))
+ (beginning-of-line)
+ (setf old-code (regexp-quote old-code))
+ (while (string-match "\\\\ " old-code spos)
+ (setf new-old-code (concat new-old-code
+ (substring old-code spos (match-beginning 0))
+ "\\ *"))
+ (setf spos (match-end 0)))
+ (setf new-old-code (concat new-old-code (substring old-code spos)))
+ (remove-text-properties bline eline '(composition nil))
+ (when (re-search-forward new-old-code eline t)
+ (replace-match new-code nil t)))))))
+
+(defun hs-lint-finish-hook (buf msg)
+ "Function, that is executed at the end of HLint execution"
+ (if hs-lint-replace-with-suggestions
+ (hs-lint-replace-suggestions)
+ (next-error 1 t)))
+
+(define-compilation-mode hs-lint-mode "HLint"
+ "Mode for check Haskell source code."
+ (set (make-local-variable 'compilation-process-setup-function)
+ 'hs-lint-process-setup)
+ (set (make-local-variable 'compilation-disable-input) t)
+ (set (make-local-variable 'compilation-scroll-output) nil)
+ (set (make-local-variable 'compilation-finish-functions)
+ (list 'hs-lint-finish-hook))
+ )
+
+(defun hs-lint ()
+ "Run HLint for current buffer with haskell source"
+ (interactive)
+ (save-some-buffers hs-lint-save-files)
+ (compilation-start (concat hs-lint-command " \"" buffer-file-name "\"")
+ 'hs-lint-mode))
+
+(provide 'hs-lint)
+;;; hs-lint.el ends here
+#+end_src
+
+#+begin_src emacs-lisp :tangle no
+(use-package hs-lint
+ :load-path "lisp/"
+ :bind (:map haskell-mode-map
+ ("C-c l l" . hs-lint)))
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