Rename method for consistency.

Command.py

@@ -27,7 +27,7 @@ class Command(object):
 
         p_args is a list of arguments that can be passed to this subcommand.
         These can be retrieved with argument(), or the existence of an argument
-        using argumentShift().
+        using argument_shift().
 
         p_todolist is a reference to the todolist instance to operate on.
 
@@ -53,7 +53,7 @@ class Command(object):
         Execute the command. Intercepts the help subsubcommand to show the help
         text.
         """
-        if self.argumentShift("help"):
+        if self.argument_shift("help"):
             self.error(self.usage() + "\n\n" + self.help())
             return False
 
@@ -69,7 +69,7 @@ class Command(object):
 
         return value
 
-    def argumentShift(self, p_expr):
+    def argument_shift(self, p_expr):
         """
         Returns true when the first argument equals the given expression.
         """

DoCommand.py

@@ -30,7 +30,7 @@ class DoCommand(Command):
         super(DoCommand, self).__init__(p_args, p_todolist, p_out, p_err, p_prompt)
 
         self.number = None
-        self.force = self.argumentShift("--force") or self.argumentShift("-f")
+        self.force = self.argument_shift("--force") or self.argument_shift("-f")
 
         try:
             self.number = convert_todo_number(self.argument(0))

ListCommand.py

@@ -30,7 +30,7 @@ class ListCommand(Command.Command):
         if not super(ListCommand, self).execute():
             return False
 
-        show_all = self.argumentShift("-x")
+        show_all = self.argument_shift("-x")
 
         sorter = Sorter.Sorter(Config.SORT_STRING)
         filters = [] if show_all else [Filter.DependencyFilter(self.todolist), Filter.RelevanceFilter()]