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Most of this change is to boilerplate commentary such as license URLs. This change was prompted by ftp://ftp.gnu.org's going-away party, planned for November. Change these FTP URLs to https://ftp.gnu.org instead. Make similar changes for URLs to other organizations moving away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and fsf.org when this works, as this will further help defend against man-in-the-middle attacks (for this part I omitted the MS-DOS and MS-Windows sources and the test tarballs to keep the workload down). HTTPS is not fully working to lists.gnu.org so I left those URLs alone for now.
140 lines
4.7 KiB
EmacsLisp
140 lines
4.7 KiB
EmacsLisp
;;; options.el --- edit Options command for Emacs
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;; Copyright (C) 1985, 2001-2017 Free Software Foundation, Inc.
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;; Maintainer: emacs-devel@gnu.org
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;; Obsolete-since: 22.1
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This code provides functions to list and edit the values of all global
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;; option variables known to loaded Emacs Lisp code. There are two entry
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;; points, `list-options' and `edit' options'. The latter enters a major
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;; mode specifically for editing option values. Do `M-x describe-mode' in
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;; that context for more details.
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;; The customization buffer feature is intended to make this obsolete.
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;;; Code:
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;;;###autoload
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(defun list-options ()
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"Display a list of Emacs user options, with values and documentation.
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It is now better to use Customize instead."
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(interactive)
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(with-output-to-temp-buffer "*List Options*"
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(let (vars)
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(princ "This facility is obsolete; we recommend using M-x customize instead.")
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(mapatoms (function (lambda (sym)
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(if (custom-variable-p sym)
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(setq vars (cons sym vars))))))
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(setq vars (sort vars 'string-lessp))
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(while vars
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(let ((sym (car vars)))
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(when (boundp sym)
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(princ ";; ")
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(prin1 sym)
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(princ ":\n\t")
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(prin1 (symbol-value sym))
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(terpri)
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(princ (substitute-command-keys
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(documentation-property sym 'variable-documentation)))
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(princ "\n;;\n"))
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(setq vars (cdr vars))))
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(with-current-buffer "*List Options*"
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(Edit-options-mode)
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(setq buffer-read-only t)))))
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;;;###autoload
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(defun edit-options ()
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"Edit a list of Emacs user option values.
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Selects a buffer containing such a list,
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in which there are commands to set the option values.
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Type \\[describe-mode] in that buffer for a list of commands.
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The Custom feature is intended to make this obsolete."
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(interactive)
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(list-options)
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(pop-to-buffer "*List Options*"))
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(defvar Edit-options-mode-map
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(let ((map (make-keymap)))
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(define-key map "s" 'Edit-options-set)
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(define-key map "x" 'Edit-options-toggle)
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(define-key map "1" 'Edit-options-t)
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(define-key map "0" 'Edit-options-nil)
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(define-key map "p" 'backward-paragraph)
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(define-key map " " 'forward-paragraph)
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(define-key map "n" 'forward-paragraph)
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map)
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"")
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;; Edit Options mode is suitable only for specially formatted data.
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(put 'Edit-options-mode 'mode-class 'special)
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(define-derived-mode Edit-options-mode emacs-lisp-mode "Options"
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"\\<Edit-options-mode-map>\
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Major mode for editing Emacs user option settings.
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Special commands are:
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\\[Edit-options-set] -- set variable point points at. New value read using minibuffer.
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\\[Edit-options-toggle] -- toggle variable, t -> nil, nil -> t.
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\\[Edit-options-t] -- set variable to t.
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\\[Edit-options-nil] -- set variable to nil.
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Changed values made by these commands take effect immediately.
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Each variable description is a paragraph.
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For convenience, the characters \\[backward-paragraph] and \\[forward-paragraph] move back and forward by paragraphs."
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(setq-local paragraph-separate "[^\^@-\^?]")
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(setq-local paragraph-start "\t")
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(setq-local truncate-lines t))
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(defun Edit-options-set () (interactive)
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(Edit-options-modify
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(lambda (var) (eval-minibuffer (concat "New " (symbol-name var) ": ")))))
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(defun Edit-options-toggle () (interactive)
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(Edit-options-modify (lambda (var) (not (symbol-value var)))))
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(defun Edit-options-t () (interactive)
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(Edit-options-modify (lambda (var) t)))
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(defun Edit-options-nil () (interactive)
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(Edit-options-modify (lambda (var) nil)))
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(defun Edit-options-modify (modfun)
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(save-excursion
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(let ((buffer-read-only nil) var pos)
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(re-search-backward "^;; \\|\\`")
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(forward-char 3)
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(setq pos (point))
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(save-restriction
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(narrow-to-region pos (progn (end-of-line) (1- (point))))
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(goto-char pos)
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(setq var (read (current-buffer))))
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(goto-char pos)
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(forward-line 1)
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(forward-char 1)
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(save-excursion
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(set var (funcall modfun var)))
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(kill-sexp 1)
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(prin1 (symbol-value var) (current-buffer)))))
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(provide 'options)
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;;; options.el ends here
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