view lisp/x-misc.el @ 4502:8748a3f7ceb4

Handle varalias chains, custom variables in #'user-variable-p. src/ChangeLog addition: 2008-08-23 Aidan Kehoe <kehoea@parhasard.net> * eval.c (Fuser_variable_p): Moved to symbols.c * symbols.c (Fcustom_variable_p): Moved here from custom.el. (user_variable_alias_check_fun): Mapper function used in `user-variable-p'. (Fuser_variable_p): Moved here from eval.c, to allow it to examine the variable alias chain. Expanded to check each entry in the variable alias chain for signs of being a user variable; documentation updated, noting the differences between GNU's behaviour and ours (ours is a little more sensible) (map_varalias_chain): New. Given a C function, call it at least once for each symbol in a symbol's varalias chain, signalling an error if there's a cycle, and returning immediately if the function returns something other than Qzero. (Fdefvaralias): Correct the use of the word "alias" in the docstring and in the argument name. Motivate this in a comment. Add support for a DOCSTRING argument, something GNU has too, and document this * gc.c (vars_of_gc): Start the docstring of `garbage-collection-messages' with an asterisk, to indicate that it's a user variable. lisp/ChangeLog addition: 2008-08-23 Aidan Kehoe <kehoea@parhasard.net> * custom.el: Move #'custom-variable-p to C, since it's now called from #'user-variable-p.
author Aidan Kehoe <kehoea@parhasard.net>
date Sat, 23 Aug 2008 16:38:51 +0200
parents 7039e6323819
children e29fcfd8df5f
line wrap: on
line source

;;; x-misc.el --- miscellaneous X functions.

;; Copyright (C) 1997 Free Software Foundation, Inc.
;; Copyright (C) 1995 Sun Microsystems.
;; Copyright (C) 1995, 1996 Ben Wing.

;; Author: Ben Wing <ben@xemacs.org>
;; Maintainer: XEmacs Development Team
;; Keywords: extensions, dumped

;; 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, 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; This file is dumped with XEmacs (when X support is compiled in).

;;; Code:

(globally-declare-fboundp
 '(x-get-resource))

(defun x-bogosity-check-resource (name class type)
  "Check for a bogus resource specification."
  (let ((bogus (x-get-resource
		(concat "__no-such-friggin-locale__." name)
		(concat "__No-such-friggin-widget__." class)
		type 'global nil t)))
    (if bogus
	(display-warning
	 'resource
	 (format "Bad resource specification encountered: something like
     Emacs*%s: %s
You should replace the * with a . in order to get proper behavior when
you use the specifier and/or `set-face-*' functions." name bogus)))))

(defun x-init-specifier-from-resources (specifier type locale
						  &rest resource-list)
  "Initialize a specifier from the resource database.
LOCALE specifies the locale that is to be initialized and should be
a frame, a device, or 'global.  TYPE is the type of the resource and
should be one of 'string, 'boolean, 'integer, or 'natnum.  The
remaining args should be conses of names and classes of resources
to be examined.  The first resource with a value specified becomes
the spec for SPECIFIER in LOCALE. (However, if SPECIFIER already
has a spec in LOCALE, nothing is done.) Finally, if LOCALE is 'global,
a check is done for bogus resource specifications."
  (if (eq locale 'global)
      (mapcar #'(lambda (x)
		  (x-bogosity-check-resource (car x) (cdr x) type))
	      resource-list))
  (if (not (specifier-spec-list specifier locale))
      (catch 'done
	(while resource-list
	  (let* ((name (caar resource-list))
		 (class (cdar resource-list))
		 (resource
		  (x-get-resource name class type locale nil 'warn)))
	    (if resource
		(progn
		  (add-spec-to-specifier specifier resource locale)
		  (throw 'done t))))
	  (setq resource-list (cdr resource-list))))))

(defun x-get-resource-and-bogosity-check (name class type &optional locale)
  (x-bogosity-check-resource name class type)
  (x-get-resource name class type locale nil 'warn))

(defun x-get-resource-and-maybe-bogosity-check (name class type &optional
						     locale)
  (if (eq locale 'global)
      (x-bogosity-check-resource name class type))
  (x-get-resource name class type locale nil 'warn))

;;; x-misc.el ends here