#!/usr/bin/perl
use strict;
use warnings;
use List::Util "shuffle";

my %dict;
my $clear = qx/clear/;
my $word;
my $dorw;
my $words;
my %guesses;

sub load_dict {
   open my $dictfile, "/usr/share/dict/words" or die "error $!";
   /^([a-z]{3,6})\n/ && push @{$dict{length($1)}}, "$1" while <$dictfile>;
}

sub subwords { [ grep $dorw =~ join(".*", sort split(//, $_)), @{$dict{$_[0]}} ] }
sub set_word {
   $word = $dict{6}[rand @{$dict{6}}];
   $dorw = join "", sort split //, $word;
   $words = { map {; $_ => subwords($_) } 3..6 };
   @guesses{@{$words->{$_}}} = ("_" x $_) x @{$words->{$_}} for 3..6;
   $^T = time();
   return;
}

my $guess = '';
sub show {
   print $clear;
   print "\n",(time-$^T),"\n\n";
   print join(" ", ($guess eq '-show' ? @{$words->{$_}} : @guesses{@{$words->{$_}}})), "\n\n" for 3..6;
   print join(" ", shuffle(split //, $word)), "\n";
}

sub guess {
   chomp($guess = <STDIN>);
   $guesses{$guess} = $guess if exists $guesses{$guess};
   set_word() if $guess eq '-new';
}

print "Enter guesses, -show, or -new.  Press Enter to start.\n";
<STDIN>;
load_dict();
set_word();
for (;;) { show(); guess() }