#! perl

package Term::ReadKey;

# This also needs to be adjusted in the generated code below

# and in the Makefile.PL

use vars qw($VERSION);

$VERSION = '2.37';

use Config;

use File::Basename qw(&basename &dirname);

use File::Spec;

use Cwd;

# List explicitly here the variables you want Configure to

# generate.  Metaconfig only looks for shell variables, so you

# have to mention them as if they were shell variables, not

# %Config entries.  Thus you write

#  $startperl

# to ensure Configure will look for $Config{startperl}.

# Wanted:  $archlibexp

# This forces PL files to create target in same directory as PL file.

# This is so that make depend always knows where to find PL derivatives.

my $origdir = cwd;

my $dir = dirname($0);

chdir $dir;

my $file = 'ReadKey.pm';

open OUT, ">", $file or die "Can't create $file: $!";

print "Creating $file\n";

print OUT <<'!FIRSTPART';

# -*- buffer-read-only: t -*-

#

# This file is auto-generated. ***ANY*** changes here will be lost

#

package Term::ReadKey;

use strict;

use warnings;

=head1 NAME

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

=head1 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

=head1 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.

=over 4

=item ReadMode MODE [, Filehandle]

Takes an integer argument or a string synonym (case insensitive), which

can currently be one of the following values:

    INT   SYNONYM    DESCRIPTION

    0    'restore'   Restore original settings.

    1    'normal'    Change to what is commonly the default mode,

                     echo on, buffered, signals enabled, Xon/Xoff

                     possibly enabled, and 8-bit mode possibly disabled.

    2    'noecho'    Same as 1, just with echo off. Nice for

                     reading passwords.

    3    'cbreak'    Echo off, unbuffered, signals enabled, Xon/Xoff

                     possibly enabled, and 8-bit mode possibly enabled.

    4    'raw'       Echo off, unbuffered, signals disabled, Xon/Xoff

                     disabled, and 8-bit mode possibly disabled.

    5    'ultra-raw' Echo off, unbuffered, signals disabled, Xon/Xoff 

                     disabled, 8-bit mode enabled if parity permits,

                     and CR to CR/LF translation turned off. 

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 just need to read a key at a time, then modes 3 or 4 are probably

sufficient. Mode 4 is a tad more flexible, but needs a bit more work to

control. If you use ReadMode 3, then you should install a SIGINT or END

handler to reset the terminal (via ReadMode 0) if the user aborts the

program via C<^C>. (For any mode, an END handler consisting of "ReadMode 0"

is actually a good idea.)

If you are executing another program that may be changing the terminal mode,

you will either want to say

    ReadMode 1;             # same as ReadMode 'normal'

    system('someprogram');

    ReadMode 1;

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

    $somemode=1;

    ReadMode 0;             # same as ReadMode 'restore'

    system('someprogram');

    ReadMode 1;

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

mode.

=item 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.  In most situations, you will probably want to use C<ReadKey -1>.

I<NOTE> that if the OS does not provide any known mechanism for non-blocking

reads, then a C<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 C<undef> until

that time expires.

I<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.

I<NOTE>, 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.

=item 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.

I<NOTE>, that if the OS does not provide any known mechanism for

non-blocking reads, then a C<ReadLine 1> can die with a fatal

error. This will hopefully not be common.

I<NOTE> that a non-blocking test is only performed for the first character

in the line, not the entire line.  This call will probably B<not> do what

you assume, especially with C<ReadMode> MODE values 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.

B<This call is currently not available under Windows>.

=item 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.)

I<NOTE>, under Windows, this function must be called with an B<output>

filehandle, such as C<STDOUT>, or a handle opened to C<CONOUT$>.

=item SetTerminalSize WIDTH,HEIGHT,XPIX,YPIX [, Filehandle]

Return -1 on failure, 0 otherwise.

I<NOTE> that this terminal size is only for B<informative> value, and

changing the size via this mechanism will B<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.

B<This call does not work under Windows>.

=item GetSpeed [, Filehandle]

Returns either an empty array if the operation is unsupported, or a two

value array containing the terminal in and out speeds, in B<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.

B<No speeds are reported under Windows>.

=item 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.

B<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};

=item 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;

B<This call does nothing under Windows>.

=back

=head1 AUTHOR

Kenneth Albanowski <kjahds@kjahds.com>

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

=head1 SUPPORT

The code is maintained at 

     https://github.com/jonathanstowe/TermReadKey

Please feel free to fork and suggest patches.

=head1 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.

=cut

use vars qw($VERSION);

$VERSION = '2.37';

require Exporter;

require DynaLoader;

use vars qw(@ISA @EXPORT_OK @EXPORT);

@ISA = qw(Exporter DynaLoader);

# Items to export into callers namespace by default

# (move infrequently used names to @EXPORT_OK below)

@EXPORT = qw(

  ReadKey

  ReadMode

  ReadLine

  GetTerminalSize

  SetTerminalSize

  GetSpeed

  GetControlChars

  SetControlChars

);

@EXPORT_OK = qw();

bootstrap Term::ReadKey;

# Should we use LINES and COLUMNS to try and get the terminal size?

# Change this to zero if you have systems where these are commonly

# set to erroneous values. (But if either are near zero, they won't be

# used anyhow.)

use vars qw($UseEnv $CurrentMode %modes);

$UseEnv = 1;

$CurrentMode = 0;

%modes = (                            # lowercase is canonical

    original    => 0,

    restore     => 0,

    normal      => 1,

    noecho      => 2,

    cbreak      => 3,

    raw         => 4,

    'ultra-raw' => 5

);

# reduce Carp memory footprint, only load when needed

sub croak { require Carp; goto &Carp::croak; }

sub carp  { require Carp; goto &Carp::carp; }

sub ReadMode

{

    my $mode = $modes{ lc $_[0] };  # lowercase is canonical

    my $fh = normalizehandle( ( @_ > 1 ? $_[1] : \*STDIN ) );

    if ( defined($mode) )    { $CurrentMode = $mode }

    elsif ( $_[0] =~ /^\d/ ) { $CurrentMode = $_[0] }

    else                     { croak("Unknown terminal mode `$_[0]'"); }

    SetReadMode($CurrentMode, $fh);

}

sub normalizehandle

{

    my ($file) = @_; # allows fake signature optimization

    no strict;

    #	print "Handle = $file\n";

    if ( ref($file) ) { return $file; }    # Reference is fine

    #	if ($file =~ /^\*/) { return $file; } # Type glob is good

    if ( ref( \$file ) eq 'GLOB' ) { return $file; }    # Glob is good

    #	print "Caller = ",(caller(1))[0],"\n";

    return \*{ ( ( caller(1) )[0] ) . "::$file" };

}

sub GetTerminalSize

{

    my $file = normalizehandle( ( @_ > 0 ? $_[0] : \*STDOUT ) );

    my (@results, @fail);

    if ( &termsizeoptions() & 1 )                       # VIO

    {

        @results = GetTermSizeVIO($file);

        push( @fail, "VIOGetMode call" );

    }

    elsif ( &termsizeoptions() & 2 )                    # GWINSZ

    {

        @results = GetTermSizeGWINSZ($file);

        push( @fail, "TIOCGWINSZ ioctl" );

    }

    elsif ( &termsizeoptions() & 4 )                    # GSIZE

    {

        @results = GetTermSizeGSIZE($file);

        push( @fail, "TIOCGSIZE ioctl" );

    }

    elsif ( &termsizeoptions() & 8 )                    # WIN32

    {

        @results = GetTermSizeWin32($file);

        push( @fail, "Win32 GetConsoleScreenBufferInfo call" );

    }

    else

    {

        @results = ();

    }

    if ( @results < 4 and $UseEnv )

    {

        my ($C) = defined( $ENV{COLUMNS} ) ? $ENV{COLUMNS} : 0;

        my ($L) = defined( $ENV{LINES} )   ? $ENV{LINES}   : 0;

        if ( ( $C >= 2 ) and ( $L >= 2 ) )

        {

            @results = ( $C + 0, $L + 0, 0, 0 );

        }

        push( @fail, "COLUMNS and LINES environment variables" );

    }

    if ( @results < 4 && $^O ne 'MSWin32')

    {

        my ($prog) = "resize";

        # Workaround for Solaris path silliness

        if ( -f "/usr/openwin/bin/resize" ) {

            $prog = "/usr/openwin/bin/resize";

        }

        my ($resize) = scalar(`$prog 2>/dev/null`);

        if (defined $resize

            and (  $resize =~ /COLUMNS\s*=\s*(\d+)/

                or $resize =~ /setenv\s+COLUMNS\s+'?(\d+)/ )

           )

        {

            $results[0] = $1;

            if (   $resize =~ /LINES\s*=\s*(\d+)/

                or $resize =~ /setenv\s+LINES\s+'?(\d+)/ )

            {

                $results[1] = $1;

                @results[ 2, 3 ] = ( 0, 0 );

            }

            else

            {

                @results = ();

            }

        }

        else

        {

            @results = ();

        }

        push( @fail, "resize program" );

    }

    if ( @results < 4 && $^O ne 'MSWin32' )

    {

        my ($prog) = "stty size";

        my ($stty) = scalar(`$prog 2>/dev/null`);

        if (defined $stty

            and (  $stty =~ /(\d+) (\d+)/ )

           )

        {

            $results[0] = $2;

            $results[1] = $1;

            @results[ 2, 3 ] = ( 0, 0 );

        }

        else

        {

            @results = ();

        }

        push( @fail, "stty program" );

    }

    if ( @results != 4 )

    {

        carp("Unable to get Terminal Size."

             . join( "", map( " The $_ didn't work.", @fail ) ));

	return undef;

    }

    @results;

}

!FIRSTPART

close OUT;

# preload the XS module needed for the blockoptions() expansions below

# does not work with miniperl

package Term::ReadKey;

require DynaLoader;

our @ISA = qw(DynaLoader);

print "Bootstrapping the XS for blockoptions: ";

bootstrap Term::ReadKey or die;

print blockoptions()."\n";

open OUT, ">>", $file or die "Can't append to $file: $!";

print OUT "# blockoptions: \n";

if ( &blockoptions() & 1 )    # Use nodelay

{

    print OUT "#nodelay\n";

    if ( &blockoptions() & 2 )    #poll

    {

        print OUT <<'!NO!SUBS!';

# poll

sub ReadKey {

  my $File = normalizehandle((@_>1?$_[1]:\*STDIN));

  if (defined $_[0] && $_[0] > 0) {

      if ($_[0]) {

          return undef if &pollfile($File,$_[0]) == 0;

      }

  }

  if (defined $_[0] && $_[0] < 0) { &setnodelay($File,1); }

  my $value = getc $File;

  if (defined $_[0] && $_[0] < 0) { &setnodelay($File,0); }

  $value;

}

sub ReadLine {

    my $File = normalizehandle((@_>1?$_[1]:\*STDIN));

    if (defined $_[0] && $_[0] > 0) {

        if ($_[0]) {

            return undef if &pollfile($File,$_[0]) == 0;

        }

    }

    if (defined $_[0] && $_[0] < 0) { &setnodelay($File,1) };

    my $value = scalar(<$File>);

    if (defined $_[0] && $_[0] < 0) { &setnodelay($File,0) };

    $value;

}

!NO!SUBS!

    }

    elsif ( &blockoptions() & 4 )    #select

    {

        print OUT <<'!NO!SUBS!';

#select

sub ReadKey {

    my $File = normalizehandle((@_>1?$_[1]:\*STDIN));

    if (defined $_[0] && $_[0] > 0) {

        if ($_[0]) { return undef if &selectfile($File,$_[0]) == 0 }

    }

    if (defined $_[0] && $_[0] < 0) { &setnodelay($File,1); }

    my $value = getc $File;

    if (defined $_[0] && $_[0] < 0) { &setnodelay($File,0); }

    $value;

}

sub ReadLine {

    my $File = normalizehandle((@_>1?$_[1]:\*STDIN));

    if (defined $_[0] && $_[0] > 0) {

        if ($_[0]) { return undef if &selectfile($File,$_[0]) == 0 }

    }

    if (defined $_[0] && $_[0] < 0) { &setnodelay($File,1) };

    my $value = scalar(<$File>);

    if (defined $_[0] && $_[0] < 0) { &setnodelay($File,0) };

    $value;

}

!NO!SUBS!

    }

    else

    {    #nothing

        print OUT <<'!NO!SUBS!';

sub ReadKey {

    my $File = normalizehandle((@_>1?$_[1]:\*STDIN));

    if (defined $_[0] && $_[0] > 0) {

    	# Nothing better seems to exist, so I just use time-of-day

    	# to timeout the read. This isn't very exact, though.

    	$starttime = time;

    	$endtime = $starttime + $_[0];

        &setnodelay($File,1);

        my $value;

    	while (time < $endtime) { # This won't catch wraparound!

            $value = getc $File;

            last if defined($value);

    	}

        &setnodelay($File,0);

        return $value;

    }

    if (defined $_[0] && $_[0] < 0) { &setnodelay($File,1); }

    my $value = getc $File;

    if (defined $_[0] && $_[0] < 0) { &setnodelay($File,0); }

    $value;

}

sub ReadLine {

    my $File = normalizehandle((@_>1?$_[1]:\*STDIN));

    if (defined $_[0] && $_[0] > 0) {

    	# Nothing better seems to exist, so I just use time-of-day

    	# to timeout the read. This isn't very exact, though.

    	$starttime = time;

    	$endtime = $starttime + $_[0];

        &setnodelay($File,1);

        my $value;

    	while (time < $endtime) { # This won't catch wraparound!

            $value = scalar(<$File>);

            last if defined($value);

    	}

        &setnodelay($File,0);

        return $value;

    }

    if (defined $_[0] && $_[0] < 0) { &setnodelay($File,1) };

    my $value = scalar(<$File>);

    if (defined $_[0] && $_[0] < 0) { &setnodelay($File,0) };

    $value;

}

!NO!SUBS!

    }

}

else {

    print OUT "#no nodelay\n";

    if ( &blockoptions() & 2 )    # Use poll

    {

        print OUT <<'!NO!SUBS!';

#poll

sub ReadKey {

    my $File = normalizehandle((@_>1?$_[1]:\*STDIN));

    if (defined $_[0] && $_[0] != 0) {

        return undef if &pollfile($File,$_[0]) == 0

    }

    getc $File;

}

sub ReadLine {

    my $File = normalizehandle((@_>1?$_[1]:\*STDIN));

    if (defined $_[0] && $_[0] != 0 ) {

        return undef if &pollfile($File,$_[0]) == 0;

    }

    scalar(<$File>);

}

!NO!SUBS!

    }

    elsif ( &blockoptions() & 4 )    # Use select

    {

        print OUT <<'!NO!SUBS!';

#select

sub ReadKey {

    my $File = normalizehandle((@_>1?$_[1]:\*STDIN));

    if (defined $_[0] && $_[0] != 0) {

        return undef if &selectfile($File,$_[0]) == 0

    }

    getc $File;

}

sub ReadLine {

    my $File = normalizehandle((@_>1?$_[1]:\*STDIN));

    if (defined $_[0] && $_[0] != 0) {

        return undef if &selectfile($File,$_[0]) == 0;

    }

    scalar(<$File>);

}

!NO!SUBS!

    }

    elsif ( &blockoptions() & 8 )    # Use Win32

    {

        print OUT <<'!NO!SUBS!';

#Win32

sub ReadKey {

    my $File = normalizehandle((@_>1?$_[1]:\*STDIN));

    if ($_[0] || $CurrentMode >= 3) {

        Win32PeekChar($File, $_[0]);

    } else {

	getc $File;

    }

    #if ($_[0]!=0) {return undef if !Win32PeekChar($File, $_[0])};

    #getc $File;

}

sub ReadLine {

    my $File = normalizehandle((@_>1?$_[1]:\*STDIN));

    #if ($_[0]!=0) {return undef if !Win32PeekChar($File, $_[0])};

    #scalar(<$File>);

    if ($_[0]) {

        croak("Non-blocking ReadLine is not supported on this architecture")

    }

    scalar(<$File>);

}

!NO!SUBS!

    }

    else

    {

        print OUT <<'!NO!SUBS!';

sub ReadKey {

    my $File = normalizehandle((@_>1?$_[1]:\*STDIN));

    if ($_[0]) {

        croak("Non-blocking ReadKey is not supported on this architecture")

    }

    getc $File;

}

sub ReadLine {

    my $File = normalizehandle((@_>1?$_[1]:\*STDIN));

    if ($_[0]) {

      croak("Non-blocking ReadLine is not supported on this architecture")

    }

    scalar(<$File>);

}

!NO!SUBS!

    }

}

print OUT <<'EOF';

1;

# ex: set ro:

EOF

close OUT;

if (-s $file < 1000) {

    warn "WARNING: $file probably too small";

} else {

    print "Done\n";

}