symfony2 console arguments

Question

I want to create a single named argument/option for symfony command. And want symfony to distinguish those 3 options:

• my:command, which means something like my:command --arg=null
• my:command --arg, which means my:command --arg=defalutValue
• my:command --arg=someValue, which is fully explicit.

I.e. I want two working modes for code under that command: default one and non-default with additional argument, and that arg should have default value.

I understand, that I could create 2 args, but I'm looking for one-arg-to-rule-them-all solution.

Is it possible to accomplish that with built-in classes or should I create custom ones? If solution is only available with custom classes, please tell me, where to start (i.e. "create subclass of ..." or "install a bundle named ..."), cause I'm not familiar with Symfony2's architecture.

Answer 1

It is possible:

->addOption('arg', 'a', InputOption::VALUE_NONE)

• my:command => $input->getOption('arg') //false
• my:command --arg => $input->getOption('arg') //true
• my:command --arg=5 => $input->getOption('arg') //5

Answer 2

Answer by corvax is incorrect and doesn't work. As of today, you just cannot achieve this.

It is even stated in the Console documentation: Using Command Options.

See also these issues on GitHub:

• #8135 [Console] Input options with InputOption::VALUE_OPTIONAL and InputOption::VALUE_NONE not working as expected
• #11883 [Console] Added three state long option
• #12769 [Console] Ability to use option default only if the option was passed
• #12773 [Console] Add method to know parsed option