feat(lang): improve yaml formatting and enable lsp-mode

modules/languages/siren-yaml.el

@@ -6,7 +6,7 @@
 
 ;;; Code:
 
-(require 'siren-prettier-js)
+(require 'siren-lsp)
 (require 'siren-prog-mode)
 
 (use-package yaml-mode
@@ -20,10 +20,30 @@
   :init
   (defun siren-yaml-mode-setup ()
     (run-hooks 'prog-mode-hook)
-    (setq tab-width 2
-          prettier-js-args '("--parser" "yaml"))
+
+    ;; Configure prettier after local vars are processed, allowing local
+    ;; override of fill-column and have prettier respect it.
+    (add-hook 'hack-local-variables-hook
+              'siren-yaml-mode-setup-prettier nil t)
+
+    (setq tab-width 2)
     (prettier-js-mode)
-    (subword-mode +1)))
+    (subword-mode +1))
+
+  (defun siren-yaml-mode-setup-prettier ()
+    (setq-local prettier-js-args `("--parser" "yaml"
+                                   "--print-width" ,(number-to-string fill-column)
+                                   "--prose-wrap" "always"))))
+
+(use-package lsp-yaml
+  :straight lsp-mode
+
+  :hook
+  (yaml-mode . siren-lsp-yaml-mode-setup)
+
+  :init
+  (defun siren-lsp-yaml-mode-setup ()
+    (lsp-deferred)))
 
 (use-package yaml-imenu
   :after yaml-mode