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/usr/lib/swipl/library/tty.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
      • predicate_options.pl -- Access and analyse predicate options
      • shlib.pl -- Utility library for loading foreign objects (DLLs, shared objects)
      • option.pl
      • thread_pool.pl
      • gensym.pl
      • settings.pl
      • arithmetic.pl
      • 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
      • quasi_quotations.pl -- Define Quasi Quotation syntax
      • url.pl -- Analysing and constructing URL
      • www_browser.pl -- Open a URL in the users browser
      • prolog_colour.pl
      • record.pl -- Access compound arguments by name
      • prolog_xref.pl -- Prolog cross-referencer data collection
      • occurs.pl -- Finding and counting sub-terms
      • ordsets.pl -- Ordered set manipulation
      • assoc.pl -- Binary associations
      • ugraphs.pl -- Graph manipulation library
      • iostream.pl -- Utilities to deal with streams
      • atom.pl -- Operations on atoms
      • prolog_pack.pl -- A package manager for Prolog
      • solution_sequences.pl -- Modify solution sequences
      • git.pl -- Run GIT commands
      • ctypes.pl -- Character code classification
      • utf8.pl -- UTF-8 encoding/decoding on lists of character codes.
      • base64.pl -- Base64 encoding and decoding
      • persistency.pl -- Provide persistent dynamic predicates
      • pure_input.pl -- Pure Input from files and streams
      • nb_set.pl -- Non-backtrackable sets
      • aggregate.pl -- Aggregation operators on backtrackable predicates
      • csv.pl -- Process CSV (Comma-Separated Values) data
      • dialect.pl -- Support multiple Prolog dialects
      • apply_macros.pl -- Goal expansion rules to avoid meta-calling
      • yall.pl -- Lambda expressions
      • prolog_code.pl -- Utilities for reasoning about code
      • dif.pl -- The dif/2 constraint
      • thread.pl -- High level thread primitives
      • rbtrees.pl -- Red black trees
      • nb_rbtrees.pl -- Non-backtrackable operations on red black trees
      • random.pl -- Random numbers
      • sandbox.pl -- Sandboxed Prolog code
      • prolog_format.pl -- Analyse format specifications
      • pprint.pl -- Pretty Print Prolog terms
      • modules.pl -- Module utility predicates
      • lazy_lists.pl -- Lazy list handling
      • edinburgh.pl -- Some traditional Edinburgh predicates
      • prolog_clause.pl -- Get detailed source-information about a clause
      • prolog_breakpoints.pl -- Manage Prolog break-points
      • dicts.pl -- Dict utilities
      • check.pl -- Consistency checking
      • ansi_term.pl -- Print decorated text to ANSI consoles
      • backcomp.pl -- Backward compatibility
      • writef.pl -- Old-style formatted write
      • charsio.pl -- I/O on Lists of Character Codes
      • sort.pl
      • base32.pl -- Base32 encoding and decoding
      • tables.pl -- XSB interface to tables
      • statistics.pl -- Get information about resource usage
      • varnumbers.pl -- Utilities for numbered terms
      • prolog_jiti.pl -- Just In Time Indexing (JITI) utilities
      • intercept.pl -- Intercept and signal interface
      • terms.pl -- Term manipulation
      • quintus.pl -- Quintus compatibility
      • codesio.pl -- I/O on Lists of Character Codes
      • prolog_debug.pl -- User level debugging tools
      • listing.pl -- List programs and pretty print clauses
      • make.pl -- Reload modified source files
      • increval.pl -- Incremental dynamic predicate modification
      • strings.pl -- String utilities
      • date.pl -- Process dates and times
      • help.pl -- Text based manual
      • prolog_wrap.pl -- Wrapping predicates
      • rwlocks.pl -- Read/write locks
      • shell.pl -- Elementary shell commands
      • explain.pl -- Describe Prolog Terms
      • threadutil.pl -- Interactive thread utilities
      • prolog_versions.pl -- Demand specific (Prolog) versions
      • wfs.pl -- Well Founded Semantics interface
      • optparse.pl -- command line parsing
      • prolog_profile.pl -- Execution profiler
      • qsave.pl -- Save current program as a state or executable
      • zip.pl -- Access resource ZIP archives
      • heaps.pl -- heaps/priority queues
      • prolog_history.pl -- Per-directory persistent commandline history
      • when.pl -- Conditional coroutining
      • prolog_trace.pl -- Print access to predicates
      • edit.pl -- Editor interface
      • prolog_stack.pl -- Examine the Prolog stack
      • prolog_codewalk.pl -- Prolog code walker
      • prolog_metainference.pl -- Infer meta-predicate properties
      • prolog_coverage.pl -- Coverage analysis tool
      • macros.pl -- Macro expansion
      • exceptions.pl -- Exception classification
      • oset.pl -- Ordered set manipulation
      • hashtable.pl -- Hash tables
      • coinduction.pl -- Co-Logic Programming
      • system.pl -- System utilities
      • prolog_autoload.pl -- Autoload all dependencies
      • prolog_config.pl -- Provide configuration information
      • portray_text.pl -- Portray text
      • win_menu.pl -- Console window menu
      • tty.pl -- Terminal operations
        • tty_clear/0
        • tty_flash/0
        • menu/3
      • fastrw.pl -- Fast reading and writing of terms
      • files.pl
      • streams.pl -- Manage Prolog streams
 menu(+Title, +Options, -Choice) is semidet
Show a menu. The display is cleared, the title is centered at the top, the options are displayed and finally the user actions are parsed and the user's choice is returned. The screen looks like this:
        --------------------------------------------
        |                                          |
        |                  Title                   |
        |                                          |
        |   1) Option One                          |
        |   2) Option Two                          |
        |   3) Quit                                |
        |                                          |
        |   Your Choice? *                         |
        |                                          |

The user selects an item by pressing the number of the item, or the first letter of the option. If more then one option match, the common prefix of the matching options is given and the user is expected to type the next character. On illegal input the screen is flashed (or a beep is given if the terminal can't flash the screen).

Text fields (the title and option texts) are either plain atoms or terms Fmt/Args. In the latter case the argument is transformed into an atom using format/3.

The specification of an option is a term PrologName:UserName. PrologName is an atom, which is returned as choice if the user selects this menu item. UserName is processed as a text field (see above) and displayed. The entries are numbered automatically.

The example above could be defined as:

get_action(Choice) :-
        menu('Title',
                [ option_1 : 'Option One'
                , option_2 : 'Option Two'
                , quit     : 'Quit'
                ], Choice).
ClioPatria (version V3.1.1-51-ga0b30a5)