Jade Manual - Line Movement

Function: next-line &optional count pos

Alter and return pos (or a copy of the cursor position) so that it points count (or one) lines forwards, the column component is not changed.

If count is negative (i.e. go backwards) and the resulting line number is less than zero nil is returned.

(next-line 2 (pos 1 1))
    => #<pos 1 3>

(next-line -1 (pos 1 1))
    => #<pos 1 0>

Function: goto-next-line &optional count: Move count lines downwards, the column number of the cursor is adjusted so that its glyph position is as close to its previous glyph position as possible.

Function: prev-line &optional count pos: Similar to next-line but goes backwards (or forwards with a negative count).

Function: goto-prev-line &optional count: Move count lines backwards, adjusting the column number of the cursor as necessary.