method

invoke_from_option

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What's this?

invoke_from_option(*names, &block) public

Invoke a thor class based on the value supplied by the user to the given option named “name”. A class option must be created before this method is invoked for each name given.

Examples

class GemGenerator < Bundler::Thor::Group
  class_option :test_framework, :type => :string
  invoke_from_option :test_framework
end

Boolean options

In some cases, you want to invoke a thor class if some option is true or false. This is automatically handled by invoke_from_option. Then the option name is used to invoke the generator.

Preparing for invocation

In some cases you want to customize how a specified hook is going to be invoked. You can do that by overwriting the class method prepare_for_invocation. The class method must necessarily return a klass and an optional command.

Custom invocations

You can also supply a block to customize how the option is going to be invoked. The block receives two parameters, an instance of the current class and the klass to be invoked.

Show source

# File lib/bundler/vendor/thor/lib/thor/group.rb, line 110
    def invoke_from_option(*names, &block)
      options = names.last.is_a?(Hash) ? names.pop : {}
      verbose = options.fetch(:verbose, :white)

      names.each do |name|
        unless class_options.key?(name)
          raise ArgumentError, "You have to define the option #{name.inspect} "                                "before setting invoke_from_option."
        end

        invocations[name] = true
        invocation_blocks[name] = block if block_given?

        class_eval           def _invoke_from_option_#{name.to_s.gsub(/\W/, '_')}            return unless options[#{name.inspect}]            value = options[#{name.inspect}]            value = #{name.inspect} if TrueClass === value            klass, command = self.class.prepare_for_invocation(#{name.inspect}, value)            if klass              say_status :invoke, value, #{verbose.inspect}              block = self.class.invocation_blocks[#{name.inspect}]              _invoke_for_class_method klass, command, &block            else              say_status :error, %(\#{value} [not found]), :red            end          end, __FILE__, __LINE__
      end
    end

invoke_from_option

Related methods

Examples

Boolean options

Preparing for invocation

Custom invocations

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