4c35618044
Since there are early versions of Emacs [26.0, 26.1) that don't have the new line numbers library.
93 lines
3.6 KiB
EmacsLisp
93 lines
3.6 KiB
EmacsLisp
;;; core/autoload/line-numbers.el -*- lexical-binding: t; -*-
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;;;###if (version< emacs-version "26.1")
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;; This was lifted out of the display-line-numbers library in Emacs 26.1 and
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;; modified to use nlinum for Emacs 25.x users. It should be removed should
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;; Emacs 25 support be removed.
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;;;###autoload
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(defvar display-line-numbers t
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"Non-nil means display line numbers.
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If the value is t, display the absolute number of each line of a buffer
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shown in a window. Absolute line numbers count from the beginning of
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the current narrowing, or from buffer beginning. If the value is
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relative, display for each line not containing the window's point its
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relative number instead, i.e. the number of the line relative to the
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line showing the window's point.
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In either case, line numbers are displayed at the beginning of each
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non-continuation line that displays buffer text, i.e. after each newline
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character that comes from the buffer. The value visual is like
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relative but counts screen lines instead of buffer lines. In practice
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this means that continuation lines count as well when calculating the
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relative number of a line.
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Lisp programs can disable display of a line number of a particular
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buffer line by putting the display-line-numbers-disable text property
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or overlay property on the first visible character of that line.")
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(defgroup display-line-numbers nil "Display line number preferences"
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:group 'emacs)
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;;;###autoload
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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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: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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;;;###autoload
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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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:type 'boolean)
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;;;###autoload
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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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:type 'boolean)
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;;;###autoload
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(defun line-number-display-width ()
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"Return the width used for displaying line numbers in the
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selected window."
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(length (save-excursion (goto-char (point-max))
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(format-mode-line "%l"))))
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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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(cond ((null display-line-numbers-type))
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((eq display-line-numbers-type 'relative)
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(if display-line-numbers-mode
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(nlinum-relative-off)
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(nlinum-relative-on)))
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((nlinum-mode (if display-line-numbers-mode +1 -1)))))
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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 (or (minibufferp)
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;; taken from linum.el
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(and (daemonp) (null (frame-parameter nil 'client))))
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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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