Expression-mode for del, depri, do, pri, postpone.

This required some refactoring in MultiCommand and ExpressionCommand.

Whole part about processing flags was refactored. Code related to flags
from DCommand was moved into MultiCommand and reused from there in all
"multi" commands.

New attribute: ExpressionCommand.last_argument. Should be set to True if
command is using the last argument as something other than todo ID or
part of an expression (as in case of postpone or pri). By default set to
False.

New method: MultiCommand.execute_not_multi(): wrapper for functionality
not connected with todo IDs (like `topydo edit` or `topydo edit -d`).

New attribute: MultiCommand.multi_mode: Should be set to True if user
wants to operate on multiple todo items. True by default.

New method: MultiCommand.get_todos_from_expr(): gets todo IDs based on
expression and puts it in MultiCommand.todos.

EditCommand._open_in_editor() now accepts only one argument - file to
editing. It handles now also OSError exceptions. It is used also to
opening todo.txt and done.txt.

MultiCommand.get_todos() doesn't accept anymore todo IDs as an argument.
Instead it's using inherited Expression.last_argument` to decide upon
where to find todo IDs.

topydo/commands/DepriCommand.py

@@ -25,8 +25,6 @@ class DepriCommand(MultiCommand):
         super(DepriCommand, self).__init__(
             p_args, p_todolist, p_out, p_err, p_prompt)
 
-        self.get_todos(self.args)
-
     def execute_multi_specific(self):
         try:
             self.printer.add_filter(PrettyPrinterNumbers(self.todolist))

topydo/commands/DoCommand.py

@@ -36,9 +36,13 @@ class DoCommand(DCommand):
 
     def get_flags(self):
         """ Additional flags. """
-        return ("d:s", ["date=", "strict"])
+        opts, long_opts = super(DoCommand, self).get_flags()
+
+        return ("d:s" + opts, ["date=", "strict"] + long_opts)
 
     def process_flag(self, p_opt, p_value):
+        super(DoCommand, self).process_flag(p_opt, p_value)
+
         if p_opt == "-s" or p_opt == "--strict":
             self.strict_recurrence = True
         elif p_opt == "-d" or p_opt == "--date":

topydo/commands/EditCommand.py

@@ -34,26 +34,25 @@ DEFAULT_EDITOR = 'vi'
 # cannot use super() inside the class itself
 BASE_TODOLIST = lambda tl: super(TodoList, tl)
 
-class EditCommand(MultiCommand, ExpressionCommand):
+class EditCommand(MultiCommand):
     def __init__(self, p_args, p_todolist, p_output, p_error, p_input):
         super(EditCommand, self).__init__(p_args, p_todolist, p_output,
             p_error, p_input)
 
+        if len(self.args) == 0:
+            self.multi_mode = False
+
         self.is_expression = False
         self.edit_archive = False
+        self.last_argument = False
 
-    def _process_flags(self):
-        opts, args = self.getopt('xed')
+    def get_flags(self):
+        return ("d", [])
 
-        for opt, value in opts:
-            if opt == '-d':
+    def process_flag(self, p_opt, p_value):
+        if p_opt == '-d':
             self.edit_archive = True
-            elif opt == '-x':
-                self.show_all = True
-            elif opt == '-e':
-                self.is_expression = True
-
-        self.args = args
+            self.multi_mode = False
 
     def _todos_to_temp(self):
         f = tempfile.NamedTemporaryFile()
@@ -102,35 +101,12 @@ class EditCommand(MultiCommand, ExpressionCommand):
         else:
             return None
 
-    def execute(self):
-        if not super(EditCommand, self).execute():
-            return False
-
+    def execute_multi_specific(self):
         self.printer.add_filter(PrettyPrinterNumbers(self.todolist))
 
-        if len(self.args) < 1:
-            todo = config().todotxt()
-
-            return self._open_in_editor(todo) == 0
-        else:
-            self._process_flags()
-
-            if self.edit_archive:
-                archive = config().archive()
-
-                return self._open_in_editor(archive) == 0
-
-            if self.is_expression:
-                self.todos = self._view().todos
-            else:
-                self.get_todos(self.args)
-
-            todo_errors = self._catch_todo_errors()
-
-            if not todo_errors:
         temp_todos = self._todos_to_temp()
 
-                if not self._open_in_editor(temp_todos):
+        if not self._open_in_editor(temp_todos.name):
             new_todos = self._todos_from_temp(temp_todos)
             if len(new_todos) == len(self.todos):
                 for todo in self.todos:
@@ -144,9 +120,16 @@ class EditCommand(MultiCommand, ExpressionCommand):
                             'number of supplied todo IDs.')
         else:
             self.error(self.usage())
+
+    def execute_not_multi(self):
+        if self.edit_archive:
+            archive = config().archive()
+
+            return self._open_in_editor(archive) == 0
         else:
-                for error in todo_errors:
-                    self.error(error)
+            todo = config().todotxt()
+
+            return self._open_in_editor(todo) == 0
 
     def usage(self):
         return """Synopsis:

topydo/commands/PostponeCommand.py

@@ -32,18 +32,15 @@ class PostponeCommand(MultiCommand):
             p_args, p_todolist, p_out, p_err, p_prompt)
 
         self.move_start_date = False
-        self._process_flags()
-        self.get_todos(self.args[:-1])
+        self.last_argument = True
 
-    def _process_flags(self):
-        opts, args = self.getopt('s')
+    def get_flags(self):
+        return("s", [])
 
-        for opt, _ in opts:
-            if opt == '-s':
+    def process_flag(self, p_opt, p_value):
+        if p_opt == '-s':
             self.move_start_date = True
 
-        self.args = args
-
     def execute_multi_specific(self):
         def _get_offset(p_todo):
             offset = p_todo.tag_value(

topydo/commands/PriorityCommand.py

@@ -26,7 +26,7 @@ class PriorityCommand(MultiCommand):
         super(PriorityCommand, self).__init__(
             p_args, p_todolist, p_out, p_err, p_prompt)
 
-        self.get_todos(self.args[:-1])
+        self.last_argument = True
 
     def execute_multi_specific(self):
         priority = None

topydo/lib/DCommand.py

@@ -35,29 +35,14 @@ class DCommand(MultiCommand):
 
         self.force = False
 
-        self.process_flags()
         self.length = len(self.todolist.todos()) # to determine newly activated todos
-        self.get_todos(self.args)
 
     def get_flags(self):
-        """ Default implementation of getting specific flags. """
-        return ("", [])
+        return ("f", ["force"])
 
-    def process_flag(self, p_option, p_value):
-        """ Default implementation of processing specific flags. """
-        pass
-
-    def process_flags(self):
-        opts, long_opts = self.get_flags()
-        opts, args = self.getopt("f" + opts, ["force"] + long_opts)
-
-        for opt, value in opts:
-            if opt == "-f" or opt == "--force":
+    def process_flag(self, p_opt, p_value):
+        if p_opt == "-f" or p_opt == "--force":
             self.force = True
-            else:
-                self.process_flag(opt, value)
-
-        self.args = args
 
     def _uncompleted_children(self, p_todo):
         return sorted(

topydo/lib/ExpressionCommand.py

@@ -35,13 +35,22 @@ class ExpressionCommand(Command):
 
         self.sort_expression = config().sort_string()
         self.show_all = False
+        # Commands using last argument differently (i.e as something other than
+        # todo ID/expression) have to set attribute below to True.
+        self.last_argument = False
 
     def _filters(self):
         filters = []
 
         def arg_filters():
             result = []
-            for arg in self.args:
+
+            if self.last_argument:
+                args = self.args[:-1]
+            else:
+                args = self.args
+
+            for arg in args:
                 if re.match(Filter.ORDINAL_TAG_MATCH, arg):
                     argfilter = Filter.OrdinalTagFilter(arg)
                 elif len(arg) > 1 and arg[0] == '-':

topydo/lib/MultiCommand.py

@@ -16,10 +16,10 @@
 
 from six import u
 
-from topydo.lib.Command import Command
+from topydo.lib.ExpressionCommand import ExpressionCommand
 from topydo.lib.TodoListBase import InvalidTodoException
 
-class MultiCommand(Command):
+class MultiCommand(ExpressionCommand):
     """
     A common class for operations that can work with multiple todo IDs.
     """
@@ -33,10 +33,45 @@ class MultiCommand(Command):
 
         self.todos = []
         self.invalid_numbers = []
+        self.is_expression = False
+        self.multi_mode = True
 
-    def get_todos(self, p_numbers):
+    def get_flags(self):
+        """ Default implementation of getting specific flags. """
+        return ("", [])
+
+    def process_flag(self, p_option, p_value):
+        """ Default implementation of processing specific flags. """
+        pass
+
+    def _process_flags(self):
+        opts, long_opts = self.get_flags()
+        opts, args = self.getopt("xe" + opts, long_opts)
+
+        for opt, value in opts:
+            if opt == '-x':
+                self.show_all = True
+            elif opt == '-e':
+                self.is_expression = True
+            else:
+                self.process_flag(opt, value)
+
+        self.args = args
+
+    def get_todos_from_expr(self):
+        self.todos = self._view().todos
+
+    def get_todos(self):
         """ Gets todo objects from supplied todo IDs """
-        for number in p_numbers:
+        if self.is_expression:
+            self.get_todos_from_expr()
+        else:
+            if self.last_argument:
+                numbers = self.args[:-1]
+            else:
+                numbers = self.args
+
+            for number in numbers:
                 try:
                     self.todos.append(self.todolist.todo(number))
                 except InvalidTodoException:
@@ -72,10 +107,23 @@ class MultiCommand(Command):
         """
         pass
 
+    def execute_not_multi(self):
+        """
+        Some commands can do something else besides operating on multiple todo
+        IDs. This method is a wrapper for those other operations.
+        """
+        pass
+
     def execute(self):
         if not super(MultiCommand, self).execute():
             return False
 
+        self._process_flags()
+
+        if not self.multi_mode:
+            self.execute_not_multi()
+        else:
+            self.get_todos()
             todo_errors = self._catch_todo_errors()
 
             if not todo_errors: