summaryrefslogtreecommitdiff
path: root/lisp/options.el
diff options
context:
space:
mode:
authorRaul Acevedo <kitaro@gnu.org>1991-04-05 21:11:22 +0000
committerRaul Acevedo <kitaro@gnu.org>1991-04-05 21:11:22 +0000
commitba308b42aaa9df4a0430c6df85dca9d46aee18f8 (patch)
treef41d707eeea8e540e8203e98b2c6351b95fe7993 /lisp/options.el
parentbaec1836ede8689ed0f1d708692aa2f2a5c1cc9c (diff)
downloademacs-ba308b42aaa9df4a0430c6df85dca9d46aee18f8.tar.gz
Initial revision
Diffstat (limited to 'lisp/options.el')
-rw-r--r--lisp/options.el122
1 files changed, 122 insertions, 0 deletions
diff --git a/lisp/options.el b/lisp/options.el
new file mode 100644
index 00000000000..b30dc004c1c
--- /dev/null
+++ b/lisp/options.el
@@ -0,0 +1,122 @@
+;; Edit Options command for Emacs.
+;; Copyright (C) 1985 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 1, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING. If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+(defun list-options ()
+ "Display a list of Emacs user options, with values and documentation."
+ (interactive)
+ (save-excursion
+ (set-buffer (get-buffer-create "*List Options*"))
+ (Edit-options-mode))
+ (with-output-to-temp-buffer "*List Options*"
+ (let (vars)
+ (mapatoms (function (lambda (sym)
+ (if (user-variable-p sym)
+ (setq vars (cons sym vars))))))
+ (setq vars (sort vars 'string-lessp))
+ (while vars
+ (let ((sym (car vars)))
+ (princ ";; ")
+ (prin1 sym)
+ (princ ":\n\t")
+ (prin1 (symbol-value sym))
+ (terpri)
+ (princ (substitute-command-keys
+ (documentation-property sym 'variable-documentation)))
+ (princ "\n;;\n"))
+ (setq vars (cdr vars))))))
+
+(defun edit-options ()
+ "Edit a list of Emacs user option values.
+Selects a buffer containing such a list,
+in which there are commands to set the option values.
+Type \\[describe-mode] in that buffer for a list of commands."
+ (interactive)
+ (list-options)
+ (pop-to-buffer "*List Options*"))
+
+(defvar Edit-options-mode-map
+ (let ((map (make-keymap)))
+ (define-key map "s" 'Edit-options-set)
+ (define-key map "x" 'Edit-options-toggle)
+ (define-key map "1" 'Edit-options-t)
+ (define-key map "0" 'Edit-options-nil)
+ (define-key map "p" 'backward-paragraph)
+ (define-key map " " 'forward-paragraph)
+ (define-key map "n" 'forward-paragraph)
+ map)
+ "")
+
+;; Edit Options mode is suitable only for specially formatted data.
+(put 'Edit-options-mode 'mode-class 'special)
+
+(defun Edit-options-mode ()
+ "Major mode for editing Emacs user option settings.
+Special commands are:
+s -- set variable point points at. New value read using minibuffer.
+x -- toggle variable, t -> nil, nil -> t.
+1 -- set variable to t.
+0 -- set variable to nil.
+Changed values made by these commands take effect immediately.
+
+Each variable description is a paragraph.
+For convenience, the characters p and n move back and forward by paragraphs."
+ (kill-all-local-variables)
+ (set-syntax-table emacs-lisp-mode-syntax-table)
+ (use-local-map Edit-options-mode-map)
+ (make-local-variable 'paragraph-separate)
+ (setq paragraph-separate "[^\^@-\^?]")
+ (make-local-variable 'paragraph-start)
+ (setq paragraph-start "^\t")
+ (setq truncate-lines t)
+ (setq major-mode 'Edit-options-mode)
+ (setq mode-name "Options")
+ (run-hooks 'Edit-options-mode-hook))
+
+(defun Edit-options-set () (interactive)
+ (Edit-options-modify
+ '(lambda (var) (eval-minibuffer (concat "New " (symbol-name var) ": ")))))
+
+(defun Edit-options-toggle () (interactive)
+ (Edit-options-modify '(lambda (var) (not (symbol-value var)))))
+
+(defun Edit-options-t () (interactive)
+ (Edit-options-modify '(lambda (var) t)))
+
+(defun Edit-options-nil () (interactive)
+ (Edit-options-modify '(lambda (var) nil)))
+
+(defun Edit-options-modify (modfun)
+ (save-excursion
+ (let (var pos)
+ (re-search-backward "^;; \\|\\`")
+ (forward-char 3)
+ (setq pos (point))
+ (save-restriction
+ (narrow-to-region pos (progn (end-of-line) (1- (point))))
+ (goto-char pos)
+ (setq var (read (current-buffer))))
+ (goto-char pos)
+ (forward-line 1)
+ (forward-char 1)
+ (save-excursion
+ (set var (funcall modfun var)))
+ (kill-sexp 1)
+ (prin1 (symbol-value var) (current-buffer)))))
+