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+;;; haskell.el --- My Haskell preferences -*- lexical-binding: t -*-
+;; Author: William Carroll <wpcarro@gmail.com>
+
+;;; Commentary:
+;; Hosts my Haskell development preferences
+
+;;; Code:
+
+;; Haskell support
+
+;; font-locking, glyph support, etc
+(use-package haskell-mode
+  :config
+  (let ((m-symbols
+         '(("`mappend`" . "⊕")
+           ("<>"        . "⊕"))))
+    (dolist (item m-symbols) (add-to-list 'haskell-font-lock-symbols-alist item)))
+  (setq haskell-font-lock-symbols t)
+  (add-hook-before-save 'haskell-mode #'haskell-align-imports))
+
+;; LSP support
+(use-package lsp-haskell
+  :after (haskell-mode)
+  :config
+  (setq lsp-haskell-process-path-hie "hie-wrapper")
+  (add-hook 'haskell-mode-hook #'lsp-haskell-enable)
+  (add-hook 'haskell-mode-hook #'flycheck-mode))
+
+;; Test toggling
+(defun haskell/module->test ()
+  "Jump from a module to a test."
+  (let ((filename (->> buffer-file-name
+                       (s-replace "/src/" "/test/")
+                       (s-replace ".hs" "Test.hs")
+                       find-file)))
+    (make-directory (f-dirname filename) t)
+    (find-file filename)))
+
+(defun haskell/test->module ()
+  "Jump from a test to a module."
+  (let ((filename (->> buffer-file-name
+                       (s-replace "/test/" "/src/")
+                       (s-replace "Test.hs" ".hs")
+                       )))
+    (make-directory (f-dirname filename) t)
+    (find-file filename)))
+
+(defun haskell/test<->module ()
+  "Toggle between test and module in Haskell."
+  (interactive)
+  (if (s-contains? "/src/" buffer-file-name)
+      (haskell/module->test)
+    (haskell/test->module)))
+
+(provide 'wpc-haskell)
+;;; wpc-haskell.el ends here