The result of window-body-width doesn't change when display-line-number-mode is enabled / disabled.
How can I get the window width but excluding the fringe?
2 Answers
The function window-max-chars-per-line does exactly this.
Found in the emacs manual: the effective width of the window in characters.
For e.g., its return value does change based on whether or not line numbers are enabled in the current buffer. It can do this for any face via an optional argument.
If I understand you right, this might do it (size in pixels):
(defun window-pixel-width-minus-fringe ()
(let ((width (window-pixel-width))
(fringes (window-fringes)))
(- width (+ (car fringes) (cadr fringes)))))
See the Elisp manual, nodes Window Sizes and Fringe Size and Position.
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The result of the function
(window-fringes)doesn't change when displaying line number is toggled:(global-display-line-numbers-mode)Commented Feb 14, 2022 at 5:40 -
Line numbers are not part of the window width. See Window Total Width at Window Sizes. And that's exactly what you asked for: "the width of the window without line numbers".– DrewCommented Feb 14, 2022 at 18:54
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Of course
window-fringesdoesn't change according to whether line numbers are displayed. Fringes have nothing to do with line numbers.– DrewCommented Feb 14, 2022 at 18:55
display-line-number-mode, and notline-number-mode. The latter just puts the line number in the mode-line.linum-modeandnlinum-modeused the left of the fringe, which is different than the current built-in version.xdisp.c, at the line that reads:strcat (lnum_buf, " ");I haven't played with the internals for a few years now, but my recollection is that there were some geometry functions written for users to call from lisp to obtain additional values that were not previously available in earlier versions of Emacs.