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class Thor
class Argument #:nodoc:
VALID_TYPES = [ :numeric, :hash, :array, :string ]
attr_reader :name, :description, :required, :type, :default, :banner
alias :human_name :name
def initialize(name, description=nil, required=true, type=:string, default=nil, banner=nil)
class_name = self.class.name.split("::").last
raise ArgumentError, "#{class_name} name can't be nil." if name.nil?
raise ArgumentError, "Type :#{type} is not valid for #{class_name.downcase}s." if type && !valid_type?(type)
@name = name.to_s
@description = description
@required = required || false
@type = (type || :string).to_sym
@default = default
@banner = banner || default_banner
validate! # Trigger specific validations
end
def usage
required? ? banner : "[#{banner}]"
end
def required?
required
end
def show_default?
case default
when Array, String, Hash
!default.empty?
else
default
end
end
protected
def validate!
raise ArgumentError, "An argument cannot be required and have default value." if required? && !default.nil?
end
def valid_type?(type)
VALID_TYPES.include?(type.to_sym)
end
def default_banner
case type
when :boolean
nil
when :string, :default
human_name.upcase
when :numeric
"N"
when :hash
"key:value"
when :array
"one two three"
end
end
end
end
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