Split Emacs window with certain ratio

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Emacs window with certain ratio :en:emacs:

The idea comes from yangdaweihit. Here is the implementation.

(defvar my-ratio-dict
  '((1 . 1.61803398875)
    (2 . 2)
    (3 . 3)
    (4 . 4)
    (5 . 0.61803398875))
  "The ratio dictionary.")

(defun my-split-window-horizontally (&optional ratio)
  "Split window horizontally and resize the new window.
Always focus bigger window."
  (interactive "P")
  (let* (ratio-val)
    (cond
     (ratio
      (setq ratio-val (cdr (assoc ratio my-ratio-dict)))
      (split-window-horizontally (floor (/ (window-body-width)
                                           (1+ ratio-val)))))
     (t
      (split-window-horizontally)))
    (set-window-buffer (next-window) (other-buffer))
    (if (or (not ratio-val)
            (>= ratio-val 1))
        (windmove-right))))

(defun my-split-window-vertically (&optional ratio)
  "Split window vertically and resize the new window.
Always focus bigger window."
  (interactive "P")
  (let* (ratio-val)
    (cond
     (ratio
      (setq ratio-val (cdr (assoc ratio my-ratio-dict)))
      (split-window-vertically (floor (/ (window-body-height)
                                         (1+ ratio-val)))))
     (t
      (split-window-vertically)))
    ;; open another window with other-buffer
    (set-window-buffer (next-window) (other-buffer))
    ;; move focus if new window bigger than current one
    (if (or (not ratio-val)
            (>= ratio-val 1))
        (windmove-down))))

(global-set-key (kbd "C-x 2") 'my-split-window-vertically)
(global-set-key (kbd "C-x 3") 'my-split-window-horizontally)

Usage is simple. For example, C-x 2 is similar to original split-winddow-vertically while C-u 1 C-x 2 split the window in golden ratio.

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