#014803: Problem with ezcConsoleOption when short option name is empty

Hi

I want to have two options which are mutual exclusive. This works fine:

$inputOption = $input->registerOption(
    new ezcConsoleOption(
        'i',
        'input',
        ezcConsoleInput::TYPE_STRING
    )
);

$outputOption = $input->registerOption(
    new ezcConsoleOption(
        'o',
        'output'
    )
);
$outputOption->type = ezcConsoleInput::TYPE_STRING;

$inputOption->addExclusion( new ezcConsoleOptionRule( $outputOption ) );
$outputOption->addExclusion( new ezcConsoleOptionRule( $inputOption ) );

But this doesn't work if you don't want to have short parameters like -i and -o (only --input and --output). There is nothing in the documentation saying this is not possible. On the contrary, http://ezcomponents.org/docs/api/trunk/ConsoleTools/ezcConsoleOption.html

ezcConsoleOption __construct( [string $short = ''], string $long (...) )

However, if you let $short='', the example above will not work:

$inputOption = $input->registerOption(
    new ezcConsoleOption(
        '',
        'input',
        ezcConsoleInput::TYPE_STRING
    )
);

$outputOption = $input->registerOption(
    new ezcConsoleOption(
        '',
        'output'
    )
);
$outputOption->type = ezcConsoleInput::TYPE_STRING;

$inputOption->addExclusion( new ezcConsoleOptionRule( $outputOption ) );
$outputOption->addExclusion( new ezcConsoleOptionRule( $inputOption ) );

The output will then be:

$ php a.php -input asd
The option 'input' excludes the option 'output'but this one was submitted.

(also note the lack of space before "but")

PS
My example is based on example 6 on http://ezcomponents.org/docs/tutorials/ConsoleTools#mastering-options-and-arguments

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