Why bother with a function and an anonymous function and all those nasty indices? 
use strict;
my @chr = map chr, 33..126;

my @stack;
my $fresh;

while (1) {
    if (not @stack) {
        $fresh++;
    }
    else {
        shift @{$stack[-1]};
        if (not @{$stack[-1]}) {
            pop @stack;
            $fresh++;
            redo;
        }
    }

    push @stack, map [@chr], 1..$fresh;
    $fresh = 0;

    print map $_->[0], @stack;
    print "\n";
}

[download]
Update: Fixed off by one bug that BrowserUk noticed.

In reply to Re^2: secret code generator by tilly
in thread secret code generator by xiaoyafeng

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