#!/usr/bin/perl -w
use strict;
use warnings;

use Curses;

my @LETTERS = ( 'A' .. 'Z', 'a' .. 'z', ',', ' ' );
$SIG{TERM} = sub { exit };

my $STRING = 'Just Another Perl Hacker,';
my $LENGTH = length $STRING;

initscr;

my $ROW    = ( LINES() % 2 ? LINES() - 1 : LINES() ) / 2;
my $COLUMN = ( COLS() % 2 ? COLS() - 1 : COLS() ) / 2 -
	( $LENGTH % 2 ? $LENGTH - 1 : $LENGTH ) / 2;
my $END_COL = $COLUMN + $LENGTH - 1;

my @array;
my $count = 0;

my $x = random( LINES );
my $y = random( COLS );
my $letter = sub { $LETTERS[ int( rand( @LETTERS ) ) ] };

while( 1 ) {
	my $x      = &$x;
	my $y      = &$y;
	my $letter = &$letter;

	next if( $x == $ROW and $array[$y] );

	if( $x == $ROW and $y >= $COLUMN and $y <= $END_COL
		and substr( $STRING, $y - $COLUMN, 1 ) eq $letter ) {
		$array[$y]++;
		$count++;
		}

	put_letter( $letter, $x, $y );

	if( $count == $LENGTH ) { @LETTERS = ' '; }
	}

sub random {
	my $range = shift;
	sub { int( rand($range) ) }
	}

sub put_letter {
	my ($letter, $x, $y) = @_;
	addch( $x, $y, $letter );
	refresh;
	}