# File railties/lib/rails_generator/commands.rb, line 157
        def class_collisions(*class_names)
          class_names.flatten.each do |class_name|
            # Convert to string to allow symbol arguments.
            class_name = class_name.to_s

            # Skip empty strings.
            next if class_name.strip.empty?

            # Split the class from its module nesting.
            nesting = class_name.split('::')
            name = nesting.pop

            # Extract the last Module in the nesting.
            last = nesting.inject(Object) { |last, nest|
              break unless last.const_defined?(nest)
              last.const_get(nest)
            }

            # If the last Module exists, check whether the given
            # class exists and raise a collision if so.
            if last and last.const_defined?(name.camelize)
              raise_class_collision(class_name)
            end
          end
        end

# File railties/lib/rails_generator/commands.rb, line 288
        def complex_template(relative_source, relative_destination, template_options = {})
          options = template_options.dup
          options[:assigns] ||= {}
          options[:assigns]['template_for_inclusion'] = render_template_part(template_options)
          template(relative_source, relative_destination, options)
        end

# File railties/lib/rails_generator/commands.rb, line 297
        def directory(relative_path)
          path = destination_path(relative_path)
          if File.exists?(path)
            logger.exists relative_path
          else
            logger.create relative_path
      unless options[:pretend]
        FileUtils.mkdir_p(path)
        
        # Subversion doesn't do path adds, so we need to add
        # each directory individually.
        # So stack up the directory tree and add the paths to
        # subversion in order without recursion.
        if options[:svn]
    stack=[relative_path]
    until File.dirname(stack.last) == stack.last # dirname('.') == '.'
      stack.push File.dirname(stack.last)
    end
    stack.reverse_each do |rel_path|
      svn_path = destination_path(rel_path)
      system("svn add -N #{svn_path}") unless File.directory?(File.join(svn_path, '.svn'))
    end
        end
      end
    end
  end

# File railties/lib/rails_generator/commands.rb, line 196
        def file(relative_source, relative_destination, file_options = {}, &block)
          # Determine full paths for source and destination files.
          source              = source_path(relative_source)
          destination         = destination_path(relative_destination)
          destination_exists  = File.exists?(destination)

          # If source and destination are identical then we're done.
          if destination_exists and identical?(source, destination, &block)
            return logger.identical(relative_destination) 
          end

          # Check for and resolve file collisions.
          if destination_exists

            # Make a choice whether to overwrite the file.  :force and
            # :skip already have their mind made up, but give :ask a shot.
            choice = case (file_options[:collision] || options[:collision]).to_sym #|| :ask
              when :ask   then force_file_collision?(relative_destination, source, destination, file_options, &block)
              when :force then :force
              when :skip  then :skip
              else raise "Invalid collision option: #{options[:collision].inspect}"
            end

            # Take action based on our choice.  Bail out if we chose to
            # skip the file; otherwise, log our transgression and continue.
            case choice
              when :force then logger.force(relative_destination)
              when :skip  then return(logger.skip(relative_destination))
              else raise "Invalid collision choice: #{choice}.inspect"
            end

          # File doesn't exist so log its unbesmirched creation.
          else
            logger.create relative_destination
          end

          # If we're pretending, back off now.
          return if options[:pretend]

          # Write destination file with optional shebang.  Yield for content
          # if block given so templaters may render the source file.  If a
          # shebang is requested, replace the existing shebang or insert a
          # new one.
          File.open(destination, 'wb') do |dest|
            dest.write render_file(source, file_options, &block)
          end

          # Optionally change permissions.
          if file_options[:chmod]
            FileUtils.chmod(file_options[:chmod], destination)
          end

          # Optionally add file to subversion
          system("svn add #{destination}") if options[:svn]
        end

# File railties/lib/rails_generator/commands.rb, line 255
        def identical?(source, destination, &block)
          return false if File.directory? destination
          source      = block_given? ? File.open(source) {|sf| yield(sf)} : IO.read(source)
          destination = IO.read(destination)
          source == destination
        end

# File railties/lib/rails_generator/commands.rb, line 333
        def migration_template(relative_source, relative_destination, template_options = {})
          migration_directory relative_destination
          migration_file_name = template_options[:migration_file_name] || file_name
          raise "Another migration is already named #{migration_file_name}: #{existing_migrations(migration_file_name).first}" if migration_exists?(migration_file_name)
          template(relative_source, "#{relative_destination}/#{next_migration_string}_#{migration_file_name}.rb", template_options)
        end

# File railties/lib/rails_generator/commands.rb, line 325
        def readme(*relative_sources)
          relative_sources.flatten.each do |relative_source|
            logger.readme relative_source
            puts File.read(source_path(relative_source)) unless options[:pretend]
          end
        end

# File railties/lib/rails_generator/commands.rb, line 340
        def route_resources(*resources)
          resource_list = resources.map { |r| r.to_sym.inspect }.join(', ')
          sentinel = 'ActionController::Routing::Routes.draw do |map|'

          logger.route "map.resources #{resource_list}"
          unless options[:pretend]
            gsub_file 'config/routes.rb', /(#{Regexp.escape(sentinel)})/mi do |match|
              "#{match}\n  map.resources #{resource_list}\n"
            end
          end
        end

# File railties/lib/rails_generator/commands.rb, line 276
        def template(relative_source, relative_destination, template_options = {})
          file(relative_source, relative_destination, template_options) do |file|
            # Evaluate any assignments in a temporary, throwaway binding.
            vars = template_options[:assigns] || {}
            b = binding
            vars.each { |k,v| eval "#{k} = vars[:#{k}] || vars['#{k}']", b }

            # Render the source file with the temporary binding.
            ERB.new(file.read, nil, '-').result(b)
          end
        end

# File railties/lib/rails_generator/commands.rb, line 388
          def find_synonyms(word)
            require 'open-uri'
            require 'timeout'
            timeout(5) do
              open(SYNONYM_LOOKUP_URI % word) do |stream|
                data = stream.read.gsub("&nbsp;", " ").gsub("<BR>", "")
                data.scan(/^Sense \d+\n.+?\n\n/m)
              end
            end
          rescue Exception
            return nil
          end

# File railties/lib/rails_generator/commands.rb, line 372
          def raise_class_collision(class_name)
            message = "  The name '\#{class_name}' is reserved by Ruby on Rails.\n  Please choose an alternative and run this generator again.\n"
            if suggest = find_synonyms(class_name)
              message << "\n  Suggestions:  \n\n"
              message << suggest.join("\n")
            end
            raise UsageError, message
          end

# File railties/lib/rails_generator/commands.rb, line 353
          def render_file(path, options = {})
            File.open(path, 'rb') do |file|
              if block_given?
                yield file
              else
                content = ''
                if shebang = options[:shebang]
                  content << "#!#{shebang}\n"
                  if line = file.gets
                    content << "line\n" if line !~ /^#!/
                  end
                end
                content << file.read
              end
            end
          end