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1 ;;; options.el --- edit Options command for XEmacs.
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2
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3 ;; Copyright (C) 1985, 1993 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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21 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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22 ;; 02111-1307, USA.
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23
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24 ;;; Synched up with: FSF 19.34.
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25
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26 ;;; Commentary:
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27
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28 ;; This code provides functions to list and edit the values of all global
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29 ;; option variables known to loaded Emacs Lisp code. There are two entry
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30 ;; points, `list-options' and `edit' options'. The latter enters a major
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31 ;; mode specifically for editing option values. Do `M-x describe-mode' in
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32 ;; that context for more details.
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33
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34 ;;; Code:
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35
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36 ;;;###autoload
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37 (defun list-options ()
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38 "Display a list of XEmacs user options, with values and documentation."
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39 (interactive)
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40 (save-excursion
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41 (set-buffer (get-buffer-create "*List Options*"))
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42 (Edit-options-mode))
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43 (with-output-to-temp-buffer "*List Options*"
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44 (let (vars)
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45 (mapatoms #'(lambda (sym) ; XEmacs
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46 (if (user-variable-p sym)
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47 (setq vars (cons sym vars)))))
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48 (setq vars (sort vars 'string-lessp))
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49 (while vars
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50 (let ((sym (car vars)))
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51 (princ ";; ")
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52 (prin1 sym)
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53 (princ ":\n\t")
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54 (if (boundp sym) ; XEmacs
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55 (prin1 (symbol-value sym))
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56 (princ "#<unbound>"))
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57 (terpri)
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58 (princ (substitute-command-keys
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59 (documentation-property sym 'variable-documentation)))
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60 (princ "\n;;\n"))
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61 (setq vars (cdr vars)))))
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62 (save-excursion
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63 (set-buffer "*List Options*")
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64 (setq buffer-read-only t)))
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65
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66 ;;;###autoload
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67 (defun edit-options ()
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68 "Edit a list of XEmacs user option values.
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69 Selects a buffer containing such a list,
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70 in which there are commands to set the option values.
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71 Type \\[describe-mode] in that buffer for a list of commands."
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72 (interactive)
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73 (list-options)
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74 (pop-to-buffer "*List Options*"))
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75
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76 (defvar Edit-options-mode-map
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77 (let ((map (make-keymap)))
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78 (define-key map "s" 'Edit-options-set)
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79 (define-key map "x" 'Edit-options-toggle)
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80 (define-key map "1" 'Edit-options-t)
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81 (define-key map "0" 'Edit-options-nil)
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82 (define-key map "p" 'backward-paragraph)
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83 (define-key map " " 'forward-paragraph)
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84 (define-key map "n" 'forward-paragraph)
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85 map)
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86 "")
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87
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88 ;; Edit Options mode is suitable only for specially formatted data.
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89 (put 'Edit-options-mode 'mode-class 'special)
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90
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91 (defun Edit-options-mode ()
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92 "\\<Edit-options-mode-map>\
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93 Major mode for editing XEmacs user option settings.
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94 Special commands are:
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95 \\[Edit-options-set] -- set variable point points at. New value read using minibuffer.
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96 \\[Edit-options-toggle] -- toggle variable, t -> nil, nil -> t.
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97 \\[Edit-options-t] -- set variable to t.
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98 \\[Edit-options-nil] -- set variable to nil.
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99 Changed values made by these commands take effect immediately.
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100
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101 Each variable description is a paragraph.
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102 For convenience, the characters \\[backward-paragraph] and \\[forward-paragraph] move back and forward by paragraphs."
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103 (kill-all-local-variables)
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104 (set-syntax-table emacs-lisp-mode-syntax-table)
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105 (use-local-map Edit-options-mode-map)
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106 (make-local-variable 'paragraph-separate)
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107 (setq paragraph-separate "[^\^@-\^?]")
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108 (make-local-variable 'paragraph-start)
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109 (setq paragraph-start "\t")
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110 (setq truncate-lines t)
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111 (setq major-mode 'Edit-options-mode)
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112 (setq mode-name (gettext "Options")) ; XEmacs
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113 (run-hooks 'Edit-options-mode-hook))
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114
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115 (defun Edit-options-set () (interactive)
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116 (Edit-options-modify
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117 '(lambda (var) (eval-minibuffer (concat "New " (symbol-name var) ": ")))))
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118
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119 (defun Edit-options-toggle () (interactive)
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120 (Edit-options-modify '(lambda (var) (not (symbol-value var)))))
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121
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122 (defun Edit-options-t () (interactive)
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123 (Edit-options-modify '(lambda (var) t)))
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124
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125 (defun Edit-options-nil () (interactive)
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126 (Edit-options-modify '(lambda (var) nil)))
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127
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128 (defun Edit-options-modify (modfun)
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129 (save-excursion
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130 (let ((buffer-read-only nil) var pos)
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131 (re-search-backward "^;; \\|\\`")
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132 (forward-char 3)
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133 (setq pos (point))
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134 (save-restriction
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135 (narrow-to-region pos (progn (end-of-line) (1- (point))))
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136 (goto-char pos)
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137 (setq var (read (current-buffer))))
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138 (goto-char pos)
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139 (forward-line 1)
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140 (forward-char 1)
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141 (save-excursion
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142 (set var (funcall modfun var)))
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143 (kill-sexp 1)
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144 (prin1 (symbol-value var) (current-buffer)))))
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145
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146 ;;; options.el ends here
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