(eshell-windows-shell-file): Look for command.com, not command.exe.

[gnu-emacs] / lisp / custom.el

diff --git a/lisp/custom.el b/lisp/custom.el
index 821e0f3232fa529984ed737e78c5348f160a1292..0831535f181f56206931674a21d849fee89a5514 100644 (file)
--- a/lisp/custom.el
+++ b/lisp/custom.el
@@ -1,10 +1,11 @@
-;;; custom.el -- Tools for declaring and initializing options.
+;;; custom.el --- tools for declaring and initializing options

 ;;
 ;;

-;; Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc.
+;; Copyright (C) 1996, 1997, 1999, 2001, 2002, 2003, 2004,
+;;   2005 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

-;; X-URL: http://www.dina.kvl.dk/~abraham/custom/ (probably obsolete)

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


@@ -20,16 +21,16 @@
 
 ;; You should have received a copy of the GNU General Public License
 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
 
 ;; You should have received a copy of the GNU General Public License
 ;; along with GNU Emacs; see the file COPYING.  If not, write to the

-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.

 
 ;;; Commentary:
 ;;
 
 ;;; Commentary:
 ;;

-;; This file only contain the code needed to declare and initialize
+;; This file only contains the code needed to declare and initialize

 ;; user options.  The code to customize options is autoloaded from
 ;; `cus-edit.el' and is documented in the Emacs Lisp Reference manual.
 
 ;; user options.  The code to customize options is autoloaded from
 ;; `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'.

 
 ;;; Code:
 
 
 ;;; Code:
 


@@ -39,13 +40,21 @@
   ;; Customize information for this option is in `cus-edit.el'.
   "Hook called after defining each customize option.")
 
   ;; Customize information for this option is in `cus-edit.el'.
   "Hook called after defining each customize option.")
 

+(defvar custom-dont-initialize nil
+  "Non-nil means `defcustom' should not initialize the variable.
+That is used for the sake of `custom-make-dependencies'.
+Users should not set it.")
+
+(defvar custom-current-group-alist nil
+  "Alist of (FILE . GROUP) indicating the current group to use for FILE.")
+

 ;;; The `defcustom' Macro.
 
 (defun custom-initialize-default (symbol value)
   "Initialize SYMBOL with VALUE.
 This will do nothing if symbol already has a default binding.
 Otherwise, if symbol has a `saved-value' property, it will evaluate
 ;;; The `defcustom' Macro.
 
 (defun custom-initialize-default (symbol value)
   "Initialize SYMBOL with VALUE.
 This will do nothing if symbol already has a default binding.
 Otherwise, if symbol has a `saved-value' property, it will evaluate

-the car of that and used as the default binding for symbol.
+the car of that and use it 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)


@@ -67,6 +76,28 @@ if any, or VALUE."
                 (eval (car (get symbol 'saved-value)))
               (eval value)))))
 
                 (eval (car (get symbol 'saved-value)))
               (eval value)))))
 

+(defun custom-initialize-safe-set (symbol value)
+  "Like `custom-initialize-set', but catches errors.
+If an error occurs during initialization, SYMBOL is set to nil
+and no error is thrown.  This is meant for use in pre-loaded files
+where some variables or functions used to compute VALUE may not yet
+be defined.  You can then re-evaluate VALUE in startup.el, for instance
+using `custom-reevaluate-setting'."
+  (condition-case nil
+      (custom-initialize-set symbol value)
+    (error (set-default symbol nil))))
+
+(defun custom-initialize-safe-default (symbol value)
+  "Like `custom-initialize-default', but catches errors.
+If an error occurs during initialization, SYMBOL is set to nil
+and no error is thrown.  This is meant for use in pre-loaded files
+where some variables or functions used to compute VALUE may not yet
+be defined.  You can then re-evaluate VALUE in startup.el, for instance
+using `custom-reevaluate-setting'."
+  (condition-case nil
+      (custom-initialize-default symbol value)
+    (error (set-default symbol nil))))
+

 (defun custom-initialize-reset (symbol value)
   "Initialize SYMBOL based on VALUE.
 Set the symbol, using its `:set' function (or `set-default' if it has none).
 (defun custom-initialize-reset (symbol value)
   "Initialize SYMBOL based on VALUE.
 Set the symbol, using its `:set' function (or `set-default' if it has none).


@@ -86,9 +117,9 @@ or (last of all) VALUE."
 
 (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
+Like `custom-initialize-reset', but only use the `:set' function if

 not using the standard setting.
 not using the standard setting.

-For the standard setting, use the `set-default'."
+For the standard setting, use `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


@@ -104,17 +135,21 @@ For the standard setting, use the `set-default'."
 (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,
 (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.
+not the default value itself.
+
+DEFAULT is stored as SYMBOL's standard value, in SYMBOL's property
+`standard-value'.  At the same time, SYMBOL's property `force-value' is
+set to nil, as the value is no longer rogue."

   (put symbol 'standard-value (list default))
   ;; Maybe this option was rogue in an earlier version.  It no longer is.
   (when (get symbol 'force-value)
   (put symbol 'standard-value (list default))
   ;; 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))
   (let ((initialize 'custom-initialize-reset)
        (requests nil))
     (put symbol 'force-value nil))
   (when doc
     (put symbol 'variable-documentation doc))
   (let ((initialize 'custom-initialize-reset)
        (requests nil))

+    (unless (memq :group args)
+      (custom-add-to-group (custom-current-group) symbol 'custom-variable))

     (while args
       (let ((arg (car args)))
        (setq args (cdr args))
     (while args
       (let ((arg (car args)))
        (setq args (cdr args))


@@ -132,15 +167,15 @@ not the default value itself."
                ((eq keyword :get)
                 (put symbol 'custom-get value))
                ((eq keyword :require)
                ((eq keyword :get)
                 (put symbol 'custom-get value))
                ((eq keyword :require)

-                (setq requests (cons value requests)))
+                (push value requests))

                ((eq keyword :type)
                ((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.

-                    (mapcar (lambda (option)
-                              (custom-add-option symbol option))
-                            value)
+                    (mapc (lambda (option)
+                            (custom-add-option symbol option))
+                          value)

                   ;; Fast code for the common case.
                   (put symbol 'custom-options (copy-sequence value))))
                (t
                   ;; Fast code for the common case.
                   (put symbol 'custom-options (copy-sequence value))))
                (t


@@ -148,8 +183,9 @@ not the default value itself."
                                        '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 default))
-  (setq current-load-list (cons symbol current-load-list))
+    (unless custom-dont-initialize
+      (funcall initialize symbol default)))
+  (push symbol current-load-list)

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


@@ -157,7 +193,7 @@ not the default value itself."
   "Declare SYMBOL as a customizable variable that defaults to VALUE.
 DOC is the variable documentation.
 
   "Declare SYMBOL as a customizable variable that defaults to VALUE.
 DOC is the variable documentation.
 

-Neither SYMBOL nor VALUE needs to be quoted.
+Neither SYMBOL nor VALUE need 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
 


@@ -165,16 +201,42 @@ The remaining arguments should have the form
 
 The following keywords are meaningful:
 
 
 The following keywords are meaningful:
 

-:type  VALUE should be a widget type for editing the symbols value.
-       The default is `sexp'.
+:type  VALUE should be a widget type for editing the symbol's value.

 :options VALUE should be a list of valid members of the widget type.
 :group  VALUE should be a customization group.
         Add SYMBOL to that group.
 :options VALUE should be a list of valid members of the widget type.
 :group  VALUE should be a customization group.
         Add SYMBOL to that group.

+:link LINK-DATA
+        Include an external link after the documentation string for this
+        item.  This is a sentence containing an active field which
+        references some other documentation.
+
+        There are three alternatives you can use for LINK-DATA:
+
+        (custom-manual INFO-NODE)
+             Link to an Info node; INFO-NODE is a string which specifies
+             the node name, as in \"(emacs)Top\".  The link appears as
+             `[manual]' in the customization buffer.
+
+        (info-link INFO-NODE)
+             Like `custom-manual' except that the link appears in the
+             customization buffer with the Info node name.
+
+        (url-link URL)
+             Link to a web page; URL is a string which specifies the URL.
+             The link appears in the customization buffer as URL.
+
+        You can specify the text to use in the customization buffer by
+        adding `:tag NAME' after the first element of the LINK-DATA; for
+        example, (info-link :tag \"foo\" \"(emacs)Top\") makes a link to the
+        Emacs manual which appears in the buffer as `foo'.
+
+        An item can have more than one external link; however, most items
+        have none at all.

 :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
 :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

-       `custom-initialize-default'
+       `custom-initialize-reset'.

 :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 `custom-set-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 `custom-set-default'.


@@ -186,6 +248,27 @@ The following keywords are meaningful:
        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.
        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.
+:tag LABEL
+        Use LABEL, a string, instead of the item's name, to label the item
+        in customization menus and buffers.
+:load FILE
+        Load file FILE (a string) before displaying this customization
+        item.  Loading is done with `load', and only if the file is
+        not already loaded.
+:set-after VARIABLES
+       Specifies that SYMBOL should be set after the list of variables
+        VARIABLES when both have been customized.
+
+If SYMBOL has a local binding, then this form affects the local
+binding.  This is normally not what you want.  Thus, if you need
+to load a file defining variables with this form, or with
+`defvar' or `defconst', you should always load that file
+_outside_ any bindings for these variables.  \(`defvar' and
+`defconst' behave similarly in this respect.)

 
 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."


@@ -206,7 +289,7 @@ FACE does not need to be quoted.
 
 Third argument DOC is the face documentation.
 
 
 Third argument DOC is the face documentation.
 

-If FACE has been set with `custom-set-face', set the face attributes
+If FACE has been set with `custom-set-faces', set the face attributes

 as specified by that function, otherwise set the face attributes
 according to SPEC.
 
 as specified by that function, otherwise set the face attributes
 according to SPEC.
 


@@ -221,26 +304,37 @@ The following KEYWORDs are defined:
 
 SPEC should be an alist of the form ((DISPLAY ATTS)...).
 
 
 SPEC should be an alist of the form ((DISPLAY ATTS)...).
 

-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.
+In the first element, DISPLAY can be :default.  The ATTS in that
+element then act as defaults for all the following elements.
+
+Aside from that, DISPLAY specifies conditions to match some or
+all frames.  For each frame, the first element of SPEC where the
+DISPLAY conditions are satisfied is the one that applies to that
+frame.  The ATTRs in this element take effect, and the following
+elements are ignored, on that frame.
+
+In the last element, DISPLAY can be t.  That element applies to a
+frame if none of the previous elements (except the :default if
+any) did.

 
 ATTS is a list of face attributes followed by their values:
   (ATTR VALUE ATTR VALUE...)
 
 The possible attributes are `:family', `:width', `:height', `:weight',
 `:slant', `:underline', `:overline', `:strike-through', `:box',
 
 ATTS is a list of face attributes followed by their values:
   (ATTR VALUE ATTR VALUE...)
 
 The possible attributes are `:family', `:width', `:height', `:weight',
 `:slant', `:underline', `:overline', `:strike-through', `:box',

-`:foreground', `:background', `:stipple', and `:inverse-video'.
+`:foreground', `:background', `:stipple', `:inverse-video', and `:inherit'.

 
 

-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:
+DISPLAY can be `:default' (only in the first element), the symbol
+t (only in the last element) to match all frames, or an alist of
+conditions of the form \(REQ ITEM...).  For such an alist to
+match a frame, each of the conditions must be satisfied, meaning
+that the REQ property of the frame must match one of the
+corresponding ITEMs.  These are the defined REQ values:

 
 `type' (the value of `window-system')
   Under X, in addition to the values `window-system' can take,
 
 `type' (the value of `window-system')
   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.
+  `motif', `lucid', `gtk' and `x-toolkit' are allowed, and match when
+  the Motif toolkit, Lucid toolkit, GTK 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'.


@@ -248,6 +342,15 @@ following REQ are defined:
 `background' (what color is used for the background text)
   Should be one of `light' or `dark'.
 
 `background' (what color is used for the background text)
   Should be one of `light' or `dark'.
 

+`min-colors' (the minimum number of colors the frame should support)
+  Should be an integer, it is compared with the result of
+  `display-color-cells'.
+
+`supports' (only match frames that support the specified face attributes)
+  Should be a list of face attributes.  See the documentation for
+  the function `display-supports-face-attributes-p' for more
+  information on exactly how testing is done.
+

 Read the section about customization in the Emacs Lisp manual for more
 information."
   ;; It is better not to use backquote in this file,
 Read the section about customization in the Emacs Lisp manual for more
 information."
   ;; It is better not to use backquote in this file,


@@ -257,14 +360,17 @@ information."
 
 ;;; The `defgroup' Macro.
 
 
 ;;; The `defgroup' Macro.
 

+(defun custom-current-group ()
+  (cdr (assoc load-file-name custom-current-group-alist)))
+

 (defun custom-declare-group (symbol members doc &rest args)
   "Like `defgroup', but SYMBOL is evaluated as a normal argument."
   (while members
     (apply 'custom-add-to-group symbol (car members))
     (setq members (cdr members)))
 (defun custom-declare-group (symbol members doc &rest args)
   "Like `defgroup', but SYMBOL is evaluated as a normal argument."
   (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
   (when doc

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

   (while args
     (let ((arg (car args)))
       (setq args (cdr args))
   (while args
     (let ((arg (car args)))
       (setq args (cdr args))


@@ -280,6 +386,10 @@ information."
              (t
               (custom-handle-keyword symbol keyword value
                                      'custom-group))))))
              (t
               (custom-handle-keyword symbol keyword value
                                      'custom-group))))))

+  ;; Record the group on the `current' list.
+  (let ((elt (assoc load-file-name custom-current-group-alist)))
+    (if elt (setcdr elt symbol)
+      (push (cons load-file-name symbol) custom-current-group-alist)))

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


@@ -298,10 +408,13 @@ 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."


@@ -312,18 +425,30 @@ information."
 
 (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.

-If there already is an entry for that option, overwrite it."
-  (let* ((members (get group 'custom-group))
-        (old (assq option members)))
-    (if old
-       (setcar (cdr old) widget)
-      (put group 'custom-group (nconc members (list (list option widget)))))))
+If there already is an entry for OPTION and WIDGET, nothing is done."
+  (let ((members (get group 'custom-group))
+       (entry (list option widget)))
+    (unless (member entry members)
+      (put group 'custom-group (nconc members (list entry))))))
+
+(defun custom-group-of-mode (mode)
+  "Return the custom group corresponding to the major or minor MODE.
+If no such group is found, return nil."
+  (or (get mode 'custom-mode-group)
+      (if (or (get mode 'custom-group)
+             (and (string-match "-mode\\'" (symbol-name mode))
+                  (get (setq mode (intern (substring (symbol-name mode)
+                                                     0 (match-beginning 0))))
+                       'custom-group)))
+         mode)))

 
 ;;; Properties.
 
 (defun custom-handle-all-keywords (symbol args type)
   "For customization option SYMBOL, handle keyword arguments ARGS.
 Third argument TYPE is the custom option type."
 
 ;;; Properties.
 
 (defun custom-handle-all-keywords (symbol args type)
   "For customization option SYMBOL, handle keyword arguments ARGS.
 Third argument TYPE is the custom option type."

+  (unless (memq :group args)
+    (custom-add-to-group (custom-current-group) symbol type))

   (while args
     (let ((arg (car args)))
       (setq args (cdr args))
   (while args
     (let ((arg (car args)))
       (setq args (cdr args))


@@ -339,6 +464,8 @@ Third 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."
 (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))
        ((eq keyword :version)
   (cond ((eq keyword :group)
         (custom-add-to-group value symbol type))
        ((eq keyword :version)


@@ -349,14 +476,37 @@ Fourth argument TYPE is the custom option type."
         (custom-add-load symbol value))
        ((eq keyword :tag)
         (put symbol 'custom-tag value))
         (custom-add-load symbol value))
        ((eq keyword :tag)
         (put symbol 'custom-tag value))

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

        (t
         (error "Unknown keyword %s" keyword))))
 
        (t
         (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.
 

-If SYMBOL is a hook variable, OPTION should be a hook member.
-For other types variables, the effect is undefined."
+If SYMBOL's custom type is a hook, OPTION should be a hook member.
+If SYMBOL's custom type is an alist, OPTION specifies a symbol
+to offer to the user as a possible key in the alist.
+For other custom types, this has no effect."

   (let ((options (get symbol 'custom-options)))
     (unless (member option options)
       (put symbol 'custom-options (cons option options)))))
   (let ((options (get symbol 'custom-options)))
     (unless (member option options)
       (put symbol 'custom-options (cons option options)))))


@@ -365,21 +515,146 @@ 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."
 
 (defun custom-add-version (symbol version)
   "To the custom option SYMBOL add the version VERSION."

-  (put symbol 'custom-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)))))
+
+(defun custom-autoload (symbol load)
+  "Mark SYMBOL as autoloaded custom variable and add dependency LOAD."
+  (put symbol 'custom-autoload t)
+  (custom-add-load symbol load))
+
+;; This test is also in the C code of `user-variable-p'.
+(defun custom-variable-p (variable)
+  "Return non-nil if VARIABLE is a custom variable.
+This recursively follows aliases."
+  (setq variable (indirect-variable variable))
+  (or (get variable 'standard-value)
+      (get variable 'custom-autoload)))
+
+;;; Loading files needed to customize a symbol.
+;;; This is in custom.el because menu-bar.el needs it for toggle cmds.
+
+(defvar custom-load-recursion nil
+  "Hack to avoid recursive dependencies.")
+
+(defun custom-load-symbol (symbol)
+  "Load all dependencies for SYMBOL."
+  (unless custom-load-recursion
+    (let ((custom-load-recursion t))
+      ;; Load these files if not already done,
+      ;; to make sure we know all the dependencies of SYMBOL.
+      (condition-case nil
+         (require 'cus-load)
+       (error nil))
+      (condition-case nil
+         (require 'cus-start)
+       (error nil))
+      (dolist (load (get symbol 'custom-loads))
+       (cond ((symbolp load) (condition-case nil (require load) (error nil)))
+             ;; This is subsumed by the test below, but it's much faster.
+             ((assoc load load-history))
+             ;; This was just (assoc (locate-library load) load-history)
+             ;; but has been optimized not to load locate-library
+             ;; if not necessary.
+             ((let ((regexp (concat "\\(\\`\\|/\\)" (regexp-quote load)
+                                    "\\(\\'\\|\\.\\)"))
+                    (found nil))
+                (dolist (loaded load-history)
+                  (and (stringp (car loaded))
+                       (string-match regexp (car loaded))
+                       (setq found t)))
+                found))
+             ;; Without this, we would load cus-edit recursively.
+             ;; We are still loading it when we call this,
+             ;; and it is not in load-history yet.
+             ((equal load "cus-edit"))
+             (t (condition-case nil (load load) (error nil))))))))
+\f
+(defvar custom-known-themes '(user standard)
+   "Themes that have been defined with `deftheme'.
+The default value is the list (user standard).  The theme `standard'
+contains the Emacs standard settings from the original Lisp files.  The
+theme `user' contains all the settings the user customized and saved.
+Additional themes declared with the `deftheme' macro will be added to
+the front of this list.")
+
+(defsubst custom-theme-p (theme)
+  "Non-nil when THEME has been defined."
+  (memq theme custom-known-themes))
+
+(defsubst custom-check-theme (theme)
+  "Check whether THEME is valid, and signal an error if it is not."
+  (unless (custom-theme-p theme)
+    (error "Unknown theme `%s'" theme)))

 
 ;;; Initializing.
 
 
 ;;; Initializing.
 

+(defun custom-push-theme (prop symbol theme mode value)
+  "Record a value for face or variable SYMBOL in custom theme THEME.
+PROP is`theme-face' for a face, `theme-value' for a variable.
+The value is specified by (THEME MODE VALUE), which is interpreted
+by `custom-theme-value'.
+
+MODE can be either the symbol `set' or the symbol `reset'.  If it is the
+symbol `set', then VALUE is the value to use.  If it is the symbol
+`reset', then VALUE is another theme, whose value for this face or
+variable should be used.
+
+In the following example for the variable `goto-address-url-face', the
+theme `subtle-hacker' uses the same value for the variable as the theme
+`gnome2':
+
+  \((standard set bold)
+   \(gnome2 set info-xref)
+   \(jonadab set underline)
+   \(subtle-hacker reset gnome2))
+
+
+If a value has been stored for themes A B and C, and a new value
+is to be stored for theme C, then the old value of C is discarded.
+If a new value is to be stored for theme B, however, the old value
+of B is not discarded because B is not the car of the list.
+
+For variables, list property PROP is `theme-value'.
+For faces, list property PROP is `theme-face'.
+This is used in `custom-do-theme-reset', for example.
+
+The list looks the same in any case; the examples shows a possible
+value of the `theme-face' property for the face `region':
+
+  \((gnome2 set ((t (:foreground \"cyan\" :background \"dark cyan\"))))
+   \(standard set ((((class color) (background dark))
+                  \(:background \"blue\"))
+                 \(t (:background \"gray\")))))
+
+This records values for the `standard' and the `gnome2' themes.
+The user has not customized the face; had he done that,
+the list would contain an entry for the `user' theme, too.
+See `custom-known-themes' for a list of known themes."
+  (let* ((old (get symbol prop))
+        (setting (assq theme old)))
+    ;; Alter an existing theme-setting for the symbol,
+    ;; or add a new one.
+    (if setting
+       (progn
+         (setcar (cdr setting) mode)
+         (setcar (cddr setting) value))
+      (put symbol prop (cons (list theme mode value) old)))
+    ;; Record, for each theme, all its settings.
+    (put theme 'theme-settings
+        (cons (list prop symbol theme mode value)
+              (get theme 'theme-settings)))))
+\f

 (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,
 (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,


@@ -389,21 +664,79 @@ in every Customization buffer.")
 (put 'custom-local-buffer 'permanent-local t)
 
 (defun custom-set-variables (&rest args)
 (put 'custom-local-buffer 'permanent-local t)
 
 (defun custom-set-variables (&rest args)

-  "Initialize variables according to user preferences.
+  "Install user customizations of variable values specified in ARGS.
+These settings are registered as theme `user'.
+The arguments should each be a list of the form:

 
 

-The arguments should be a list where each entry has the form:
+  (SYMBOL EXP [NOW [REQUEST [COMMENT]]])

 
 

-  (SYMBOL VALUE [NOW [REQUEST [COMMENT]]])
+This stores EXP (without evaluating it) as the saved value for SYMBOL.
+If NOW is present and non-nil, then also evaluate EXP and set
+the default value for the SYMBOL to the value of EXP.

 
 

-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.
-REQUEST is a list of features we must require for SYMBOL.
+REQUEST is a list of features we must require in order to
+handle SYMBOL properly.

 COMMENT is a comment string about SYMBOL."
 COMMENT is a comment string about SYMBOL."

+  (apply 'custom-theme-set-variables 'user args))
+
+(defun custom-reevaluate-setting (symbol)
+  "Reset the value of SYMBOL by re-evaluating its saved or standard value.
+Use the :set function to do so.  This is useful for customizable options
+that are defined before their standard value can really be computed.
+E.g. dumped variables whose default depends on run-time information."
+  (funcall (or (get symbol 'custom-set) 'set-default)
+          symbol
+          (eval (car (or (get symbol 'saved-value) (get symbol 'standard-value))))))
+
+(defun custom-theme-set-variables (theme &rest args)
+  "Initialize variables for theme THEME according to settings in ARGS.
+Each of the arguments in ARGS should be a list of this form:
+
+  (SYMBOL EXP [NOW [REQUEST [COMMENT]]])
+
+This stores EXP (without evaluating it) as the saved value for SYMBOL.
+If NOW is present and non-nil, then also evaluate EXP and set
+the default value for the SYMBOL to the value of EXP.
+
+REQUEST is a list of features we must require in order to
+handle SYMBOL properly.
+COMMENT is a comment string about SYMBOL.
+
+Several properties of THEME and SYMBOL are used in the process:
+
+If THEME's property `theme-immediate' is non-nil, this is equivalent of
+providing the NOW argument to all symbols in the argument list:
+evaluate each EXP and set the corresponding SYMBOL.  However,
+there's a difference in the handling of SYMBOL's property
+`force-value': if NOW is non-nil, SYMBOL's property `force-value' is set to
+the symbol `rogue', else if THEME's property `theme-immediate' is non-nil,
+SYMBOL's property `force-value' is set to the symbol `immediate'.
+
+EXP itself is saved unevaluated as SYMBOL property `saved-value' and
+in SYMBOL's list property `theme-value' \(using `custom-push-theme')."
+  (custom-check-theme theme)
+  (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)
+                       ;; Put minor modes and symbols with :require last.
+                       ;; Putting minor modes last ensures that the mode
+                       ;; function will see other customized values rather
+                       ;; than default values.
+                       (t (or (nth 3 a2)
+                               (eq (get sym2 'custom-set)
+                                   'custom-set-minor-mode))))))))

   (while args
     (let ((entry (car args)))
       (if (listp entry)
   (while args
     (let ((entry (car args)))
       (if (listp entry)

-         (let* ((symbol (nth 0 entry))
+         (let* ((symbol (indirect-variable (nth 0 entry)))

                 (value (nth 1 entry))
                 (now (nth 2 entry))
                 (requests (nth 3 entry))
                 (value (nth 1 entry))
                 (now (nth 2 entry))
                 (requests (nth 3 entry))


@@ -411,13 +744,14 @@ COMMENT is a comment string about SYMBOL."
                 set)
            (when requests
              (put symbol 'custom-requests requests)
                 set)
            (when requests
              (put symbol 'custom-requests requests)

-             (mapcar 'require requests))
+             (mapc 'require requests))

            (setq set (or (get symbol 'custom-set) 'custom-set-default))
            (put symbol 'saved-value (list value))
            (put symbol 'saved-variable-comment comment)
            (setq set (or (get symbol 'custom-set) 'custom-set-default))
            (put symbol 'saved-value (list value))
            (put symbol 'saved-variable-comment comment)

+           (custom-push-theme 'theme-value symbol theme 'set value)

            ;; Allow for errors in the case where the setter has
            ;; Allow for errors in the case where the setter has

-           ;; changed between versions, say.
-           (condition-case nil
+           ;; changed between versions, say, but let the user know.
+           (condition-case data

                (cond (now
                       ;; Rogue variable, set it now.
                       (put symbol 'force-value t)
                (cond (now
                       ;; Rogue variable, set it now.
                       (put symbol 'force-value t)


@@ -425,7 +759,8 @@ COMMENT is a comment string about SYMBOL."
                      ((default-boundp symbol)
                       ;; Something already set this, overwrite it.
                       (funcall set symbol (eval value))))
                      ((default-boundp symbol)
                       ;; Something already set this, overwrite it.
                       (funcall set symbol (eval value))))

-             (error nil))
+             (error
+              (message "Error setting %s: %s" symbol data)))

            (setq args (cdr args))
            (and (or now (default-boundp symbol))
                 (put symbol 'variable-comment comment)))
            (setq args (cdr args))
            (and (or now (default-boundp symbol))
                 (put symbol 'variable-comment comment)))


@@ -433,9 +768,10 @@ COMMENT is a comment string about SYMBOL."
        (message "Warning: old format `custom-set-variables'")
        (ding)
        (sit-for 2)
        (message "Warning: old format `custom-set-variables'")
        (ding)
        (sit-for 2)

-       (let ((symbol (nth 0 args))
+       (let ((symbol (indirect-variable (nth 0 args)))

              (value (nth 1 args)))
              (value (nth 1 args)))

-         (put symbol 'saved-value (list value)))
+         (put symbol 'saved-value (list value))
+         (custom-push-theme 'theme-value symbol theme 'set value))

        (setq args (cdr (cdr args)))))))
 
 (defun custom-set-default (variable value)
        (setq args (cdr (cdr args)))))))
 
 (defun custom-set-default (variable value)


@@ -448,6 +784,429 @@ this sets the local binding in that buffer instead."
        (set variable value))
     (set-default variable value)))
 
        (set variable value))
     (set-default variable value)))
 

+(defun custom-set-minor-mode (variable value)
+  ":set function for minor mode variables.
+Normally, this sets the default value of VARIABLE to nil if VALUE
+is nil and to t otherwise,
+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
+       (funcall variable (if value 1 0)))
+    (funcall variable (if value 1 0))))
+
+(defun custom-quote (sexp)
+  "Quote SEXP iff it is not self quoting."
+  (if (or (memq sexp '(t nil))
+         (keywordp sexp)
+         (and (listp sexp)
+              (memq (car sexp) '(lambda)))
+         (stringp sexp)
+         (numberp sexp)
+         (vectorp sexp)
+;;;      (and (fboundp 'characterp)
+;;;           (characterp sexp))
+         )
+      sexp
+    (list 'quote sexp)))
+
+(defun customize-mark-to-save (symbol)
+  "Mark SYMBOL for later saving.
+
+If the default value of SYMBOL is different from the standard value,
+set the `saved-value' property to a list whose car evaluates to the
+default value.  Otherwise, set it to nil.
+
+To actually save the value, call `custom-save-all'.
+
+Return non-nil iff the `saved-value' property actually changed."
+  (let* ((get (or (get symbol 'custom-get) 'default-value))
+        (value (funcall get symbol))
+        (saved (get symbol 'saved-value))
+        (standard (get symbol 'standard-value))
+        (comment (get symbol 'customized-variable-comment)))
+    ;; Save default value iff different from standard value.
+    (if (or (null standard)
+           (not (equal value (condition-case nil
+                                 (eval (car standard))
+                               (error nil)))))
+       (put symbol 'saved-value (list (custom-quote value)))
+      (put symbol 'saved-value nil))
+    ;; Clear customized information (set, but not saved).
+    (put symbol 'customized-value nil)
+    ;; Save any comment that might have been set.
+    (when comment
+      (put symbol 'saved-variable-comment comment))
+    (not (equal saved (get symbol 'saved-value)))))
+
+(defun customize-mark-as-set (symbol)
+  "Mark current value of SYMBOL as being set from customize.
+
+If the default value of SYMBOL is different from the saved value if any,
+or else if it is different from the standard value, set the
+`customized-value' property to a list whose car evaluates to the
+default value.  Otherwise, set it to nil.
+
+Return non-nil iff the `customized-value' property actually changed."
+  (let* ((get (or (get symbol 'custom-get) 'default-value))
+        (value (funcall get symbol))
+        (customized (get symbol 'customized-value))
+        (old (or (get symbol 'saved-value) (get symbol 'standard-value))))
+    ;; Mark default value as set iff different from old value.
+    (if (or (null old)
+           (not (equal value (condition-case nil
+                                 (eval (car old))
+                               (error nil)))))
+       (put symbol 'customized-value (list (custom-quote value)))
+      (put symbol 'customized-value nil))
+    ;; Changed?
+    (not (equal customized (get symbol 'customized-value)))))
+\f
+;;; Defining themes.
+
+;; deftheme is used at the beginning of the file that records a theme.
+
+(defmacro deftheme (theme &optional doc &rest args)
+  "Declare custom theme THEME.
+The optional argument DOC is a doc string describing the theme.
+The remaining arguments should have the form
+
+   [KEYWORD VALUE]...
+
+The following KEYWORD's are defined:
+
+:short-description
+       VALUE is a short (one line) description of the theme.  If not
+       given, DOC is used.
+:immediate
+       If VALUE is non-nil, variables specified in this theme are set
+       immediately when loading the theme.
+:variable-set-string
+       VALUE is a string used to indicate that a variable takes its
+       setting from this theme.  It is passed to FORMAT with the name
+       of the theme as an additional argument.  If not given, a
+       generic description is used.
+:variable-reset-string
+       VALUE is a string used in the case a variable has been forced
+       to its value in this theme.  It is passed to FORMAT with the
+       name of the theme as an additional argument.  If not given, a
+       generic description is used.
+:face-set-string
+       VALUE is a string used to indicate that a face takes its
+       setting from this theme.  It is passed to FORMAT with the name
+       of the theme as an additional argument.  If not given, a
+       generic description is used.
+:face-reset-string
+       VALUE is a string used in the case a face has been forced to
+       its value in this theme.  It is passed to FORMAT with the name
+       of the theme as an additional argument.  If not given, a
+       generic description is used.
+
+Any theme `foo' should be defined in a file called `foo-theme.el';
+see `custom-make-theme-feature' for more information."
+  (let ((feature (custom-make-theme-feature theme)))
+    ;; 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-theme
+                (list 'quote theme)
+                (list 'quote feature)
+                doc)
+          args)))
+
+(defun custom-declare-theme (theme feature &optional doc &rest args)
+  "Like `deftheme', but THEME is evaluated as a normal argument.
+FEATURE is the feature this theme provides.  This symbol is created
+from THEME by `custom-make-theme-feature'."
+  (add-to-list 'custom-known-themes theme)
+  (put theme 'theme-feature feature)
+  (when doc
+    (put theme 'theme-documentation doc))
+  (while args
+    (let ((arg (car args)))
+      (setq args (cdr args))
+      (unless (symbolp arg)
+       (error "Junk in args %S" args))
+      (let ((keyword arg)
+           (value (car args)))
+       (unless args
+         (error "Keyword %s is missing an argument" keyword))
+       (setq args (cdr args))
+       (cond ((eq keyword :short-description)
+              (put theme 'theme-short-description value))
+             ((eq keyword :immediate)
+              (put theme 'theme-immediate value))
+             ((eq keyword :variable-set-string)
+              (put theme 'theme-variable-set-string value))
+             ((eq keyword :variable-reset-string)
+              (put theme 'theme-variable-reset-string value))
+             ((eq keyword :face-set-string)
+              (put theme 'theme-face-set-string value))
+             ((eq keyword :face-reset-string)
+              (put theme 'theme-face-reset-string value)))))))
+
+(defun custom-make-theme-feature (theme)
+  "Given a symbol THEME, create a new symbol by appending \"-theme\".
+Store this symbol in the `theme-feature' property of THEME.
+Calling `provide-theme' to provide THEME actually puts `THEME-theme'
+into `features'.
+
+This allows for a file-name convention for autoloading themes:
+Every theme X has a property `provide-theme' whose value is \"X-theme\".
+\(require-theme X) then attempts to load the file `X-theme.el'."
+  (intern (concat (symbol-name theme) "-theme")))
+\f
+;;; Loading themes.
+
+;; The variable and face settings of a theme are recorded in
+;; the `theme-settings' property of the theme name.
+;; This property's value is a list of elements, each of the form
+;; (PROP SYMBOL THEME MODE VALUE), where PROP is `theme-value' or `theme-face'
+;; and SYMBOL is the face or variable name.
+;; THEME is the theme name itself; that's redundant, but simplifies things.
+;; MODE is `set' or `reset'.
+;; If MODE is `set', then VALUE is an expression that specifies the
+;; theme's setting for SYMBOL.
+;; If MODE is `reset', then VALUE is another theme,
+;; and it means to use the value from that theme.
+
+;; Each variable has a `theme-value' property that describes all the
+;; settings of enabled themes that apply to it.
+;; Each face name has a `theme-face' property that describes all the
+;; settings of enabled themes that apply to it.
+;; The property value is a list of settings, each with the form
+;; (THEME MODE VALUE).  THEME, MODE and VALUE are as above.
+;; Each of these lists is ordered by decreasing theme precedence.
+;; Thus, the first element is always the one that is in effect.
+
+;; Disabling a theme removes its settings from the `theme-value' and
+;; `theme-face' properties, but the theme's own `theme-settings'
+;; property remains unchanged.
+
+;; Loading a theme implicitly enables it.  Enabling a theme adds its
+;; settings to the symbols' `theme-value' and `theme-face' properties,
+;; or moves them to the front of those lists if they're already present.
+
+(defvar custom-loaded-themes nil
+  "Custom themes that have been loaded.")
+
+(defcustom custom-theme-directory
+  (if (eq system-type 'ms-dos)
+        ;; MS-DOS cannot have initial dot.
+        "~/_emacs.d/"
+      "~/.emacs.d/")
+  "Directory in which Custom theme files should be written.
+`require-theme' searches this directory in addition to load-path.
+The command `customize-create-theme' writes the files it produces
+into this directory."
+  :type 'string
+  :group 'customize
+  :version "22.1")
+
+(defun custom-theme-loaded-p (theme)
+  "Return non-nil if THEME has been loaded."
+  (memq theme custom-loaded-themes))
+
+(defvar custom-enabled-themes '(user)
+  "Custom themes currently enabled, highest precedence first.
+The first one is always `user'.")
+
+(defun custom-theme-enabled-p (theme)
+  "Return non-nil if THEME is enabled."
+  (memq theme custom-enabled-themes))
+
+(defun provide-theme (theme)
+  "Indicate that this file provides THEME.
+Add THEME to `custom-loaded-themes', and `provide' whatever
+feature name is stored in THEME's property `theme-feature'.
+
+Usually the `theme-feature' property contains a symbol created
+by `custom-make-theme-feature'."
+  (custom-check-theme theme)
+  (provide (get theme 'theme-feature))
+  (push theme custom-loaded-themes)
+  ;; Loading a theme also installs its settings,
+  ;; so mark it as "enabled".
+  (push theme custom-enabled-themes)
+  ;; `user' must always be the highest-precedence enabled theme.
+  ;; Make that remain true.  (This has the effect of making user settings
+  ;; override the ones just loaded, too.)
+  (custom-enable-theme 'user))
+
+(defun require-theme (theme)
+  "Try to load a theme's settings from its file.
+This also enables the theme; use `custom-disable-theme' to disable it."
+
+  ;; THEME's feature is stored in THEME's `theme-feature' property.
+  ;; Usually the `theme-feature' property contains a symbol created
+  ;; by `custom-make-theme-feature'.
+
+  ;; Note we do no check for validity of the theme here.
+  ;; This allows to pull in themes by a file-name convention
+  (let ((load-path (if (file-directory-p custom-theme-directory)
+                      (cons custom-theme-directory load-path)
+                    load-path)))
+    (require (or (get theme 'theme-feature)
+                (custom-make-theme-feature theme)))))
+\f
+;;; How to load and enable various themes as part of `user'.
+
+(defun custom-theme-load-themes (by-theme &rest body)
+  "Load the themes specified by BODY.
+Record them as required by theme BY-THEME.
+
+BODY is a sequence of either
+
+THEME
+        Load THEME and enable it.
+\(reset THEME)
+       Undo all the settings made by THEME
+\(hidden THEME)
+       Load THEME but do not enable it.
+
+All the themes loaded for BY-THEME are recorded in BY-THEME's property
+`theme-loads-themes'."
+  (custom-check-theme by-theme)
+  (let ((themes-loaded (get by-theme 'theme-loads-themes)))
+    (dolist (theme body)
+      (cond ((and (consp theme) (eq (car theme) 'reset))
+            (custom-disable-theme (cadr theme)))
+           ((and (consp theme) (eq (car theme) 'hidden))
+            (require-theme (cadr theme))
+            (custom-disable-theme (cadr theme)))
+           (t
+            (require-theme theme)))
+      (push theme themes-loaded))
+    (put by-theme 'theme-loads-themes themes-loaded)))
+
+(defun custom-load-themes (&rest body)
+  "Load themes for the USER theme as specified by BODY.
+
+See `custom-theme-load-themes' for more information on BODY."
+  (apply 'custom-theme-load-themes 'user body))
+\f
+;;; Enabling and disabling loaded themes.
+
+(defun custom-enable-theme (theme)
+  "Reenable all variable and face settings defined by THEME.
+The newly enabled theme gets the highest precedence (after `user').
+If it is already enabled, just give it highest precedence (after `user')."
+  (let ((settings (get theme 'theme-settings)))
+    (dolist (s settings)
+      (let* ((prop (car s))
+            (symbol (cadr s))
+            (spec-list (get symbol prop)))
+       (put symbol prop (cons (cddr s) (assq-delete-all theme spec-list)))
+       (if (eq prop 'theme-value)
+           (custom-theme-recalc-variable symbol)
+         (custom-theme-recalc-face symbol)))))
+  (setq custom-enabled-themes
+        (cons theme (delq theme custom-enabled-themes)))
+  ;; `user' must always be the highest-precedence enabled theme.
+  (unless (eq theme 'user)
+    (custom-enable-theme 'user)))
+
+(defun custom-disable-theme (theme)
+  "Disable all variable and face settings defined by THEME.
+See `custom-known-themes' for a list of known themes."
+  (let ((settings (get theme 'theme-settings)))
+    (dolist (s settings)
+      (let* ((prop (car s))
+            (symbol (cadr s))
+            (spec-list (get symbol prop)))
+       (put symbol 'theme-value (assq-delete-all theme spec-list))
+       (if (eq prop 'theme-value)
+           (custom-theme-recalc-variable symbol)
+         (custom-theme-recalc-face symbol)))))
+  (setq custom-enabled-themes
+       (delq theme custom-enabled-themes)))
+
+(defun custom-theme-value (theme setting-list)
+  "Determine the value specified for THEME according to SETTING-LIST.
+Returns a list whose car is the specified value, if we
+find one; nil otherwise.
+
+SETTING-LIST is an alist with themes as its key.
+Each element has the form:
+
+  \(THEME MODE VALUE)
+
+MODE is either the symbol `set' or the symbol `reset'.  See
+`custom-push-theme' for more information on the format of
+SETTING-LIST."
+  ;; Note we do _NOT_ signal an error if the theme is unknown
+  ;; it might have gone away without the user knowing.
+  (let ((elt (cdr (assoc theme setting-list))))
+    (if elt
+        (if (eq (car elt) 'set)
+            (cdr elt)
+         ;; `reset' means refer to another theme's value in the same alist.
+          (custom-theme-value (cadr elt) setting-list)))))
+
+(defun custom-variable-theme-value (variable)
+  "Return (list VALUE) indicating the custom theme value of VARIABLE.
+That is to say, it specifies what the value should be according to
+currently enabled custom themes.
+
+This function returns nil if no custom theme specifies a value for VARIABLE."
+  (let* ((theme-value (get variable 'theme-value)))
+    (if theme-value
+       (custom-theme-value (car (car theme-value)) theme-value))))
+
+(defun custom-face-theme-value (face)
+  "Return the face spec of FACE according to currently enabled custom themes.
+This function returns nil if no custom theme specifies anything for FACE."
+  (let* ((theme-value (get face 'theme-face)))
+    (if theme-value
+       (custom-theme-value (car (car theme-value)) theme-value))))
+
+(defun custom-theme-recalc-variable (variable)
+  "Set VARIABLE according to currently enabled custom themes."
+  (let ((valspec (custom-variable-theme-value variable)))
+    (when valspec
+      (put variable 'saved-value valspec))
+    (unless valspec
+      (setq valspec (get variable 'standard-value)))
+    (when valspec
+      (if (or (get 'force-value variable) (default-boundp variable))
+          (funcall (or (get variable 'custom-set) 'set-default) variable
+                   (eval (car valspec)))))))
+
+(defun custom-theme-recalc-face (face)
+  "Set FACE according to currently enabled custom themes."
+  (let ((spec (custom-face-theme-value face)))
+    (when spec
+      (put face 'save-face spec))
+    (unless spec
+      (setq spec (get face 'face-defface-spec)))
+    (when spec
+      (when (or (get face 'force-face) (facep face))
+       (unless (facep face)
+         (make-empty-face face))
+       (face-spec-set face spec)))))
+\f
+(defun custom-theme-reset-variables (theme &rest args)
+  "Reset the specs in THEME of some variables to their values in other themes.
+Each of the arguments ARGS has this form:
+
+    (VARIABLE FROM-THEME)
+
+This means reset VARIABLE to its value in FROM-THEME."
+  (custom-check-theme theme)
+  (dolist (arg args)
+    (custom-push-theme 'theme-value (car arg) theme 'reset (cadr arg))))
+
+(defun custom-reset-variables (&rest args)
+  "Reset the specs of some variables to their values in certain themes.
+This creates settings in the `user' theme.
+
+Each of the arguments ARGS has this form:
+
+    (VARIABLE FROM-THEME)
+
+This means reset VARIABLE to its value in FROM-THEME."
+    (apply 'custom-theme-reset-variables 'user args))
+

 ;;; The End.
 
 ;; Process the defcustoms for variables loaded before this file.
 ;;; The End.
 
 ;; Process the defcustoms for variables loaded before this file.


@@ -457,4 +1216,5 @@ this sets the local binding in that buffer instead."
 
 (provide 'custom)
 
 
 (provide 'custom)
 

+;; arch-tag: 041b6116-aabe-4f9a-902d-74092bc3dab2

 ;;; custom.el ends here
 ;;; custom.el ends here