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custom.el
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custom.el
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;;; custom.el --- tools for declaring and initializing options
;;
;; Copyright (C) 1996-1997, 1999, 2001-2013 Free Software Foundation, Inc.
;;
;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
;; Maintainer: FSF
;; Keywords: help, faces
;; Package: emacs
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; 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.
;; The code implementing face declarations is in `cus-face.el'.
;;; Code:
(require 'widget)
(defvar custom-define-hook nil
;; 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 exp)
"Initialize SYMBOL with EXP.
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 use it as the default binding for symbol.
Otherwise, EXP will be evaluated and used as the default binding for
symbol."
(eval `(defvar ,symbol ,(let ((sv (get symbol 'saved-value)))
(if sv (car sv) exp)))))
(defun custom-initialize-set (symbol exp)
"Initialize SYMBOL based on EXP.
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 the value of EXP."
(condition-case nil
(default-toplevel-value symbol)
(error
(funcall (or (get symbol 'custom-set) #'set-default-toplevel-value)
symbol
(eval (let ((sv (get symbol 'saved-value)))
(if sv (car sv) exp)))))))
(defun custom-initialize-reset (symbol exp)
"Initialize SYMBOL based on EXP.
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) the value of EXP."
(funcall (or (get symbol 'custom-set) #'set-default-toplevel-value)
symbol
(condition-case nil
(let ((def (default-toplevel-value symbol))
(getter (get symbol 'custom-get)))
(if getter (funcall getter symbol) def))
(error
(eval (let ((sv (get symbol 'saved-value)))
(if sv (car sv) exp)))))))
(defun custom-initialize-changed (symbol exp)
"Initialize SYMBOL with EXP.
Like `custom-initialize-reset', but only use the `:set' function if
not using the standard setting.
For the standard setting, use `set-default'."
(condition-case nil
(let ((def (default-toplevel-value symbol)))
(funcall (or (get symbol 'custom-set) #'set-default-toplevel-value)
symbol
(let ((getter (get symbol 'custom-get)))
(if getter (funcall getter symbol) def))))
(error
(cond
((get symbol 'saved-value)
(funcall (or (get symbol 'custom-set) #'set-default-toplevel-value)
symbol
(eval (car (get symbol 'saved-value)))))
(t
(set-default symbol (eval exp)))))))
(defvar custom-delayed-init-variables nil
"List of variables whose initialization is pending.")
(defun custom-initialize-delay (symbol _value)
"Delay initialization of SYMBOL to the next Emacs start.
This is used in files that are preloaded (or for autoloaded
variables), so that the initialization is done in the run-time
context rather than the build-time context. This also has the
side-effect that the (delayed) initialization is performed with
the :set function.
For variables in preloaded files, you can simply use this
function for the :initialize property. For autoloaded variables,
you will also need to add an autoload stanza calling this
function, and another one setting the standard-value property.
Or you can wrap the defcustom in a progn, to force the autoloader
to include all of it." ; see eg vc-sccs-search-project-dir
;; No longer true:
;; "See `send-mail-function' in sendmail.el for an example."
;; Until the var is actually initialized, it is kept unbound.
;; This seemed to be at least as good as setting it to an arbitrary
;; value like nil (evaluating `value' is not an option because it
;; may have undesirable side-effects).
(push symbol custom-delayed-init-variables))
(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.
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 (purecopy (list default)))
;; Maybe this option was rogue in an earlier version. It no longer is.
(when (get symbol 'force-value)
(put symbol 'force-value nil))
(if (keywordp doc)
(error "Doc string is missing"))
(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))
(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 :initialize)
(setq initialize value))
((eq keyword :set)
(put symbol 'custom-set value))
((eq keyword :get)
(put symbol 'custom-get value))
((eq keyword :require)
(push value requests))
((eq keyword :risky)
(put symbol 'risky-local-variable value))
((eq keyword :safe)
(put symbol 'safe-local-variable value))
((eq keyword :type)
(put symbol 'custom-type (purecopy value)))
((eq keyword :options)
(if (get symbol 'custom-options)
;; Slow safe code to avoid duplicates.
(mapc (lambda (option)
(custom-add-option symbol option))
value)
;; Fast code for the common case.
(put symbol 'custom-options (copy-sequence value))))
(t
(custom-handle-keyword symbol keyword value
'custom-variable))))))
(put symbol 'custom-requests requests)
;; Do the actual initialization.
(unless custom-dont-initialize
(funcall initialize symbol default)))
;; Use defvar to set the docstring as well as the special-variable-p flag.
;; FIXME: We should reproduce more of `defvar's behavior, such as the warning
;; when the var is currently let-bound.
(if (not (default-boundp symbol))
;; Don't use defvar to avoid setting a default-value when undesired.
(when doc (put symbol 'variable-documentation doc))
(eval `(defvar ,symbol nil ,@(when doc (list doc)))))
(push symbol current-load-list)
(run-hooks 'custom-define-hook)
symbol)
(defmacro defcustom (symbol standard doc &rest args)
"Declare SYMBOL as a customizable variable.
SYMBOL is the variable name; it should not be quoted.
STANDARD is an expression specifying the variable's standard
value. It should not be quoted. It is evaluated once by
`defcustom', and the value is assigned to SYMBOL if the variable
is unbound. The expression itself is also stored, so that
Customize can re-evaluate it later to get the standard value.
DOC is the variable documentation.
This macro uses `defvar' as a subroutine, which also marks the
variable as \"special\", so that it is always dynamically bound
even when `lexical-binding' is t.
The remaining arguments to `defcustom' should have the form
[KEYWORD VALUE]...
The following keywords are meaningful:
: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.
: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-reset'.
:set VALUE should be a function to set the value of the symbol
when using the Customize user interface.
It takes two arguments, the symbol to set and the value to
give it. The default choice of function is `set-default'.
:get VALUE should be a function to extract the value of symbol.
The function takes one argument, a symbol, and should return
the current value for that symbol. The default choice of function
is `default-value'.
:require
VALUE should be a feature symbol. If you save a value
for this option, then when your init file loads the value,
it does (require VALUE) first.
:set-after VARIABLES
Specifies that SYMBOL should be set after the list of variables
VARIABLES when both have been customized.
:risky Set SYMBOL's `risky-local-variable' property to VALUE.
:safe Set SYMBOL's `safe-local-variable' property to VALUE.
See Info node `(elisp) File Local Variables'.
The following common keywords are also meaningful.
:group VALUE should be a customization group.
Add SYMBOL (or FACE with `defface') 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 several 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\".
(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.
(emacs-commentary-link LIBRARY)
Link to the commentary section of LIBRARY.
(emacs-library-link LIBRARY)
Link to an Emacs Lisp LIBRARY file.
(file-link FILE)
Link to FILE.
(function-link FUNCTION)
Link to the documentation of FUNCTION.
(variable-link VARIABLE)
Link to the documentation of VARIABLE.
(custom-group-link GROUP)
Link to another customization GROUP.
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.
:version
VALUE should be a string specifying that the variable was
first introduced, or its default value was changed, in Emacs
version VERSION.
:package-version
VALUE should be a list with the form (PACKAGE . VERSION)
specifying that the variable was first introduced, or its
default value was changed, in PACKAGE version VERSION. This
keyword takes priority over :version. The PACKAGE and VERSION
must appear in the alist `customize-package-emacs-version-alist'.
Since PACKAGE must be unique and the user might see it in an
error message, a good choice is the official name of the
package, such as MH-E or Gnus.
: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.
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.)
See Info node `(elisp) Customization' in the Emacs Lisp manual
for more information."
(declare (doc-string 3) (debug (name body)))
;; 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.
`(custom-declare-variable
',symbol
,(if lexical-binding ;FIXME: This is not reliable, but is all we have.
;; The STANDARD arg should be an expression that evaluates to
;; the standard value. The use of `eval' for it is spread
;; over many different places and hence difficult to
;; eliminate, yet we want to make sure that the `standard'
;; expression is checked by the byte-compiler, and that
;; lexical-binding is obeyed, so quote the expression with
;; `lambda' rather than with `quote'.
``(funcall #',(lambda () ,standard))
`',standard)
,doc
,@args))
;;; The `defface' Macro.
(defmacro defface (face spec doc &rest args)
"Declare FACE as a customizable face that defaults to SPEC.
FACE does not need to be quoted.
Third argument DOC is the face documentation.
If FACE has been set with `custom-theme-set-faces', set the face
attributes as specified by that function, otherwise set the face
attributes according to SPEC.
The remaining arguments should have the form [KEYWORD VALUE]...
For a list of valid keywords, see the common keywords listed in
`defcustom'.
SPEC should be a \"face spec\", i.e., an alist of the form
((DISPLAY . ATTS)...)
where DISPLAY is a form specifying conditions to match certain
terminals and ATTS is a property list (ATTR VALUE ATTR VALUE...)
specifying face attributes and values for frames on those
terminals. On each terminal, the first element with a matching
DISPLAY specification takes effect, and the remaining elements in
SPEC are disregarded.
As a special exception, in the first element of SPEC, DISPLAY can
be the special value `default'. Then the ATTS in that element
act as defaults for all the following elements.
For backward compatibility, elements of SPEC can be written
as (DISPLAY ATTS) instead of (DISPLAY . ATTS).
Each DISPLAY can have the following values:
- `default' (only in the first element).
- The symbol t, which matches all terminals.
- An alist of conditions. Each alist element must have the form
(REQ ITEM...). A matching terminal must satisfy each
specified condition by matching one of its ITEMs. Each REQ
must be one of the following:
- `type' (the terminal type).
Each ITEM must be one of the values returned by
`window-system'. Under X, additional allowed values are
`motif', `lucid', `gtk' and `x-toolkit'.
- `class' (the terminal's color support).
Each ITEM should be one of `color', `grayscale', or `mono'.
- `background' (what color is used for the background text)
Each ITEM should be one of `light' or `dark'.
- `min-colors' (the minimum number of supported colors)
Each ITEM should be an integer, which is compared with the
result of `display-color-cells'.
- `supports' (match terminals supporting certain attributes).
Each ITEM should be a list of face attributes. See
`display-supports-face-attributes-p' for more information on
exactly how testing is done.
In the ATTS property list, possible attributes are `:family',
`:width', `:height', `:weight', `:slant', `:underline',
`:overline', `:strike-through', `:box', `:foreground',
`:background', `:stipple', `:inverse-video', and `:inherit'.
See Info node `(elisp) Faces' in the Emacs Lisp manual for more
information."
(declare (doc-string 3))
;; 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-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)))
(when doc
;; 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)
(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 :prefix)
(put symbol 'custom-prefix (purecopy value)))
(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 (purecopy load-file-name) symbol)
custom-current-group-alist)))
(run-hooks 'custom-define-hook)
symbol)
(defmacro defgroup (symbol members doc &rest args)
"Declare SYMBOL as a customization group containing MEMBERS.
SYMBOL does not need to be quoted.
Third argument DOC is the group documentation. This should be a short
description of the group, beginning with a capital and ending with
a period. Words other than the first should not be capitalized, if they
are not usually written so.
MEMBERS should be an alist of the form ((NAME WIDGET)...) where
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
[KEYWORD VALUE]...
For a list of valid keywords, see the common keywords listed in
`defcustom'.
See Info node `(elisp) Customization' in the Emacs Lisp manual
for more information."
(declare (doc-string 3))
;; 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.
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."
(unless (memq :group args)
(custom-add-to-group (custom-current-group) symbol type))
(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))
(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."
(if purify-flag
(setq value (purecopy value)))
(cond ((eq keyword :group)
(custom-add-to-group value symbol type))
((eq keyword :version)
(custom-add-version symbol value))
((eq keyword :package-version)
(custom-add-package-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 :set-after)
(custom-add-dependencies symbol value))
(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.
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)))))
(defalias 'custom-add-frequent-value 'custom-add-option)
(defun custom-add-link (symbol widget)
"To the custom option SYMBOL add the link WIDGET."
(let ((links (get symbol 'custom-links)))
(unless (member 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-package-version (symbol version)
"To the custom option SYMBOL add the package version VERSION."
(put symbol 'custom-package-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)
(put symbol 'custom-loads (cons (purecopy load) loads)))))
(defun custom-autoload (symbol load &optional noset)
"Mark SYMBOL as autoloaded custom variable and add dependency LOAD.
If NOSET is non-nil, don't bother autoloading LOAD when setting the variable."
(put symbol 'custom-autoload (if noset 'noset t))
(custom-add-load symbol load))
(defun custom-variable-p (variable)
"Return non-nil if VARIABLE is a customizable variable.
A customizable variable is either (i) a variable whose property
list contains a non-nil `standard-value' or `custom-autoload'
property, or (ii) an alias for another customizable variable."
(when (symbolp variable)
(setq variable (indirect-variable variable))
(or (get variable 'standard-value)
(get variable 'custom-autoload))))
(define-obsolete-function-alias 'user-variable-p 'custom-variable-p "24.3")
(defun custom-note-var-changed (variable)
"Inform Custom that VARIABLE has been set (changed).
VARIABLE is a symbol that names a user option.
The result is that the change is treated as having been made through Custom."
(put variable 'customized-value (list (custom-quote (eval variable)))))
;;; Custom Themes
;;; 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-p 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))))))))
(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-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)))
(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 if 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 if the `saved-value' property actually changed."
(custom-load-symbol symbol)
(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 if 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 if the `customized-value' property actually changed."
(custom-load-symbol symbol)
(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 if different from old value.
(if (not (and old
(equal value (condition-case nil
(eval (car old))
(error nil)))))
(progn (put symbol 'customized-value (list (custom-quote value)))
(custom-push-theme 'theme-value symbol 'user 'set
(custom-quote value)))
(put symbol 'customized-value nil))
;; Changed?
(not (equal customized (get symbol 'customized-value)))))
(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))))))
;;; Custom Themes
;; Custom themes are collections of settings that can be enabled or
;; disabled as a unit.
;; Each Custom theme is defined by a symbol, called the theme name.
;; The `theme-settings' property of the theme name records the
;; variable and face settings of the theme. This property is a list
;; of elements, each of the form
;;
;; (PROP SYMBOL THEME VALUE)
;;
;; - PROP is either `theme-value' or `theme-face'
;; - SYMBOL is the face or variable name
;; - THEME is the theme name (redundant, but simplifies the code)
;; - VALUE is an expression that gives the theme's setting for SYMBOL.
;;
;; The theme name also has a `theme-feature' property, whose value is
;; specified when the theme is defined (see `custom-declare-theme').
;; Usually, this is just a symbol named THEME-theme. This lets
;; external libraries call (require 'foo-theme).
;; In addition, each symbol (either a variable or a face) affected by
;; an *enabled* theme has a `theme-value' or `theme-face' property,
;; which is a list of elements each of the form
;;
;; (THEME VALUE)
;;
;; which have the same meanings as in `theme-settings'.
;;
;; The `theme-value' and `theme-face' lists are ordered by decreasing
;; theme precedence. Thus, the first element is always the one that
;; is in effect.
;; Each theme is stored in a theme file, with filename THEME-theme.el.
;; Loading a theme basically involves calling (load "THEME-theme")
;; This is done by the function `load-theme'. Loading a theme
;; automatically enables it.
;;
;; When a theme is enabled, the `theme-value' and `theme-face'
;; properties for the affected symbols are set. When a theme is
;; disabled, its settings are removed from the `theme-value' and
;; `theme-face' properties, but the theme's own `theme-settings'
;; property remains unchanged.
(defvar custom-known-themes '(user changed)
"Themes that have been defined with `deftheme'.
The default value is the list (user changed). The theme `changed'
contains the settings before custom themes are applied. 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)))
(defun custom-push-theme (prop symbol theme mode &optional value)
"Record VALUE for face or variable SYMBOL in custom theme THEME.
PROP is `theme-face' for a face, `theme-value' for a variable.
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 SYMBOL will be removed from THEME (VALUE is ignored).
See `custom-known-themes' for a list of known themes."
(unless (memq prop '(theme-value theme-face))
(error "Unknown theme property"))
(let* ((old (get symbol prop))
(setting (assq theme old)) ; '(theme value)
(theme-settings ; '(prop symbol theme value)
(get theme 'theme-settings)))
(cond
;; Remove a setting:
((eq mode 'reset)
(when setting
(let (res)
(dolist (theme-setting theme-settings)
(if (and (eq (car theme-setting) prop)
(eq (cadr theme-setting) symbol))
(setq res theme-setting)))
(put theme 'theme-settings (delq res theme-settings)))
(put symbol prop (delq setting old))))
;; Alter an existing setting:
(setting
(let (res)
(dolist (theme-setting theme-settings)
(if (and (eq (car theme-setting) prop)
(eq (cadr theme-setting) symbol))
(setq res theme-setting)))
(put theme 'theme-settings
(cons (list prop symbol theme value)
(delq res theme-settings)))
(setcar (cdr setting) value)))
;; Add a new setting:
(t
(unless custom--inhibit-theme-enable
(unless old
;; If the user changed a variable outside of Customize, save
;; the value to a fake theme, `changed'. If the theme is
;; later disabled, we use this to bring back the old value.
;;
;; For faces, we just use `face-new-frame-defaults' to
;; recompute when the theme is disabled.
(when (and (eq prop 'theme-value)
(boundp symbol))
(let ((sv (get symbol 'standard-value))
(val (symbol-value symbol)))
(unless (and sv (equal (eval (car sv)) val))
(setq old `((changed ,(custom-quote val))))))))
(put symbol prop (cons (list theme value) old)))
(put theme 'theme-settings
(cons (list prop symbol theme value) theme-settings))))))
(defun custom-fix-face-spec (spec)
"Convert face SPEC, replacing obsolete :bold and :italic attributes.
Also change :reverse-video to :inverse-video."
(when (listp spec)
(if (or (memq :bold spec)
(memq :italic spec)
(memq :inverse-video spec))
(let (result)
(while spec
(let ((key (car spec))
(val (car (cdr spec))))
(cond ((eq key :italic)
(push :slant result)
(push (if val 'italic 'normal) result))
((eq key :bold)
(push :weight result)
(push (if val 'bold 'normal) result))
((eq key :reverse-video)
(push :inverse-video result)
(push val result))
(t
(push key result)
(push val result))))
(setq spec (cddr spec)))
(nreverse result))
spec)))
(defun custom-set-variables (&rest args)
"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:
(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."
(apply 'custom-theme-set-variables 'user args))
(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]]])
SYMBOL is the variable name, and EXP is an expression which
evaluates to the customized value. EXP will also be stored,
without evaluating it, in SYMBOL's `saved-value' property, so
that it can be restored via the Customize interface. It is also
added to the alist in SYMBOL's `theme-value' property (by
calling `custom-push-theme').
NOW, if present and non-nil, means to install the variable's
value directly now, even if its `defcustom' declaration has not
been executed. This is for internal use only.
REQUEST is a list of features to `require' (which are loaded
prior to evaluating EXP).
COMMENT is a comment string about SYMBOL."
(custom-check-theme theme)
;; Process all the needed autoloads before anything else, so that the
;; subsequent code has all the info it needs (e.g. which var corresponds
;; to a minor mode), regardless of the ordering of the variables.
(dolist (entry args)
(let* ((symbol (indirect-variable (nth 0 entry))))
(unless (or (get symbol 'standard-value)
(memq (get symbol 'custom-autoload) '(nil noset)))
;; This symbol needs to be autoloaded, even just for a `set'.
(custom-load-symbol symbol))))
(setq args (custom--sort-vars args))
(dolist (entry args)
(unless (listp entry)
(error "Incompatible Custom theme spec"))
(let* ((symbol (indirect-variable (nth 0 entry)))
(value (nth 1 entry)))
(custom-push-theme 'theme-value symbol theme 'set value)
(unless custom--inhibit-theme-enable
;; Now set the variable.
(let* ((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
;; changed between versions, say, but let the user know.
(condition-case data
(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
(message "Error setting %s: %s" symbol data)))
(and (or now (default-boundp symbol))
(put symbol 'variable-comment comment)))))))
(defvar custom--sort-vars-table)
(defvar custom--sort-vars-result)