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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 free software; you can redistribute it and/or modify
7: ;; it under the terms of the GNU General Public License as published by
8: ;; the Free Software Foundation; either version 1, or (at your option)
9: ;; any later version.
10:
11: ;; GNU Emacs is distributed in the hope that it will be useful,
12: ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13: ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: ;; GNU General Public License for more details.
15:
16: ;; You should have received a copy of the GNU General Public License
17: ;; along with GNU Emacs; see the file COPYING. If not, write to
18: ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
19:
20:
21: (defun list-options ()
22: "Display a list of Emacs user options, with values and documentation."
23: (interactive)
24: (save-excursion
25: (set-buffer (get-buffer-create "*List Options*"))
26: (Edit-options-mode))
27: (with-output-to-temp-buffer "*List Options*"
28: (let (vars)
29: (mapatoms (function (lambda (sym)
30: (if (user-variable-p sym)
31: (setq vars (cons sym vars))))))
32: (setq vars (sort vars 'string-lessp))
33: (while vars
34: (let ((sym (car vars)))
35: (princ ";; ")
36: (prin1 sym)
37: (princ ":\n\t")
38: (prin1 (symbol-value sym))
39: (terpri)
40: (princ (substitute-command-keys
41: (documentation-property sym 'variable-documentation)))
42: (princ "\n;;\n"))
43: (setq vars (cdr vars))))))
44:
45: (defun edit-options ()
46: "Edit a list of Emacs user option values.
47: Selects a buffer containing such a list,
48: in which there are commands to set the option values.
49: Type \\[describe-mode] in that buffer for a list of commands."
50: (interactive)
51: (list-options)
52: (pop-to-buffer "*List Options*"))
53:
54: (defvar Edit-options-mode-map
55: (let ((map (make-keymap)))
56: (define-key map "s" 'Edit-options-set)
57: (define-key map "x" 'Edit-options-toggle)
58: (define-key map "1" 'Edit-options-t)
59: (define-key map "0" 'Edit-options-nil)
60: (define-key map "p" 'backward-paragraph)
61: (define-key map " " 'forward-paragraph)
62: (define-key map "n" 'forward-paragraph)
63: map)
64: "")
65:
66: ;; Edit Options mode is suitable only for specially formatted data.
67: (put 'Edit-options-mode 'mode-class 'special)
68:
69: (defun Edit-options-mode ()
70: "Major mode for editing Emacs user option settings.
71: Special commands are:
72: s -- set variable point points at. New value read using minibuffer.
73: x -- toggle variable, t -> nil, nil -> t.
74: 1 -- set variable to t.
75: 0 -- set variable to nil.
76: Each variable description is a paragraph.
77: For convenience, the characters p and n move back and forward by paragraphs."
78: (kill-all-local-variables)
79: (set-syntax-table emacs-lisp-mode-syntax-table)
80: (use-local-map Edit-options-mode-map)
81: (make-local-variable 'paragraph-separate)
82: (setq paragraph-separate "[^\^@-\^?]")
83: (make-local-variable 'paragraph-start)
84: (setq paragraph-start "^\t")
85: (setq truncate-lines t)
86: (setq major-mode 'Edit-options-mode)
87: (setq mode-name "Options"))
88:
89: (defun Edit-options-set () (interactive)
90: (Edit-options-modify
91: '(lambda (var) (eval-minibuffer (concat "New " (symbol-name var) ": ")))))
92:
93: (defun Edit-options-toggle () (interactive)
94: (Edit-options-modify '(lambda (var) (not (symbol-value var)))))
95:
96: (defun Edit-options-t () (interactive)
97: (Edit-options-modify '(lambda (var) t)))
98:
99: (defun Edit-options-nil () (interactive)
100: (Edit-options-modify '(lambda (var) nil)))
101:
102: (defun Edit-options-modify (modfun)
103: (save-excursion
104: (let (var pos)
105: (re-search-backward "^;; ")
106: (forward-char 3)
107: (setq pos (point))
108: (save-restriction
109: (narrow-to-region pos (progn (end-of-line) (1- (point))))
110: (goto-char pos)
111: (setq var (read (current-buffer))))
112: (goto-char pos)
113: (forward-line 1)
114: (forward-char 1)
115: (save-excursion
116: (set var (funcall modfun var)))
117: (kill-sexp 1)
118: (prin1 (symbol-value var) (current-buffer)))))
119:
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