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1 | ;;; options.el --- edit Options command for Emacs. |
2 | ||
07c61707 RA |
3 | ;; Copyright (C) 1985 Free Software Foundation, Inc. |
4 | ||
9750e079 ER |
5 | ;; Maintainer: FSF |
6 | ||
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7 | ;; This file is part of GNU Emacs. |
8 | ||
9 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 11 | ;; the Free Software Foundation; either version 2, or (at your option) |
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12 | ;; any later version. |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
21 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | ;; Boston, MA 02111-1307, USA. | |
07c61707 | 23 | |
edbd2f74 ER |
24 | ;;; Commentary: |
25 | ||
26 | ;; This code provides functions to list and edit the values of all global | |
27 | ;; option variables known to loaded Emacs Lisp code. There are two entry | |
28 | ;; points, `list-options' and `edit' options'. The latter enters a major | |
29 | ;; mode specifically for editing option values. Do `M-x describe-mode' in | |
30 | ;; that context for more details. | |
31 | ||
e5167999 | 32 | ;;; Code: |
07c61707 | 33 | |
f9f9507e | 34 | ;;;###autoload |
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35 | (defun list-options () |
36 | "Display a list of Emacs user options, with values and documentation." | |
37 | (interactive) | |
38 | (save-excursion | |
39 | (set-buffer (get-buffer-create "*List Options*")) | |
40 | (Edit-options-mode)) | |
41 | (with-output-to-temp-buffer "*List Options*" | |
42 | (let (vars) | |
43 | (mapatoms (function (lambda (sym) | |
44 | (if (user-variable-p sym) | |
45 | (setq vars (cons sym vars)))))) | |
46 | (setq vars (sort vars 'string-lessp)) | |
47 | (while vars | |
48 | (let ((sym (car vars))) | |
49 | (princ ";; ") | |
50 | (prin1 sym) | |
51 | (princ ":\n\t") | |
52 | (prin1 (symbol-value sym)) | |
53 | (terpri) | |
54 | (princ (substitute-command-keys | |
55 | (documentation-property sym 'variable-documentation))) | |
56 | (princ "\n;;\n")) | |
9b8002ba RS |
57 | (setq vars (cdr vars))))) |
58 | (save-excursion | |
59 | (set-buffer "*List Options*") | |
60 | (setq buffer-read-only t))) | |
07c61707 | 61 | |
f9f9507e | 62 | ;;;###autoload |
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63 | (defun edit-options () |
64 | "Edit a list of Emacs user option values. | |
65 | Selects a buffer containing such a list, | |
66 | in which there are commands to set the option values. | |
67 | Type \\[describe-mode] in that buffer for a list of commands." | |
68 | (interactive) | |
69 | (list-options) | |
70 | (pop-to-buffer "*List Options*")) | |
71 | ||
72 | (defvar Edit-options-mode-map | |
73 | (let ((map (make-keymap))) | |
74 | (define-key map "s" 'Edit-options-set) | |
75 | (define-key map "x" 'Edit-options-toggle) | |
76 | (define-key map "1" 'Edit-options-t) | |
77 | (define-key map "0" 'Edit-options-nil) | |
78 | (define-key map "p" 'backward-paragraph) | |
79 | (define-key map " " 'forward-paragraph) | |
80 | (define-key map "n" 'forward-paragraph) | |
81 | map) | |
82 | "") | |
83 | ||
84 | ;; Edit Options mode is suitable only for specially formatted data. | |
85 | (put 'Edit-options-mode 'mode-class 'special) | |
86 | ||
87 | (defun Edit-options-mode () | |
6d1f885f BP |
88 | "\\<Edit-options-mode-map>\ |
89 | Major mode for editing Emacs user option settings. | |
07c61707 | 90 | Special commands are: |
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91 | \\[Edit-options-set] -- set variable point points at. New value read using minibuffer. |
92 | \\[Edit-options-toggle] -- toggle variable, t -> nil, nil -> t. | |
93 | \\[Edit-options-t] -- set variable to t. | |
94 | \\[Edit-options-nil] -- set variable to nil. | |
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95 | Changed values made by these commands take effect immediately. |
96 | ||
97 | Each variable description is a paragraph. | |
6d1f885f | 98 | For convenience, the characters \\[backward-paragraph] and \\[forward-paragraph] move back and forward by paragraphs." |
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99 | (kill-all-local-variables) |
100 | (set-syntax-table emacs-lisp-mode-syntax-table) | |
101 | (use-local-map Edit-options-mode-map) | |
102 | (make-local-variable 'paragraph-separate) | |
103 | (setq paragraph-separate "[^\^@-\^?]") | |
104 | (make-local-variable 'paragraph-start) | |
3d6663bb | 105 | (setq paragraph-start "\t") |
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106 | (setq truncate-lines t) |
107 | (setq major-mode 'Edit-options-mode) | |
108 | (setq mode-name "Options") | |
109 | (run-hooks 'Edit-options-mode-hook)) | |
110 | ||
111 | (defun Edit-options-set () (interactive) | |
112 | (Edit-options-modify | |
113 | '(lambda (var) (eval-minibuffer (concat "New " (symbol-name var) ": "))))) | |
114 | ||
115 | (defun Edit-options-toggle () (interactive) | |
116 | (Edit-options-modify '(lambda (var) (not (symbol-value var))))) | |
117 | ||
118 | (defun Edit-options-t () (interactive) | |
119 | (Edit-options-modify '(lambda (var) t))) | |
120 | ||
121 | (defun Edit-options-nil () (interactive) | |
122 | (Edit-options-modify '(lambda (var) nil))) | |
123 | ||
124 | (defun Edit-options-modify (modfun) | |
125 | (save-excursion | |
9b8002ba | 126 | (let ((buffer-read-only nil) var pos) |
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127 | (re-search-backward "^;; \\|\\`") |
128 | (forward-char 3) | |
129 | (setq pos (point)) | |
130 | (save-restriction | |
131 | (narrow-to-region pos (progn (end-of-line) (1- (point)))) | |
132 | (goto-char pos) | |
133 | (setq var (read (current-buffer)))) | |
134 | (goto-char pos) | |
135 | (forward-line 1) | |
136 | (forward-char 1) | |
137 | (save-excursion | |
138 | (set var (funcall modfun var))) | |
139 | (kill-sexp 1) | |
140 | (prin1 (symbol-value var) (current-buffer))))) | |
141 | ||
6594deb0 | 142 | ;;; options.el ends here |