Provided by: libterm-readkey-perl_2.31-1_amd64 bug

NAME

       Term::ReadKey - A perl module for simple terminal control

SYNOPSIS

               use Term::ReadKey;
               ReadMode 4; # Turn off controls keys
               while (not defined ($key = ReadKey(-1))) {
                       # No key yet
               }
               print "Get key $key\n";
               ReadMode 0; # Reset tty mode before exiting

DESCRIPTION

       Term::ReadKey is a compiled perl module dedicated to providing simple control over
       terminal driver modes (cbreak, raw, cooked, etc.,) support for non-blocking reads, if the
       architecture allows, and some generalized handy functions for working with terminals. One
       of the main goals is to have the functions as portable as possible, so you can just plug
       in "use Term::ReadKey" on any architecture and have a good likelihood of it working.

       Version 2.30.01: Added handling of arrows, page up/down, home/end, insert/delete keys
       under Win32. These keys emit xterm-compatible sequences.  Works with Term::ReadLine::Perl.

       ReadMode MODE [, Filehandle]
               Takes an integer argument, which can currently be one of the following values:

                   0    Restore original settings.
                   1    Change to cooked mode.
                   2    Change to cooked mode with echo off.
                         (Good for passwords)
                   3    Change to cbreak mode.
                   4    Change to raw mode.
                   5    Change to ultra-raw mode.
                         (LF to CR/LF translation turned off)

                   Or, you may use the synonyms:

                   restore
                   normal
                   noecho
                   cbreak
                   raw
                   ultra-raw

               These functions are automatically applied to the STDIN handle if no other handle
               is supplied. Modes 0 and 5 have some special properties worth mentioning: not only
               will mode 0 restore original settings, but it cause the next ReadMode call to save
               a new set of default settings. Mode 5 is similar to mode 4, except no CR/LF
               translation is performed, and if possible, parity will be disabled (only if not
               being used by the terminal, however. It is no different from mode 4 under
               Windows.)

               If you are executing another program that may be changing the terminal mode, you
               will either want to say

                   ReadMode 1
                   system('someprogram');
                   ReadMode 1;

               which resets the settings after the program has run, or:

                   $somemode=1;
                   ReadMode 0;
                   system('someprogram');
                   ReadMode 1;

               which records any changes the program may have made, before resetting the mode.

       ReadKey MODE [, Filehandle]
               Takes an integer argument, which can currently be one of the following values:

                   0    Perform a normal read using getc
                   -1   Perform a non-blocked read
                   >0   Perform a timed read

               (If the filehandle is not supplied, it will default to STDIN.) If there is nothing
               waiting in the buffer during a non-blocked read, then undef will be returned. Note
               that if the OS does not provide any known mechanism for non-blocking reads, then a
               "ReadKey -1" can die with a fatal error. This will hopefully not be common.

               If MODE is greater then zero, then ReadKey will use it as a timeout value in
               seconds (fractional seconds are allowed), and won't return "undef" until that time
               expires. (Note, again, that some OS's may not support this timeout behaviour.) If
               MODE is less then zero, then this is treated as a timeout of zero, and thus will
               return immediately if no character is waiting. A MODE of zero, however, will act
               like a normal getc.

               There are currently some limitations with this call under Windows. It may be
               possible that non-blocking reads will fail when reading repeating keys from more
               then one console.

       ReadLine MODE [, Filehandle]
               Takes an integer argument, which can currently be one of the following values:

                   0    Perform a normal read using scalar(<FileHandle>)
                   -1   Perform a non-blocked read
                   >0   Perform a timed read

               If there is nothing waiting in the buffer during a non-blocked read, then undef
               will be returned. Note that if the OS does not provide any known mechanism for
               non-blocking reads, then a "ReadLine 1" can die with a fatal error. This will
               hopefully not be common. Note that a non-blocking test is only performed for the
               first character in the line, not the entire line.  This call will probably not do
               what you assume, especially with ReadMode's higher then 1. For example, pressing
               Space and then Backspace would appear to leave you where you started, but any
               timeouts would now be suspended.

               This call is currently not available under Windows.

       GetTerminalSize [Filehandle]
               Returns either an empty array if this operation is unsupported, or a four element
               array containing: the width of the terminal in characters, the height of the
               terminal in character, the width in pixels, and the height in pixels. (The pixel
               size will only be valid in some environments.)

               Under Windows, this function must be called with an "output" filehandle, such as
               STDOUT, or a handle opened to CONOUT$.

       SetTerminalSize WIDTH,HEIGHT,XPIX,YPIX [, Filehandle]
               Return -1 on failure, 0 otherwise. Note that this terminal size is only for
               informative value, and changing the size via this mechanism will not change the
               size of the screen. For example, XTerm uses a call like this when it resizes the
               screen. If any of the new measurements vary from the old, the OS will probably
               send a SIGWINCH signal to anything reading that tty or pty.

               This call does not work under Windows.

       GetSpeeds [, Filehandle]
               Returns either an empty array if the operation is unsupported, or a two value
               array containing the terminal in and out speeds, in decimal. E.g, an in speed of
               9600 baud and an out speed of 4800 baud would be returned as (9600,4800). Note
               that currently the in and out speeds will always be identical in some OS's. No
               speeds are reported under Windows.

       GetControlChars [, Filehandle]
               Returns an array containing key/value pairs suitable for a hash. The pairs consist
               of a key, the name of the control character/signal, and the value of that
               character, as a single character. This call does nothing under Windows.

               Each key will be an entry from the following list:

                       DISCARD
                       DSUSPEND
                       EOF
                       EOL
                       EOL2
                       ERASE
                       ERASEWORD
                       INTERRUPT
                       KILL
                       MIN
                       QUIT
                       QUOTENEXT
                       REPRINT
                       START
                       STATUS
                       STOP
                       SUSPEND
                       SWITCH
                       TIME

               Thus, the following will always return the current interrupt character, regardless
               of platform.

                       %keys = GetControlChars;
                       $int = $keys{INTERRUPT};

       SetControlChars [, Filehandle]
               Takes an array containing key/value pairs, as a hash will produce. The pairs
               should consist of a key that is the name of a legal control character/signal, and
               the value should be either a single character, or a number in the range 0-255.
               SetControlChars will die with a runtime error if an invalid character name is
               passed or there is an error changing the settings. The list of valid names is
               easily available via

                       %cchars = GetControlChars();
                       @cnames = keys %cchars;

               This call does nothing under Windows.

AUTHOR

       Kenneth Albanowski <kjahds@kjahds.com>

       Currently maintained by Jonathan Stowe <jns@gellyfish.co.uk>

SUPPORT

       The code is maintained at

            https://github.com/jonathanstowe/TermReadKey

       Please feel free to fork and suggest patches.

LICENSE

       Prior to the 2.31 release the license statement was:

        Copyright (C) 1994-1999 Kenneth Albanowski.
                       2001-2005 Jonathan Stowe and others

                        Unlimited distribution and/or modification is allowed as long as this
                         copyright notice remains intact.

       And was only stated in the README file.

       Because I believe the original author's intent was to be more open than the other commonly
       used licenses I would like to leave that in place. However if you or your lawyers require
       something with some more words you can optionally choose to license this under the
       standard Perl license:

             This module is free software; you can redistribute it and/or modify it
             under the terms of the Artistic License. For details, see the full
             text of the license in the file "Artistic" that should have been provided
             with the version of perl you are using.

             This program is distributed in the hope that it will be useful, but
             without any warranty; without even the implied warranty of merchantability
             or fitness for a particular purpose.