;;; custom.el --- tools for declaring and initializing options
;;
-;; Copyright (C) 1996, 1997, 1999, 2001, 2002 Free Software Foundation, Inc.
+;; Copyright (C) 1996, 1997, 1999, 2001, 2002, 2004
+;; Free Software Foundation, Inc.
;;
;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
;; Maintainer: FSF
"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)
(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 value in the standard theme. See
+`custom-known-themes' for a list of known themes. For backwards
+compatibility, DEFAULT is also stored 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."
+ ;; Remember the standard setting. The value should be in the standard
+ ;; theme, not in this property. However, his would require changeing
+ ;; the C source of defvar and others as well...
(put symbol 'standard-value (list default))
;; Maybe this option was rogue in an earlier version. It no longer is.
(when (get symbol 'force-value)
((eq keyword :get)
(put symbol 'custom-get value))
((eq keyword :require)
- (setq requests (cons value requests)))
+ (push value requests))
((eq keyword :type)
(put symbol 'custom-type (purecopy value)))
((eq keyword :options)
;; Slow safe code to avoid duplicates.
(mapc (lambda (option)
(custom-add-option symbol option))
- value)
+ value)
;; Fast code for the common case.
(put symbol 'custom-options (copy-sequence value))))
(t
;; Do the actual initialization.
(unless custom-dont-initialize
(funcall initialize symbol default)))
- (setq current-load-list (cons symbol current-load-list))
+ (push (cons 'defvar symbol) current-load-list)
(run-hooks 'custom-define-hook)
symbol)
"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
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
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 VARIABLE
- Specifies that SYMBOL should be set after VARIABLE when
- both have been customized.
+: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."
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.
`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'.
`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,
(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.
(unless (member 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."
+ (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.
"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.
((equal load "cus-edit"))
(t (condition-case nil (load load) (error nil))))))))
+(defvar custom-known-themes '(user standard)
+ "Themes that have been define 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 the settings the user customized and saved.
+Additional themes declared with the `deftheme' macro will be added to
+the front of this list.")
+
+(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)))))))
+
+(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-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")))
+
+(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.
+(defun custom-push-theme (prop symbol theme mode value)
+ "Add (THEME MODE VALUE) to the list in property PROP of SYMBOL.
+If the first element in that list is already (THEME ...),
+discard it first.
+
+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 the mode to query instead.
+
+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)))
+ (if (eq (car-safe (car-safe old)) theme)
+ (setq old (cdr old)))
+ (put symbol prop (cons (list theme mode value) old))))
+
(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,
(defun custom-set-variables (&rest args)
"Initialize variables according to user preferences.
+The settings are registered as theme `user'.
+The arguments should each be a list of the form:
+
+ (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 default value for the SYMBOL.
+
+REQUEST is a list of features we must 'require for SYMBOL.
+COMMENT is a comment string about SYMBOL."
+ (apply 'custom-theme-set-variables 'user args))
+
+(defun custom-theme-set-variables (theme &rest args)
+ "Initialize variables according to settings specified by args.
+Records the settings as belonging to THEME.
The arguments should be a list where each entry has the form:
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.
-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))
- (1-then-2 t)
- (2-then-1 nil)
- ;; Put symbols with :require last. The macro
- ;; define-minor-mode generates a defcustom
- ;; with a :require and a :set, where the
- ;; setter function calls the mode function.
- ;; Putting symbols with :require last ensures
- ;; that the mode function will see other
- ;; customized values rather than default
- ;; values.
- (t (nth 3 a2)))))))
- (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))
- (comment (nth 4 entry))
- set)
- (when requests
- (put symbol 'custom-requests 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)
- ;; Allow for errors in the case where the setter has
+REQUEST is a list of features we must 'require for SYMBOL.
+COMMENT is a comment string about SYMBOL.
+
+Several properties of THEME and SYMBOL are used in the process:
+
+If THEME property `theme-immediate' is non-nil, this is equivalent of
+providing the NOW argument to all symbols in the argument list: SYMBOL
+is bound to the evaluated VALUE. The only difference is SYMBOL 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,
+FACE's property `force-face' is set to the symbol `immediate'.
+
+VALUE 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)
+ (let ((immediate (get theme 'theme-immediate)))
+ (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 symbols with :require last. The macro
+ ;; define-minor-mode generates a defcustom
+ ;; with a :require and a :set, where the
+ ;; setter function calls the mode function.
+ ;; Putting symbols with :require last ensures
+ ;; that the mode function will see other
+ ;; customized values rather than default
+ ;; values.
+ (t (nth 3 a2)))))))
+ (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))
+ (comment (nth 4 entry))
+ set)
+ (when requests
+ (put symbol 'custom-requests 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)
+ (custom-push-theme 'theme-value symbol theme 'set value)
+ ;; Allow for errors in the case where the setter has
;; changed between versions, say, but let the user know.
(condition-case data
(cond (now
((default-boundp symbol)
;; Something already set this, overwrite it.
(funcall set symbol (eval value))))
- (error
+ (error
(message "Error setting %s: %s" symbol data)))
- (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)
- (sit-for 2)
- (let ((symbol (nth 0 args))
- (value (nth 1 args)))
- (put symbol 'saved-value (list value)))
- (setq args (cdr (cdr args)))))))
+ (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)
+ (sit-for 2)
+ (let ((symbol (nth 0 args))
+ (value (nth 1 args)))
+ (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)
"Default :set function for a customizable variable.
(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 (or value 0)))
+ (funcall variable (or value 0))))
+
(defun custom-quote (sexp)
"Quote SEXP iff it is not self quoting."
(if (or (memq sexp '(t nil))
(defun customize-mark-to-save (symbol)
"Mark SYMBOL for later saving.
-If the default value of SYMBOL is different from the standard value,
+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 til nil.
+default value. Otherwise, set it to nil.
To actually save the value, call `custom-save-all'.
(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,
+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 til nil.
+`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))
(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
+ (not (equal value (condition-case nil
(eval (car old))
(error nil)))))
(put symbol 'customized-value (list (custom-quote value)))
;; Changed?
(not (equal customized (get symbol 'customized-value)))))
+;;; Theme Manipulation
+
+(defvar custom-loaded-themes nil
+ "Themes in the order they are loaded.")
+
+(defun custom-theme-loaded-p (theme)
+ "Return non-nil when THEME has been loaded."
+ (memq theme custom-loaded-themes))
+
+(defun provide-theme (theme)
+ "Indicate that this file provides THEME.
+Add THEME to `custom-loaded-themes' and `provide' whatever
+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))
+ (setq custom-loaded-themes (nconc (list theme) custom-loaded-themes)))
+
+(defun require-theme (theme)
+ "Try to load a theme by requiring its feature.
+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
+ (require (or (get theme 'theme-feature)
+ (custom-make-theme-feature theme))))
+
+(defun custom-remove-theme (spec-alist theme)
+ "Delete all elements from SPEC-ALIST whose car is THEME."
+ (let ((elt (assoc theme spec-alist)))
+ (while elt
+ (setq spec-alist (delete elt spec-alist)
+ elt (assoc theme spec-alist))))
+ spec-alist)
+
+(defun custom-do-theme-reset (theme)
+ "Undo all settings defined by THEME.
+
+A variable remains unchanged if its property `theme-value' does not
+contain a value for THEME. A face remains unchanged if its property
+`theme-face' does not contain a value for THEME. In either case, all
+settings for THEME are removed from the property and the variable or
+face is set to the `user' theme.
+
+See `custom-known-themes' for a list of known themes."
+ (let (spec-list)
+ (mapatoms (lambda (symbol)
+ ;; This works even if symbol is both a variable and a
+ ;; face.
+ (setq spec-list (get symbol 'theme-value))
+ (when spec-list
+ (put symbol 'theme-value (custom-remove-theme spec-list theme))
+ (custom-theme-reset-internal symbol 'user))
+ (setq spec-list (get symbol 'theme-face))
+ (when spec-list
+ (put symbol 'theme-face (custom-remove-theme spec-list theme))
+ (custom-theme-reset-internal-face symbol '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
+ BY-THEME requires THEME
+\(reset THEME)
+ Undo all the settings made by THEME
+\(hidden THEME)
+ Require THEME but hide it from the user
+
+All the themes loaded for BY-THEME are recorded in BY-THEME's property
+`theme-loads-themes'. Any theme loaded with the hidden predicate will
+be given the property `theme-hidden' unless it has been loaded before.
+Whether a theme has been loaded before is determined by the function
+`custom-theme-loaded-p'."
+ (custom-check-theme by-theme)
+ (let ((theme)
+ (themes-loaded (get by-theme 'theme-loads-themes)))
+ (while theme
+ (setq theme (car body)
+ body (cdr body))
+ (cond ((and (consp theme) (eq (car theme) 'reset))
+ (custom-do-theme-reset (cadr theme)))
+ ((and (consp theme) (eq (car theme) 'hidden))
+ (require-theme (cadr theme))
+ (unless (custom-theme-loaded-p (cadr theme))
+ (put (cadr theme) 'theme-hidden t)))
+ (t
+ (require-theme theme)
+ (put theme 'theme-hidden nil)))
+ (setq themes-loaded (nconc (list 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))
+
+; (defsubst copy-upto-last (elt list)
+; "Copy all the elements of the list upto the last occurence of elt"
+; ;; Is it faster to do more work in C than to do less in elisp?
+; (nreverse (cdr (member elt (reverse list)))))
+
+(defun custom-theme-value (theme theme-spec-list)
+ "Determine the value for THEME defined by THEME-SPEC-LIST.
+Returns a list with the original value if found; nil otherwise.
+
+THEME-SPEC-LIST is an alist with themes as its key. As new themes are
+installed, these are added to the front of THEME-SPEC-LIST.
+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
+THEME-SPEC-LIST."
+ ;; Note we do _NOT_ signal an error if the theme is unknown
+ ;; it might have gone away without the user knowing.
+ (let ((value (cdr (assoc theme theme-spec-list))))
+ (if value
+ (if (eq (car value) 'set)
+ (cdr value)
+ (custom-theme-value (cadr value) theme-spec-list)))))
+
+(defun custom-theme-variable-value (variable theme)
+ "Return (list value) indicating value of VARIABLE in THEME.
+If THEME does not define a value for VARIABLE, return nil. The value
+definitions per theme are stored in VARIABLE's property `theme-value'.
+The actual work is done by function `custom-theme-value', which see.
+See `custom-push-theme' for more information on how these definitions
+are stored."
+ (custom-theme-value theme (get variable 'theme-value)))
+
+(defun custom-theme-reset-internal (symbol to-theme)
+ "Reset SYMBOL to the value defined by TO-THEME.
+If SYMBOL is not defined in TO-THEME, reset SYMBOL to the standard
+value. See `custom-theme-variable-value'. The standard value is
+stored in SYMBOL's property `standard-value'."
+ (let ((value (custom-theme-variable-value symbol to-theme))
+ was-in-theme)
+ (setq was-in-theme value)
+ (setq value (or value (get symbol 'standard-value)))
+ (when value
+ (put symbol 'saved-value was-in-theme)
+ (if (or (get 'force-value symbol) (default-boundp symbol))
+ (funcall (or (get symbol 'custom-set) 'set-default) symbol
+ (eval (car value)))))
+ value))
+
+(defun custom-theme-reset-variables (theme &rest args)
+ "Reset the value of the variables to values previously defined.
+Associate this setting with THEME.
+
+ARGS is a list of lists of the form
+
+ (VARIABLE TO-THEME)
+
+This means reset VARIABLE to its value in TO-THEME."
+ (custom-check-theme theme)
+ (mapcar '(lambda (arg)
+ (apply 'custom-theme-reset-internal arg)
+ (custom-push-theme 'theme-value (car arg) theme 'reset (cadr arg)))
+ args))
+
+(defun custom-reset-variables (&rest args)
+ "Reset the value of the variables to values previously saved.
+This is the setting associated the `user' theme.
+
+ARGS is a list of lists of the form
+
+ (VARIABLE TO-THEME)
+
+This means reset VARIABLE to its value in TO-THEME."
+ (apply 'custom-theme-reset-variables 'user args))
+
;;; The End.
;; Process the defcustoms for variables loaded before this file.
(provide 'custom)
+;;; arch-tag: 041b6116-aabe-4f9a-902d-74092bc3dab2
;;; custom.el ends here