When opening 2 files in emacs, how can I have them appear side-by-side?

user_399397 0
Viewed 18823

Sometimes I launch emacs from the command line with 2 files, as follows:

emacs foo.txt bar.txt

This opens the emacs window, split vertically:

foo.txt
-------
bar.txt

How can I edit my .emacs file so that they show up side-by-side, like this?:

        |
foo.txt | bar.txt
        |

EDIT: To clarify, I know how to make this happen after emacs has launched (M-x 0, M-x 3, then re-visit bar.txt in the right window). I just want emacs to split side-by-side by default when I launch it, so I don't have to.

dot-emacs emacs
7 Answers
;; 15-Oct-20  open first file in left window
(defun my-startup-layout ()
  (let ((buffers (mapcar 'window-buffer (window-list))))
    (when (= 2 (length buffers))
      (delete-other-windows)
      (set-window-buffer (split-window-horizontally) (cadr buffers))))
)

(add-hook 'emacs-startup-hook 'my-startup-layout)
(add-hook 'emacs-startup-hook 'next-multiframe-window)
;; end of customization to open first file on left
;;
user_144587750
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