How to show more of the buffer in the current window?

Question

Sometimes I have the current buffer in the current window displayed sub-optimally: there is a lot of buffer not shown, and there is a lot of empty space at the bottom below the EOB. E.g.:

• the buffer is 100 lines
• the window is 10 lines
• the point is on the line 3 of the window
• EOB is on the line 5 of the window

so that the bottom 5 lines of the window are empty and the first 95 lines of the buffer are not shown.

I want a function that would "move the window 5 lines up along the buffer" so that

• the EOB is on the bottom line of the window
• the last 10 lines of the buffer are shown
• the point is on the line 8(=3+5) or the window, the value of (point) did not change

Note:

• I do not want the point to move
• I do not want to change window configuration
• I do not want to change the current window size

I am pretty sure something like that exists already, I just cannot figure out how to find it.

Edit:

Apparently, I need something like this:

(defun sds-improve-window-utilization ()
  "Ensure that there is no empty space below EOB in the current window"
  (interactive)
  (when-let ((w (selected-window))
             (eob-pos (cadr (pos-visible-in-window-p (point-max) w t)))
             (point (cadr (pos-visible-in-window-p (point) w t)))
             (height-c (window-total-height w))
             (height-p (window-pixel-height w)))
    (recenter (/ (- point eob-pos) (/ height-p height-c)))))

I wonder, again, if something like that already exists...

Answer 1

Use recenter-top-bottom, normally bound to C-l.