add support for Windows using rb-fchange. Specs fail because of k32WaitForMultipleObjects blocks all threads

Gemfile

@@ -14,4 +14,5 @@ if Config::CONFIG['target_os'] =~ /linux/i
 end
 if Config::CONFIG['target_os'] =~ /mswin|mingw/i
   gem 'win32console'
+  gem 'rb-fchange', :git => 'git://github.com/stereobooster/rb-fchange.git'
 end

lib/guard/listener.rb

@@ -4,6 +4,7 @@ module Guard
 
   autoload :Darwin,  'guard/listeners/darwin'
   autoload :Linux,   'guard/listeners/linux'
+  autoload :Windows, 'guard/listeners/windows'
   autoload :Polling, 'guard/listeners/polling'
 
   class Listener
@@ -14,6 +15,8 @@ module Guard
         Darwin.new
       elsif linux? && Linux.usable?
         Linux.new
+      elsif windows? && Windows.usable?
+        Windows.new
       else
         UI.info "Using polling (Please help us to support your system better than that.)"
         Polling.new
@@ -54,6 +57,10 @@ module Guard
       Config::CONFIG['target_os'] =~ /linux/i
     end
 
+    def self.windows?
+      Config::CONFIG['target_os'] =~ /mswin|mingw/i
+    end
+
   end
 end
 

lib/guard/listeners/windows.rb

@@ -0,0 +1,35 @@
+module Guard
+  class Windows < Listener
+    attr_reader :fchange
+
+    def initialize
+      super
+      @fchange = FChange::Notifier.new
+    end
+
+    def on_change(&callback)
+      @fchange.watch Dir.pwd, :all_events do |event|
+        files = modified_files([event.watcher.path])
+        update_last_event
+        callback.call(files)
+      end
+    end
+
+    def start
+      @fchange.run
+    end
+
+    def stop
+      @fchange.stop
+    end
+
+    def self.usable?
+      require 'rb-fchange'
+      true
+    rescue LoadError
+      UI.info "Please install rb-fchange gem for Windows file events support"
+      false
+    end
+
+  end
+end

spec/guard/listener_spec.rb

@@ -14,10 +14,10 @@ describe Guard::Listener do
       subject.select_and_init
     end
 
-    it "uses polling listener on Windows" do
+    it "uses windows listener on Windows" do
       Config::CONFIG['target_os'] = 'win32'
-      Guard::Polling.stub(:usable?).and_return(true)
+      Guard::Windows.stub(:usable?).and_return(true)
-      Guard::Polling.should_receive(:new)
+      Guard::Windows.should_receive(:new)
       subject.select_and_init
     end
 

spec/guard/listeners/windows_spec.rb

@@ -0,0 +1,79 @@
+require 'spec_helper'
+require 'guard/listeners/windows'
+
+describe Guard::Windows do
+  subject { Guard::Windows }
+
+  if linux?
+    it "isn't usable on linux" do
+      subject.should_not be_usable
+    end
+  end
+
+  if mac?
+    it "isn't usable on Mac" do
+      subject.should_not be_usable
+    end
+  end
+
+  if windows?
+    it "is usable on Windows 2000 and later" do
+      subject.should be_usable
+    end
+
+    describe "#on_change" do
+      before(:each) do
+        @results = []
+        @listener = Guard::Windows.new
+        @listener.on_change do |files|
+          @results += files
+        end
+      end
+
+      it "catches new file" do
+        file = @fixture_path.join("newfile.rb")
+        File.exists?(file).should be_false
+        start
+        FileUtils.touch file
+        stop
+        File.delete file
+        @results.should == ['spec/fixtures/newfile.rb']
+      end
+
+      it "catches file update" do
+        file = @fixture_path.join("folder1/file1.txt")
+        File.exists?(file).should be_true
+        start
+        FileUtils.touch file
+        stop
+        @results.should == ['spec/fixtures/folder1/file1.txt']
+      end
+
+      it "catches files update" do
+        file1 = @fixture_path.join("folder1/file1.txt")
+        file2 = @fixture_path.join("folder1/folder2/file2.txt")
+        File.exists?(file1).should be_true
+        File.exists?(file2).should be_true
+        start
+        FileUtils.touch file1
+        FileUtils.touch file2
+        stop
+        @results.should == ['spec/fixtures/folder1/file1.txt', 'spec/fixtures/folder1/folder2/file2.txt']
+      end
+    end
+  end
+
+private
+
+  def start
+    sleep 0.6
+    Thread.new { @listener.start }
+    sleep 0.6
+  end
+
+  def stop
+    sleep 0.6
+    @listener.stop
+  end
+
+end

spec/support/platform_helper.rb

@@ -5,3 +5,7 @@ end
 def linux?
   Config::CONFIG['target_os'] =~ /linux/i
 end
+
+def windows?
+  Config::CONFIG['target_os'] =~ /mswin|mingw/i
+end