Added aur_only mode for yaourt backend

i3pystatus/updates/yaourt.py

@@ -1,18 +1,25 @@
 """
 This module counts the available updates using yaourt.
-You should not use it together with the pacman backend otherwise
-some packeges might be counted twice.
+By default it will only count aur packages.
+If you want to count both pacman and aur packages set the variable
+count_only_aur = False
 """
-
+import re
 from i3pystatus.core.command import run_through_shell
 from i3pystatus.updates import Backend
 
 
 class Yaourt(Backend):
-
+    def __init__(self, aur_only = True):
+        self.aur_only = aur_only
+    
     @property
+    
     def updates(self):
         command = ["yaourt", "-Qua"]
         checkupdates = run_through_shell(command)
-        return checkupdates.out.count('\n')
+        if(self.aur_only):
+            return len( re.findall("^aur/",  checkupdates.out, flags=re.M) )
+        return checkupdates.out.count("\n")
+
 Backend = Yaourt