Change droidgap create to not use 'grep' and have better error messages

lib/classic.rb

@@ -49,8 +49,16 @@ class Classic
   # runs android create project
   # TODO need to allow more flexible SDK targetting via config.xml
   def create_android
-    target_id = `android list targets | grep id:`.split("\n").last.match(/\d+/).to_a.first
+    IO.popen("android list targets") { |f| 
+      targets = f.readlines(nil)[0].scan(/id\:.*$/)
+      if (targets.length > 0) 
+        target_id = targets.last.match(/\d+/).to_a.first
         `android create project -t #{ target_id } -k #{ @pkg } -a #{ @name } -n #{ @name } -p #{ @path }`
+      else
+        puts "No Android targets found. Please run 'android' and install at least one SDK package."
+        puts "If that makes no sense then you need to go read the Android SDK documentation."
+      end
+    }
   end
   
   # copies the project/www folder into tmp/android/www

lib/create.rb

@@ -29,8 +29,8 @@ class Create < Classic
     @content          = 'index.html'
     
     # stop executation on errors
-    raise 'No index.html found!' unless File.exists? File.join(path, 'index.html')    
+    raise 'Expected index.html in the following folder #{ path }.\nThe path is expected to be the directory droidgap create is run from or specified as a command line arg like droidgap create my_path.' unless File.exists? File.join(path, 'index.html')    
-    raise 'Could not find android in your path!' if @android_sdk_path.empty?
+    raise 'Could not find android in your PATH!' if @android_sdk_path.empty?
   end
 
   # reads in a config.xml file