Purescript mode improvements (#4683)

* Purescript mode improvements

- Add keybindings
- Enable flycheck
- Add psci based repl

Signed-off-by: Rudi Grinberg <me@rgrinberg.com>

* address review

Signed-off-by: Rudi Grinberg <me@rgrinberg.com>

* address review

Signed-off-by: Rudi Grinberg <me@rgrinberg.com>

modules/lang/purescript/config.el

@@ -7,19 +7,32 @@
   (add-hook! 'purescript-mode-hook
              #'purescript-indentation-mode
              #'rainbow-delimiters-mode)
+
+  (map! :localleader
+        :map purescript-mode-map
+        "t" #'psc-ide-show-type
+        "c" #'psc-ide-case-split
+        "i" #'psc-ide-add-import
+        "a" #'psc-ide-add-clause
+        "f" #'psc-ide-flycheck-insert-suggestion
+        (:prefix ("l" . "load")
+         "m" #'psc-ide-load-module
+         "a" #'psc-ide-load-all)
+        (:prefix ("s" . "server")
+         "s" #'psc-ide-server-start
+         "S" #'psc-ide-server-quit))
+
+  (set-repl-handler! 'purescript-mode #'psci)
+
   (set-lookup-handlers! 'purescript-mode
     :definition #'psc-ide-goto-definition
     :documentation #'purescript-pursuit))
 
 
-;; (use-package! flycheck-purescript
-;;   :after purescript-mode
-;;   :config
-;;   (add-hook 'flycheck-mode-hook #'flycheck-purescript-setup))
-
-
 (use-package! psc-ide
   :hook (purescript-mode . psc-ide-mode)
   :config
   (remove-hook 'company-backends 'company-psc-ide-backend)
+  (when (featurep! :checkers syntax)
+    (psc-ide-flycheck-setup))
   (set-company-backend! 'purescript-mode 'company-psc-ide-backend))