Fix emacs config.

nix/configuration/roles/emacs/files/emacs/elisp/lang-lua.el

@@ -0,0 +1,21 @@
+(defun lua-format-buffer ()
+  "Run stylua."
+  (interactive)
+  (run-command-on-buffer "stylua" "--search-parent-directories" "--stdin-filepath" buffer-file-name "-")
+  )
+
+(use-package lua-mode
+  :mode
+  (("\\.lua\\'" . lua-mode)
+   ("\\.rockspec\\'" . lua-mode))
+  :commands lua-mode
+  :hook (
+         (lua-mode . (lambda ()
+                        (add-hook 'before-save-hook 'lua-format-buffer nil 'local)
+                        ))
+         )
+  :custom
+  (lua-indent-level 4)
+  )
+
+(provide 'lang-lua)