feat(format): add :lang swift formatter

modules/lang/swift/config.el

@@ -27,6 +27,7 @@
   :after swift-mode
   :init (add-hook 'swift-mode-local-vars-hook #'lsp! 'append)
   :config
+  (set-formatter! 'swiftformat '("swiftformat" "--output" "stdout"))
   (setq lsp-sourcekit-executable
         (cl-find-if #'executable-find
                     (list lsp-sourcekit-executable ; 'sourcekit-lsp' by default

modules/lang/swift/doctor.el

@@ -3,3 +3,7 @@
 (assert! (or (not (modulep! +tree-sitter))
              (modulep! :tools tree-sitter))
          "This module requires (:tools tree-sitter)")
+
+(when (modulep! :editor format)
+  (unless (executable-find "swiftformat")
+    (warn! "Couldn't find swiftformat. Formatting will be disabled.")))