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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, 675 Mass Ave, Cambridge, MA 02139, USA.
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22
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23 ;;; Synched up with: FSF 19.30.
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24
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25 ;;; Commentary:
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26
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27 ;; This code provides functions to list and edit the values of all global
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28 ;; option variables known to loaded Emacs Lisp code. There are two entry
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29 ;; points, `list-options' and `edit' options'. The latter enters a major
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30 ;; mode specifically for editing option values. Do `M-x describe-mode' in
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31 ;; that context for more details.
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32
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33 ;;; Code:
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34
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35 ;;;###autoload
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36 (defun list-options ()
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37 "Display a list of XEmacs user options, with values and documentation."
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38 (interactive)
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39 (save-excursion
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40 (set-buffer (get-buffer-create "*List Options*"))
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41 (Edit-options-mode))
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42 (with-output-to-temp-buffer "*List Options*"
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43 (let (vars)
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44 (mapatoms #'(lambda (sym)
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45 (if (user-variable-p sym)
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46 (setq vars (cons sym vars)))))
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47 (setq vars (sort vars 'string-lessp))
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48 (while vars
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49 (let ((sym (car vars)))
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50 (princ ";; ")
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51 (prin1 sym)
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52 (princ ":\n\t")
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53 (if (boundp sym)
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54 (prin1 (symbol-value sym))
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55 (princ "#<unbound>"))
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56 (terpri)
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57 (princ (substitute-command-keys
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58 (documentation-property sym 'variable-documentation)))
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59 (princ "\n;;\n"))
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60 (setq vars (cdr vars)))))
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61 (save-excursion
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62 (set-buffer "*List Options*")
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63 (setq buffer-read-only t)))
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64
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65 ;;;###autoload
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66 (defun edit-options ()
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67 "Edit a list of XEmacs user option values.
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68 Selects a buffer containing such a list,
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69 in which there are commands to set the option values.
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70 Type \\[describe-mode] in that buffer for a list of commands."
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71 (interactive)
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72 (list-options)
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73 (pop-to-buffer "*List Options*"))
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74
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75 (defvar Edit-options-mode-map
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76 (let ((map (make-keymap)))
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77 (define-key map "s" 'Edit-options-set)
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78 (define-key map "x" 'Edit-options-toggle)
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79 (define-key map "1" 'Edit-options-t)
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80 (define-key map "0" 'Edit-options-nil)
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81 (define-key map "p" 'backward-paragraph)
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82 (define-key map " " 'forward-paragraph)
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83 (define-key map "n" 'forward-paragraph)
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84 map)
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85 "")
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86
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87 ;; Edit Options mode is suitable only for specially formatted data.
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88 (put 'Edit-options-mode 'mode-class 'special)
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89
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90 (defun Edit-options-mode ()
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91 "\\<Edit-options-mode-map>\
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92 Major mode for editing XEmacs user option settings.
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93 Special commands are:
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94 \\[Edit-options-set] -- set variable point points at. New value read using minibuffer.
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95 \\[Edit-options-toggle] -- toggle variable, t -> nil, nil -> t.
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96 \\[Edit-options-t] -- set variable to t.
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97 \\[Edit-options-nil] -- set variable to nil.
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98 Changed values made by these commands take effect immediately.
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99
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100 Each variable description is a paragraph.
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101 For convenience, the characters \\[backward-paragraph] and \\[forward-paragraph] move back and forward by paragraphs."
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102 (kill-all-local-variables)
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103 (set-syntax-table emacs-lisp-mode-syntax-table)
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104 (use-local-map Edit-options-mode-map)
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105 (make-local-variable 'paragraph-separate)
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106 (setq paragraph-separate "[^\^@-\^?]")
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107 (make-local-variable 'paragraph-start)
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108 (setq paragraph-start "\t")
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109 (setq truncate-lines t)
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110 (setq major-mode 'Edit-options-mode)
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111 (setq mode-name (gettext "Options"))
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112 (run-hooks 'Edit-options-mode-hook))
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113
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114 (defun Edit-options-set () (interactive)
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115 (Edit-options-modify
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116 '(lambda (var) (eval-minibuffer (format "New %s:" (symbol-name var))))))
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117
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118 (defun Edit-options-toggle () (interactive)
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119 (Edit-options-modify '(lambda (var) (not (symbol-value var)))))
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120
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121 (defun Edit-options-t () (interactive)
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122 (Edit-options-modify '(lambda (var) t)))
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123
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124 (defun Edit-options-nil () (interactive)
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125 (Edit-options-modify '(lambda (var) nil)))
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126
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127 (defun Edit-options-modify (modfun)
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128 (save-excursion
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129 (let ((buffer-read-only nil) var pos)
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130 (re-search-backward "^;; \\|\\`")
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131 (forward-char 3)
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132 (setq pos (point))
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133 (save-restriction
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134 (narrow-to-region pos (progn (end-of-line) (1- (point))))
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135 (goto-char pos)
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136 (setq var (read (current-buffer))))
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137 (goto-char pos)
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138 (forward-line 1)
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139 (forward-char 1)
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140 (save-excursion
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141 (set var (funcall modfun var)))
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142 (kill-sexp 1)
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143 (prin1 (symbol-value var) (current-buffer)))))
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144
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145 ;;; options.el ends here
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