Implement 'after', 'before' and 'partof' operators.

test/DepCommandTest.py

 # Topydo - A todo.txt client written in Python.
 # Copyright (C) 2014 Bram Schoenmakers <me@bramschoenmakers.nl>
-# 
+#
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation, either version 3 of the License, or
 # (at your option) any later version.
-# 
+#
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
-# 
+#
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
@@ -72,6 +72,34 @@ class DepCommandTest(CommandTest.CommandTest):
         self.assertFalse(self.todolist.is_dirty())
         self.assertEquals(self.output, "")
         self.assertEquals(self.errors, command.usage() + "\n")
+
+    def test_add6(self):
+        command = DepCommand.DepCommand(["add", "1", "after", "4"], self.todolist, self.out, self.error)
+        command.execute()
+
+        self.assertTrue(self.todolist.is_dirty())
+        self.assertTrue(self.todolist.todo(4).has_tag('p', '1'))
+        self.assertEquals(self.output, "")
+        self.assertEquals(self.errors, "")
+
+    def test_add7(self):
+        command = DepCommand.DepCommand(["add", "1", "before", "4"], self.todolist, self.out, self.error)
+        command.execute()
+
+        self.assertTrue(self.todolist.is_dirty())
+        self.assertTrue(self.todolist.todo(1).has_tag('p', '2'))
+        self.assertEquals(self.output, "")
+        self.assertEquals(self.errors, "")
+
+    def test_add8(self):
+        command = DepCommand.DepCommand(["add", "1", "partof", "4"], self.todolist, self.out, self.error)
+        command.execute()
+
+        self.assertTrue(self.todolist.is_dirty())
+        self.assertTrue(self.todolist.todo(1).has_tag('p', '2'))
+        self.assertEquals(self.output, "")
+        self.assertEquals(self.errors, "")
+
     def rm_helper(self, p_args):
         """
         Helper function that checks the removal of the dependency from todo 1

topydo/lib/DepCommand.py

@@ -51,13 +51,19 @@ class DepCommand(Command):
         to_todo = None
 
         try:
-            from_todo_nr = convert_todo_number(self.argument(1))
-            to_todo_nr = self.argument(2)
+            operator = self.argument(2)
 
-            if to_todo_nr == 'to':
+            if operator == 'before' or operator == 'partof':
+                from_todo_nr = convert_todo_number(self.argument(3))
+                to_todo_nr = convert_todo_number(self.argument(1))
+            elif operator == 'to' or operator == 'after':
+                from_todo_nr = convert_todo_number(self.argument(1))
                 to_todo_nr = convert_todo_number(self.argument(3))
             else:
-                to_todo_nr = convert_todo_number(to_todo_nr)
+                # the operator was omitted, assume 2nd argument is target task
+                # default to 'to' behavior
+                from_todo_nr = convert_todo_number(self.argument(1))
+                to_todo_nr = convert_todo_number(self.argument(2))
 
             from_todo = self.todolist.todo(from_todo_nr)
             to_todo = self.todolist.todo(to_todo_nr)
@@ -119,12 +125,13 @@ class DepCommand(Command):
     def usage(self):
         return """Synopsis:
   dep <add|rm> <NUMBER> [to] <NUMBER>
+  dep add <NUMBER> <before|partof|after> <NUMBER>
   dep ls <NUMBER> to
   dep ls to <NUMBER>
   dep clean"""
 
     def help(self):
-        return """* add: Adds a dependency.
+        return """* add: Adds a dependency. Using 1 before 2 creates a dependency from todo item 2 to 1.
 * rm (alias: del): Removes a dependency.
 * ls: Lists all dependencies to or from a certain todo.
 * clean (alias: gc): Removes redundant id or p tags."""