Don't let GrepFilter deal with integer expressions.

Just make sure that proper arguments are passed to GrepFilter in the
first place.

test/FilterTest.py

@@ -185,13 +185,6 @@ class FilterTest(TopydoTest):
         self.assertEqual(todolist_to_string(filtered_todos), \
             todolist_to_string(reference))
 
-    def test_filter19(self):
-        todos = load_file('test/data/FilterTest1.txt')
-        grep = Filter.GrepFilter(1)
-        filtered_todos = grep.filter(todos)
-
-        self.assertEqual(filtered_todos, [])
-
     def test_filter20(self):
         todos = load_file('test/data/FilterTest3.txt')
         otf = Filter.OrdinalTagFilter('due:<2014-11-10')

topydo/lib/Filter.py

@@ -15,7 +15,6 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import re
-from six import text_type
 
 from topydo.lib.Config import config
 from topydo.lib.RelativeDate import relative_date_to_date
@@ -64,7 +63,7 @@ class GrepFilter(Filter):
         super(GrepFilter, self).__init__()
 
         # convert to string in case we receive integers
-        self.expression = text_type(p_expression)
+        self.expression = p_expression
 
         if p_case_sensitive != None:
             self.case_sensitive = p_case_sensitive

topydo/lib/TodoListBase.py

@@ -20,6 +20,7 @@ A list of todo items.
 
 from datetime import date
 import re
+from six import text_type
 
 from topydo.lib.Config import config
 from topydo.lib import Filter
@@ -124,7 +125,8 @@ class TodoListBase(object):
             result = todo_by_linenumber(p_identifier)
 
         if not result:
-            result = todo_by_regexp(p_identifier)
+            # convert integer to text so we pass on a valid regex
+            result = todo_by_regexp(text_type(p_identifier))
 
         return result