Fresh start

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diff --git a/jni/ruby/lib/rake/clean.rb b/jni/ruby/lib/rake/clean.rb
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+# The 'rake/clean' file defines two file lists (CLEAN and CLOBBER) and
+# two rake tasks (:clean and :clobber).
+#
+# [:clean] Clean up the project by deleting scratch files and backup
+#          files.  Add files to the CLEAN file list to have the :clean
+#          target handle them.
+#
+# [:clobber] Clobber all generated and non-source files in a project.
+#            The task depends on :clean, so all the clean files will
+#            be deleted as well as files in the CLOBBER file list.
+#            The intent of this task is to return a project to its
+#            pristine, just unpacked state.
+
+require 'rake'
+
+# :stopdoc:
+
+module Rake
+  module Cleaner
+    extend FileUtils
+
+    module_function
+
+    def cleanup_files(file_names)
+      file_names.each do |file_name|
+        cleanup(file_name)
+      end
+    end
+
+    def cleanup(file_name, opts={})
+      begin
+        rm_r file_name, opts
+      rescue StandardError => ex
+        puts "Failed to remove #{file_name}: #{ex}" unless file_already_gone?(file_name)
+      end
+    end
+
+    def file_already_gone?(file_name)
+      return false if File.exist?(file_name)
+
+      path = file_name
+      prev = nil
+
+      while path = File.dirname(path)
+        return false if cant_be_deleted?(path)
+        break if [prev, "."].include?(path)
+        prev = path
+      end
+      true
+    end
+    private_class_method :file_already_gone?
+
+    def cant_be_deleted?(path_name)
+      File.exist?(path_name) &&
+        (!File.readable?(path_name) || !File.executable?(path_name))
+    end
+    private_class_method :cant_be_deleted?
+  end
+end
+
+CLEAN = ::Rake::FileList["**/*~", "**/*.bak", "**/core"]
+CLEAN.clear_exclude.exclude { |fn|
+  fn.pathmap("%f").downcase == 'core' && File.directory?(fn)
+}
+
+desc "Remove any temporary products."
+task :clean do
+  Rake::Cleaner.cleanup_files(CLEAN)
+end
+
+CLOBBER = ::Rake::FileList.new
+
+desc "Remove any generated file."
+task :clobber => [:clean] do
+  Rake::Cleaner.cleanup_files(CLOBBER)
+end