Re: [Emacs-diffs] emacs-25 040e0d6: Fix 'toggle-save-place'

[Stefan Monnier]

>> -;;;###autoload
> I'd like to keep the autoload, otherwise there's an asymmetry: the
> global mode is autoloaded, the local one isn't.

But there's no "local mode" yet.  That'll be added in 26.
For 25.1 there's only a "local toggle function".

It's mostly a question of name, admittedly.  

An alternative is to use the patch below, which is more intrusive.

diff --git a/lisp/saveplace.el b/lisp/saveplace.el
index 0233a52..b2140fb 100644
--- a/lisp/saveplace.el
+++ b/lisp/saveplace.el
@@ -120,6 +120,25 @@ save-place-ignore-files-regexp
 
 (declare-function dired-current-directory "dired" (&optional localp))
 
+(defun save-place--setup-hooks (add)
+  (cond
+   (add
+    (add-hook 'find-file-hook #'save-place-find-file-hook t)
+    (add-hook 'dired-initial-position-hook #'save-place-dired-hook)
+    (unless noninteractive
+      (add-hook 'kill-emacs-hook #'save-place-kill-emacs-hook))
+    (add-hook 'kill-buffer-hook #'save-place-to-alist))
+   (t
+    ;; We should remove the hooks, but only if save-place-mode
+    ;; is nil everywhere.  Is it worth the trouble, tho?
+    ;; (unless (or (default-value 'save-place-mode)
+    ;;             (cl-some <save-place-local-mode-p> (buffer-list)))
+    ;;   (remove-hook 'find-file-hook #'save-place-find-file-hook)
+    ;;   (remove-hook 'dired-initial-position-hook #'save-place-dired-hook)
+    ;;   (remove-hook 'kill-emacs-hook #'save-place-kill-emacs-hook)
+    ;;   (remove-hook 'kill-buffer-hook #'save-place-to-alist))
+    )))
+
 (define-obsolete-variable-alias 'save-place 'save-place-mode "25.1")
 ;;;###autoload
 (define-minor-mode save-place-mode
@@ -128,23 +147,14 @@ save-place-mode
 where it was when you previously visited the same file."
   :global t
   :group 'save-place
-  (cond
-   (save-place-mode
-    (add-hook 'find-file-hook 'save-place-find-file-hook t)
-    (add-hook 'dired-initial-position-hook 'save-place-dired-hook)
-    (unless noninteractive
-      (add-hook 'kill-emacs-hook 'save-place-kill-emacs-hook))
-    (add-hook 'kill-buffer-hook 'save-place-to-alist))
-   (t
-    (remove-hook 'find-file-hook 'save-place-find-file-hook t)
-    (remove-hook 'dired-initial-position-hook 'save-place-dired-hook)
-    (remove-hook 'kill-emacs-hook 'save-place-kill-emacs-hook)
-    (remove-hook 'kill-buffer-hook 'save-place-to-alist))))
+  (save-place--setup-hooks save-place-mode))
 
-(make-variable-buffer-local 'save-place-mode) ; Hysterical raisins.
+(make-variable-buffer-local 'save-place-mode)
 
+(define-obsolete-function-alias 'toggle-save-place
+  #'save-place-local-mode "25.1")
 ;;;###autoload
-(defun toggle-save-place (&optional parg) ;FIXME: save-place-local-mode!
+(define-minor-mode save-place-local-mode
   "Toggle whether to save your place in this file between sessions.
 If this mode is enabled, point is recorded when you kill the buffer
 or exit Emacs.  Visiting this file again will go to that position,
@@ -157,30 +167,13 @@ toggle-save-place
 file:
 
 \(save-place-mode 1)"
-  (interactive "P")
+  :variable save-place-mode
   (if (not (or buffer-file-name (and (derived-mode-p 'dired-mode)
                                      (boundp 'dired-subdir-alist)
                                     dired-subdir-alist
                                     (dired-current-directory))))
       (message "Buffer `%s' not visiting a file or directory" (buffer-name))
-    (setq save-place (if parg
-                         (> (prefix-numeric-value parg) 0)
-                       (not save-place)))
-    (cond
-     (save-place
-      (add-hook 'find-file-hook 'save-place-find-file-hook t)
-      (add-hook 'dired-initial-position-hook 'save-place-dired-hook)
-      (unless noninteractive
-        (add-hook 'kill-emacs-hook 'save-place-kill-emacs-hook))
-      (add-hook 'kill-buffer-hook 'save-place-to-alist))
-     (t
-      (remove-hook 'find-file-hook 'save-place-find-file-hook t)
-      (remove-hook 'dired-initial-position-hook 'save-place-dired-hook)
-      (remove-hook 'kill-emacs-hook 'save-place-kill-emacs-hook)
-      (remove-hook 'kill-buffer-hook 'save-place-to-alist)))
-    (message (if save-place
-                 "Place will be saved"
-               "No place will be saved in this file"))))
+    (save-place--setup-hooks save-place-mode)))
 
 (declare-function dired-get-filename "dired" (&optional localp 
no-error-if-not-filep))