can specify directory to listen to, still defaulting to pwd

lib/guard/listener.rb

@@ -8,7 +8,7 @@ module Guard
   autoload :Polling, 'guard/listeners/polling'
 
   class Listener
-    attr_reader :last_event, :sha1_checksums_hash
+    attr_reader :last_event, :sha1_checksums_hash, :directory
 
     def self.select_and_init
       if mac? && Darwin.usable?
@@ -23,7 +23,8 @@ module Guard
       end
     end
 
-    def initialize
+    def initialize(directory=Dir.pwd)
+      @directory = directory
       @sha1_checksums_hash = {}
       update_last_event
     end
@@ -34,7 +35,7 @@ module Guard
 
     def modified_files(dirs, options = {})
       files = potentially_modified_files(dirs, options).select { |path| File.file?(path) && file_modified?(path) && file_content_modified?(path) }
-      files.map! { |file| file.gsub("#{Dir.pwd}/", '') }
+      files.map! { |file| file.gsub("#{directory}/", '') }
     end
 
   private

lib/guard/listeners/darwin.rb

@@ -8,7 +8,7 @@ module Guard
     end
 
     def on_change(&callback)
-      @fsevent.watch Dir.pwd do |modified_dirs|
+      @fsevent.watch directory do |modified_dirs|
         files = modified_files(modified_dirs)
         update_last_event
         callback.call(files)

lib/guard/listeners/linux.rb

@@ -22,7 +22,7 @@ module Guard
 
     def on_change(&callback)
       @callback = callback
-      inotify.watch(Dir.pwd, :recursive, :modify, :create, :delete, :move) do |event|
+      inotify.watch(directory, :recursive, :modify, :create, :delete, :move) do |event|
         unless event.name == "" # Event on root directory
           @files << event.absolute_name
         end
@@ -61,7 +61,7 @@ module Guard
 
           unless files.empty?
             files.uniq!
-            files.map! { |file| file.gsub("#{Dir.pwd}/", '') }
+            files.map! { |file| file.gsub("#{directory}/", '') }
             callback.call(files)
             files.clear
           end

lib/guard/listeners/polling.rb

@@ -25,7 +25,7 @@ module Guard
     def watch_change
       until @stop
         start = Time.now.to_f
-        files = modified_files([Dir.pwd + '/'], :all => true)
+        files = modified_files([directory + '/'], :all => true)
         update_last_event
         callback.call(files) unless files.empty?
         nap_time = latency - (Time.now.to_f - start)

lib/guard/listeners/windows.rb

@@ -8,7 +8,7 @@ module Guard
     end
 
     def on_change(&callback)
-      @fchange.watch(Dir.pwd, :all_events, :recursive) do |event|
+      @fchange.watch(directory, :all_events, :recursive) do |event|
         paths = [File.expand_path(event.watcher.path) + '/']
         files = modified_files(paths, {:all => true})
         update_last_event