ExtensionTask now generated clean and clobber tasks.

These new tasks remove temporary (build files) and binaries
already built.

.gitignore

@@ -1,2 +1,3 @@
 coverage
+doc/html
 tmp

features/compile.feature

@@ -51,3 +51,21 @@ Feature: Compile C code into Ruby extensions.
     And output of rake task 'compile:extension_one' do not contain /extension_two/
     And binary extension 'extension_one' do exist in 'lib'
     And binary extension 'extension_two' do not exist in 'lib'
+
+  Scenario: removing temporary files
+    Given a safe project directory
+    And scaffold code for extension 'extension_one'
+    And I've already successfully executed rake task 'compile'
+    When rake task 'clean' is invoked
+    Then rake task 'clean' succeeded
+    And binary extension 'extension_one' do exist in 'lib'
+    And 'tmp' folder do not exist
+
+  Scenario: clobbering binary and temporary files
+    Given a safe project directory
+    And scaffold code for extension 'extension_one'
+    And I've already successfully executed rake task 'compile'
+    When rake task 'clobber' is invoked
+    Then rake task 'clobber' succeeded
+    And binary extension 'extension_one' do not exist in 'lib'
+    And 'tmp' folder do not exist

features/step_definitions/folders.rb

@@ -18,5 +18,9 @@
 end
 
 Then /^'(.*)' folder is created$/ do |folder|
-  File.exist?(folder).should be_true
+  File.directory?(folder).should be_true
+end
+
+Then /^'(.*)' folder do not exist$/ do |folder|
+  File.directory?(folder).should_not be_true
 end

lib/rake/extensiontask.rb

@@ -4,6 +4,7 @@
 # gem developer/creators.
 
 require 'rake'
+require 'rake/clean'
 require 'rake/tasklib'
 require 'rbconfig'
 
@@ -38,6 +39,9 @@ def define
       directory "#{@tmp_dir}/#{@name}"
       directory @lib_dir
 
+      # temporary dir should be on the cleaning
+      CLEAN.include(@tmp_dir)
+
       # makefile depends of tmp_dir and config_script
       # tmp/extension_name/Makefile
       file makefile => [tmp_path, extconf] do
@@ -61,10 +65,13 @@ def define
         cp tmp_binary, lib_binary
       end
 
+      # clobbering should remove the binaries from lib_path
+      CLOBBER.include(lib_binary)
+
       desc "Compile just the #{@name} extension"
       task "compile:#{@name}" => [lib_binary]
 
-      desc "Compile the extension(s)"
+      desc "Compile the extension(s)" unless Rake::Task.task_defined?('compile')
       task "compile" => ["compile:#{@name}"]
     end
 

spec/lib/rake/extensiontask_spec.rb

@@ -137,6 +137,18 @@
           Rake::Task["tmp/extension_one/Makefile"].prerequisites.should include("ext/extension_one/extconf.rb")
         end
       end
+
+      describe 'clean' do
+        it "should include 'tmp' in the pattern" do
+          CLEAN.should include('tmp')
+        end
+      end
+
+      describe 'clobber' do
+        it "should include 'lib/extension_one.{so,bundle}'" do
+          CLOBBER.should include("lib/#{ext_bin('extension_one')}")
+        end
+      end
     end
   end