Fix infinite loop with keep_sorted = 1.

When a subcommand finishes, _post_excecute() is called for sorting,
archiving and writing the file. But sorting is also a subcommand, which
in turn also calls _post_execute(), etc, etc.

So let the caller of _execute() decide when to call _post_execute.

This fixes issue #46.

topydo/cli/CLI.py

@@ -55,6 +55,8 @@ class CLIApplication(CLIApplicationBase):
 
         if self._execute(subcommand, args) == False:
             sys.exit(1)
+        else:
+            self._post_execute()
 
 def main():
     """ Main entry point of the CLI. """

topydo/cli/CLIApplicationBase.py

@@ -193,12 +193,16 @@ class CLIApplicationBase(object):
             self._input())
 
         if command.execute() != False:
-            self._post_execute()
             return True
 
         return False
 
     def _post_execute(self):
+        """
+        Should be called when executing the user requested command has been
+        completed. It will do some maintenance and write out the final result
+        to the todo.txt file.
+        """
         if self.todolist.is_dirty():
             self._archive()