💥 Refactor add-hook! macro & change arg order

This update may potentially break your usage of add-hook! if you pass
the :local or :append properties to it. This is how they used to work:

  (add-hook! :append 'some-mode-hook #'do-something)

Thsoe properties must now follow the hooks, e.g.

  (add-hook! 'some-mode-hook :append #'do-something)

Other changes:
- Various add-hook calls have been renamed to add-hook! because I
  incorrectly assumed `defun` always returned its definition's symbol,
  when in fact, its return value is "undefined" (so sayeth the
  documentation). This should fix #1597.
- This update adds the ability to add multiple functions to hooks
  without a list:

    (add-hook! 'some-mode-hook
               #'do-something
               #'do-something-else)

- The indentation logic has been changed so that consecutive function
  symbols at indented at the same level as the first argument, but forms
  are indent like a defun.

    (add-hook! 'some-mode-hook
               #'do-something
               #'do-something-else)

    (add-hook! 'some-mode-hook
      (message "Hello"))

modules/email/mu4e/config.el

@@ -168,7 +168,7 @@
     ;; Without it, refiling (archiving), trashing, and flagging (starring) email
     ;; won't properly result in the corresponding gmail action, since the marks
     ;; are ineffectual otherwise.
-    (add-hook 'mu4e-mark-execute-pre-hook
+    (add-hook! 'mu4e-mark-execute-pre-hook
       (defun +mu4e-gmail-fix-flags-h (mark msg)
         (pcase mark
           (`trash  (mu4e-action-retag-message msg "-\\Inbox,+\\Trash,-\\Draft"))

modules/email/notmuch/autoload.el

@@ -89,7 +89,7 @@
 ;; Advice
 
 ;;;###autoload
-(defun +notmuch*dont-confirm-on-kill-process (orig-fn &rest args)
+(defun +notmuch-dont-confirm-on-kill-process-a (orig-fn &rest args)
   "Don't prompt for confirmation when killing notmuch sentinel."
   (let (confirm-kill-processes)
     (apply orig-fn args)))

modules/email/notmuch/config.el

@@ -42,13 +42,15 @@
 
   ;; (setq-hook! 'notmuch-show-mode-hook line-spacing 0)
 
-  (add-to-list 'doom-real-buffer-functions #'notmuch-interesting-buffer nil #'eq)
+  (add-hook 'doom-real-buffer-functions #'notmuch-interesting-buffer)
 
-  (advice-add #'notmuch-start-notmuch-sentinel :around #'+notmuch*dont-confirm-on-kill-process)
+  (advice-add #'notmuch-start-notmuch-sentinel :around #'+notmuch-dont-confirm-on-kill-process-a)
 
   ;; modeline doesn't have much use in these modes
-  (add-hook! (notmuch-show-mode notmuch-tree-mode notmuch-search-mode)
-    #'hide-mode-line-mode))
+  (add-hook! '(notmuch-show-mode-hook
+               notmuch-tree-mode-hook
+               notmuch-search-mode-hook)
+             #'hide-mode-line-mode))
 
 
 (use-package! org-mime

modules/email/wanderlust/config.el

@@ -74,6 +74,6 @@
     ;; Neither wl-folder-mode or wl-summary-mode are correctly defined as major
     ;; modes, so `evil-set-initial-state' won't work here.
     (add-hook! '(wl-folder-mode-hook wl-summary-mode-hook)
-      #'evil-emacs-state))
+               #'evil-emacs-state))
 
   (add-hook 'mime-edit-mode-hook #'auto-fill-mode))