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1.1 root 1: ;; Edit Options command for Emacs.
2: ;; Copyright (C) 1985 Free Software Foundation, Inc.
3:
4: ;; This file is part of GNU Emacs.
5:
6: ;; GNU Emacs is distributed in the hope that it will be useful,
7: ;; but WITHOUT ANY WARRANTY. No author or distributor
8: ;; accepts responsibility to anyone for the consequences of using it
9: ;; or for whether it serves any particular purpose or works at all,
10: ;; unless he says so in writing. Refer to the GNU Emacs General Public
11: ;; License for full details.
12:
13: ;; Everyone is granted permission to copy, modify and redistribute
14: ;; GNU Emacs, but only under the conditions described in the
15: ;; GNU Emacs General Public License. A copy of this license is
16: ;; supposed to have been given to you along with GNU Emacs so you
17: ;; can know your rights and responsibilities. It should be in a
18: ;; file named COPYING. Among other things, the copyright notice
19: ;; and this notice must be preserved on all copies.
20:
21:
22: (defun list-options ()
23: "Display a list of Emacs user options, with values and documentation."
24: (interactive)
25: (save-excursion
26: (set-buffer (get-buffer-create "*List Options*"))
27: (Edit-options-mode))
28: (with-output-to-temp-buffer "*List Options*"
29: (let (vars)
30: (mapatoms (function (lambda (sym)
31: (if (user-variable-p sym)
32: (setq vars (cons sym vars))))))
33: (setq vars (sort vars 'string-lessp))
34: (while vars
35: (let ((sym (car vars)))
36: (princ ";; ")
37: (prin1 sym)
38: (princ ":\n\t")
39: (prin1 (symbol-value sym))
40: (terpri)
41: (princ (substitute-command-keys
42: (documentation-property sym 'variable-documentation)))
43: (princ "\n;;\n"))
44: (setq vars (cdr vars))))))
45:
46: (defun edit-options ()
47: "Edit a list of Emacs user option values.
48: Selects a buffer containing such a list,
49: in which there are commands to set the option values.
50: Type \\[describe-mode] in that buffer for a list of commands."
51: (interactive)
52: (list-options)
53: (pop-to-buffer "*List Options*"))
54:
55: (defvar Edit-options-mode-map
56: (let ((map (make-keymap)))
57: (define-key map "s" 'Edit-options-set)
58: (define-key map "x" 'Edit-options-toggle)
59: (define-key map "1" 'Edit-options-t)
60: (define-key map "0" 'Edit-options-nil)
61: (define-key map "p" 'backward-paragraph)
62: (define-key map " " 'forward-paragraph)
63: (define-key map "n" 'forward-paragraph)
64: map)
65: "")
66:
67: ;; Edit Options mode is suitable only for specially formatted data.
68: (put 'Edit-options-mode 'mode-class 'special)
69:
70: (defun Edit-options-mode ()
71: "Major mode for editing Emacs user option settings.
72: Special commands are:
73: s -- set variable point points at. New value read using minibuffer.
74: x -- toggle variable, t -> nil, nil -> t.
75: 1 -- set variable to t.
76: 0 -- set variable to nil.
77: Each variable description is a paragraph.
78: For convenience, the characters p and n move back and forward by paragraphs."
79: (kill-all-local-variables)
80: (set-syntax-table emacs-lisp-mode-syntax-table)
81: (use-local-map Edit-options-mode-map)
82: (make-local-variable 'paragraph-separate)
83: (setq paragraph-separate "[^\^@-\^?]")
84: (make-local-variable 'paragraph-start)
85: (setq paragraph-start "^\t")
86: (setq truncate-lines t)
87: (setq major-mode 'Edit-options-mode)
88: (setq mode-name "Options"))
89:
90: (defun Edit-options-set () (interactive)
91: (Edit-options-modify
92: '(lambda (var) (eval-minibuffer (concat "New " (symbol-name var) ": ")))))
93:
94: (defun Edit-options-toggle () (interactive)
95: (Edit-options-modify '(lambda (var) (not (symbol-value var)))))
96:
97: (defun Edit-options-t () (interactive)
98: (Edit-options-modify '(lambda (var) t)))
99:
100: (defun Edit-options-nil () (interactive)
101: (Edit-options-modify '(lambda (var) nil)))
102:
103: (defun Edit-options-modify (modfun)
104: (save-excursion
105: (let (var pos)
106: (re-search-backward "^;; ")
107: (forward-char 3)
108: (setq pos (point))
109: (save-restriction
110: (narrow-to-region pos (progn (end-of-line) (1- (point))))
111: (goto-char pos)
112: (setq var (read (current-buffer))))
113: (goto-char pos)
114: (forward-line 1)
115: (forward-char 1)
116: (save-excursion
117: (set var (funcall modfun var)))
118: (kill-sexp 1)
119: (prin1 (symbol-value var) (current-buffer)))))
120:
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