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- ;; Edit Options command for Emacs.
- ;; Copyright (C) 1985 Free Software Foundation, Inc.
-
- ;; This file is part of GNU Emacs.
-
- ;; GNU Emacs is distributed in the hope that it will be useful,
- ;; but WITHOUT ANY WARRANTY. No author or distributor
- ;; accepts responsibility to anyone for the consequences of using it
- ;; or for whether it serves any particular purpose or works at all,
- ;; unless he says so in writing. Refer to the GNU Emacs General Public
- ;; License for full details.
-
- ;; Everyone is granted permission to copy, modify and redistribute
- ;; GNU Emacs, but only under the conditions described in the
- ;; GNU Emacs General Public License. A copy of this license is
- ;; supposed to have been given to you along with GNU Emacs so you
- ;; can know your rights and responsibilities. It should be in a
- ;; file named COPYING. Among other things, the copyright notice
- ;; and this notice must be preserved on all copies.
-
-
- (defun list-options ()
- "Display a list of Emacs user options, with values and documentation."
- (interactive)
- (save-excursion
- (set-buffer (get-buffer-create "*List Options*"))
- (Edit-options-mode))
- (with-output-to-temp-buffer "*List Options*"
- (let (vars)
- (mapatoms (function (lambda (sym)
- (if (user-variable-p sym)
- (setq vars (cons sym vars))))))
- (setq vars (sort vars 'string-lessp))
- (while vars
- (let ((sym (car vars)))
- (princ ";; ")
- (prin1 sym)
- (princ ":\n\t")
- (prin1 (symbol-value sym))
- (terpri)
- (princ (substitute-command-keys
- (documentation-property sym 'variable-documentation)))
- (princ "\n;;\n"))
- (setq vars (cdr vars))))))
-
- (defun edit-options ()
- "Edit a list of Emacs user option values.
- Selects a buffer containing such a list,
- in which there are commands to set the option values.
- Type \\[describe-mode] in that buffer for a list of commands."
- (interactive)
- (list-options)
- (pop-to-buffer "*List Options*"))
-
- (defvar Edit-options-mode-map
- (let ((map (make-keymap)))
- (define-key map "s" 'Edit-options-set)
- (define-key map "x" 'Edit-options-toggle)
- (define-key map "1" 'Edit-options-t)
- (define-key map "0" 'Edit-options-nil)
- (define-key map "p" 'backward-paragraph)
- (define-key map " " 'forward-paragraph)
- (define-key map "n" 'forward-paragraph)
- map)
- "")
-
- ;; Edit Options mode is suitable only for specially formatted data.
- (put 'Edit-options-mode 'mode-class 'special)
-
- (defun Edit-options-mode ()
- "Major mode for editing Emacs user option settings.
- Special commands are:
- s -- set variable point points at. New value read using minibuffer.
- x -- toggle variable, t -> nil, nil -> t.
- 1 -- set variable to t.
- 0 -- set variable to nil.
- Each variable description is a paragraph.
- For convenience, the characters p and n move back and forward by paragraphs."
- (kill-all-local-variables)
- (set-syntax-table emacs-lisp-mode-syntax-table)
- (use-local-map Edit-options-mode-map)
- (make-local-variable 'paragraph-separate)
- (setq paragraph-separate "[^\^@-\^?]")
- (make-local-variable 'paragraph-start)
- (setq paragraph-start "^\t")
- (setq truncate-lines t)
- (setq major-mode 'Edit-options-mode)
- (setq mode-name "Options"))
-
- (defun Edit-options-set () (interactive)
- (Edit-options-modify
- '(lambda (var) (eval-minibuffer (concat "New " (symbol-name var) ": ")))))
-
- (defun Edit-options-toggle () (interactive)
- (Edit-options-modify '(lambda (var) (not (symbol-value var)))))
-
- (defun Edit-options-t () (interactive)
- (Edit-options-modify '(lambda (var) t)))
-
- (defun Edit-options-nil () (interactive)
- (Edit-options-modify '(lambda (var) nil)))
-
- (defun Edit-options-modify (modfun)
- (save-excursion
- (let (var pos)
- (re-search-backward "^;; ")
- (forward-char 3)
- (setq pos (point))
- (save-restriction
- (narrow-to-region pos (progn (end-of-line) (1- (point))))
- (goto-char pos)
- (setq var (read (current-buffer))))
- (goto-char pos)
- (forward-line 1)
- (forward-char 1)
- (save-excursion
- (set var (funcall modfun var)))
- (kill-sexp 1)
- (prin1 (symbol-value var) (current-buffer)))))
-
-