home *** CD-ROM | disk | FTP | other *** search
- ;;; custom.el -- Tools for declaring and initializing options.
- ;;
- ;; Copyright (C) 1996, 1997 Free Software Foundation, Inc.
- ;;
- ;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
- ;; Maintainer: Hrvoje Niksic <hniksic@srce.hr>
- ;; Keywords: help, faces
- ;; Version: 1.9960-x
- ;; X-URL: http://www.dina.kvl.dk/~abraham/custom/
-
- ;; This file is part of XEmacs.
-
- ;; XEmacs 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 2, or (at your option)
- ;; any later version.
-
- ;; XEmacs 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 XEmacs; see the file COPYING. If not, write to the
- ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
- ;;; Commentary:
- ;;
- ;; If you want to use this code, please visit the URL above.
- ;;
- ;; This file only contain the code needed to declare and initialize
- ;; user options. The code to customize options is autoloaded from
- ;; `cus-edit.el'.
- ;;
- ;; 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.")
-
- ;;; 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.
- Otherwise, VALUE will be evaluated and used as the default binding for
- symbol."
- (unless (default-boundp symbol)
- ;; Use the saved value if it exists, otherwise the standard setting.
- (set-default symbol (if (get symbol 'saved-value)
- (eval (car (get symbol 'saved-value)))
- (eval value)))))
-
- (defun custom-initialize-set (symbol value)
- "Initialize SYMBOL with VALUE.
- Like `custom-initialize-default', but use the function specified by
- `:set' to initialize SYMBOL."
- (unless (default-boundp symbol)
- (funcall (or (get symbol 'custom-set) 'set-default)
- symbol
- (if (get symbol 'saved-value)
- (eval (car (get symbol 'saved-value)))
- (eval value)))))
-
- (defun custom-initialize-reset (symbol value)
- "Initialize SYMBOL with VALUE.
- Like `custom-initialize-set', but use the function specified by
- `:get' to reinitialize SYMBOL if it is already bound."
- (funcall (or (get symbol 'custom-set) 'set-default)
- symbol
- (cond ((default-boundp symbol)
- (funcall (or (get symbol 'custom-get) 'default-value)
- symbol))
- ((get symbol 'saved-value)
- (eval (car (get symbol 'saved-value))))
- (t
- (eval value)))))
-
- (defun custom-initialize-changed (symbol value)
- "Initialize SYMBOL with VALUE.
- Like `custom-initialize-reset', but only use the `:set' function if the
- not using the standard setting. Otherwise, use the `set-default'."
- (cond ((default-boundp symbol)
- (funcall (or (get symbol 'custom-set) 'set-default)
- symbol
- (funcall (or (get symbol 'custom-get) 'default-value)
- symbol)))
- ((get symbol 'saved-value)
- (funcall (or (get symbol 'custom-set) 'set-default)
- symbol
- (eval (car (get symbol 'saved-value)))))
- (t
- (set-default symbol (eval value)))))
-
- (defun custom-declare-variable (symbol value doc &rest args)
- "Like `defcustom', but SYMBOL and VALUE are evaluated as normal arguments."
- ;; Remember the standard setting.
- (put symbol 'standard-value (list value))
- ;; Maybe this option was rogue in an earlier version. It no longer is.
- (when (get symbol 'force-value)
- ;; It no longer is.
- (put symbol 'force-value nil))
- (when doc
- (put symbol 'variable-documentation doc))
- (let ((initialize 'custom-initialize-reset)
- (requests nil))
- (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)
- (setq requests (cons value requests)))
- ((eq keyword :type)
- (put symbol 'custom-type 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.
- (funcall initialize symbol value))
- (run-hooks 'custom-define-hook)
- symbol)
-
- (defmacro defcustom (symbol value doc &rest args)
- "Declare SYMBOL as a customizable variable that defaults to VALUE.
- DOC is the variable documentation.
-
- Neither SYMBOL nor VALUE needs to be quoted.
- If SYMBOL is not already bound, initialize it to VALUE.
- The remaining arguments should have the form
-
- [KEYWORD VALUE]...
-
- The following KEYWORD's are defined:
-
- :type VALUE should be a widget type for editing the symbols value.
- The default is `sexp'.
- :options VALUE should be a list of valid members of the widget type.
- :group VALUE should be a customization group.
- Add SYMBOL to that group.
- :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-set'
- :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 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 is
- `default-value'.
- :require VALUE should be a feature symbol. Each feature will be
- required after initialization, of the the user have saved this
- option.
-
- Read the section about customization in the Emacs Lisp manual for more
- information."
- `(custom-declare-variable (quote ,symbol) (quote ,value) ,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-set-face', 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]...
-
- The following KEYWORDs are defined:
-
- :group VALUE should be a customization group.
- Add FACE to that group.
-
- SPEC should be an alist of the form ((DISPLAY ATTS)...).
-
- ATTS is a list of face attributes and their values. The possible
- attributes are defined in the variable `custom-face-attributes'.
-
- The ATTS of the first entry in SPEC where the DISPLAY matches the
- frame should take effect in that frame. DISPLAY can either be the
- symbol t, which will match all frames, or an alist of the form
- \((REQ ITEM...)...)
-
- For the DISPLAY to match a FRAME, the REQ property of the frame must
- match one of the ITEM. The following REQ are defined:
-
- `type' (the value of `window-system')
- Should be one of `x' or `tty'.
-
- `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'.
-
- Read the section about customization in the Emacs Lisp manual for more
- information."
- `(custom-declare-face (quote ,face) ,spec ,doc ,@args))
-
- ;;; The `defgroup' Macro.
-
- (defun custom-declare-group (symbol members doc &rest args)
- "Like `defgroup', but SYMBOL is evaluated as a normal argument."
- (while members
- (apply 'custom-add-to-group symbol (car members))
- (pop members))
- (put symbol 'custom-group (nconc members (get symbol 'custom-group)))
- (when doc
- (put symbol 'group-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 :prefix)
- (put symbol 'custom-prefix value))
- (t
- (custom-handle-keyword symbol keyword value
- 'custom-group))))))
- (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 arg DOC is the group documentation.
-
- MEMBERS should be an alist of the form ((NAME WIDGET)...) where NAME
- is a symbol and WIDGET is a widget 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]...
-
- The following KEYWORD's are defined:
-
- :group VALUE should be a customization group.
- Add SYMBOL to that group.
-
- Read the section about customization in the Emacs Lisp manual for more
- information."
- `(custom-declare-group (quote ,symbol) ,members ,doc ,@args))
-
- ;; This is preloaded very early, so we avoid using CL features.
- (defvar custom-group-hash-table (make-hashtable 300 'eq)
- "Hash-table of non-empty groups.")
-
- (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))))))
- (puthash group t custom-group-hash-table))
-
- ;;; 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."
- (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."
- (cond ((eq keyword :group)
- (custom-add-to-group value symbol type))
- ((eq keyword :link)
- (custom-add-link symbol value))
- ((eq keyword :load)
- (custom-add-load symbol value))
- ((eq keyword :tag)
- (put symbol 'custom-tag value))
- (t
- (error "Unknown keyword %s" symbol))))
-
- (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."
- (let ((options (get symbol 'custom-options)))
- (unless (member option options)
- (put symbol 'custom-options (cons option options)))))
-
- (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 widget links)))))
-
- (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)))))
-
- ;;; Initializing.
-
- (defun custom-set-variables (&rest args)
- "Initialize variables according to user preferences.
-
- The arguments should be a list where each entry has the form:
-
- (SYMBOL VALUE [NOW])
-
- The unevaluated VALUE is stored as the saved value for SYMBOL.
- If NOW is present and non-nil, VALUE is also evaluated and bound as
- the default value for the SYMBOL."
- (while args
- (let ((entry (car args)))
- (if (listp entry)
- (let* ((symbol (nth 0 entry))
- (value (nth 1 entry))
- (now (nth 2 entry))
- (requests (nth 3 entry))
- (set (or (get symbol 'custom-set) 'set-default)))
- (put symbol 'saved-value (list value))
- (cond (now
- ;; Rogue variable, set it now.
- (put symbol 'force-value t)
- (funcall set symbol (eval value)))
- ((default-boundp symbol)
- ;; Something already set this, overwrite it.
- (funcall set symbol (eval value))))
- (when requests
- (put symbol 'custom-requests requests)
- (mapc 'require requests))
- (setq args (cdr args)))
- ;; 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)))))))
-
- ;;; The End.
-
- (provide 'custom)
-
- ;; custom.el ends here
-