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From: edgar@openmail.cc
To: help-gnu-emacs@gnu.org
Subject: How to set margins of buffer when window changes?
Date: Wed, 08 Sep 2021 17:12:22 +0000	[thread overview]
Message-ID: <20210908171222.Horde.S37YI7HmNoomvQZ1iZ9ma5I@www.vfemail.net> (raw)

Hello dear Emacs users!

I am trying to have some buffers centre the text. I figured that I  
could do it with margins. I want this to adjust depending on the value  
of `fill-column' (could be any other variable) and the width of the  
window (if it is too small, don't centre). I have the code below, but  
I get the error: `Window ... too small for splitting' (replace `...'  
with the name of the buffer's window). I added a hook to the major  
mode list of hooks, but it could be something else.

The format is very similar to what they seek here:  
[https://stackoverflow.com/q/39083118]

How can I resize the window and adjust the margins depending on  
`fill-column'? Thanks.


     (with-eval-after-load 'python
      (defun centre-text-with-margins (&optional window width)
        "Moves the left and right margins to centre the contents of  
the current buffer in the current window"
        ;; https://stackoverflow.com/a/54098261
        ;; https://stackoverflow.com/q/39083118
         ;; (if (or (> left-margin-width 0) (> right-margin-width 0))
         ;;      (progn
               (setq left-margin-width 0)
               (setq right-margin-width 0)
               ;; (set-window-buffer nil (current-buffer))
               (set-window-margins window 0 0)
               ;; ))
           (let* ((txtwidth (cond (width) (fill-column)))
                  (space (max 0 (- (window-total-width) txtwidth)))
                  (leftside (floor (/ space 2)))
                  (rightside (- space leftside)))
             (setq left-margin-width leftside)
             (setq right-margin-width rightside)
             (set-window-buffer window (current-buffer))
             (format "lm:%s rm:%s sp:%s" left-margin-width  
right-margin-width space)))
      (defun py-margins-hook ()
        (add-hook 'window-state-change-hook #'centre-text-with-margins t t))
      (add-hook 'python-mode-hook 'py-margins-hook))


Emacs:
GNU Emacs 27.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.27,  
cairo version 1.17.4) of 2021-03-26


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             reply	other threads:[~2021-09-08 17:12 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-08 17:12 edgar [this message]
2021-09-08 19:11 ` How to set margins of buffer when window changes? Joost Kremers
2021-09-08 20:57   ` edgar
2021-09-08 19:17 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-09-08 19:27   ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-09-08 19:41     ` Emanuel Berg via Users list for the GNU Emacs text editor

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