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Re: First split horizontally, and then vertically

From: Jorge A. Alfaro-Murillo
Subject: Re: First split horizontally, and then vertically
Date: Wed, 12 Aug 2015 12:45:42 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

Alexander Shukaev writes:

which values should I put into
(setq-default split-width-threshold  ?)
(setq-default split-height-threshold ?)
so that Emacs first splits windows horizontally (until the limit) and only then splits them vertically.
I also prefer vertical splitting, I have it set up so that no windows are split horizontally unless I do it myself:
#+BEGIN_SRC emacs-lisp
 (setq split-height-threshold nil)
 (setq split-width-threshold 150)

You can also try setting split-height-threshold to 0, to make a vertical split more likely than a horizontal one.

That's the problem. I've tried this already, and as soon as I have some integer (0, for example) in `split-height-threshold' the first split by `split-window-sensibly' is vertical one

I think the problem is the way that split-window-sensibly works, it first checks if the window is at least split-height-threshold lines tall, if it is then it splits horizontally, if it is not then it checks if the window is at least split-width-threshold columns wide to split vertically. You want the opposite to happen.

You should look at the code of split-window-sensibly and make your own function, one that first checks split-width-threshold. Then you should set split-window-preferred-function to that function. This is not tested but could work:

#+BEGIN_SRC emacs-lisp
(defun split-window-more-sensibly (&optional window)
 (let ((window (or window (selected-window))))
   (or (and (window-splittable-p window t)
             ;; Split window horizontally.
             (with-selected-window window
        (and (window-splittable-p window)
             ;; Split window vertically.
             (with-selected-window window
        (and (eq window (frame-root-window (window-frame window)))
             (not (window-minibuffer-p window))
;; If WINDOW is the only window on its frame and is not the
             ;; minibuffer window, try to split it vertically
;; disregarding the value of `split-height-threshold'. (let ((split-height-threshold 0)) (when (window-splittable-p window)
                 (with-selected-window window

(setq split-window-preferred-function 'split-window-more-sensibly)


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