1

What is an easy way to automatically resize a window (height and or width) according to the length / line length of the buffer?

Possible behavior: A frame split horizontally with two windows with the right-hand buffer set to automatically resize to a minimum width that minimizes wrapped lines. A maximum width might be specified and occasionally force some lines to be wrapped.

2

The command fit-window-to-buffer resizes a window, so you can type M-x fit-window-to-buffer RET to resize the current buffer's window. By default fit-window-to-buffer only resizes vertically (according to height), but you can use the variable fit-window-to-buffer-horizontally to change that: - nil (the default): only resize vertically - only: only resize horizontally (according to width) - other value: both vertical and horizontal resizing is allowed

To resize a window programatically, you can call fit-window-to-buffer or hook it into appropriate places, depending on what you want to do exactly. Here are some helper functions that might be easier to use:

(defun fit-window-to-buffer-width (&optional window max-width min-width)
  "Fit WINDOW according to its buffer's width.
WINDOW, MAX-WIDTH and MIN-WIDTH have the same meaning as in
`fit-window-to-buffer'."
  (interactive)
  (let ((fit-window-to-buffer-horizontally 'only))
    (fit-window-to-buffer window nil nil max-width min-width)))

(defun fit-window-to-buffer-height (&optional window max-height min-height)
  "Fit WINDOW according to its buffer's height.
WINDOW, MAX-HEIGHT and MIN-HEIGHT have the same meaning as in
`fit-window-to-buffer'."
  (interactive)
  (let ((fit-window-to-buffer-horizontally nil))
    (fit-window-to-buffer window max-height min-height nil nil)))

(defun fit-window-to-buffer-height-or-width
    (&optional window max-height min-height max-width min-width)
  "Fit WINDOW according to its buffer's height and width.
WINDOW, MAX-HEIGHT, MIN-HEIGHT, MAX-WIDTH and MIN-WIDTH have the same meaning
as in `fit-window-to-buffer'."
  (interactive)
  (let ((fit-window-to-buffer-horizontally t))
    (fit-window-to-buffer window max-height min-height max-width min-width)))

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