Similar to this question, but instead of adding a new line to the end of the prompt, add a new line to the beginning of the long command (when a command reaches to the right side of the command line window).
I believe I saw such behavior in fish as shown in this video. It only adds newline to the line containing the prompt.
I'm using zsh (v5.8) on Linux (kernel: v5.10)
Edit:
How can I implement such behavior in zsh or bash?
In zsh, you could do something like:
zle-line-pre-redraw() { (( BUFFERLINES == 1 + ${#BUFFER//[^$'\n']} )) || PREDISPLAY=$'\n' } zle -N zle-line-pre-redraw Which prepends a newline if the number of lines to display to render the buffer is greater than the number of newline characters plus 1 (meaning at least one line overflowed or PREDISPLAY was already set to newline for that buffer).
$BUFFERLINES contains the number of lines / rows needed to display the editing buffer. It starts at 1, if you enter a line long enough so as to wrap, it will be 2. It would also be 2 if you enter a literal newline character in the buffer (with Esc Enter or Ctrl-V Ctrl-J) so we take that into account.