Feature request: use other input values in default

[jamesarosen]

I'd love to be able to use other input values in the Proc form for default:

input :foo, type: [String], allow_nil: false
input :bar, type: [String], default: ->(inputs) { "Default Bar: #{inputs[:foo]}" }

You probably don't want the Proc to be able to modify inputs, so we should pass a defensive copy:

def default_for_normal_mode_with(result, key, default)
  if default.is_a?(Proc)
    args = []
    args.push(result.dup) if default.arity != 0
    default = default.call(*args)
  end

  result[key] = default
end

If you're interested in this, I'm happy to open a pull request.

[sunny]

Oh, that could be interesting! Please go for it 👍🏻

Good thinking about the fact that we should be defensive to disallow copies during checks 👏🏻

[sunny]

Hi @jamesarosen, would you have some time to open a PR for this?

[jamesarosen]

Yes, but it's going to be a week or two before I do.

[sunny]

Sounds good to me :)