ENH use better formatter for haskell

etc/conf.org

@@ -773,9 +773,13 @@ Most languages have a plugin/command to make their code "look pretty" (usually o
 
 #+begin_src emacs-lisp
 (use-package format-all
-  :straight t)
+  :straight t
+  :hook ((format-all-mode . format-all-ensure-formatter))
+  :config
+  (setcdr (assoc "Haskell" format-all-default-formatters) '(fourmolu)))
 
 (delight 'format-all-mode "α" "format-all")
+
 #+end_src
 ** parenthesis matching
 This color-codes matching parenthesis. Enable pretty much everywhere.
@@ -1076,7 +1080,6 @@ I have also found this to be much simpler and conflicting with other packages su
                 ;; local completions in 'where' and 'let' clauses
                 '((company-capf company-dabbrev-code))))
 
-
   (use-package haskell-mode
     :straight t
     :hook ((haskell-mode . origami-mode)
@@ -1088,14 +1091,16 @@ I have also found this to be much simpler and conflicting with other packages su
            (haskell-mode . interactive-haskell-mode)
            (haskell-mode . nd/init-haskell-company)
            ;; camelcase is defacto for haskell
-           (haskell-mode . subword-mode))
+           (haskell-mode . subword-mode)
+           ;; don't use haskell-mode's builtin stylish plugin for formatting
+           (haskell-mode . format-all-mode))
     :config
     (setq haskell-interactive-popup-errors nil
           ;; we use stack...which counterintuitively means we set the
           ;; cabal build command to be stack
           haskell-compile-cabal-build-command "stack build"
-          ;; use stylish (requires the stylish binary somewhere in $PATH)
-          haskell-stylish-on-save t
+          ;; don't use stylish
+          haskell-stylish-on-save nil
           ;; use some handy suggestions
           haskell-process-suggest-remove-import-lines t
           haskell-process-auto-import-loaded-modules t
@@ -1136,7 +1141,7 @@ Dhall is a functional/typed configuration language (bout time).
   :straight t
   :mode "\\.dhall\\'"
   :config
-  (setq dhall-type-check-inactivity-timeout 5))
+  (setq dhall-type-check-inactivity-timeout 1))
 
 (defun nd/dhall-toggle-type-check ()
   "Turn dhall type checking on/off."