Deal with empty lines.

A line is considered a todo item when it contains at least one
non-whitespace character.

TodoList.py

@@ -2,6 +2,8 @@
 A list of todo items.
 """
 
+import re
+
 import Todo
 
 class TodoList(object):
@@ -20,7 +22,7 @@ class TodoList(object):
         """
         self._todos = []
         for string in p_todostrings:
-            self._todos.append(Todo.Todo(string))
+            self.add(string)
 
     def todo(self, p_number):
         """
@@ -40,8 +42,10 @@ class TodoList(object):
         """
         Given a todo string, parse it and put it to the end of the list.
         """
-        todo = Todo.Todo(p_src)
-        self._todos.append(todo)
+
+        if re.search(r'\S', p_src):
+            todo = Todo.Todo(p_src)
+            self._todos.append(todo)
 
     def delete(self, p_number):
         """ Deletes a todo item from the list. """

test/TodoListTest.py

 """ Tests for the TodoList class. """
 
 import datetime
+import re
 import unittest
 
 import TodoFile
@@ -9,7 +10,8 @@ import TodoList
 class TodoListTester(unittest.TestCase):
     def setUp(self):
         self.todofile = TodoFile.TodoFile('TodoListTest.txt')
-        lines = self.todofile.read()
+        lines = [line for line in self.todofile.read() \
+                       if re.search(r'\S', line)]
         self.text = ''.join(lines)
         self.todolist = TodoList.TodoList(lines)
 
@@ -86,3 +88,7 @@ class TodoListTester(unittest.TestCase):
         # readlines() always ends a string with \n, but join() in str(todolist)
         # doesn't necessarily.
         self.assertEquals(str(self.todolist) + '\n', self.text)
+
+    def test_count(self):
+        """ Test that empty lines are not counted. """
+        self.assertEquals(self.todolist.count(), 5)

test/TodoListTest.txt

@@ -2,4 +2,5 @@
 (D) Bar @Context2 +Project2
 (C) Baz @Context1 +Project1 key:value
 (C) Drink beer @ home
+
 (C) 13 + 29 = 42