(custom-set-default): New function.

(custom-set-variables): Use custom-set-default.
(custom-local-buffer): New variable.
(defcustom): Doc fix.

1 files changed, 21 insertions, 3 deletions

diff --git a/lisp/custom.el b/lisp/custom.el
index 7994f3686c4..fd90be477b2 100644
--- a/lisp/custom.el
+++ b/lisp/custom.el
@@ -184,11 +184,11 @@ The following keywords are meaningful:
         `custom-initialize-default' 
 :set    VALUE should be a function to set the value of the symbol. 
         It takes two arguments, the symbol to set and the value to
-        give it.  The default choice of function is `set-default'.
+        give it.  The default choice of function is `custom-set-default'.
 :get    VALUE should be a function to extract the value of symbol.
         The function takes one argument, a symbol, and should return
         the current value for that symbol.  The default choice of function
-        is `default-value'. 
+        is `custom-default-value'. 
 :require
         VALUE should be a feature symbol.  If you save a value
         for this option, then when your `.emacs' file loads the value,
@@ -383,6 +383,14 @@ LOAD should be either a library file name, or a feature name."
 
 ;;; Initializing.
 
+(defvar custom-local-buffer nil
+  "Non-nil, in a Customization buffer, means customize a specific buffer.
+If this variable is non-nil, it should be a buffer,
+and it means customize the local bindings of that buffer.
+This variable is a permanent local, and it normally has a local binding
+in every Customization buffer.")
+(put 'custom-local-buffer 'permanent-local t)
+
 (defun custom-set-variables (&rest args)
   "Initialize variables according to user preferences.  
 
@@ -400,7 +408,7 @@ the default value for the SYMBOL."
                  (value (nth 1 entry))
                  (now (nth 2 entry))
                  (requests (nth 3 entry))
-                 (set (or (get symbol 'custom-set) 'set-default)))
+                 (set (or (get symbol 'custom-set) 'custom-set-default)))
             (put symbol 'saved-value (list value))
             (cond (now 
                    ;; Rogue variable, set it now.
@@ -422,6 +430,16 @@ the default value for the SYMBOL."
           (put symbol 'saved-value (list value)))
         (setq args (cdr (cdr args)))))))
 
+(defun custom-set-default (variable value)
+  "Default :set function for a customizable variable.
+Normally, this sets the default value of VARIABLE to VALUE,
+but if `custom-local-buffer' is non-nil,
+this sets the local binding in that buffer instead."
+  (if custom-local-buffer
+      (with-current-buffer custom-local-buffer
+        (set variable value))
+    (set-default variable value)))
+
 ;;; The End.
 
 ;; Process the defcustoms for variables loaded before this file.