(show_help_echo): New function, extracted from read_char.

[gnu-emacs] / lisp / custom.el

diff --git a/lisp/custom.el b/lisp/custom.el
index 7c872e040525fcf524a6d711a4684d1949a899a7..a724d497f5999e89744d6d2a5a8c15c2bc4433d0 100644 (file)
--- a/lisp/custom.el
+++ b/lisp/custom.el
@@ -1,11 +1,10 @@
 ;;; custom.el -- Tools for declaring and initializing options.
 ;;
 ;;; custom.el -- Tools for declaring and initializing options.
 ;;

-;; Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+;; Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc.

 ;;
 ;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
 ;;
 ;; Author: Per Abrahamsen <abraham@dina.kvl.dk>

+;; Maintainer: FSF

 ;; Keywords: help, faces
 ;; Keywords: help, faces

-;; Version: 1.97
-;; X-URL: http://www.dina.kvl.dk/~abraham/custom/

 
 ;; This file is part of GNU Emacs.
 
 
 ;; This file is part of GNU Emacs.
 


@@ -26,11 +25,9 @@
 
 ;;; Commentary:
 ;;
 
 ;;; Commentary:
 ;;

-;; If you want to use this code, please visit the URL above.
-;;

 ;; This file only contain the code needed to declare and initialize
 ;; user options.  The code to customize options is autoloaded from
 ;; This file only contain the code needed to declare and initialize
 ;; user options.  The code to customize options is autoloaded from

-;; `cus-edit.el'. 
+;; `cus-edit.el' and is documented in the Emacs Lisp Reference manual.

 
 ;; The code implementing face declarations is in `cus-face.el'
 
 
 ;; The code implementing face declarations is in `cus-face.el'
 


@@ -38,10 +35,6 @@
 
 (require 'widget)
 
 
 (require 'widget)
 

-(define-widget-keywords :initialize :set :get :require :prefix :tag
-  :load :link :options :type :group) 
-
-

 (defvar custom-define-hook nil
   ;; Customize information for this option is in `cus-edit.el'.
   "Hook called after defining each customize option.")
 (defvar custom-define-hook nil
   ;; Customize information for this option is in `cus-edit.el'.
   "Hook called after defining each customize option.")


@@ -56,28 +49,33 @@ the car of that and used as the default binding for symbol.
 Otherwise, VALUE will be evaluated and used as the default binding for
 symbol."
   (unless (default-boundp symbol)
 Otherwise, VALUE will be evaluated and used as the default binding for
 symbol."
   (unless (default-boundp symbol)

-    ;; Use the saved value if it exists, otherwise the factory setting.
+    ;; Use the saved value if it exists, otherwise the standard setting.

     (set-default symbol (if (get symbol 'saved-value)
                            (eval (car (get symbol 'saved-value)))
                          (eval value)))))
 
 (defun custom-initialize-set (symbol value)
     (set-default symbol (if (get symbol 'saved-value)
                            (eval (car (get symbol 'saved-value)))
                          (eval value)))))
 
 (defun custom-initialize-set (symbol value)

-  "Initialize SYMBOL with VALUE.
-Like `custom-initialize-default', but use the function specified by
-`:set' to initialize SYMBOL."
+  "Initialize SYMBOL based on VALUE.
+If the symbol doesn't have a default binding already,
+then set it using its `:set' function (or `set-default' if it has none).
+The value is either the value in the symbol's `saved-value' property,
+if any, or VALUE."

   (unless (default-boundp symbol)
     (funcall (or (get symbol 'custom-set) 'set-default)
   (unless (default-boundp symbol)
     (funcall (or (get symbol 'custom-set) 'set-default)

-            symbol 
+            symbol

             (if (get symbol 'saved-value)
                 (eval (car (get symbol 'saved-value)))
               (eval value)))))
 
 (defun custom-initialize-reset (symbol value)
             (if (get symbol 'saved-value)
                 (eval (car (get symbol 'saved-value)))
               (eval value)))))
 
 (defun custom-initialize-reset (symbol value)

-  "Initialize SYMBOL with VALUE.
-Like `custom-initialize-set', but use the function specified by
-`:get' to reinitialize SYMBOL if it is already bound."
+  "Initialize SYMBOL based on VALUE.
+Set the symbol, using its `:set' function (or `set-default' if it has none).
+The value is either the symbol's current value
+ \(as obtained using the `:get' function), if any,
+or the value in the symbol's `saved-value' property if any,
+or (last of all) VALUE."

     (funcall (or (get symbol 'custom-set) 'set-default)
     (funcall (or (get symbol 'custom-set) 'set-default)

-            symbol 
+            symbol

             (cond ((default-boundp symbol)
                    (funcall (or (get symbol 'custom-get) 'default-value)
                             symbol))
             (cond ((default-boundp symbol)
                    (funcall (or (get symbol 'custom-get) 'default-value)
                             symbol))


@@ -88,8 +86,9 @@ Like `custom-initialize-set', but use the function specified by
 
 (defun custom-initialize-changed (symbol value)
   "Initialize SYMBOL with VALUE.
 
 (defun custom-initialize-changed (symbol value)
   "Initialize SYMBOL with VALUE.

-Like `custom-initialize-reset', but only use the `:set' function if the 
-not using the factory setting.  Otherwise, use the `set-default'."
+Like `custom-initialize-reset', but only use the `:set' function if the
+not using the standard setting.
+For the standard setting, use the `set-default'."

   (cond ((default-boundp symbol)
         (funcall (or (get symbol 'custom-set) 'set-default)
                  symbol
   (cond ((default-boundp symbol)
         (funcall (or (get symbol 'custom-set) 'set-default)
                  symbol


@@ -102,19 +101,20 @@ not using the factory setting.  Otherwise, use the `set-default'."
        (t
         (set-default symbol (eval value)))))
 
        (t
         (set-default symbol (eval value)))))
 

-(defun custom-declare-variable (symbol value doc &rest args)
-  "Like `defcustom', but SYMBOL and VALUE are evaluated as normal arguments."
-  ;; Remember the factory setting.
-  (put symbol 'factory-value (list value))
+(defun custom-declare-variable (symbol default doc &rest args)
+  "Like `defcustom', but SYMBOL and DEFAULT are evaluated as normal arguments.
+DEFAULT should be an expression to evaluate to compute the default value,
+not the default value itself."
+  ;; Remember the standard setting.
+  (put symbol 'standard-value (list default))

   ;; Maybe this option was rogue in an earlier version.  It no longer is.
   (when (get symbol 'force-value)
   ;; Maybe this option was rogue in an earlier version.  It no longer is.
   (when (get symbol 'force-value)

-    ;; It no longer is.    

     (put symbol 'force-value nil))
   (when doc
     (put symbol 'variable-documentation doc))
     (put symbol 'force-value nil))
   (when doc
     (put symbol 'variable-documentation doc))

-  (let ((initialize 'custom-initialize-set)
+  (let ((initialize 'custom-initialize-reset)

        (requests nil))
        (requests nil))

-    (while args 
+    (while args

       (let ((arg (car args)))
        (setq args (cdr args))
        (unless (symbolp arg)
       (let ((arg (car args)))
        (setq args (cdr args))
        (unless (symbolp arg)


@@ -133,7 +133,7 @@ not using the factory setting.  Otherwise, use the `set-default'."
                ((eq keyword :require)
                 (setq requests (cons value requests)))
                ((eq keyword :type)
                ((eq keyword :require)
                 (setq requests (cons value requests)))
                ((eq keyword :type)

-                (put symbol 'custom-type value))
+                (put symbol 'custom-type (purecopy value)))

                ((eq keyword :options)
                 (if (get symbol 'custom-options)
                     ;; Slow safe code to avoid duplicates.
                ((eq keyword :options)
                 (if (get symbol 'custom-options)
                     ;; Slow safe code to avoid duplicates.


@@ -147,7 +147,8 @@ not using the factory setting.  Otherwise, use the `set-default'."
                                        'custom-variable))))))
     (put symbol 'custom-requests requests)
     ;; Do the actual initialization.
                                        'custom-variable))))))
     (put symbol 'custom-requests requests)
     ;; Do the actual initialization.

-    (funcall initialize symbol value))
+    (funcall initialize symbol default))
+  (setq current-load-list (cons symbol current-load-list))

   (run-hooks 'custom-define-hook)
   symbol)
 
   (run-hooks 'custom-define-hook)
   symbol)
 


@@ -159,33 +160,46 @@ Neither SYMBOL nor VALUE needs to be quoted.
 If SYMBOL is not already bound, initialize it to VALUE.
 The remaining arguments should have the form
 
 If SYMBOL is not already bound, initialize it to VALUE.
 The remaining arguments should have the form
 

-   [KEYWORD VALUE]... 
+   [KEYWORD VALUE]...

 
 

-The following KEYWORD's are defined:
+The following keywords are meaningful:

 
 :type  VALUE should be a widget type for editing the symbols value.
        The default is `sexp'.
 :options VALUE should be a list of valid members of the widget type.
 
 :type  VALUE should be a widget type for editing the symbols value.
        The default is `sexp'.
 :options VALUE should be a list of valid members of the widget type.

-:group  VALUE should be a customization group.  
+:group  VALUE should be a customization group.

         Add SYMBOL to that group.
         Add SYMBOL to that group.

-:initialize VALUE should be a function used to initialize the
+:initialize
+       VALUE should be a function used to initialize the

        variable.  It takes two arguments, the symbol and value
        given in the `defcustom' call.  The default is
        variable.  It takes two arguments, the symbol and value
        given in the `defcustom' call.  The default is

-       `custom-initialize-default' 
-:set   VALUE should be a function to set the value of the symbol. 
+       `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
        It takes two arguments, the symbol to set and the value to

-       give it.  The default 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
 :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 is
-       `default-value'. 
-:require VALUE should be a feature symbol.  Each feature will be
-       required after initialization, of the the user have saved this
-       option.
+       the current value for that symbol.  The default choice of function
+       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,
+       it does (require VALUE) first.
+:version
+        VALUE should be a string specifying that the variable was
+        first introduced, or its default value was changed, in Emacs
+        version VERSION.

 
 Read the section about customization in the Emacs Lisp manual for more
 information."
 
 Read the section about customization in the Emacs Lisp manual for more
 information."

-  `(custom-declare-variable (quote ,symbol) (quote ,value) ,doc ,@args))
+  ;; It is better not to use backquote in this file,
+  ;; because that makes a bootstrapping problem
+  ;; if you need to recompile all the Lisp files using interpreted code.
+  (nconc (list 'custom-declare-variable
+              (list 'quote symbol)
+              (list 'quote value)
+              doc)
+        args))

 
 ;;; The `defface' Macro.
 
 
 ;;; The `defface' Macro.
 


@@ -203,26 +217,33 @@ The remaining arguments should have the form
 
    [KEYWORD VALUE]...
 
 
    [KEYWORD VALUE]...
 

-The following KEYWORD's are defined:
+The following KEYWORDs are defined:

 
 :group  VALUE should be a customization group.
         Add FACE to that group.
 
 SPEC should be an alist of the form ((DISPLAY ATTS)...).
 
 
 :group  VALUE should be a customization group.
         Add FACE to that group.
 
 SPEC should be an alist of the form ((DISPLAY ATTS)...).
 

-ATTS is a list of face attributes and their values.  The possible
-attributes are defined in the variable `custom-face-attributes'.
+The first element of SPEC where the DISPLAY matches the frame
+is the one that takes effect in that frame.  The ATTRs in this
+element take effect; the other elements are ignored, on that frame.
+
+ATTS is a list of face attributes followed by their values:
+  (ATTR VALUE ATTR VALUE...)

 
 

-The ATTS of the first entry in SPEC where the DISPLAY matches the
-frame should take effect in that frame.  DISPLAY can either be the
-symbol t, which will match all frames, or an alist of the form
-\((REQ ITEM...)...)
+The possible attributes are `:family', `:width', `:height', `:weight',
+`:slant', `:underline', `:overline', `:strike-through', `:box',
+`:foreground', `:background', `:stipple', and `:inverse-video'.

 
 

-For the DISPLAY to match a FRAME, the REQ property of the frame must
-match one of the ITEM.  The following REQ are defined:
+DISPLAY can either be the symbol t, which will match all frames, or an
+alist of the form \((REQ ITEM...)...).  For the DISPLAY to match a
+FRAME, the REQ property of the frame must match one of the ITEM.  The
+following REQ are defined:

 
 `type' (the value of `window-system')
 
 `type' (the value of `window-system')

-  Should be one of `x' or `tty'.
+  Under X, in addition to the values `window-system' can take,
+  `motif', `lucid' and `x-toolkit' are allowed, and match when
+  the Motif toolkit, Lucid toolkit, or any X toolkit is in use.

 
 `class' (the frame's color support)
   Should be one of `color', `grayscale', or `mono'.
 
 `class' (the frame's color support)
   Should be one of `color', `grayscale', or `mono'.


@@ -232,19 +253,23 @@ match one of the ITEM.  The following REQ are defined:
 
 Read the section about customization in the Emacs Lisp manual for more
 information."
 
 Read the section about customization in the Emacs Lisp manual for more
 information."

-  `(custom-declare-face (quote ,face) ,spec ,doc ,@args))
+  ;; It is better not to use backquote in this file,
+  ;; because that makes a bootstrapping problem
+  ;; if you need to recompile all the Lisp files using interpreted code.
+  (nconc (list 'custom-declare-face (list 'quote face) spec doc) args))

 
 ;;; The `defgroup' Macro.
 
 (defun custom-declare-group (symbol members doc &rest args)
   "Like `defgroup', but SYMBOL is evaluated as a normal argument."
 
 ;;; The `defgroup' Macro.
 
 (defun custom-declare-group (symbol members doc &rest args)
   "Like `defgroup', but SYMBOL is evaluated as a normal argument."

-  (while members 
+  (while members

     (apply 'custom-add-to-group symbol (car members))
     (setq members (cdr members)))
   (put symbol 'custom-group (nconc members (get symbol 'custom-group)))
   (when doc
     (apply 'custom-add-to-group symbol (car members))
     (setq members (cdr members)))
   (put symbol 'custom-group (nconc members (get symbol 'custom-group)))
   (when doc

-    (put symbol 'group-documentation doc))
-  (while args 
+    ;; This text doesn't get into DOC.
+    (put symbol 'group-documentation (purecopy doc)))
+  (while args

     (let ((arg (car args)))
       (setq args (cdr args))
       (unless (symbolp arg)
     (let ((arg (car args)))
       (setq args (cdr args))
       (unless (symbolp arg)


@@ -269,22 +294,28 @@ SYMBOL does not need to be quoted.
 Third arg DOC is the group documentation.
 
 MEMBERS should be an alist of the form ((NAME WIDGET)...) where
 Third arg DOC is the group documentation.
 
 MEMBERS should be an alist of the form ((NAME WIDGET)...) where

-NAME is a symbol and WIDGET is a widget is a widget for editing that
-symbol.  Useful widgets are `custom-variable' for editing variables,
+NAME is a symbol and WIDGET is a widget for editing that symbol.
+Useful widgets are `custom-variable' for editing variables,

 `custom-face' for edit faces, and `custom-group' for editing groups.
 
 The remaining arguments should have the form
 
 `custom-face' for edit faces, and `custom-group' for editing groups.
 
 The remaining arguments should have the form
 

-   [KEYWORD VALUE]... 
+   [KEYWORD VALUE]...

 
 

-The following KEYWORD's are defined:
+The following KEYWORDs are defined:

 
 

-:group  VALUE should be a customization group.
-        Add SYMBOL to that group.
+:group   VALUE should be a customization group.
+         Add SYMBOL to that group.
+
+:version VALUE should be a string specifying that the group was introduced
+         in Emacs version VERSION.

 
 Read the section about customization in the Emacs Lisp manual for more
 information."
 
 Read the section about customization in the Emacs Lisp manual for more
 information."

-  `(custom-declare-group (quote ,symbol) ,members ,doc ,@args))
+  ;; It is better not to use backquote in this file,
+  ;; because that makes a bootstrapping problem
+  ;; if you need to recompile all the Lisp files using interpreted code.
+  (nconc (list 'custom-declare-group (list 'quote symbol) members doc) args))

 
 (defun custom-add-to-group (group option widget)
   "To existing GROUP add a new OPTION of type WIDGET.
 
 (defun custom-add-to-group (group option widget)
   "To existing GROUP add a new OPTION of type WIDGET.


@@ -300,7 +331,7 @@ If there already is an entry for that option, overwrite it."
 (defun custom-handle-all-keywords (symbol args type)
   "For customization option SYMBOL, handle keyword arguments ARGS.
 Third argument TYPE is the custom option type."
 (defun custom-handle-all-keywords (symbol args type)
   "For customization option SYMBOL, handle keyword arguments ARGS.
 Third argument TYPE is the custom option type."

-  (while args 
+  (while args

     (let ((arg (car args)))
       (setq args (cdr args))
       (unless (symbolp arg)
     (let ((arg (car args)))
       (setq args (cdr args))
       (unless (symbolp arg)


@@ -310,22 +341,47 @@ Third argument TYPE is the custom option type."
        (unless args
          (error "Keyword %s is missing an argument" keyword))
        (setq args (cdr args))
        (unless args
          (error "Keyword %s is missing an argument" keyword))
        (setq args (cdr args))

-       (custom-handle-keyword symbol keyword value type)))))  
+       (custom-handle-keyword symbol keyword value type)))))

 
 (defun custom-handle-keyword (symbol keyword value type)
   "For customization option SYMBOL, handle KEYWORD with VALUE.
 Fourth argument TYPE is the custom option type."
 
 (defun custom-handle-keyword (symbol keyword value type)
   "For customization option SYMBOL, handle KEYWORD with VALUE.
 Fourth argument TYPE is the custom option type."

+  (if purify-flag
+      (setq value (purecopy value)))

   (cond ((eq keyword :group)
         (custom-add-to-group value symbol type))
   (cond ((eq keyword :group)
         (custom-add-to-group value symbol type))

+       ((eq keyword :version)
+        (custom-add-version symbol value))

        ((eq keyword :link)
         (custom-add-link symbol value))
        ((eq keyword :load)
         (custom-add-load symbol value))
        ((eq keyword :tag)
         (put symbol 'custom-tag value))
        ((eq keyword :link)
         (custom-add-link symbol value))
        ((eq keyword :load)
         (custom-add-load symbol value))
        ((eq keyword :tag)
         (put symbol 'custom-tag value))

+       ((eq keyword :set-after)
+        (custom-add-dependencies symbol value))

        (t
        (t

-        (error "Unknown keyword %s" symbol))))  
-
+        (error "Unknown keyword %s" keyword))))
+
+(defun custom-add-dependencies (symbol value)
+  "To the custom option SYMBOL, add dependencies specified by VALUE.
+VALUE should be a list of symbols.  For each symbol in that list,
+this specifies that SYMBOL should be set after the specified symbol, if
+both appear in constructs like `custom-set-variables'."
+  (unless (listp value)
+    (error "Invalid custom dependency `%s'" value))
+  (let* ((deps (get symbol 'custom-dependencies))
+        (new-deps deps))
+    (while value
+      (let ((dep (car value)))
+       (unless (symbolp dep)
+         (error "Invalid custom dependency `%s'" dep))
+       (unless (memq dep new-deps)
+         (setq new-deps (cons dep new-deps)))
+       (setq value (cdr value))))
+    (unless (eq deps new-deps)
+      (put symbol 'custom-dependencies new-deps))))
+  

 (defun custom-add-option (symbol option)
   "To the variable SYMBOL add OPTION.
 
 (defun custom-add-option (symbol option)
   "To the variable SYMBOL add OPTION.
 


@@ -339,47 +395,82 @@ For other types variables, the effect is undefined."
   "To the custom option SYMBOL add the link WIDGET."
   (let ((links (get symbol 'custom-links)))
     (unless (member widget links)
   "To the custom option SYMBOL add the link WIDGET."
   (let ((links (get symbol 'custom-links)))
     (unless (member widget links)

-      (put symbol 'custom-links (cons widget links)))))
+      (put symbol 'custom-links (cons (purecopy widget) links)))))
+
+(defun custom-add-version (symbol version)
+  "To the custom option SYMBOL add the version VERSION."
+  (put symbol 'custom-version (purecopy version)))

 
 (defun custom-add-load (symbol load)
   "To the custom option SYMBOL add the dependency LOAD.
 LOAD should be either a library file name, or a feature name."
   (let ((loads (get symbol 'custom-loads)))
     (unless (member load loads)
 
 (defun custom-add-load (symbol load)
   "To the custom option SYMBOL add the dependency LOAD.
 LOAD should be either a library file name, or a feature name."
   (let ((loads (get symbol 'custom-loads)))
     (unless (member load loads)

-      (put symbol 'custom-loads (cons load loads)))))
+      (put symbol 'custom-loads (cons (purecopy load) loads)))))

 
 ;;; Initializing.
 
 
 ;;; 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)
 (defun custom-set-variables (&rest args)

-  "Initialize variables according to user preferences.  
+  "Initialize variables according to user preferences.

 
 The arguments should be a list where each entry has the form:
 
 
 The arguments should be a list where each entry has the form:
 

-  (SYMBOL VALUE [NOW])
+  (SYMBOL VALUE [NOW [REQUEST [COMMENT]]])

 
 The unevaluated VALUE is stored as the saved value for SYMBOL.
 If NOW is present and non-nil, VALUE is also evaluated and bound as
 
 The unevaluated VALUE is stored as the saved value for SYMBOL.
 If NOW is present and non-nil, VALUE is also evaluated and bound as

-the default value for the SYMBOL."
-  (while args 
+the default value for the SYMBOL.
+REQUEST is a list of features we must require for SYMBOL.
+COMMENT is a comment string about SYMBOL."
+  (setq args
+       (sort args
+             (lambda (a1 a2)
+               (let* ((sym1 (car a1))
+                      (sym2 (car a2))
+                      (1-then-2 (memq sym1 (get sym2 'custom-dependencies)))
+                      (2-then-1 (memq sym2 (get sym1 'custom-dependencies))))
+                 (cond ((and 1-then-2 2-then-1)
+                        (error "Circular custom dependency between `%s' and `%s'"
+                               sym1 sym2))
+                       (2-then-1 nil)
+                       (t t))))))
+  (while args

     (let ((entry (car args)))
       (if (listp entry)
          (let* ((symbol (nth 0 entry))
                 (value (nth 1 entry))
                 (now (nth 2 entry))
                 (requests (nth 3 entry))
     (let ((entry (car args)))
       (if (listp entry)
          (let* ((symbol (nth 0 entry))
                 (value (nth 1 entry))
                 (now (nth 2 entry))
                 (requests (nth 3 entry))

-                (set (or (get symbol 'custom-set) 'set-default)))
-           (put symbol 'saved-value (list value))
-           (cond (now 
-                  ;; Rogue variable, set it now.
-                  (put symbol 'force-value t)
-                  (funcall set symbol (eval value)))
-                 ((default-boundp symbol)
-                  ;; Something already set this, overwrite it.
-                  (funcall set symbol (eval value))))
+                (comment (nth 4 entry))
+                set)

            (when requests
              (put symbol 'custom-requests requests)
              (mapcar 'require requests))
            (when requests
              (put symbol 'custom-requests requests)
              (mapcar 'require requests))

-           (setq args (cdr args)))
+           (setq set (or (get symbol 'custom-set) 'custom-set-default))
+           (put symbol 'saved-value (list value))
+           (put symbol 'saved-variable-comment comment)
+           ;; Allow for errors in the case where the setter has
+           ;; changed between versions, say.
+           (condition-case nil
+               (cond (now
+                      ;; Rogue variable, set it now.
+                      (put symbol 'force-value t)
+                      (funcall set symbol (eval value)))
+                     ((default-boundp symbol)
+                      ;; Something already set this, overwrite it.
+                      (funcall set symbol (eval value))))
+             (error nil))
+           (setq args (cdr args))
+           (and (or now (default-boundp symbol))
+                (put symbol 'variable-comment comment)))

        ;; Old format, a plist of SYMBOL VALUE pairs.
        (message "Warning: old format `custom-set-variables'")
        (ding)
        ;; Old format, a plist of SYMBOL VALUE pairs.
        (message "Warning: old format `custom-set-variables'")
        (ding)


@@ -389,8 +480,23 @@ the default value for the SYMBOL."
          (put symbol 'saved-value (list value)))
        (setq args (cdr (cdr args)))))))
 
          (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.
 
 ;;; The End.
 

+;; Process the defcustoms for variables loaded before this file.
+(while custom-declare-variable-list
+  (apply 'custom-declare-variable (car custom-declare-variable-list))
+  (setq custom-declare-variable-list (cdr custom-declare-variable-list)))
+

 (provide 'custom)
 
 (provide 'custom)
 

-;; custom.el ends here
+;;; custom.el ends here