it gets much simpler (and faster) using Sort::Key: 
use Sort::Key::Multi qw(i3_keysort);
  # i3_keysort => sorter sub that expects
  #               three integer keys

print join "\n",
    map "$_->[0] $_->[1] $_->[2]",
    i3_keysort {
        my ($type, $item, $index) = @$_;
        my ($ix1, $ix2) = $index =~ /^(\d+)\.(\d+)$/;
        my $flag = flagValue($tagTypes{$item}[2]);
        $flag = -$flag if $type eq 'off';

        ($ix1, $ix2, $flag)
    } @tagIndexes;

[download]

note that the type and flag properties can be easily collapsed on an unique index.

In reply to Re: Pimp my code - Schwartzian transform maybe? by salva
in thread Pimp my code - Schwartzian transform maybe? by GrandFather

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