From 6a60bd475d67b7e8c9184836abf7eea229183066 Mon Sep 17 00:00:00 2001 From: Lars Ingebrigtsen Date: Wed, 1 Dec 2021 16:53:00 +0100 Subject: Add a new minor mode `glyphless-display-mode' * doc/emacs/display.texi (Text Display): Mention it. * doc/lispref/display.texi (Glyphless Chars): Document it. * lisp/textmodes/glyphless-mode.el: New minor mode (bug#27544). --- lisp/textmodes/glyphless-mode.el | 67 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 lisp/textmodes/glyphless-mode.el (limited to 'lisp/textmodes/glyphless-mode.el') diff --git a/lisp/textmodes/glyphless-mode.el b/lisp/textmodes/glyphless-mode.el new file mode 100644 index 00000000000..3aeb360084a --- /dev/null +++ b/lisp/textmodes/glyphless-mode.el @@ -0,0 +1,67 @@ +;;; glyphless-mode.el --- minor mode for displaying glyphless characters -*- lexical-binding: t; -*- + +;; Copyright (C) 2021 Free Software Foundation, Inc. + +;; Maintainer: emacs-devel@gnu.org + +;; 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 3 of the License, 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. If not, see . + +;;; Commentary: + +;;; Code: + +(defcustom glyphless-mode-types '(all) + "Which glyphless characters to display. +The value can be any of the groups supported by +`glyphless-char-display-control' (which see), and in addition +`all', for all glyphless characters." + :version "29.1" + :type '(repeat (choice (const :tag "All" all) + (const :tag "No font" no-font) + (const :tag "C0 Control" c0-control) + (const :tag "C1 Control" c1-control) + (const :tag "Format Control" format-control) + (const :tag "Variation Selectors" variation-selectors) + (const :tag "No Font" no-font))) + :group 'display) + +;;;###autoload +(define-minor-mode glyphless-display-mode + "Minor mode for displaying glyphless characters in the current buffer. +If enabled, all glyphless characters will be displayed as boxes +that display their acronyms." + :lighter " Glyphless" + (if glyphless-display-mode + (progn + (setq-local glyphless-char-display + (let ((table (make-display-table))) + (set-char-table-parent table glyphless-char-display) + table)) + (glyphless-mode--setup)) + (kill-local-variable 'glyphless-char-display))) + +(defun glyphless-mode--setup () + (let ((types (if (memq 'all glyphless-mode-types) + '(c0-control c1-control format-control + variation-selectors no-font) + glyphless-mode-types))) + (when types + (update-glyphless-char-display + nil (mapcar (lambda (e) (cons e 'acronym)) types))))) + +(provide 'glyphless-mode) + +;;; glyphless-mode.el ends here -- cgit v1.2.3