Refactorized listeners support

Added polling fallback
Removed sys-uname dependency

Gemfile

@@ -1,3 +1,12 @@
 source "http://rubygems.org"
 
 gemspec
+
+require 'rbconfig'
+
+if Config::CONFIG['target_os'] =~ /darwin/i
+  gem 'rb-fsevent', '>= 0.3.2'
+end
+if Config::CONFIG['target_os'] =~ /linux/i
+  gem 'rb-inotify', '>= 0.5.1'
+end

README.rdoc

@@ -4,17 +4,17 @@ Guard is a command line tool to easly handle events on files modifications.
 
 == Features
 
-- FSEvent support on Mac OS X (without RubyCocoa!)
-- Inotify support on Linux (beta)
-- Super fast change detection
+- FSEvent support on Mac OS X 10.5+ (without RubyCocoa!, please install {rb-fsevent, >= 0.3.2}[https://rubygems.org/gems/rb-fsevent])
+- Inotify support on Linux (beta, please install {rb-inotify, >= 0.5.1}[https://rubygems.org/gems/rb-inotify])
+- Polling for others (help us to support more systems)
+- Super fast change detection (when polling not used)
 - Automatic files modifications detection (even new files are detected)
 - Growl notification (please install {growlnotify}[http://growl.info/documentation/growlnotify.php])
 - Libnotify notification
+- Tested on Ruby 1.8.7 & 1.9.2.
 
 == Install
 
-Only Mac OS X (10.5+) & Linux are supported. Tested on Ruby 1.8.7 & 1.9.2.
-
 Install the gem:
 
     gem install guard
@@ -35,9 +35,13 @@ Just launch Guard inside your ruby/rails project with:
 
     guard
 
+Shell can be cleared after each change with:
+
+    guard -c
+
 Options list is available with:
 
-    guard help
+    guard help [TASK]
 
 Signal handlers are used to interact with Guard:
 
@@ -65,7 +69,7 @@ Add it to your Gemfile (inside test group):
 
     gem '<guard-name>'
 
-Add guard definition to your Guardfile with:
+Add guard definition to your Guardfile by running this command:
 
     guard init <guard-name>
 

Rakefile

@@ -8,7 +8,7 @@ task :default => :spec
 namespace(:spec) do
   desc "Run all specs on multiple ruby versions (requires rvm)"
   task(:portability) do
-    %w[1.8.7  1.9.2].each do |version|
+    %w[1.8.7 1.9.2 jruby].each do |version|
       system <<-BASH
         bash -c 'source ~/.rvm/scripts/rvm;
                  rvm #{version};

bin/inotify_watch

@@ -1,25 +0,0 @@
-#!/usr/bin/env ruby
-require 'rubygems'
-require 'rb-inotify'
-
-folders = Array.new
-notifier = INotify::Notifier.new
-
-notifier.watch(ARGV.first || '.', :modify, :recursive) do |event|
-  dir = File.expand_path(File.dirname(event.absolute_name)) + '/'
-  if !folders.include?(dir)
-    folders << dir
-  end
-end
-
-while true do
-  notifier.process
-  
-  if !folders.empty?
-    $stdout.puts folders.join(' ')
-    $stdout.flush
-    folders.clear
-  end
-  
-  sleep(0.1)
-end

ext/extconf.rb

@@ -1,18 +0,0 @@
-# Workaround to make Rubygems believe it builds a native gem
-require 'mkmf'
-create_makefile('none')
-
-if `uname -s`.chomp == 'Darwin'
-  gem_root      = File.expand_path(File.join('..'))
-  darwin_verion = `uname -r`.to_i
-  sdk_verion    = { 9 => '10.5', 10 => '10.6', 11 => '10.7' }[darwin_verion]
-  
-  raise "Darwin #{darwin_verion} is not supported" unless sdk_verion
-  
-  # Compile the actual fsevent_watch binary
-  system("CFLAGS='-isysroot /Developer/SDKs/MacOSX#{sdk_verion}.sdk -mmacosx-version-min=#{sdk_verion}' /usr/bin/gcc -framework CoreServices -o '#{gem_root}/bin/fsevent_watch' fsevent/fsevent_watch.c")
-  
-  unless File.executable?("#{gem_root}/bin/fsevent_watch")
-    raise "Compilation of fsevent_watch failed (see README)"
-  end
-end

ext/fsevent/fsevent_watch.c

@@ -1,44 +0,0 @@
-#include <CoreServices/CoreServices.h>
-
-void callback(ConstFSEventStreamRef streamRef,
-  void *clientCallBackInfo,
-  size_t numEvents,
-  void *eventPaths,
-  const FSEventStreamEventFlags eventFlags[],
-  const FSEventStreamEventId eventIds[]
-) {
-  // Print modified dirs
-  int i;
-  char **paths = eventPaths;
-  for (i = 0; i < numEvents; i++) {
-    printf("%s", paths[i]);
-    printf(" ");
-  }
-  printf("\n");
-  fflush(stdout);
-}
-
-int main (int argc, const char * argv[]) {
-  // Create event stream
-  CFStringRef pathToWatch = CFStringCreateWithCString(kCFAllocatorDefault, argv[1], kCFStringEncodingUTF8);
-  CFArrayRef pathsToWatch = CFArrayCreate(NULL, (const void **)&pathToWatch, 1, NULL);  
-  void *callbackInfo = NULL;
-  FSEventStreamRef stream;
-  CFAbsoluteTime latency = 0.1;
-  stream = FSEventStreamCreate(
-    kCFAllocatorDefault,
-    callback,
-    callbackInfo,
-    pathsToWatch,
-    kFSEventStreamEventIdSinceNow,
-    latency,
-    kFSEventStreamCreateFlagNone
-  );
-  
-  // Add stream to run loop
-  FSEventStreamScheduleWithRunLoop(stream, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
-  FSEventStreamStart(stream);
-  CFRunLoopRun();
-  
-  return 2;
-}

guard.gemspec

@@ -15,20 +15,17 @@ Gem::Specification.new do |s|
   s.required_rubygems_version = '>= 1.3.6'
   s.rubyforge_project = 'guard'
   
-  s.add_development_dependency  'rspec',       '~> 2.0.0.rc'
-  s.add_development_dependency  'guard-rspec', '~> 0.1.0'
+  s.add_development_dependency  'rspec',       '~> 2.0.0'
+  s.add_development_dependency  'guard-rspec', '~> 0.1.3'
   
   s.add_dependency 'bundler',    '~> 1.0.2'
   s.add_dependency 'thor',       '~> 0.14.3'
-  s.add_dependency 'sys-uname',  '~> 0.8.4'
   # Mac OS X
   s.add_dependency 'growl',      '~> 1.0.3'
   # Linux
-  s.add_dependency 'rb-inotify', '~> 0.8.1'
   s.add_dependency 'libnotify',  '~> 0.1.3'
   
-  s.files        = Dir.glob('{bin,images,lib,ext}/**/*') + %w[LICENSE README.rdoc]
-  s.extensions   = ['ext/extconf.rb']
+  s.files        = Dir.glob('{bin,images,lib}/**/*') + %w[LICENSE README.rdoc]
   s.executable   = 'guard'
   s.require_path = 'lib'
 end

lib/guard.rb

@@ -14,7 +14,7 @@ module Guard
     
     def start(options = {})
       @options  = options
-      @listener = Listener.new
+      @listener = Listener.init
       @guards   = []
       
       Dsl.evaluate_guardfile
@@ -59,7 +59,7 @@ module Guard
     
     def run
       listener.stop
-      UI.clear if options[:clear]
+      UI. clear if options[:clear]
       yield
       listener.start
     end

lib/guard/listener.rb

@@ -1,51 +1,39 @@
-require 'sys/uname'
+require 'rbconfig'
 
 module Guard
+  
+  autoload :Darwin,  'guard/listeners/darwin'
+  autoload :Linux,   'guard/listeners/linux'
+  autoload :Polling, 'guard/listeners/polling'
+  
   class Listener
-    attr_reader :last_event, :callback, :pipe
+    attr_reader :last_event
+    
+    def self.init
+      if mac? && Darwin.usable?
+        Darwin.new
+      elsif linux? && Linux.usable?
+        Linux.new
+      else
+        UI.info "Using polling (Please help us to support your system better than that.)"
+        Polling.new
+      end
+    end
     
     def initialize
       update_last_event
     end
     
-    def on_change(&block)
-      @callback = block
-    end
-    
-    def start
-      @pipe = case Sys::Uname.sysname
-      when 'Darwin'
-        IO.popen("#{bin_path}/fsevent_watch .")
-      when 'Linux'
-        IO.popen("#{bin_path}/inotify_watch .")
-      end
-      watch_change
-    end
-    
-    def stop
-      Process.kill("HUP", pipe.pid) if pipe
-    end
-    
   private
     
-    def watch_change
-      while !pipe.eof?
-        if line = pipe.readline
-          modified_dirs = line.split(" ")
-          files = modified_files(modified_dirs)
-          update_last_event
-          callback.call(files)
-        end
-      end
-    end
-    
-    def modified_files(dirs)
-      files = potentially_modified_files(dirs).select { |file| recent_file?(file) }
+    def modified_files(dirs, options = {})
+      files = potentially_modified_files(dirs, options).select { |path| File.file?(path) && recent_file?(path) }
       files.map! { |file| file.gsub("#{Dir.pwd}/", '') }
     end
     
-    def potentially_modified_files(dirs)
-      Dir.glob(dirs.map { |dir| "#{dir}*" })
+    def potentially_modified_files(dirs, options = {})
+      match = options[:all] ? "**/*" : "*"
+      Dir.glob(dirs.map { |dir| "#{dir}#{match}" })
     end
     
     def recent_file?(file)
@@ -58,8 +46,12 @@ module Guard
       @last_event = Time.now
     end
     
-    def bin_path
-      File.expand_path(File.join(File.dirname(__FILE__), '..', '..', 'bin'))
+    def self.mac?
+      Config::CONFIG['target_os'] =~ /darwin/i
+    end
+    
+    def self.linux?
+      Config::CONFIG['target_os'] =~ /linux/i
     end
     
   end

lib/guard/listeners/darwin.rb

@@ -0,0 +1,40 @@
+module Guard
+  class Darwin < Listener
+    attr_reader :fsevent
+    
+    def initialize
+      super
+      @fsevent = FSEvent.new
+    end
+    
+    def on_change(&callback)
+      @fsevent.watch Dir.pwd do |modified_dirs|
+        files = modified_files(modified_dirs)
+        update_last_event
+        callback.call(files)
+      end
+    end
+    
+    def start
+      @fsevent.run
+    end
+    
+    def stop
+      @fsevent.stop
+    end
+    
+    def self.usable?
+      require 'rb-fsevent'
+      if !defined?(FSEvent::VERSION) || Gem::Version.new(FSEvent::VERSION) < Gem::Version.new('0.3.2')
+        UI.info "Please update rb-fsevent (>= 0.3.2)"
+        false
+      else
+        true
+      end
+    rescue LoadError
+      UI.info "Please install rb-fsevent gem for Mac OSX FSEvents support"
+      false
+    end
+    
+  end
+end

lib/guard/listeners/linux.rb

@@ -0,0 +1,58 @@
+module Guard
+  class Linux < Listener
+    attr_reader :inotify, :files, :latency, :callback
+    
+    def initialize
+      @inotify = INotify::Notifier.new
+      @files   = []
+      @latency = 0.5
+    end
+    
+    def on_change(&callback)
+      @callback = callback
+      inotify.watch(Dir.pwd, :recursive, :attrib, :modify, :create) do |event|
+        unless event.name == "" # Event on root directory
+          @files << event.absolute_name
+        end
+      end
+    end
+    
+    def start
+      @stop = false
+      watch_change
+    end
+    
+    def stop
+      @stop = true
+      inotify.stop
+    end
+    
+    def self.usable?
+      require 'rb-inotify'
+      if !defined?(INotify::VERSION) || Gem::Version.new(INotify::VERSION) < Gem::Version.new('0.5.1')
+        UI.info "Please update rb-inotify (>= 0.5.1)"
+        false
+      else
+        true
+      end
+    rescue LoadError
+      UI.info "Please install rb-inotify gem for Linux inotify support"
+      false
+    end
+    
+  private
+    
+    def watch_change
+      while !@stop
+        inotify.process
+        unless files.empty?
+          files.map! { |file| file.gsub("#{Dir.pwd}/", '') }
+          callback.call(files)
+          files.clear
+        end
+        sleep latency
+      end
+    end
+    
+  end
+end

lib/guard/listeners/polling.rb

@@ -0,0 +1,37 @@
+module Guard
+  class Polling < Listener
+    attr_reader :callback, :latency
+    
+    def initialize
+      super
+      @latency = 1.5
+    end
+    
+    def on_change(&callback)
+      @callback = callback
+    end
+    
+    def start
+      @stop = false
+      watch_change
+    end
+    
+    def stop
+      @stop = true
+    end
+    
+  private
+    
+    def watch_change
+      while !@stop
+        start = Time.now.to_f
+        files = modified_files([Dir.pwd + '/'], :all => true)
+        update_last_event
+        callback.call(files) unless files.empty?
+        nap_time = latency - (Time.now.to_f - start)
+        sleep(nap_time) if nap_time > 0
+      end
+    end
+    
+  end
+end

lib/guard/notifier.rb

@@ -1,10 +1,10 @@
-require 'sys/uname'
+require 'rbconfig'
 require 'pathname'
 
-case Sys::Uname.sysname
-when 'Darwin'
+case Config::CONFIG['target_os']
+when /darwin/i
   require 'growl'
-when 'Linux'
+when /linux/i
   require 'libnotify'
 end
 
@@ -15,10 +15,10 @@ module Guard
       unless ENV["GUARD_ENV"] == "test"
         image = options[:image] || :success
         title = options[:title] || "Guard"
-        case Sys::Uname.sysname
-        when 'Darwin'
+        case Config::CONFIG['target_os']
+        when /darwin/i
           Growl.notify message, :title => title, :icon => image_path(image), :name => "Guard"
-        when 'Linux'
+        when /linux/i
           Libnotify.show :body => message, :summary => title, :icon_path => image_path(image)
         end
       end

spec/guard/listener_spec.rb

@@ -1,25 +1,31 @@
 require 'spec_helper'
 
 describe Guard::Listener do
-  subject { described_class.new }
+  subject { described_class }
   
-  its(:last_event) { should < Time.now }
-  
-  describe "start" do
-    let(:pipe_mock) { mock("pipe", :eof? => true) }
+  describe "init" do
     
-    it "should use fsevent_watch on Mac OS X" do
-      Sys::Uname.stub(:sysname).and_return('Darwin')
-      IO.should_receive(:popen).with(/.*\/fsevent_watch\s\./).and_return(pipe_mock)
-      subject.start
+    before(:each) { @target_os = Config::CONFIG['target_os'] }
+    after(:each) { Config::CONFIG['target_os'] = @target_os }
+    
+    it "should use darwin listener on Mac OS X" do
+      Config::CONFIG['target_os'] = 'darwin10.4.0'
+      Guard::Darwin.should_receive(:new)
+      subject.init
     end
     
-    it "should use inotify_watch on Linux" do
-      Sys::Uname.stub(:sysname).and_return('Linux')
-      IO.should_receive(:popen).with(/.*\/inotify_watch\s\./).and_return(pipe_mock)
-      subject.start
+    it "should use polling listener on Windows" do
+      Config::CONFIG['target_os'] = 'win32'
+      Guard::Polling.should_receive(:new)
+      subject.init
     end
     
+    # it "should use inotify_watch on Linux" do
+    #   # Sys::Uname.stub(:sysname).and_return('Linux')
+    #   IO.should_receive(:popen).with(/.*\/inotify_watch\s\./).and_return(pipe_mock)
+    #   subject.start
+    # end
+    
   end
   
 end

spec/guard/listeners/darwin_spec.rb

@@ -0,0 +1,73 @@
+require 'spec_helper'
+require 'guard/listeners/darwin'
+
+describe Guard::Darwin do
+  subject { Guard::Darwin }
+  
+  if linux?
+    it "should not be usable on linux" do
+      subject.should_not be_usable
+    end
+  end
+  
+  if mac?
+    it "should be usable on 10.6" do
+      subject.should be_usable
+    end
+    
+    describe "watch" do
+      before(:each) do
+        @results = []
+        @listener = Guard::Darwin.new
+        @listener.on_change do |files|
+          @results += files
+        end
+      end
+      
+      it "should catch 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 "should catch 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 "should catch 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 1
+    Thread.new { @listener.start }
+    sleep 1
+  end
+  
+  def stop
+    sleep 1
+    @listener.stop
+  end
+  
+end

spec/guard/listeners/linux_spec.rb

@@ -0,0 +1,73 @@
+require 'spec_helper'
+require 'guard/listeners/linux'
+
+describe Guard::Linux do
+  subject { Guard::Linux }
+  
+  if mac?
+    it "should not be usable on 10.6" do
+      subject.should_not be_usable
+    end
+  end
+  
+  if linux?
+    it "should be usable on linux" do
+      subject.should_not be_usable
+    end
+    
+    describe "watch" do
+      before(:each) do
+        @results = []
+        @listener = Guard::Linux.new
+        @listener.on_change do |files|
+          @results += files
+        end
+      end
+      
+      it "should catch 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 "should catch 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 "should catch 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 1
+    Thread.new { @listener.start }
+    sleep 1
+  end
+  
+  def stop
+    sleep 1
+    @listener.stop
+  end
+  
+end

spec/guard/listeners/polling_spec.rb

@@ -0,0 +1,57 @@
+require 'spec_helper'
+require 'guard/listeners/polling'
+
+describe Guard::Polling do
+  
+  before(:each) do
+    @results = []
+    @listener = Guard::Polling.new
+    @listener.on_change do |files|
+      @results += files
+    end
+  end
+  
+  it "should catch 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 "should catch 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 "should catch 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
+  
+private
+  
+  def start
+    Thread.new { @listener.start }
+    sleep 1
+  end
+  
+  def stop
+    sleep 3
+    @listener.stop
+  end
+  
+end

spec/guard/notifier_spec.rb

@@ -6,25 +6,28 @@ describe Guard::Notifier do
   describe "notify" do
     before(:each) { ENV["GUARD_ENV"] = 'special_test' }
     
-    it "should use Growl on Mac OS X" do
-      Sys::Uname.stub(:sysname).and_return('Darwin')
-      Growl.should_receive(:notify).with("great",
-        :title => "Guard",
-        :icon  => Pathname.new(File.dirname(__FILE__)).join('../../images/success.png').to_s,
-        :name  => "Guard"
-      )
-      subject.notify 'great', :title => 'Guard'
+    if mac?
+      it "should use Growl on Mac OS X" do
+        Growl.should_receive(:notify).with("great",
+          :title => "Guard",
+          :icon  => Pathname.new(File.dirname(__FILE__)).join('../../images/success.png').to_s,
+          :name  => "Guard"
+        )
+        subject.notify 'great', :title => 'Guard'
+      end
     end
     
-    # it "should use Libnotify on Linux" do
-    #   Sys::Uname.stub(:sysname).and_return('Linux')
-    #   Libnotify.should_receive(:show).with(
-    #     :body      => "great",
-    #     :summary   => 'Guard',
-    #     :icon_path => 'image/path'
-    #   )
-    #   subject.notify 'great', 'Guard', 'image/path'
-    # end
+    if linux?
+      it "should use Libnotify on Linux" do
+        Sys::Uname.stub(:sysname).and_return('Linux')
+        Libnotify.should_receive(:show).with(
+          :body      => "great",
+          :summary   => 'Guard',
+          :icon_path => 'image/path'
+        )
+        subject.notify 'great', 'Guard', 'image/path'
+      end
+    end
     
     after(:each) { ENV["GUARD_ENV"] = 'test' }
   end

spec/spec_helper.rb

@@ -2,16 +2,16 @@ require 'rubygems'
 require 'guard'
 require 'rspec'
 
-fixture_path = Pathname.new(File.expand_path('../fixtures/', __FILE__))
+Dir["#{File.expand_path('..', __FILE__)}/support/**/*.rb"].each { |f| require f }
+
+puts "Please do not update/create files while tests are running."
 
 RSpec.configure do |config|
   config.color_enabled = true
   
   config.before(:each) do
     ENV["GUARD_ENV"] = 'test'
-    @fixture_path = fixture_path
+    @fixture_path = Pathname.new(File.expand_path('../fixtures/', __FILE__))
   end
   
-  config.after(:all) do
-  end
 end

spec/support/platform_helper.rb

@@ -0,0 +1,7 @@
+def mac?
+  Config::CONFIG['target_os'] =~ /darwin/i
+end
+
+def linux?
+  Config::CONFIG['target_os'] =~ /linux/i
+end