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+#--
+# Copyright (c) 2003, 2004 Jim Weirich, 2009 Eric Hodel
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#++
+
+require 'rubygems'
+begin
+  gem 'rdoc'
+rescue Gem::LoadError
+end unless defined?(RDoc)
+
+begin
+  gem 'rake'
+rescue Gem::LoadError
+end unless defined?(Rake)
+
+require 'rdoc'
+require 'rake'
+require 'rake/tasklib'
+
+##
+# RDoc::Task creates the following rake tasks to generate and clean up RDoc
+# output:
+#
+# [rdoc]
+#   Main task for this RDoc task.
+#
+# [clobber_rdoc]
+#   Delete all the rdoc files.  This target is automatically added to the main
+#   clobber target.
+#
+# [rerdoc]
+#   Rebuild the rdoc files from scratch, even if they are not out of date.
+#
+# Simple Example:
+#
+#   require 'rdoc/task'
+#
+#   RDoc::Task.new do |rdoc|
+#     rdoc.main = "README.rdoc"
+#     rdoc.rdoc_files.include("README.rdoc", "lib/**/*.rb")
+#   end
+#
+# The +rdoc+ object passed to the block is an RDoc::Task object. See the
+# attributes list for the RDoc::Task class for available customization options.
+#
+# == Specifying different task names
+#
+# You may wish to give the task a different name, such as if you are
+# generating two sets of documentation.  For instance, if you want to have a
+# development set of documentation including private methods:
+#
+#   require 'rdoc/task'
+#
+#   RDoc::Task.new :rdoc_dev do |rdoc|
+#     rdoc.main = "README.doc"
+#     rdoc.rdoc_files.include("README.rdoc", "lib/**/*.rb")
+#     rdoc.options << "--all"
+#   end
+#
+# The tasks would then be named :<em>rdoc_dev</em>,
+# :clobber_<em>rdoc_dev</em>, and :re<em>rdoc_dev</em>.
+#
+# If you wish to have completely different task names, then pass a Hash as
+# first argument. With the <tt>:rdoc</tt>, <tt>:clobber_rdoc</tt> and
+# <tt>:rerdoc</tt> options, you can customize the task names to your liking.
+#
+# For example:
+#
+#   require 'rdoc/task'
+#
+#   RDoc::Task.new(:rdoc => "rdoc", :clobber_rdoc => "rdoc:clean",
+#                  :rerdoc => "rdoc:force")
+#
+# This will create the tasks <tt>:rdoc</tt>, <tt>:rdoc:clean</tt> and
+# <tt>:rdoc:force</tt>.
+
+class RDoc::Task < Rake::TaskLib
+
+  ##
+  # Name of the main, top level task.  (default is :rdoc)
+
+  attr_accessor :name
+
+  ##
+  # Comment markup format.  rdoc, rd and tomdoc are supported.  (default is
+  # 'rdoc')
+
+  attr_accessor :markup
+
+  ##
+  # Name of directory to receive the html output files. (default is "html")
+
+  attr_accessor :rdoc_dir
+
+  ##
+  # Title of RDoc documentation. (defaults to rdoc's default)
+
+  attr_accessor :title
+
+  ##
+  # Name of file to be used as the main, top level file of the RDoc. (default
+  # is none)
+
+  attr_accessor :main
+
+  ##
+  # Name of template to be used by rdoc. (defaults to rdoc's default)
+
+  attr_accessor :template
+
+  ##
+  # Name of format generator (<tt>--format<tt>) used by rdoc. (defaults to
+  # rdoc's default)
+
+  attr_accessor :generator
+
+  ##
+  # List of files to be included in the rdoc generation. (default is [])
+
+  attr_accessor :rdoc_files
+
+  ##
+  # Additional list of options to be passed rdoc.  (default is [])
+
+  attr_accessor :options
+
+  ##
+  # Whether to run the rdoc process as an external shell (default is false)
+
+  attr_accessor :external
+
+  ##
+  # Create an RDoc task with the given name. See the RDoc::Task class overview
+  # for documentation.
+
+  def initialize name = :rdoc # :yield: self
+    defaults
+
+    check_names name
+
+    @name = name
+
+    yield self if block_given?
+
+    define
+  end
+
+  ##
+  # Ensures that +names+ only includes names for the :rdoc, :clobber_rdoc and
+  # :rerdoc.  If other names are given an ArgumentError is raised.
+
+  def check_names names
+    return unless Hash === names
+
+    invalid_options =
+      names.keys.map { |k| k.to_sym } - [:rdoc, :clobber_rdoc, :rerdoc]
+
+    unless invalid_options.empty? then
+      raise ArgumentError, "invalid options: #{invalid_options.join ', '}"
+    end
+  end
+
+  ##
+  # Task description for the clobber rdoc task or its renamed equivalent
+
+  def clobber_task_description
+    "Remove RDoc HTML files"
+  end
+
+  ##
+  # Sets default task values
+
+  def defaults
+    @name = :rdoc
+    @rdoc_files = Rake::FileList.new
+    @rdoc_dir = 'html'
+    @main = nil
+    @title = nil
+    @template = nil
+    @generator = nil
+    @options = []
+  end
+
+  ##
+  # All source is inline now.  This method is deprecated
+
+  def inline_source # :nodoc:
+    warn "RDoc::Task#inline_source is deprecated"
+    true
+  end
+
+  ##
+  # All source is inline now.  This method is deprecated
+
+  def inline_source=(value) # :nodoc:
+    warn "RDoc::Task#inline_source is deprecated"
+  end
+
+  ##
+  # Create the tasks defined by this task lib.
+
+  def define
+    desc rdoc_task_description
+    task rdoc_task_name
+
+    desc rerdoc_task_description
+    task rerdoc_task_name => [clobber_task_name, rdoc_task_name]
+
+    desc clobber_task_description
+    task clobber_task_name do
+      rm_r @rdoc_dir rescue nil
+    end
+
+    task :clobber => [clobber_task_name]
+
+    directory @rdoc_dir
+
+    rdoc_target_deps = [
+      @rdoc_files,
+      Rake.application.rakefile
+    ].flatten.compact
+
+    task rdoc_task_name => [rdoc_target]
+    file rdoc_target => rdoc_target_deps do
+      @before_running_rdoc.call if @before_running_rdoc
+      args = option_list + @rdoc_files
+
+      $stderr.puts "rdoc #{args.join ' '}" if Rake.application.options.trace
+      RDoc::RDoc.new.document args
+    end
+
+    self
+  end
+
+  ##
+  # List of options that will be supplied to RDoc
+
+  def option_list
+    result = @options.dup
+    result << "-o"       << @rdoc_dir
+    result << "--main"   << main      if main
+    result << "--markup" << markup    if markup
+    result << "--title"  << title     if title
+    result << "-T"       << template  if template
+    result << '-f'       << generator if generator
+    result
+  end
+
+  ##
+  # The block passed to this method will be called just before running the
+  # RDoc generator. It is allowed to modify RDoc::Task attributes inside the
+  # block.
+
+  def before_running_rdoc(&block)
+    @before_running_rdoc = block
+  end
+
+  ##
+  # Task description for the rdoc task or its renamed equivalent
+
+  def rdoc_task_description
+    'Build RDoc HTML files'
+  end
+
+  ##
+  # Task description for the rerdoc task or its renamed description
+
+  def rerdoc_task_description
+    "Rebuild RDoc HTML files"
+  end
+
+  private
+
+  def rdoc_target
+    "#{rdoc_dir}/created.rid"
+  end
+
+  def rdoc_task_name
+    case name
+    when Hash then (name[:rdoc] || "rdoc").to_s
+    else           name.to_s
+    end
+  end
+
+  def clobber_task_name
+    case name
+    when Hash then (name[:clobber_rdoc] || "clobber_rdoc").to_s
+    else           "clobber_#{name}"
+    end
+  end
+
+  def rerdoc_task_name
+    case name
+    when Hash then (name[:rerdoc] || "rerdoc").to_s
+    else           "re#{name}"
+    end
+  end
+
+end
+
+# :stopdoc:
+module Rake
+
+  ##
+  # For backwards compatibility
+
+  RDocTask = RDoc::Task
+
+end
+# :startdoc:
+