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Contents
module RubiGen
# A spec knows where a generator was found and how to instantiate it.
# Metadata include the generator's name, its base path, and the source
# which yielded it (PathSource, GemPathSource, etc.)
class Spec
attr_reader :name, :path, :source
def initialize(name, path, source)
@name, @path, @source, @klass = name, path, source, nil
end
# Look up the generator class. Require its class file, find the class
# in ObjectSpace, tag it with this spec, and return.
def klass
unless @klass
require class_file
@klass = lookup_class
@klass.spec = self
end
@klass
end
def class_file
"#{path}/#{name}_generator.rb"
end
def class_name
"#{name.camelize}Generator"
end
def usage_file
"#{path}/USAGE"
end
def visible?
File.exists? usage_file
end
private
# Search for the first Class descending from RubiGen::Base
# whose name matches the requested class name.
def lookup_class
ObjectSpace.each_object(Class) do |obj|
return obj if valid_superclass?(obj) and
obj.name.split('::').last == class_name
end
raise NameError, "Missing #{class_name} class in #{class_file}"
end
def valid_superclass?(obj)
valid_generator_superclasses.each do |klass|
return true if obj.ancestors.include?(klass)
end
false
end
def valid_generator_superclasses
@valid_generator_superclasses ||= [
"RubiGen::Base",
"Rails::Generator::Base"
].inject([]) do |list, class_name|
klass = class_name.split("::").inject(Object) do |klass, name|
klass.const_get(name) rescue nil
end
list << klass if klass
list
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems