First attempt at archiving todos to a separate file.

ArchiveCommand.py

+import Command
+import Config
+
+class ArchiveCommand(Command.Command):
+    def __init__(self, p_todolist, p_archive_list):
+        super(ArchiveCommand, self).__init__([], p_todolist)
+        self.archive = p_archive_list
+
+    def execute(self):
+        for todo in [t for t in self.todolist.todos() if t.is_completed()]:
+            self.archive.add_todo(todo)
+            self.todolist.delete(todo.attributes['number'])

Config.py

@@ -7,7 +7,7 @@ COLORS = True
 HIGHLIGHT_PROJECTS_CONTEXTS = True
 
 FILENAME = 'todo.txt'
-COMPLETED_FILENAME = 'done.txt'
+ARCHIVE_FILENAME = 'done.txt'
 
 TAG_START = 't'
 TAG_DUE = 'due'

Main.py

@@ -5,6 +5,7 @@ import sys
 
 from AddCommand import AddCommand
 from AppendCommand import AppendCommand
+from ArchiveCommand import ArchiveCommand
 from DepCommand import DepCommand
 import Config
 from DoCommand import DoCommand
@@ -40,14 +41,28 @@ class CLIApplication(object):
     def __init__(self):
         self.todolist = TodoList.TodoList([])
 
+    def archive(self):
+        """
+        Performs an archive action on the todolist.
+
+        This means that all completed tasks are moved to the archive file
+        (defaults to done.txt).
+        """
+        archive_file = TodoFile.TodoFile(Config.ARCHIVE_FILENAME)
+        archive = TodoList.TodoList(archive_file.read())
+
+        if archive:
+            command = ArchiveCommand(self.todolist, archive)
+            command.execute()
+
+            if archive.is_dirty():
+                archive_file.write(archive)
+
+
     def run(self):
         """ Main entry function. """
         todofile = TodoFile.TodoFile(Config.FILENAME)
-
-        try:
         self.todolist = TodoList.TodoList(todofile.read())
-        except Exception:
-            pass # TODO
 
         try:
             subcommand = sys.argv[1]
@@ -82,10 +97,11 @@ class CLIApplication(object):
             lambda e: sys.stderr.write(e + "\n"),
             raw_input)
 
-        if not command.execute():
+        if command.execute() == False:
             exit(1)
 
         if self.todolist.is_dirty():
+            # self.archive()
             todofile.write(str(self.todolist))
 
 if __name__ == '__main__':

TodoFile.py

@@ -13,10 +13,13 @@ class TodoFile(object):
 
     def read(self):
         """ Reads the todo.txt file and returns a list of todo items.  """
-
+        todos = []
+        try:
             todofile = open(self.path, 'r')
             todos = todofile.readlines()
             todofile.close()
+        except IOError:
+            pass
 
         return todos