SWI-Prolog -- apropos/1

Documentation
- Reference manual
  - Overview
    - Online Help
      - library(help): Text based manual
        
        help/0
        
        help/1
        
        show_html_hook/1
        
        apropos/1
        
        help_text/2
- Packages

Availability::- use_module(library(help)).(can be autoloaded)

[det]apropos(+Query)

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.