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69 lines
2.6 KiB
EmacsLisp
69 lines
2.6 KiB
EmacsLisp
;;; glyphless-mode.el --- minor mode for displaying glyphless characters -*- lexical-binding: t; -*-
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;; Copyright (C) 2021-2022 Free Software Foundation, Inc.
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;; Maintainer: emacs-devel@gnu.org
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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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;;; Code:
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(defcustom glyphless-mode-types '(all)
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"Which glyphless characters to display.
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The value can be any of the groups supported by
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`glyphless-char-display-control' (which see), and in addition
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`all', for all glyphless characters."
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:version "29.1"
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:type '(repeat (choice (const :tag "All" all)
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(const :tag "No font" no-font)
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(const :tag "C0 Control" c0-control)
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(const :tag "C1 Control" c1-control)
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(const :tag "Format Control" format-control)
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(const :tag "Bidirectional Control" bidi-control)
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(const :tag "Variation Selectors" variation-selectors)
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(const :tag "No Font" no-font)))
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:group 'display)
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;;;###autoload
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(define-minor-mode glyphless-display-mode
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"Minor mode for displaying glyphless characters in the current buffer.
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If enabled, all glyphless characters will be displayed as boxes
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that display their acronyms."
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:lighter " Glyphless"
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(if glyphless-display-mode
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(progn
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(setq-local glyphless-char-display
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(let ((table (make-display-table)))
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(set-char-table-parent table glyphless-char-display)
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table))
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(glyphless-mode--setup))
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(kill-local-variable 'glyphless-char-display)))
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(defun glyphless-mode--setup ()
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(let ((types (if (memq 'all glyphless-mode-types)
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'(c0-control c1-control format-control
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variation-selectors no-font)
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glyphless-mode-types)))
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(when types
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(update-glyphless-char-display
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nil (mapcar (lambda (e) (cons e 'acronym)) types)))))
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(provide 'glyphless-mode)
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;;; glyphless-mode.el ends here
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