Scieneer Common Lisp 1.3.9 online documentation

pprint-tab kind colnum colinc &optional stream[Function]

If stream, which defaults to *standard-output*, is a pretty-printing stream and *print-pretty* is true, perform tabbing based on kind, otherwise do nothing. The kind can be one of:

:line
Tab to column colnum. If already past colnum then tab to the next multiple of colinc.
:section
Same as :line, but count from the start of the current section, not the start of the line.
:line-relative
Output colnum spaces, then tab to the next multiple of colinc.
:section-relative
Same as :line-relative, but count from the start of the current section, not the start of the line.