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# Rake DSL functions.
require 'rake/file_utils_ext'

module Rake

  ##
  # DSL is a module that provides #task, #desc, #namespace, etc.  Use this
  # when you'd like to use rake outside the top level scope.

  module DSL

    #--
    # Include the FileUtils file manipulation functions in the top
    # level module, but mark them private so that they don't
    # unintentionally define methods on other objects.
    #++

    include FileUtilsExt
    private(*FileUtils.instance_methods(false))
    private(*FileUtilsExt.instance_methods(false))

    private

    # Declare a basic task.
    #
    # Example:
    #   task :clobber => [:clean] do
    #     rm_rf "html"
    #   end
    #
    def task(*args, &block)
      Rake::Task.define_task(*args, &block)
    end


    # Declare a file task.
    #
    # Example:
    #   file "config.cfg" => ["config.template"] do
    #     open("config.cfg", "w") do |outfile|
    #       open("config.template") do |infile|
    #         while line = infile.gets
    #           outfile.puts line
    #         end
    #       end
    #     end
    #  end
    #
    def file(*args, &block)
      Rake::FileTask.define_task(*args, &block)
    end

    # Declare a file creation task.
    # (Mainly used for the directory command).
    def file_create(*args, &block)
      Rake::FileCreationTask.define_task(*args, &block)
    end

    # Declare a set of files tasks to create the given directories on
    # demand.
    #
    # Example:
    #   directory "testdata/doc"
    #
    def directory(*args, &block)
      result = file_create(*args, &block)
      dir, _ = *Rake.application.resolve_args(args)
      Rake.each_dir_parent(dir) do |d|
        file_create d do |t|
          mkdir_p t.name if ! File.exist?(t.name)
        end
      end
      result
    end

    # Declare a task that performs its prerequisites in
    # parallel. Multitasks does *not* guarantee that its prerequisites
    # will execute in any given order (which is obvious when you think
    # about it)
    #
    # Example:
    #   multitask :deploy => [:deploy_gem, :deploy_rdoc]
    #
    def multitask(*args, &block)
      Rake::MultiTask.define_task(*args, &block)
    end

    # Create a new rake namespace and use it for evaluating the given
    # block.  Returns a NameSpace object that can be used to lookup
    # tasks defined in the namespace.
    #
    # E.g.
    #
    #   ns = namespace "nested" do
    #     task :run
    #   end
    #   task_run = ns[:run] # find :run in the given namespace.
    #
    def namespace(name=nil, &block)
      name = name.to_s if name.kind_of?(Symbol)
      name = name.to_str if name.respond_to?(:to_str)
      unless name.kind_of?(String) || name.nil?
        raise ArgumentError, "Expected a String or Symbol for a namespace name"
      end
      Rake.application.in_namespace(name, &block)
    end

    # Declare a rule for auto-tasks.
    #
    # Example:
    #  rule '.o' => '.c' do |t|
    #    sh %{cc -o #{t.name} #{t.source}}
    #  end
    #
    def rule(*args, &block)
      Rake::Task.create_rule(*args, &block)
    end

    # Describe the next rake task.
    #
    # Example:
    #   desc "Run the Unit Tests"
    #   task :test => [:build]
    #     runtests
    #   end
    #
    def desc(description)
      Rake.application.last_description = description
    end

    # Import the partial Rakefiles +fn+.  Imported files are loaded
    # _after_ the current file is completely loaded.  This allows the
    # import statement to appear anywhere in the importing file, and yet
    # allowing the imported files to depend on objects defined in the
    # importing file.
    #
    # A common use of the import statement is to include files
    # containing dependency declarations.
    #
    # See also the --rakelibdir command line option.
    #
    # Example:
    #   import ".depend", "my_rules"
    #
    def import(*fns)
      fns.each do |fn|
        Rake.application.add_import(fn)
      end
    end

  end

  DeprecatedCommands = Object.new.extend(DSL)

  module DeprecatedObjectDSL # :nodoc:
    DSL.private_instance_methods(false).each do |name|
      line = __LINE__+1
      class_eval %{
        def #{name}(*args, &block)
          unless Rake.application.options.ignore_deprecate
            unless @rake_dsl_warning
              $stderr.puts "WARNING: Global access to Rake DSL methods is deprecated.  Please include"
              $stderr.puts "    ...  Rake::DSL into classes and modules which use the Rake DSL methods."
              @rake_dsl_warning = true
            end
            $stderr.puts "WARNING: DSL method \#{self.class}##{name} called at \#{caller.first}"
          end
          Rake::DeprecatedCommands.send(:#{name}, *args, &block)
        end
        private :#{name}
      }, __FILE__, line
    end
  end unless defined? Rake::REDUCE_COMPAT

  extend FileUtilsExt
end

# Extend the main object with the DSL commands. This allows top-level
# calls to task, etc. to work from a Rakefile without polluting the
# object inheritance tree.
self.extend Rake::DSL
include Rake::DeprecatedObjectDSL unless defined? Rake::REDUCE_COMPAT