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;;; options.el --- edit Options command for Emacs

;; Copyright (C) 1985 Free Software Foundation, Inc.

;; Maintainer: FSF

;; 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 2, 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; This code provides functions to list and edit the values of all global
;; option variables known to loaded Emacs Lisp code.  There are two entry
;; points, `list-options' and `edit' options'.  The latter enters a major
;; mode specifically for editing option values.  Do `M-x describe-mode' in
;; that context for more details.

;; The customization buffer feature is intended to make this obsolete.

;;; Code:

;;;###autoload
(defun list-options ()
  "Display a list of Emacs user options, with values and documentation.
It is now better to use Customize instead."
  (interactive)
  (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)))
	  (when (boundp sym)
	    (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))))
      (with-current-buffer "*List Options*"
	(Edit-options-mode)
	(setq buffer-read-only t)))))

;;;###autoload
(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.

The Custom feature is intended to make this obsolete."
  (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 ()
  "\\<Edit-options-mode-map>\
Major mode for editing Emacs user option settings.
Special commands are:
\\[Edit-options-set] -- set variable point points at.  New value read using minibuffer.
\\[Edit-options-toggle] -- toggle variable, t -> nil, nil -> t.
\\[Edit-options-t] -- set variable to t.
\\[Edit-options-nil] -- set variable to nil.
Changed values made by these commands take effect immediately.

Each variable description is a paragraph.
For convenience, the characters \\[backward-paragraph] and \\[forward-paragraph] 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")
  (run-hooks 'Edit-options-mode-hook))

(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 ((buffer-read-only nil) 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)))))

(provide 'options)

;;; options.el ends here