Also inhibit user-save-mode with predicates

1 files changed, 19 insertions, 5 deletions

@@ -29,10 +29,16 @@ This option is only useful is `user-save-mode' is active when
 Emacs is killed."
   :type 'boolean)
 
-(defcustom user-save-inhibit '(special-mode)
+(defcustom user-save-inhibit-modes '(special-mode)
   "List of modes to inhibit `user-save-mode' from activation in."
   :type '(repeat symbol))
 
+(defcustom user-save-inhibit-predicates '(user-save-non-file-buffer-p)
+  "List of predicates to inhibit `user-save-mode' from activation.
+Each predicate will be called with no arguments, and if it
+returns t, will inhibit `user-save-mode' from activating."
+  :type '(repeat function))
+
 (defvar user-save-hook nil
   "Hook to run when the user, not Emacs, saves the buffer.")
 
@@ -47,7 +53,13 @@ This map shadows the default map for `save-buffer'.")
   "Run the hooks in `user-save-hook'.
 This does /not/ also save the buffer."
   (with-demoted-errors "User-save-hook error: %S"
-      (run-hooks 'user-save-hook)))
+    (run-hooks 'user-save-hook)))
+
+(defun user-save-non-file-buffer-p (&optional buffer-or-name)
+  "Return whether BUFFER-OR-NAME is a non-file buffer.
+BUFFER-OR-NAME, if omitted, defaults to the current buffer."
+  (with-current-buffer (or buffer-or-name (current-buffer))
+    (not (buffer-file-name))))
 
 (defun user-save-buffer (&optional arg)
   "Save current buffer in visited file if modified.
@@ -99,9 +111,11 @@ whether the buffer needs to be saved."
 (defun user-save-mode-in-some-buffers ()
   "Enable `user-save-mode', but only in some buffers.
 The mode will not be enabled in buffers derived from modes in
-`user-save-inhibit', or in the minibuffer."
-  (unless (or (cl-some #'derived-mode-p user-save-inhibit)
-              (minibufferp))
+`user-save-inhibit-modes', those for which
+`user-save-inhibit-predicates' return t, or in the minibuffer."
+  (unless (or (minibufferp)
+              (cl-some #'derived-mode-p user-save-inhibit-modes)
+              (run-hook-with-args-until-failure 'user-save-inhibit-predicates))
     (user-save-mode +1)))
 
 ;;;###autoload