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;;; display-fill-column-indicator.el --- interface for display-fill-column-indicator -*- lexical-binding: t -*-
;; Copyright (C) 2017-2019 Free Software Foundation, Inc.
;; Maintainer: emacs-devel@gnu.org
;; Keywords: convenience
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Provides a minor mode interface for `display-fill-column-indicator'.
;;
;; Toggle display of the column indicator with M-x
;; display-fill-column-indicator-mode. To enable the indicator in
;; all buffers, use M-x global-display-fill-column-indicator-mode.
;; NOTE: Customization variables for
;; `display-fill-column-indicator-column' and
;; `display-fill-column-indicator-char' itself are defined in
;; cus-start.el.
;;; Code:
(defgroup display-fill-column-indicator nil
"Display a fill column indicator in th buffer."
:group 'convenience
:group 'display)
;;;###autoload
(define-minor-mode display-fill-column-indicator-mode
"Toggle display fill column indicator.
This uses `display-fill-column-indicator' internally.
To change the position of the column displayed by default,
customize `display-fill-column-indicator-column' you can change the
character for the indicator setting `display-fill-column-indicator-character'."
:lighter nil
(if display-fill-column-indicator-mode
(progn
(setq display-fill-column-indicator t)
(unless display-fill-column-indicator-character
(if (and (char-displayable-p ?\u2502)
(or (not (display-graphic-p))
(eq (aref (query-font (car (internal-char-font nil ?\u2502))) 0)
(face-font 'default))))
(setq display-fill-column-indicator-character ?\u2502)
(setq display-fill-column-indicator-character ?|))))
(setq display-fill-column-indicator nil)))
(defun display-fill-column-indicator--turn-on ()
"Turn on `display-fill-column-indicator-mode'."
(unless (or (minibufferp)
(and (daemonp) (null (frame-parameter nil 'client))))
(display-fill-column-indicator-mode)))
;;;###autoload
(define-globalized-minor-mode global-display-fill-column-indicator-mode
display-fill-column-indicator-mode display-fill-column-indicator--turn-on)
(provide 'display-fill-column-indicator)
;;; display-fill-column-indicator.el ends here
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