Options validation

[timfjord]

Maybe make sense add option validations, so we can validate options and provide error messages if validation not passed

We can implement some predefined validators but also allow use add custom validation methods

Smth like

class Test < Thor
  desc "example FILE", "an example task"
  method_option :date, :aliases => "-d", :desc => "Specify date", :validators => { :date => 'Date shold be valid' }
  method_option :email, :aliases => "-e", :desc => "Email", :validators => { :email }
  def example(file)
    # some code
  end

private

  def date(value)
    # return true or false
  end
end

If you find such functionality useful i can help with implementation

Also we can think about syntax to make it flexible

[jxpx777]

I was looking for something like this myself. If :validation option took an Array, you could specify a simple list of valid values. With a Proc, some more advanced logic. With a class, it would specify a Ruby object tasked with the validation. Maybe a Thor::Validation module to formalizes the validation API for classes?

[eventualbuddha]

Is there an advantage to this as opposed to doing it yourself in the actual task?

[timfjord]

Just thinking how to make code DRY

[askreet]

I think this is a great idea, and a symbol that references a local-scope method seems like a nice simple approach. I may tackle this in the near future.