Add & use add-transient-hook! macro

core/core-lib.el

@@ -65,6 +65,19 @@ compilation."
                (save-silently t))
        ,@forms)))
 
+(defmacro add-transient-hook! (hook &rest forms)
+  "Attaches transient forms to a hook (can also be a function, which will be
+advised instead). These forms will be evaluated only once when that
+function/hook is first invoked, then it detaches itself."
+  (let ((fn (intern (format "doom--transient-hook-%s" hook))))
+    `(progn
+       (defun ,fn (&rest _)
+         ,@forms
+         ,(cond ((functionp hook) `(advice-remove ',hook ',fn))
+                ((symbolp hook) `(remove-hook ',hook ',fn))))
+       ,(cond ((functionp hook) `(advice-add ',hook :before ',fn))
+              ((symbolp hook) `(add-hook ',hook ',fn))))))
+
 (defmacro add-hook! (&rest args)
   "A convenience macro for `add-hook'. Takes, in order:
 

modules/feature/snippets/config.el

@@ -13,10 +13,7 @@
   :init
   ;; Ensure `yas-reload-all' is called as late as possible. Other modules could
   ;; have additional configuration for yasnippet. For example, file-templates.
-  (add-hook 'yas-minor-mode-hook '+snippets|load)
-  (defun +snippets|load (&rest _)
-    (yas-reload-all)
-    (remove-hook 'yas-minor-mode-hook '+snippets|load))
+  (add-transient-hook! yas-minor-mode-hook (yas-reload-all))
 
   (add-hook! (text-mode prog-mode snippet-mode markdown-mode org-mode)
     'yas-minor-mode-on)

modules/ui/doom-modeline/config.el

@@ -33,10 +33,8 @@
 ;; mode-line.
 (def-package! evil-anzu
   :init
-  (defun +evil*lazy-load-evil-anzu (&rest _) (require 'evil-anzu))
-  (advice-add 'evil-ex-start-search :before '+evil*lazy-load-evil-anzu)
+  (add-transient-hook! evil-ex-start-search (require 'evil-anzu))
   :config
-  (advice-remove 'evil-ex-start-search '+evil*lazy-load-evil-anzu)
   (setq anzu-cons-mode-line-p nil
         anzu-minimum-input-length 1
         anzu-search-threshold 250))