feat(format): add :lang nim formatter

modules/lang/nim/config.el

@@ -12,6 +12,8 @@ nimsuggest isn't installed."
       (when (and nimsuggest-path (file-executable-p nimsuggest-path))
         (nimsuggest-mode))))
 
+  (set-formatter! 'nmfmt '("nimfmt" filepath) :modes '(nim-mode))
+
   (when IS-WINDOWS
     ;; TODO File PR/report upstream (https://github.com/nim-lang/nim-mode)
     (defadvice! +nim--suggest-get-temp-file-name-a (path)

modules/lang/nim/doctor.el

@@ -1,4 +1,4 @@
-;; -*- lexical-binding: t; no-byte-compile: t; -*-
+
 ;;; lang/nim/doctor.el
 
 (unless (executable-find "nimsuggest")
@@ -7,3 +7,6 @@
 (unless (executable-find "nim")
   (warn! "Could not find nim executable; build commands will be disabled."))
 
+(when (modulep! :editor format)
+  (unless (executable-find "nimfmt")
+    (warn! "Could not find nimfmt. Formatting will be disabled.")))