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105 lines
3.8 KiB
EmacsLisp
105 lines
3.8 KiB
EmacsLisp
;;; display-line-numbers.el --- interface for display-line-numbers -*- lexical-binding: t -*-
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;; Copyright (C) 2017-2020 Free Software Foundation, Inc.
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: convenience
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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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;; Provides a minor mode interface for `display-line-numbers'.
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;;
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;; Toggle display of line numbers with M-x display-line-numbers-mode.
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;; To enable line numbering in all buffers, use M-x
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;; global-display-line-numbers-mode. To change the default type of
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;; line numbers displayed, customize display-line-numbers-type.
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;; NOTE: Customization variables for `display-line-numbers' itself are
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;; defined in cus-start.el.
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;;; Code:
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(defgroup display-line-numbers nil
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"Display line numbers in the buffer."
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:group 'convenience
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:group 'display)
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(defcustom display-line-numbers-type t
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"The default type of line numbers to use in `display-line-numbers-mode'.
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See `display-line-numbers' for value options."
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:group 'display-line-numbers
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:type '(choice (const :tag "Relative line numbers" relative)
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(const :tag "Relative visual line numbers" visual)
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(other :tag "Absolute line numbers" t))
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:version "26.1")
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(defcustom display-line-numbers-grow-only nil
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"If non-nil, do not shrink line number width."
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:group 'display-line-numbers
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:type 'boolean
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:version "26.1")
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(defcustom display-line-numbers-width-start nil
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"If non-nil, count number of lines to use for line number width.
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When `display-line-numbers-mode' is turned on,
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`display-line-numbers-width' is set to the minimum width necessary
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to display all line numbers in the buffer."
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:group 'display-line-numbers
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:type 'boolean
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:version "26.1")
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(defun display-line-numbers-update-width ()
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"Prevent the line number width from shrinking."
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(let ((width (line-number-display-width)))
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(when (> width (or display-line-numbers-width 1))
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(setq display-line-numbers-width width))))
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;;;###autoload
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(define-minor-mode display-line-numbers-mode
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"Toggle display of line numbers in the buffer.
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This uses `display-line-numbers' internally.
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To change the type of line numbers displayed by default,
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customize `display-line-numbers-type'. To change the type while
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the mode is on, set `display-line-numbers' directly."
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:lighter nil
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(if display-line-numbers-mode
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(progn
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(when display-line-numbers-width-start
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(setq display-line-numbers-width
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(length (number-to-string
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(count-lines (point-min) (point-max))))))
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(when display-line-numbers-grow-only
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(add-hook 'pre-command-hook #'display-line-numbers-update-width nil t))
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(setq display-line-numbers display-line-numbers-type))
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(remove-hook 'pre-command-hook #'display-line-numbers-update-width t)
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(setq display-line-numbers nil)))
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(defun display-line-numbers--turn-on ()
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"Turn on `display-line-numbers-mode'."
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(unless (minibufferp)
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(display-line-numbers-mode)))
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;;;###autoload
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(define-globalized-minor-mode global-display-line-numbers-mode
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display-line-numbers-mode display-line-numbers--turn-on)
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(provide 'display-line-numbers)
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;;; display-line-numbers.el ends here
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