Fresh start

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diff --git a/jni/ruby/lib/rake/task.rb b/jni/ruby/lib/rake/task.rb
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+require 'rake/invocation_exception_mixin'
+
+module Rake
+
+  ##
+  # A Task is the basic unit of work in a Rakefile.  Tasks have associated
+  # actions (possibly more than one) and a list of prerequisites.  When
+  # invoked, a task will first ensure that all of its prerequisites have an
+  # opportunity to run and then it will execute its own actions.
+  #
+  # Tasks are not usually created directly using the new method, but rather
+  # use the +file+ and +task+ convenience methods.
+  #
+  class Task
+    # List of prerequisites for a task.
+    attr_reader :prerequisites
+
+    # List of actions attached to a task.
+    attr_reader :actions
+
+    # Application owning this task.
+    attr_accessor :application
+
+    # Array of nested namespaces names used for task lookup by this task.
+    attr_reader :scope
+
+    # File/Line locations of each of the task definitions for this
+    # task (only valid if the task was defined with the detect
+    # location option set).
+    attr_reader :locations
+
+    # Return task name
+    def to_s
+      name
+    end
+
+    def inspect # :nodoc:
+      "<#{self.class} #{name} => [#{prerequisites.join(', ')}]>"
+    end
+
+    # List of sources for task.
+    attr_writer :sources
+    def sources
+      if defined?(@sources)
+        @sources
+      else
+        prerequisites
+      end
+    end
+
+    # List of prerequisite tasks
+    def prerequisite_tasks
+      prerequisites.map { |pre| lookup_prerequisite(pre) }
+    end
+
+    def lookup_prerequisite(prerequisite_name) # :nodoc:
+      application[prerequisite_name, @scope]
+    end
+    private :lookup_prerequisite
+
+    # List of all unique prerequisite tasks including prerequisite tasks'
+    # prerequisites.
+    # Includes self when cyclic dependencies are found.
+    def all_prerequisite_tasks
+      seen = {}
+      collect_prerequisites(seen)
+      seen.values
+    end
+
+    def collect_prerequisites(seen) # :nodoc:
+      prerequisite_tasks.each do |pre|
+        next if seen[pre.name]
+        seen[pre.name] = pre
+        pre.collect_prerequisites(seen)
+      end
+    end
+    protected :collect_prerequisites
+
+    # First source from a rule (nil if no sources)
+    def source
+      sources.first
+    end
+
+    # Create a task named +task_name+ with no actions or prerequisites. Use
+    # +enhance+ to add actions and prerequisites.
+    def initialize(task_name, app)
+      @name            = task_name.to_s
+      @prerequisites   = []
+      @actions         = []
+      @already_invoked = false
+      @comments        = []
+      @lock            = Monitor.new
+      @application     = app
+      @scope           = app.current_scope
+      @arg_names       = nil
+      @locations       = []
+    end
+
+    # Enhance a task with prerequisites or actions.  Returns self.
+    def enhance(deps=nil, &block)
+      @prerequisites |= deps if deps
+      @actions << block if block_given?
+      self
+    end
+
+    # Name of the task, including any namespace qualifiers.
+    def name
+      @name.to_s
+    end
+
+    # Name of task with argument list description.
+    def name_with_args # :nodoc:
+      if arg_description
+        "#{name}#{arg_description}"
+      else
+        name
+      end
+    end
+
+    # Argument description (nil if none).
+    def arg_description # :nodoc:
+      @arg_names ? "[#{arg_names.join(',')}]" : nil
+    end
+
+    # Name of arguments for this task.
+    def arg_names
+      @arg_names || []
+    end
+
+    # Reenable the task, allowing its tasks to be executed if the task
+    # is invoked again.
+    def reenable
+      @already_invoked = false
+    end
+
+    # Clear the existing prerequisites and actions of a rake task.
+    def clear
+      clear_prerequisites
+      clear_actions
+      clear_comments
+      self
+    end
+
+    # Clear the existing prerequisites of a rake task.
+    def clear_prerequisites
+      prerequisites.clear
+      self
+    end
+
+    # Clear the existing actions on a rake task.
+    def clear_actions
+      actions.clear
+      self
+    end
+
+    # Clear the existing comments on a rake task.
+    def clear_comments
+      @comments = []
+      self
+    end
+
+    # Invoke the task if it is needed.  Prerequisites are invoked first.
+    def invoke(*args)
+      task_args = TaskArguments.new(arg_names, args)
+      invoke_with_call_chain(task_args, InvocationChain::EMPTY)
+    end
+
+    # Same as invoke, but explicitly pass a call chain to detect
+    # circular dependencies.
+    def invoke_with_call_chain(task_args, invocation_chain) # :nodoc:
+      new_chain = InvocationChain.append(self, invocation_chain)
+      @lock.synchronize do
+        if application.options.trace
+          application.trace "** Invoke #{name} #{format_trace_flags}"
+        end
+        return if @already_invoked
+        @already_invoked = true
+        invoke_prerequisites(task_args, new_chain)
+        execute(task_args) if needed?
+      end
+    rescue Exception => ex
+      add_chain_to(ex, new_chain)
+      raise ex
+    end
+    protected :invoke_with_call_chain
+
+    def add_chain_to(exception, new_chain) # :nodoc:
+      exception.extend(InvocationExceptionMixin) unless
+        exception.respond_to?(:chain)
+      exception.chain = new_chain if exception.chain.nil?
+    end
+    private :add_chain_to
+
+    # Invoke all the prerequisites of a task.
+    def invoke_prerequisites(task_args, invocation_chain) # :nodoc:
+      if application.options.always_multitask
+        invoke_prerequisites_concurrently(task_args, invocation_chain)
+      else
+        prerequisite_tasks.each { |p|
+          prereq_args = task_args.new_scope(p.arg_names)
+          p.invoke_with_call_chain(prereq_args, invocation_chain)
+        }
+      end
+    end
+
+    # Invoke all the prerequisites of a task in parallel.
+    def invoke_prerequisites_concurrently(task_args, invocation_chain)# :nodoc:
+      futures = prerequisite_tasks.map do |p|
+        prereq_args = task_args.new_scope(p.arg_names)
+        application.thread_pool.future(p) do |r|
+          r.invoke_with_call_chain(prereq_args, invocation_chain)
+        end
+      end
+      futures.each { |f| f.value }
+    end
+
+    # Format the trace flags for display.
+    def format_trace_flags
+      flags = []
+      flags << "first_time" unless @already_invoked
+      flags << "not_needed" unless needed?
+      flags.empty? ? "" : "(" + flags.join(", ") + ")"
+    end
+    private :format_trace_flags
+
+    # Execute the actions associated with this task.
+    def execute(args=nil)
+      args ||= EMPTY_TASK_ARGS
+      if application.options.dryrun
+        application.trace "** Execute (dry run) #{name}"
+        return
+      end
+      application.trace "** Execute #{name}" if application.options.trace
+      application.enhance_with_matching_rule(name) if @actions.empty?
+      @actions.each do |act|
+        case act.arity
+        when 1
+          act.call(self)
+        else
+          act.call(self, args)
+        end
+      end
+    end
+
+    # Is this task needed?
+    def needed?
+      true
+    end
+
+    # Timestamp for this task.  Basic tasks return the current time for their
+    # time stamp.  Other tasks can be more sophisticated.
+    def timestamp
+      Time.now
+    end
+
+    # Add a description to the task.  The description can consist of an option
+    # argument list (enclosed brackets) and an optional comment.
+    def add_description(description)
+      return unless description
+      comment = description.strip
+      add_comment(comment) if comment && ! comment.empty?
+    end
+
+    def comment=(comment) # :nodoc:
+      add_comment(comment)
+    end
+
+    def add_comment(comment) # :nodoc:
+      return if comment.nil?
+      @comments << comment unless @comments.include?(comment)
+    end
+    private :add_comment
+
+    # Full collection of comments. Multiple comments are separated by
+    # newlines.
+    def full_comment
+      transform_comments("\n")
+    end
+
+    # First line (or sentence) of all comments. Multiple comments are
+    # separated by a "/".
+    def comment
+      transform_comments(" / ") { |c| first_sentence(c) }
+    end
+
+    # Transform the list of comments as specified by the block and
+    # join with the separator.
+    def transform_comments(separator, &block)
+      if @comments.empty?
+        nil
+      else
+        block ||= lambda { |c| c }
+        @comments.map(&block).join(separator)
+      end
+    end
+    private :transform_comments
+
+    # Get the first sentence in a string. The sentence is terminated
+    # by the first period or the end of the line. Decimal points do
+    # not count as periods.
+    def first_sentence(string)
+      string.split(/\.[ \t]|\.$|\n/).first
+    end
+    private :first_sentence
+
+    # Set the names of the arguments for this task. +args+ should be
+    # an array of symbols, one for each argument name.
+    def set_arg_names(args)
+      @arg_names = args.map { |a| a.to_sym }
+    end
+
+    # Return a string describing the internal state of a task.  Useful for
+    # debugging.
+    def investigation
+      result = "------------------------------\n"
+      result << "Investigating #{name}\n"
+      result << "class: #{self.class}\n"
+      result <<  "task needed: #{needed?}\n"
+      result <<  "timestamp: #{timestamp}\n"
+      result << "pre-requisites: \n"
+      prereqs = prerequisite_tasks
+      prereqs.sort! { |a, b| a.timestamp <=> b.timestamp }
+      prereqs.each do |p|
+        result << "--#{p.name} (#{p.timestamp})\n"
+      end
+      latest_prereq = prerequisite_tasks.map { |pre| pre.timestamp }.max
+      result <<  "latest-prerequisite time: #{latest_prereq}\n"
+      result << "................................\n\n"
+      return result
+    end
+
+    # ----------------------------------------------------------------
+    # Rake Module Methods
+    #
+    class << self
+
+      # Clear the task list.  This cause rake to immediately forget all the
+      # tasks that have been assigned.  (Normally used in the unit tests.)
+      def clear
+        Rake.application.clear
+      end
+
+      # List of all defined tasks.
+      def tasks
+        Rake.application.tasks
+      end
+
+      # Return a task with the given name.  If the task is not currently
+      # known, try to synthesize one from the defined rules.  If no rules are
+      # found, but an existing file matches the task name, assume it is a file
+      # task with no dependencies or actions.
+      def [](task_name)
+        Rake.application[task_name]
+      end
+
+      # TRUE if the task name is already defined.
+      def task_defined?(task_name)
+        Rake.application.lookup(task_name) != nil
+      end
+
+      # Define a task given +args+ and an option block.  If a rule with the
+      # given name already exists, the prerequisites and actions are added to
+      # the existing task.  Returns the defined task.
+      def define_task(*args, &block)
+        Rake.application.define_task(self, *args, &block)
+      end
+
+      # Define a rule for synthesizing tasks.
+      def create_rule(*args, &block)
+        Rake.application.create_rule(*args, &block)
+      end
+
+      # Apply the scope to the task name according to the rules for
+      # this kind of task.  Generic tasks will accept the scope as
+      # part of the name.
+      def scope_name(scope, task_name)
+#        (scope + [task_name]).join(':')
+        scope.path_with_task_name(task_name)
+      end
+
+    end # class << Rake::Task
+  end # class Rake::Task
+end