/usr/lib/swipl/library/help.pl
All Application Manual Name SummaryHelp

  • swipl
    • library
      • error.pl
      • debug.pl -- Print debug messages and test assertions
      • apply.pl -- Apply predicates on a list
      • lists.pl -- List Manipulation
      • broadcast.pl -- Event service
      • shlib.pl -- Utility library for loading foreign objects (DLLs, shared objects)
      • option.pl -- Option list processing
      • thread_pool.pl -- Resource bounded thread management
      • gensym.pl -- Generate unique symbols
      • settings.pl -- Setting management
      • arithmetic.pl -- Extensible arithmetic
      • main.pl -- Provide entry point for scripts
      • readutil.pl -- Read utilities
      • operators.pl -- Manage operators
      • pairs.pl -- Operations on key-value lists
      • prolog_source.pl -- Examine Prolog source-files
      • record.pl -- Access compound arguments by name
      • quasi_quotations.pl -- Define Quasi Quotation syntax
      • sandbox.pl
      • apply_macros.pl -- Goal expansion rules to avoid meta-calling
      • yall.pl -- Lambda expressions
      • assoc.pl -- Binary associations
      • prolog_format.pl -- Analyse format specifications
      • pure_input.pl -- Pure Input from files and streams
      • solution_sequences.pl -- Modify solution sequences
      • ordsets.pl -- Ordered set manipulation
      • random.pl -- Random numbers
      • base64.pl -- Base64 encoding and decoding
      • aggregate.pl -- Aggregation operators on backtrackable predicates
      • predicate_options.pl -- Access and analyse predicate options
      • csv.pl -- Process CSV (Comma-Separated Values) data
      • pprint.pl -- Pretty Print Prolog terms
      • atom.pl -- Operations on atoms
      • modules.pl -- Module utility predicates
      • occurs.pl -- Finding and counting sub-terms
      • prolog_xref.pl -- Prolog cross-referencer data collection
      • prolog_colour.pl -- Prolog syntax colouring support.
      • lazy_lists.pl -- Lazy list handling
      • ugraphs.pl -- Graph manipulation library
      • url.pl -- Analysing and constructing URL
      • www_browser.pl -- Open a URL in the users browser
      • prolog_pack.pl -- A package manager for Prolog
      • git.pl -- Run GIT commands
      • utf8.pl -- UTF-8 encoding/decoding on lists of character codes.
      • quintus.pl -- Quintus compatibility
      • prolog_versions.pl -- Demand specific (Prolog) versions
      • prolog_wrap.pl -- Wrapping predicates
      • dialect.pl -- Support multiple Prolog dialects
      • date.pl -- Process dates and times
      • persistency.pl -- Provide persistent dynamic predicates
      • iostream.pl -- Utilities to deal with streams
      • prolog_code.pl -- Utilities for reasoning about code
      • strings.pl -- String utilities
      • dif.pl -- The dif/2 constraint
      • edinburgh.pl -- Some traditional Edinburgh predicates
      • terms.pl -- Term manipulation
      • ansi_term.pl -- Print decorated text to ANSI consoles
      • threadutil.pl -- Interactive thread utilities
      • prolog_stack.pl -- Examine the Prolog stack
      • prolog_clause.pl
      • prolog_breakpoints.pl -- Manage Prolog break-points
      • wfs.pl -- Well Founded Semantics interface
      • sort.pl
      • dicts.pl -- Dict utilities
      • varnumbers.pl -- Utilities for numbered terms
      • rbtrees.pl -- Red black trees
      • backcomp.pl -- Backward compatibility
      • charsio.pl -- I/O on Lists of Character Codes
      • shell.pl -- Elementary shell commands
      • base32.pl -- Base32 encoding and decoding
      • codesio.pl -- I/O on Lists of Character Codes
      • coinduction.pl -- Co-Logic Programming
      • heaps.pl -- heaps/priority queues
      • statistics.pl -- Get information about resource usage
      • when.pl -- Conditional coroutining
      • ctypes.pl -- Character code classification
      • optparse.pl -- command line parsing
      • prolog_debug.pl -- User level debugging tools
      • listing.pl -- List programs and pretty print clauses
      • make.pl -- Reload modified source files
      • qsave.pl
      • exceptions.pl
      • increval.pl -- Incremental dynamic predicate modification
      • tables.pl -- XSB interface to tables
      • writef.pl -- Old-style formatted write
      • prolog_profile.pl -- Execution profiler
      • zip.pl -- Access resource ZIP archives
      • help.pl -- Text based manual
        • tty_link_hook/2
        • help/0
        • help/1
        • show_html_hook/1
        • apropos/1
        • apropos/2
        • help_apropos/4
        • help_text/2
      • check.pl -- Consistency checking
      • edit.pl
      • prolog_coverage.pl -- Coverage analysis tool
      • thread.pl
      • macros.pl
      • intercept.pl -- Intercept and signal interface
      • prolog_codewalk.pl -- Prolog code walker
      • prolog_jiti.pl -- Just In Time Indexing (JITI) utilities
      • prolog_history.pl
      • nb_set.pl -- Non-backtrackable sets
      • prolog_metainference.pl
      • prolog_trace.pl
      • vm.pl
      • portray_text.pl
      • prolog_autoload.pl -- Autoload all dependencies
      • system.pl
      • tty.pl
      • hashtable.pl
      • readln.pl
      • fastrw.pl
      • tableutil.pl
 apropos(+Query) is det
 apropos(+Query, +Options) 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.

Only the best limit matches are shown. Options:

limit(+Count)
Maximum number of matches to show. Default 20.
offset(+Skip)
Ignore the Skip best matches. Default 0.

If the terminal supports hyperlinks (see the Prolog flag hyperlink_term), the matches are clickable and so is the line that reports there are more matches. In an Epilog window, clicking these runs help/1 on the match or apropos/2 on the next page.