Contents

require 'erb'
require 'ostruct'
require 'fileutils'

module Support
  class Generator
    attr_reader :destination, :source

    def initialize(options)
      @destination = options.fetch(:destination)
      @source = options.fetch(:source)
    end

    def process(files, locals = {})
      context = OpenStruct.new(locals)
      files.each { |file| process_one(file, context) }
    end

    private

    def process_one(file, context)
      output_file = find(file)
      input_file = route(file)

      directory = File.dirname(input_file)
      unless File.directory?(directory)
        report(directory)
        make(directory)
      end

      report(input_file)
      if template?(file)
        dump(transform(load(output_file), context), input_file)
      else
        copy(output_file, input_file)
      end
    end

    def template?(file)
      File.extname(file) == '.erb'
    end

    def find(file)
      File.join(source, file)
    end

    def route(file)
      File.join(destination, file).gsub(/\.erb$/, '')
    end

    def report(message)
      puts "Creating '#{ message }'..."
    end

    def make(directory)
      FileUtils.mkdir_p(directory)
    end

    def copy(output_file, input_file)
      FileUtils.cp(output_file, input_file)
    end

    def load(file)
      File.read(file)
    end

    def dump(content, file)
      File.open(file, 'w') { |file| file.write(content) }
    end

    def transform(content, context)
      context.singleton_class.class_eval('def get_binding; binding; end')
      ERB.new(content).result(context.get_binding)
    end
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
rail-0.1.1	lib/support/generator.rb
rail-0.1.0	lib/support/generator.rb
rail-0.0.8	lib/support/generator.rb