Fix emacs config.

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

@@ -0,0 +1,27 @@
+(defun yaml-format-buffer ()
+  "Run prettier."
+  (interactive)
+  (run-command-on-buffer "prettier" "--stdin-filepath" buffer-file-name)
+  )
+
+(use-package yaml-ts-mode
+  :mode
+  (
+   ("\\.y[a]?ml\\'" . yaml-ts-mode)
+   ("playbook\\.tmp\\'" . yaml-ts-mode)
+   ("environments/[^/]*/group_vars/[^/]*\\'" . yaml-ts-mode)
+   ("environments/[^/]*/host_vars/[^/]*\\'" . yaml-ts-mode)
+   )
+  :commands (yaml-ts-mode)
+  :hook (
+         (yaml-ts-mode . (lambda ()
+                        (add-hook 'before-save-hook 'yaml-format-buffer nil 'local)
+                        ))
+         )
+  :init
+  (add-to-list 'major-mode-remap-alist '(yaml-mode . yaml-ts-mode))
+  (add-to-list 'treesit-language-source-alist '(yaml "https://github.com/ikatyang/tree-sitter-yaml"))
+  (unless (treesit-ready-p 'yaml) (treesit-install-language-grammar 'yaml))
+  )
+
+(provide 'lang-yaml)