dotfiles/.config/emacs/kkk-lisp/kkk-windowsize.el

;;; kkk-windowsize.el --- Window Size                -*- lexical-binding: t; -*-

;; Copyright (C) 2023  Vinicius Teshima <vini.tes@pm.me>

;; Author: Vinicius Teshima <vini.tes@pm.me>

;; This program 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.

;; This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; Window Size

;;; Code:

(defgroup kkk-window nil
  "Group for the window group."
  :group 'info)

(defcustom kkk-window-size
  80
  "Size of window."
  :type 'natnum
  :group 'kkk-window)

(defun kkk-window-resize (&optional ignored)
  "This function change the size of the current window to 80 char wide.

IGNORED is there to be complient with the 'window-state-change-functions' docs."
  (interactive)
  (let ((win (selected-window)))
    (unless (or (frame-root-window-p win) (minibufferp (current-buffer)))
      (let* ((width (window-text-width))
             (delta (+ 6 (- kkk-window-size width))))
        (if (> delta 0)
            (enlarge-window-horizontally delta)
          (shrink-window-horizontally (* delta -1))
          )
        )
      )
    )
  )

(add-to-list 'window-state-change-functions #'kkk-window-resize)

(provide 'kkk-windowsize)
;;; kkk-windowsize.el ends here