@c -*-texinfo-*-
@c This is part of the GNU Emacs Lisp Reference Manual.
-@c Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
-@c 2005, 2006, 2007 Free Software Foundation, Inc.
+@c Copyright (C) 1997-2011 Free Software Foundation, Inc.
@c See the file elisp.texi for copying conditions.
@setfilename ../../info/customize
@node Customization, Loading, Macros, Top
Use @var{label}, a string, instead of the item's name, to label the
item in customization menus and buffers. @strong{Don't use a tag
which is substantially different from the item's real name; that would
-cause confusion.} One legitimate case for use of @code{:tag} is to
-specify a dash where normally a hyphen would be converted to a space:
-
-@example
-(defcustom cursor-in-non-selected-windows @dots{}
- :tag "Cursor In Non-selected Windows"
-@end example
+cause confusion.}
@kindex group@r{, customization keyword}
@item :group @var{group}
@item :load @var{file}
@kindex load@r{, customization keyword}
Load file @var{file} (a string) before displaying this customization
-item. Loading is done with @code{load-library}, and only if the file is
-not already loaded.
+item (@pxref{Loading}). Loading is done with @code{load}, and only if
+the file is not already loaded.
@item :require @var{feature}
@kindex require@r{, customization keyword}
Use @code{defcustom} to declare user-customizable variables.
@defmac defcustom option standard doc [keyword value]@dots{}
-This construct declares @var{option} as a customizable user option
-variable. You should not quote @var{option}. The argument @var{doc}
-specifies the documentation string for the variable. There is no need
-to start it with a @samp{*}, because @code{defcustom} automatically
-marks @var{option} as a @dfn{user option} (@pxref{Defining
-Variables}).
+This macro declares @var{option} as a customizable @dfn{user option}.
+You should not quote @var{option}.
+
+This causes the function @code{user-variable-p} to return @code{t}
+when given @var{option} as an argument. @xref{Defining Variables}.
+The argument @var{doc} specifies the documentation string for the
+variable. (Note that there is no need to start @var{doc} with a
+@samp{*}.)
The argument @var{standard} is an expression that specifies the
standard value for @var{option}. Evaluating the @code{defcustom} form
arranges to set the variable unconditionally, without testing whether
its value is void. (The same feature applies to @code{defvar}.)
@xref{Defining Variables}.
+
+If you put a @code{defcustom} in a file that is preloaded at dump time
+(@pxref{Building Emacs}), and the standard value installed for the
+variable at that time might not be correct, use
+@code{custom-reevaluate-setting}, described below, to re-evaluate the
+standard value during or after Emacs startup.
@end defmac
@code{defcustom} accepts the following additional keywords:
@item :risky @var{value}
@kindex risky@r{, @code{defcustom} keyword}
-Set this variable's @code{risky-local-variable} property to @var{value}.
+Set the variable's @code{risky-local-variable} property to
+@var{value} (@pxref{File Local Variables}).
@item :safe @var{function}
@kindex safe@r{, @code{defcustom} keyword}
-Set this variable's @code{safe-local-variable} property to @var{function}.
+Set the variable's @code{safe-local-variable} property to
+@var{function} (@pxref{File Local Variables}).
@item :set-after @var{variables}
@kindex set-after@r{, @code{defcustom} keyword}
those other variables already have their intended values.
@end table
- The @code{:require} keyword is useful for an option that turns on the
-operation of a certain feature. Assuming that the package is coded to
-check the value of the option, you still need to arrange for the package
-to be loaded. You can do that with @code{:require}. @xref{Common
-Keywords}. Here is an example, from the library @file{saveplace.el}:
+ It is useful to specify the @code{:require} keyword for an option
+that ``turns on'' a certain feature. This causes Emacs to load the
+feature, if it is not already loaded, whenever the option is set.
+@xref{Common Keywords}. Here is an example, from the library
+@file{saveplace.el}:
@example
(defcustom save-place nil
Internally, @code{defcustom} uses the symbol property
@code{standard-value} to record the expression for the standard value,
-and @code{saved-value} to record the value saved by the user with the
-customization buffer. Both properties are actually lists whose car is
-an expression which evaluates to the value.
+@code{saved-value} to record the value saved by the user with the
+customization buffer, and @code{customized-value} to record the value
+set by the user with the customization buffer, but not saved.
+@xref{Property Lists}. These properties are lists, the car of which
+is an expression that evaluates to the value.
+
+@defun custom-reevaluate-setting symbol
+This function re-evaluates the standard value of @var{symbol}, which
+should be a user option declared via @code{defcustom}. (If the
+variable was customized, this function re-evaluates the saved value
+instead.) This is useful for customizable options that are defined
+before their value could be computed correctly, such as variables
+defined in packages that are loaded at dump time, but depend on the
+run-time information. For example, the value could be a file whose
+precise name depends on the hierarchy of files when Emacs runs, or a
+name of a program that needs to be searched at run time.
+
+A good place to put calls to this function is in the function
+@code{command-line} that is run during startup (@pxref{Startup Summary})
+or in the various hooks it calls.
+@end defun
@node Customization Types
@section Customization Types
the symbol. Between the type symbol and its arguments, you can
optionally write keyword-value pairs (@pxref{Type Keywords}).
- Some of the type symbols do not use any arguments; those are called
+ Some type symbols do not use any arguments; those are called
@dfn{simple types}. For a simple type, if you do not use any
keyword-value pairs, you can omit the parentheses around the type
symbol. For example just @code{string} as a customization type is
equivalent to @code{(string)}.
+ All customization types are implemented as widgets; see @ref{Top, ,
+Introduction, widget, The Emacs Widget Library}, for details.
+
@menu
-* Simple Types::
-* Composite Types::
-* Splicing into Lists::
-* Type Keywords::
-* Defining New Types::
+* Simple Types:: Simple customization types: sexp, integer, number,
+ string, file, directory, alist.
+* Composite Types:: Build new types from other types or data.
+* Splicing into Lists:: Splice elements into list with @code{:inline}.
+* Type Keywords:: Keyword-argument pairs in a customization type.
+* Defining New Types:: Give your type a name.
@end menu
-All customization types are implemented as widgets; see @ref{Top, ,
-Introduction, widget, The Emacs Widget Library}, for details.
-
@node Simple Types
@subsection Simple Types
@node Composite Types
@subsection Composite Types
-@cindex Composite Types (customization)
+@cindex composite types (customization)
When none of the simple types is appropriate, you can use composite
types, which build new types from other types or from specified data.
two arguments, a widget and a value; it should return non-@code{nil} if
the value is acceptable.
+@item :validate @var{function}
+Specify a validation function for input. @var{function} takes a
+widget as an argument, and should return @code{nil} if the widget's
+current value is valid for the widget. Otherwise, it should return
+the widget containing the invalid data, and set that widget's
+@code{:error} property to a string explaining the error.
+
@ignore
@item :indent @var{columns}
Indent this item by @var{columns} columns. The indentation is used for
buttons, and for editable lists. It affects the whole of the
item except for the first line.
-@item :offset @var{columns}
-An integer indicating how many extra spaces to indent the subitems of
-this item. By default, subitems are indented the same as their parent.
+@item :offset @var{extra}
+Indent the subitems of this item @var{extra} columns more than this
+item itself. By default, subitems are indented the same as their
+parent.
-@item :extra-offset
-An integer indicating how many extra spaces to add to this item's
-indentation, compared to its parent.
+@item :extra-offset @var{n}
+Add @var{n} extra spaces to this item's indentation, compared to its
+parent's indentation.
-@item :notify
-A function called each time the item or a subitem is changed. The
-function is called with two or three arguments. The first argument is
-the item itself, the second argument is the item that was changed, and
-the third argument is the event leading to the change, if any.
+@item :notify @var{function}
+Call @var{function} each time the item or a subitem is changed. The
+function gets two or three arguments. The first argument is the item
+itself, the second argument is the item that was changed, and the
+third argument is the event leading to the change, if any.
-@item :menu-tag
-A tag used in the menu when the widget is used as an option in a
-@code{menu-choice} widget.
+@item :menu-tag @var{tag-string}
+Use @var{tag-string} in the menu when the widget is used as an option
+in a @code{menu-choice} widget.
@item :menu-tag-get
A function used for finding the tag when the widget is used as an option
@code{:menu-tag} or @code{:tag} property if present, or the @code{princ}
representation of the @code{:value} property if not.
-@item :validate
-A function which takes a widget as an argument, and return @code{nil}
-if the widget's current value is valid for the widget. Otherwise, it
-should return the widget containing the invalid data, and set that
-widget's @code{:error} property to a string explaining the error.
-
-You can use the function @code{widget-children-validate} for this job;
-it tests that all children of @var{widget} are valid.
-
@item :tab-order
Specify the order in which widgets are traversed with
@code{widget-forward} or @code{widget-backward}. This is only partially
the data structure is itself recursive, this conversion is an infinite
recursion. The @code{lazy} widget prevents the recursion: it convert
its @code{:type} argument only when needed.
-
-@ignore
- arch-tag: d1b8fad3-f48c-4ce4-a402-f73b5ef19bd2
-@end ignore