prolog_help:apropos/1

swipl
- library

apropos(+Query) is det

Print objects from the manual whose name or summary match with Query. Query takes one of the following forms:

Type:Text

Find objects matching Text and filter the results by Type. Type matching is a case intensitive prefix match. Defined types are section, cfunction, function, iso_predicate, swi_builtin_predicate, library_predicate, dcg and aliases chapter, arithmetic, c_function, predicate, nonterminal and non_terminal. For example:

?- apropos(c:close).
?- apropos(f:min).

Text

Text is broken into tokens. A topic matches if all tokens appear in the name or summary of the topic. Matching is case insensitive. Results are ordered depending on the quality of the match.