New :editor format module

Centralized code formatting with built-in support for a variety of
languages. Provides the set-formatter! function for defining your own.

Still experimental and needs more testing!

modules/lang/go/config.el

@@ -12,15 +12,13 @@
     :references #'go-guru-referrers
     :documentation #'godoc-at-point)
 
+  (set-formatter! 'go-mode #'gofmt)
   (when-let* ((goimports (executable-find "goimports")))
     (setq gofmt-command goimports))
-
   (when (featurep! :feature syntax-checker)
     (setq gofmt-show-errors nil)) ; Leave it to flycheck
 
   (add-hook 'go-mode-hook #'go-eldoc-setup)
-  (add-hook! go-mode
-    (add-hook 'before-save-hook #'gofmt-before-save nil t))
 
   (def-menu! +go/refactor-menu
     "Refactoring commands for `go-mode' buffers."

modules/lang/php/config.el

@@ -9,6 +9,7 @@
 
   (set-repl-handler! 'php-mode #'php-boris)
   (set-lookup-handlers! 'php-mode :documentation #'php-search-documentation)
+  (set-formatter! 'php-mode #'php-cs-fixer-fix)
 
   ;; `+php-company-backend' uses `company-phpactor', `php-extras-company' or
   ;; `company-dabbrev-code', in that order.

modules/lang/sh/config.el

@@ -67,6 +67,4 @@
 (def-package! fish-mode
   :when (featurep! +fish)
   :defer t
-  :config
-  (add-hook! fish-mode
-    (add-hook 'before-save-hook #'fish_indent-before-save)))
+  :config (set-formatter! 'fish-mode #'fish_indent))