Some Prolog constructs, such as if-then-else constructs, have a conventional layout in which each goal starts at the fourth column after the beginning of the opening parenthesis or operator. For example:
( if -> then ; else *-> elif ; true )
To help you in maintaining the desired layout without having to
manually count spaces, Sweep provides the command
sweeprolog-align-spaces that updates the whitespace around
point such that the next token is aligned to a (multiple of) four
columns from the start of the previous token. Sweep also provides a
dedicated minor mode sweeprolog-electric-layout-mode that
adjusts whitespace around point automatically as you type
(Electric Layout mode).