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Improve accounting scripts.
[misc] / todo.py
diff --git a/todo.py b/todo.py
index 3ea09b0d7b7e42b4893c15b7274b7de85c7343bf..6c84ee0dbe8e5d7b05fe00d625ef3342b972d97a 100644 (file)
--- a/todo.py
+++ b/todo.py
@@ -87,6 +87,7 @@ class Task:
         self.comment = comment
 
         self.visible = True
+        self.dependers = [] 
 
     @classmethod
     def from_dict(cls, db, d, id_):
@@ -113,9 +114,20 @@ class Task:
     def subtasks(self):
         subtasks = []
         for id_ in self.subtask_ids.now:
+            if len(id_) == 0:
+                continue
             subtasks += [self.db.tasks[id_]]
         return subtasks
 
+    @property
+    def subtask_depth(self):
+        def count_depth(task):
+            sub_count = 1
+            for subtask in task.subtasks:
+                sub_count += count_depth(subtask)
+            return sub_count
+        return count_depth(self) 
+
     def subtask_loop_checker(self):
         def f(subtask_ids_now):
             loop_msg = "can't set subtask, would create loop"
@@ -159,22 +171,16 @@ class Day:
         self.date = date 
         self.db = db
         self.comment = comment
-        self.archived = True
         self.linked_todos_as_list = []
-        self.todos = {}
 
     @classmethod
     def from_dict(cls, db, d, date=None):
         comment = d['comment'] if 'comment' in d.keys() else ''
         day = cls(db, date, comment)
-        for id_ in d['linked_todos']:
-            day.linked_todos_as_list += [db.todos[id_]]
         return day
 
     def to_dict(self):
-        d = {'comment': self.comment, 'linked_todos': []}
-        for todo_id in self.linked_todos.keys():
-            d['linked_todos'] += [todo_id]
+        d = {'comment': self.comment}
         return d
 
     @property
@@ -188,6 +194,7 @@ class Day:
         s = 0
         for todo in [todo for todo in self.linked_todos.values()
                      if self.date in todo.efforts.keys()]:
+                     # and not todo.children]:
             day_effort = todo.efforts[self.date]
             if todo.done:
                 s += day_effort if day_effort else todo.task.default_effort.at(self.date)
@@ -211,18 +218,18 @@ class Todo:
                  day_tags=None,
                  importance=1.0,
                  efforts=None,
-                 child_ids=None):
+                 dep_ids=None):
         self.id_ = id_
         self.db = db 
         self.task = task 
         self._done = done
-        self._efforts = efforts if efforts else {}
+        self.efforts = efforts if efforts else {}
         self.comment = comment
         self.day_tags = day_tags if day_tags else set()
         self.importance = importance
-        self.child_ids = child_ids if child_ids else [] 
+        self.dep_ids = dep_ids if dep_ids else [] 
 
-        self.parents = [] 
+        self.dependers = [] 
 
     @classmethod
     def from_dict(cls, db, d, id_):
@@ -235,7 +242,7 @@ class Todo:
                 set(d['day_tags']),
                 d['importance'],
                 d['efforts'],
-                d['children'])
+                d['deps'])
         return todo
 
     def to_dict(self):
@@ -246,23 +253,23 @@ class Todo:
                 'day_tags': list(self.day_tags),
                 'importance': self.importance,
                 'efforts': self.efforts,
-                'children': self.child_ids}
-
-    @property
-    def parent(self):
-        return self.parents[0] if len(self.parents) > 0 else None 
+                'deps': self.dep_ids}
 
     @property
     def title(self):
         return self.task.title.at(self.earliest_date)
 
     @property
-    def children(self):
-        return [self.db.todos[id_] for id_ in self.child_ids]
+    def dated_title(self):
+        return f'{self.earliest_date}:{self.title}'
 
-    @children.setter
-    def children(self, children):
-        self.child_ids = [child.id_ for child in children]
+    @property
+    def deps(self):
+        return [self.db.todos[id_] for id_ in self.dep_ids]
+
+    @deps.setter
+    def deps(self, deps):
+        self.dep_ids = [dep.id_ for dep in deps]
 
     @property
     def default_effort(self):
@@ -270,45 +277,45 @@ class Todo:
 
     @property
     def done(self):
-        if len(self.children) > 0:
-            for child in self.children:
-                if not child.done:
-                    return False
-            return True
-        else:
-            return self._done
+        return self.deps_done and self._done
 
     @done.setter
     def done(self, doneness):
         self._done = doneness
 
     @property
-    def efforts(self):
-        if self.children:
-            efforts = {} 
-            for date in self._efforts.keys():
-                efforts[date] = None
-            for child in self.children:
-                to_add = None 
-                for date, effort in child.efforts.items():
-                    if not date in efforts.keys():
-                        efforts[date] = None 
-                    if effort is not None:
-                        to_add = effort
-                    elif child.done:
-                        to_add = child.task.default_effort.at(date)
-                if to_add is not None:
-                    if efforts[date] is not None:
-                        efforts[date] += to_add
-                    else:
-                        efforts[date] = to_add
-            return efforts
+    def deps_done(self):
+        if len(self.deps) > 0:
+            for dep in self.deps:
+                if not dep.done:
+                    return False
+        return True
+
+    @property
+    def dep_efforts(self):
+        dep_efforts = 0
+        if self.deps:
+            for dep in self.deps: 
+                dep_efforts += dep.all_days_effort
+                dep_efforts += dep.dep_efforts
+        return dep_efforts
+
+    def depender_path(self, dep):
+        if self.dependers:
+            return f'Y{depender.depender_path()}:{self.title}Y'
         else:
-            return self._efforts
+            return f'X{self.title}X'
 
-    @efforts.setter
-    def efforts(self, efforts_dict):
-        self._efforts = efforts_dict
+    @property
+    def depender_paths(self):
+        paths = []
+        for depender in self.dependers:
+            if len(depender.depender_paths) == 0:
+                 paths += [[depender]]
+            else:
+                for path in depender.depender_paths:
+                    paths += [path + [depender]] 
+        return paths
 
     @property
     def all_days_effort(self):
@@ -334,13 +341,6 @@ class Todo:
             return False
         return True
 
-    @property
-    def path(self):
-        path = ''
-        if self.parent:
-            path = f'{self.parent.path}{self.parent.title}:'
-        return path
-
     @property
     def tags(self):
         return self.day_tags | self.task.tags.now
@@ -371,16 +371,14 @@ class Todo:
 class TodoDB(PlomDB):
 
     def __init__(self,
-            prefix,
             selected_date=None,
-            t_filter_and = None,
-            t_filter_not = None,
+            tag_filter_and = None,
+            tag_filter_not = None,
             hide_unchosen=False,
             hide_done=False):
-        self.prefix = prefix
         self.selected_date = selected_date if selected_date else today_date()
-        self.t_filter_and = t_filter_and if t_filter_and else []
-        self.t_filter_not = t_filter_not if t_filter_not else []
+        self.tag_filter_and = tag_filter_and if tag_filter_and else []
+        self.tag_filter_not = tag_filter_not if tag_filter_not else []
         self.hide_unchosen = hide_unchosen
         self.hide_done = hide_done
 
@@ -394,25 +392,31 @@ class TodoDB(PlomDB):
 
     def read_db_file(self, f):
         d = json.load(f)
+
         for id_, t_dict in d['tasks'].items():
             t = self.add_task(id_=id_, dict_source=t_dict)
             for tag in t.tags.now:
                 self.t_tags.add(tag)
+        for task in self.tasks.values():
+            for dep in task.subtasks:
+                dep.dependers += [task]
+
         for id_, todo_dict in d['todos'].items():
-            todo = self.add_todo(todo_dict, id_)
-            self.todos[id_] = todo 
+            todo = self.add_todo(todo_dict, id_, link_into_day=False)
             for tag in todo.day_tags:
                 self.t_tags.add(tag)
+        for todo in self.todos.values():
+            for dep in todo.deps:
+                dep.dependers += [todo]
+
         for date, day_dict in d['days'].items():
             self.add_day(dict_source=day_dict, date=date)
         for todo in self.todos.values():
-            for child in todo.children:
-                child.parents += [todo]
             for date in todo.efforts.keys():
                 if not date in self.days.keys():
                     self.add_day(date)
-                if not todo in self.days[date].linked_todos_as_list:
-                    self.days[date].linked_todos_as_list += [todo]
+                self.days[date].linked_todos_as_list += [todo]
+
         self.set_visibilities()
 
     def to_dict(self):
@@ -421,8 +425,6 @@ class TodoDB(PlomDB):
              d['tasks'][uuid] = t.to_dict()
         for date, day in self.days.items():
             d['days'][date] = day.to_dict()
-            for todo in day.todos.values():
-                d['todos'][todo.id_] = todo.to_dict()
         for id_, todo in self.todos.items():
             d['todos'][id_] = todo.to_dict()
         return d
@@ -464,18 +466,33 @@ class TodoDB(PlomDB):
         task.tags.set(tags)
         task.subtask_ids.set(subtask_ids)
         task.comment = comment 
+        return task
 
-    def add_todo(self, todo_dict=None, id_=None, task=None, efforts=None):
+    def add_todo(self, todo_dict=None, id_=None, task=None, efforts=None, link_into_day=True, adopt_if_possible=True):
         id_ = id_ if id_ else str(uuid4())
         if todo_dict:
             todo = Todo.from_dict(self, todo_dict, id_)
         elif task and efforts:
             todo = Todo(self, id_, task, efforts=efforts)
-            children = []
-            for child_task in task.subtasks:
-                children += [self.add_todo(task=child_task, efforts=efforts)]
-            todo.child_ids = [child.id_ for child in children]
+            deps = []
+            for dep_task in task.subtasks:
+                # if Todo expects dependencies, adopt any compatibles found in DB.selected_date
+                # before creating new depended Todos
+                dep_todo = None
+                if adopt_if_possible and list(efforts.keys())[0] == self.selected_date:
+                    adoptable_todos = [t for t in self.selected_day.linked_todos_as_list
+                                       if t.task.id_ == dep_task.id_]
+                    if len(adoptable_todos) > 0:
+                        dep_todo = adoptable_todos[0]
+                if not dep_todo:
+                    dep_todo = self.add_todo(task=dep_task, efforts=efforts,
+                                               link_into_day=link_into_day,
+                                               adopt_if_possible=adopt_if_possible)
+                deps += [dep_todo]
+            todo.dep_ids = [dep.id_ for dep in deps]
         self.todos[id_] = todo 
+        if link_into_day:
+            self.selected_day.linked_todos_as_list += [todo] 
         return todo
 
     def _update_todo_shared(self, id_, done, comment, importance):
@@ -489,13 +506,13 @@ class TodoDB(PlomDB):
         todo = self._update_todo_shared(id_, done, comment, importance)
         todo.efforts[date] = effort 
 
-    def update_todo(self, id_, efforts, done, comment, tags, importance, children):
+    def update_todo(self, id_, efforts, done, comment, tags, importance, deps):
         todo = self._update_todo_shared(id_, done, comment, importance)
-        if len(efforts) == 0 and not todo.children:
+        if len(efforts) == 0 and not todo.deps:
             raise PlomException('todo must have at least one effort!')
-        todo.children = children
+        todo.deps = deps 
         todo.efforts = efforts 
-        for date in todo.efforts:
+        for date in todo.efforts.keys():
             if not date in self.days.keys():
                 self.add_day(date=date) 
             if not self in self.days[date].linked_todos_as_list:
@@ -509,10 +526,13 @@ class TodoDB(PlomDB):
             dates_to_delete += [date]
         for date in dates_to_delete:
             self.delete_effort(todo, date, force=True)
-        for parent in todo.parents:
-            parent.child_ids.remove(todo.id_)
+        for depender in todo.dependers:
+            depender.dep_ids.remove(todo.id_)
         del self.todos[id_]
 
+    def delete_task(self, id_):
+        del self.tasks[id_]
+
     def delete_effort(self, todo, date, force=False):
         if (not force) and len(todo.efforts) == 1:
             raise PlomException('todo must retain at least one effort!')
@@ -521,9 +541,12 @@ class TodoDB(PlomDB):
 
     # views
 
+    def show_message(self, message):
+        return j2env.get_template('message.html').render(message=message)
+
     def show_calendar(self, start_date_str, end_date_str):
-        self.t_filter_and = ['calendar']
-        self.t_filter_not = ['deleted']
+        self.tag_filter_and = ['calendar']
+        self.tag_filter_not = ['deleted']
         self.set_visibilities()
         start_date_obj, end_date_obj = self.get_limit_days_from_date_strings(start_date_str, end_date_str)
         days_to_show = {}
@@ -545,9 +568,16 @@ class TodoDB(PlomDB):
 
     def show_do_todos(self, sort_order=None):
         prev_date_str, next_date_str = self.neighbor_dates()
+        adoptable_past_todos = []
+        for todo in self.todos.values():
+            if todo.done\
+                    or (not todo.visible)\
+                    or todo.earliest_date >= self.selected_date:
+                continue
+            adoptable_past_todos += [todo] 
         todos = [t for t in self.selected_day.linked_todos_as_list
-                 if t.visible
-                 and not t.children]
+                 if t.visible]
+                 # and not t.deps]
         if sort_order == 'title':
             todos.sort(key=lambda t: t.task.title.then)
         elif sort_order == 'done':
@@ -559,16 +589,24 @@ class TodoDB(PlomDB):
         return j2env.get_template('do_todos.html').render(
                 day=self.selected_day,
                 tags=self.t_tags,
-                filter_and=self.t_filter_and,
-                filter_not=self.t_filter_not,
+                filter_and=self.tag_filter_and,
+                filter_not=self.tag_filter_not,
                 prev_date=prev_date_str,
+                adoptable_past_todos=adoptable_past_todos,
                 next_date=next_date_str,
+                all_tasks=[t for t in self.tasks.values()],
                 todos=todos,
                 sort=sort_order,
                 hide_done=self.hide_done)
 
-    def show_todo(self, id_, return_to, search, start_date, end_date):
+    def show_todo(self, id_, start_date, end_date):
         todo = self.todos[id_]
+        filtered_tasks = [t for t in self.tasks.values()
+                          if t != todo.task] 
+        filtered_todos = [t for t in self.todos.values()
+                          if t != todo]
+
+        # if going into the past, only allow 3-day ranges 
         start_day, end_day = self.get_limit_days_from_date_strings(start_date, end_date)
         if start_day < datetime.now() - timedelta(days=2):
             end_day = start_day + timedelta(days=3)
@@ -577,10 +615,6 @@ class TodoDB(PlomDB):
         for n in range(int((end_day - start_day).days) + 1):
             day = start_day + timedelta(n)
             legal_dates += [day.strftime(DATE_FORMAT)]
-        filtered_todos = [t for t in self.todos.values()
-                          if t.visible
-                          and t != todo
-                          and (len(search) == 0 or t.matches(search))] 
         date_filtered_todos = [] 
         for date in legal_dates:
             for filtered_todo in filtered_todos:
@@ -588,104 +622,106 @@ class TodoDB(PlomDB):
                     continue
                 if date in filtered_todo.efforts.keys():
                     date_filtered_todos += [filtered_todo]
+
         return j2env.get_template('todo.html').render(
-                filter_and=self.t_filter_and,
-                filter_not=self.t_filter_not,
                 tags=self.t_tags,
                 todo=todo,
                 filtered_todos=date_filtered_todos,
-                child_todos=todo.children,
-                return_to=return_to,
+                filtered_tasks=filtered_tasks,
+                dep_todos=todo.deps,
                 start_date=start_date,
                 end_date=end_date)
 
-    def show_task(self, id_, return_to='', search=''):
+    def show_task(self, id_):
         task = self.tasks[id_] if id_ else self.add_task()
-        selected = task.id_ in self.selected_day.todos.keys()
+        if not id_:
+            task.default_effort.set(1.0)
         filtered_tasks = [t for t in self.tasks.values()
-                          if t.visible
-                          and t != task
-                          and (t not in task.subtasks)
-                          and (len(search) == 0 or t.matches(search))] 
+                          if t != task
+                          and (t not in task.subtasks)]
         return j2env.get_template('task.html').render(
-                search=search,
+                selected_date=self.selected_date,
                 tags=self.t_tags, 
-                filter_and=self.t_filter_and,
-                filter_not=self.t_filter_not,
                 filtered_tasks=filtered_tasks,
-                task=task,
-                return_to=return_to)
-
-    def show_tasks(self, expand_uuid):
-        expanded_tasks = {}
-        if expand_uuid:
-            for uuid in self.tasks[expand_uuid].subtask_ids.now:
-                expanded_tasks[uuid] = self.tasks[uuid]
-        return j2env.get_template('tasks.html').render(
-                db=self,
-                filter_and=self.t_filter_and,
-                filter_not=self.t_filter_not,
-                expand_uuid=expand_uuid,
-                expanded_tasks=expanded_tasks)
-
-    def show_pick_tasks(self, search, hide_chosen_tasks, sort_order=None):
-        prev_date_str, next_date_str = self.neighbor_dates()
-
-        chosen_todos = self.selected_day.linked_todos_as_list
-
-        relevant_todos = []
-        for todo in self.todos.values():
-            if todo.done\
-                    or (not todo.visible)\
-                    or (not todo.matches(search))\
-                    or todo.earliest_date >= self.selected_date:
-                continue
-            relevant_todos += [todo] 
-
-        tasks = []
-        chosen_tasks = [todo.task for todo in self.selected_day.linked_todos_as_list]
-        for uuid, task in self.tasks.items():
-            if (not task.visible)\
-                    or (not task.matches(search))\
-                    or (hide_chosen_tasks and task in chosen_tasks):
-                continue
-            tasks += [task]
+                task=task)
 
+    def show_tasks(self, search, sort_order=None):
+        filtered_tasks = [] 
+        for task in [t for t in self.tasks.values() if (not search) or t.matches(search)]:
+            filtered_tasks += [task]
         if sort_order == 'title':
-            chosen_todos.sort(key=lambda t: t.title)
-            relevant_todos.sort(key=lambda t: t.title)
-            tasks.sort(key=lambda t: t.title.then)
-        elif sort_order == 'effort':
-            chosen_todos.sort(key=lambda t:
-                              t.day_effort if t.day_effort else (t.default_effort if t.done else 0),
-                              reverse=True)
-            relevant_todos.sort(key=lambda t: t.all_days_effort, reverse=True)
-            tasks.sort(key=lambda t: t.default_effort.then, reverse=True)
-
-        return j2env.get_template('pick_tasks.html').render(
+            filtered_tasks.sort(key=lambda t: t.title.now)
+        elif sort_order == 'default_effort':
+            filtered_tasks.sort(key=lambda t: t.default_effort.now, reverse=True)
+        elif sort_order == 'depth':
+            filtered_tasks.sort(key=lambda t: t.subtask_depth, reverse=True)
+        return j2env.get_template('tasks.html').render(
                 sort=sort_order,
+                tasks=filtered_tasks,
                 tags=self.t_tags,
-                chosen_todos=chosen_todos,
-                filter_and=self.t_filter_and,
-                filter_not=self.t_filter_not,
-                day=self.selected_day,
-                prev_date=prev_date_str,
-                next_date=next_date_str,
-                tasks=tasks,
-                hide_chosen_tasks=hide_chosen_tasks,
-                relevant_todos=relevant_todos,
+                filter_and=self.tag_filter_and,
+                filter_not=self.tag_filter_not,
                 search=search)
 
+    # def show_pick_tasks(self, search, hide_chosen_tasks, sort_order=None):
+    #     prev_date_str, next_date_str = self.neighbor_dates()
+
+    #     chosen_todos = self.selected_day.linked_todos_as_list
+
+    #     relevant_todos = []
+    #     for todo in self.todos.values():
+    #         if todo.done\
+    #                 or (not todo.visible)\
+    #                 or (not todo.matches(search))\
+    #                 or todo.earliest_date >= self.selected_date:
+    #             continue
+    #         relevant_todos += [todo] 
+
+    #     filtered_tasks = []
+    #     chosen_tasks = [todo.task for todo in self.selected_day.linked_todos_as_list]
+    #     for uuid, task in self.tasks.items():
+    #         if (not task.visible)\
+    #                 or (not task.matches(search))\
+    #                 or (hide_chosen_tasks and task in chosen_tasks):
+    #             continue
+    #         filtered_tasks += [task]
+
+    #     if sort_order == 'title':
+    #         chosen_todos.sort(key=lambda t: t.title)
+    #         relevant_todos.sort(key=lambda t: t.dated_title)
+    #         tasks.sort(key=lambda t: t.title.then)
+    #     elif sort_order == 'effort':
+    #         chosen_todos.sort(key=lambda t:
+    #                           t.day_effort if t.day_effort else (t.default_effort if t.done else 0),
+    #                           reverse=True)
+    #         relevant_todos.sort(key=lambda t: t.all_days_effort, reverse=True)
+    #         filtered_tasks.sort(key=lambda t: t.default_effort.then, reverse=True)
+
+    #     return j2env.get_template('pick_tasks.html').render(
+    #             sort=sort_order,
+    #             tags=self.t_tags,
+    #             chosen_todos=chosen_todos,
+    #             filter_and=self.tag_filter_and,
+    #             filter_not=self.tag_filter_not,
+    #             day=self.selected_day,
+    #             prev_date=prev_date_str,
+    #             next_date=next_date_str,
+    #             all_tasks=[t for t in self.tasks.values()],
+    #             filtered_tasks=filtered_tasks,
+    #             hide_chosen_tasks=hide_chosen_tasks,
+    #             relevant_todos=relevant_todos,
+    #             search=search)
+
     # helpers
 
     def set_visibilities(self):
         for uuid, t in self.tasks.items():
-            t.visible = len([tag for tag in self.t_filter_and if not tag in t.tags.now]) == 0\
-                    and len([tag for tag in self.t_filter_not if tag in t.tags.now]) == 0\
+            t.visible = len([tag for tag in self.tag_filter_and if not tag in t.tags.now]) == 0\
+                    and len([tag for tag in self.tag_filter_not if tag in t.tags.now]) == 0\
                     and ((not self.hide_unchosen) or uuid in self.selected_day.todos.keys())
         for todo in self.todos.values():
-            todo.visible = len([tag for tag in self.t_filter_and if not tag in todo.day_tags | todo.task.tags.now ]) == 0\
-                and len([tag for tag in self.t_filter_not if tag in todo.day_tags | todo.task.tags.now ]) == 0\
+            todo.visible = len([tag for tag in self.tag_filter_and if not tag in todo.day_tags | todo.task.tags.now ]) == 0\
+                and len([tag for tag in self.tag_filter_not if tag in todo.day_tags | todo.task.tags.now ]) == 0\
                 and ((not self.hide_done) or (not todo.done))
 
     def get_limit_days_from_date_strings(self, start_date_str, end_date_str):
@@ -726,28 +762,33 @@ class ParamsParser:
             param = param != '0' 
         return param 
 
-    def get_cookied(self, key, default=None):
+    def cookie_key_from_params_key(self, prefix, key):
+        return f'{prefix}:{key}' if prefix else key
+
+    def get_cookied(self, key, default=None, prefix=None):
+        cookie_key = self.cookie_key_from_params_key(prefix, key) 
         param = self.get(key, default)
         if param == '-':
             param = None
-            if key in self.cookie_db.keys():
-                del self.cookie_db[key]
-        if param is None and key in self.cookie_db.keys():
-            param = self.cookie_db[key]
+            if cookie_key in self.cookie_db.keys():
+                del self.cookie_db[cookie_key]
+        if param is None and cookie_key in self.cookie_db.keys():
+            param = self.cookie_db[cookie_key]
         if param is not None:
-            self.cookie_db[key] = param
+            self.cookie_db[cookie_key] = param
         return param
 
-    def get_cookied_chain(self, key, default=None):
+    def get_cookied_chain(self, key, default=None, prefix=None):
+        cookie_key = self.cookie_key_from_params_key(prefix, key) 
         params = self.params.get(key, default)
         if params == ['-']:
             params = None 
-            if key in self.cookie_db.keys():
-                del self.cookie_db[key]
-        if params is None and key in self.cookie_db.keys():
-            params = self.cookie_db[key]
+            if cookie_key in self.cookie_db.keys():
+                del self.cookie_db[cookie_key]
+        if params is None and cookie_key in self.cookie_db.keys():
+            params = self.cookie_db[cookie_key]
         if params is not None:
-            self.cookie_db[key] = params
+            self.cookie_db[cookie_key] = params
         return params
 
 
@@ -759,39 +800,24 @@ class PostvarsParser:
     def has(self, key):
         return key in self.postvars.keys()
 
-    def get(self, key, on_empty=None):
-        return self.get_at_index(key, 0, on_empty)
+    def get(self, key, on_empty=None, float_if_possible=False):
+        return self.get_at_index(key, 0, on_empty, float_if_possible)
 
-    def get_at_index(self, key, i, on_empty=None):
+    def get_at_index(self, key, i, on_empty=None, float_if_possible=False):
         if self.has(key) and len(self.postvars[key][i]) > 0:
-            return self.postvars[key][i] 
-        return on_empty 
-
-    def get_float_if_possible(self, key):
-        s = self.get(key)
-        if s is not None:
-            return float(s)
+            val = self.postvars[key][i] 
         else:
-            return None
+            val = on_empty 
+        if float_if_possible and val is not None:
+            return float(val)
+        else:
+            return val 
 
     def get_all(self, key, on_empty=None):
         if self.has(key) and len(self.postvars[key]) > 0:
-            return self.postvars[key] 
+            return [v for v in self.postvars[key] if len(v) > 0]
         return on_empty
 
-    def get_defined_tags(self, joined_key, key_prefix):
-        tags = set()
-        tags_checked = []
-        for k in self.postvars.keys():
-            if k.startswith(key_prefix):
-                tags_checked += [k[len(key_prefix):]]
-        tags_joined = self.get(joined_key, '')
-        for tag in [tag.strip() for tag in tags_joined.split(';') if tag.strip() != '']:
-            tags.add(tag)
-        for tag in tags_checked:
-            tags.add(tag)
-        return tags
-
     def set(self, key, value):
         self.postvars[key] = [value]
 
@@ -801,7 +827,6 @@ class TodoHandler(PlomHandler):
     def config_init(self):
         return {
             'cookie_name': 'todo_cookie',
-            'prefix': '',
             'cookie_path': '/'
         }
 
@@ -809,7 +834,7 @@ class TodoHandler(PlomHandler):
         default_path = '/todo'
         handler.add_route('GET', default_path, self.show_db)
         handler.add_route('POST', default_path, self.write_db)
-        return 'todo', {'cookie_name': 'todo_cookie', 'prefix': default_path, 'cookie_path': default_path}
+        return 'todo', {'cookie_name': 'todo_cookie', 'cookie_path': default_path}
 
     def do_POST(self):
         self.try_do(self.write_db)
@@ -822,10 +847,10 @@ class TodoHandler(PlomHandler):
         length = int(self.headers['content-length'])
         postvars = PostvarsParser(parse_qs(self.rfile.read(length).decode(), keep_blank_values=1))
 
-        db = TodoDB(prefix=config['prefix'])
+        db = TodoDB()
         redir_params = []
         # if we do encounter a filter post, we repost it (and if empty, the emptying command '-')
-        for param_name, filter_db_name in {('t_and', 't_filter_and'), ('t_not', 't_filter_not')}:
+        for param_name, filter_db_name in {('and_tag', 'tag_filter_and'), ('not_tag', 'tag_filter_not')}:
             filter_db = getattr(db, filter_db_name)
             if postvars.has(param_name): 
                 for target in postvars.get_all(param_name, []):
@@ -837,18 +862,20 @@ class TodoHandler(PlomHandler):
         if site in {'calendar', 'todo'}:
             redir_params += [('end', postvars.get('end', '-'))]
             redir_params += [('start', postvars.get('start', '-'))]
-        if site in {'todo', 'task', 'pick_tasks'}:
-            redir_params += [('search', postvars.get('search', ''))]
-            redir_params += [('search', postvars.get('search', ''))]
-            redir_params += [('search', postvars.get('search', ''))]
+        # if site in {'tasks', 'pick_tasks'}:
+        #     redir_params += [('search', postvars.get('search', ''))]
         if postvars.has('filter'): 
             postvars.set('return_to', '')
         
-        if 'todo' == site:
+        if 'tasks' == site:
+            redir_params += [('search', postvars.get('search', ''))]
+
+        elif 'todo' == site:
             todo_id = postvars.get('todo_id')
             redir_params += [('id', todo_id)]
             old_todo = db.todos[todo_id] if todo_id in db.todos.keys() else None
             efforts = {}
+            latest_date = db.selected_date 
             for i, date in enumerate(postvars.get_all('effort_date', [])):
                 if '' == date:
                     continue
@@ -856,69 +883,88 @@ class TodoHandler(PlomHandler):
                     datetime.strptime(date, DATE_FORMAT)
                 except ValueError:
                     raise PlomException(f'bad date string')
+                latest_date = date
                 efforts[date] = None
-                if not (old_todo and old_todo.children):
-                    efforts[date] = postvars.get_at_index('effort', i, None) 
+                if not (old_todo and old_todo.deps):
+                    efforts[date] = postvars.get_at_index('effort', i, on_empty=None,
+                                                          float_if_possible=True)
             if postvars.has('delete'): 
                 has_day_effort = len([e for e in efforts.values() if e is not None]) > 0
                 if postvars.has('done')\
                         or postvars.get('comment')\
-                        or len(postvars.get_defined_tags('joined_day_tags', 'day_tag_')) > 0\
+                        or postvars.get_all('tag', [])\
                         or has_day_effort:
                     raise PlomException('will not remove todo of preserve-worthy values')
                 db.delete_todo(todo_id) 
-                if not postvars.get('return_to'):
-                    postvars.set('return_to', 'calendar')
+                postvars.set('return_to', 'calendar')
             elif postvars.has('update'):
                 if postvars.has('delete_effort'):
                     for date in postvars.get_all('delete_effort'):
                         db.delete_effort(old_todo, date)
                         del efforts[date]
-                children = [db.todos[id_] for id_ in postvars.get_all('adopt_child', [])] 
+                deps = [db.todos[id_] for id_ in postvars.get_all('adopt_dep', [])
+                        if id_ in db.todos.keys()] 
+                for dep in deps:
+                    if not todo_id in [t.id_ for t in dep.dependers]:
+                        dep.dependers += [db.todos[todo_id]]
+                tasks_to_birth = [db.tasks[id_] for id_ in postvars.get_all('birth_dep', [])]
+                for task in tasks_to_birth:
+                    deps += [db.add_todo(task=task, efforts={latest_date: None})]
                 db.update_todo(id_=todo_id,
                                efforts=efforts,
                                done=postvars.has('done'),
                                comment=postvars.get('comment', ''),
-                               tags=postvars.get_defined_tags('joined_day_tags', 'day_tag_'),
+                               tags=postvars.get_all('tag', []),
                                importance=float(postvars.get('importance')),
-                               children=children)
+                               deps=deps)
 
         elif 'task' == site:
             task_id = postvars.get('task_id')
-            if postvars.has('update'):
-                db.update_task(
+            if postvars.has('delete') and task_id in db.tasks.keys():
+                if [t for t in db.todos.values() if task_id == t.task.id_]:
+                    raise PlomException('will not remove Task describing existing Todos')
+                if postvars.get('title', '')\
+                        or postvars.get_all('tag', [])\
+                        or postvars.get_all('subtask', [])\
+                        or postvars.get('comment', ''):
+                    raise PlomException('will not remove Task of preserve-worthy values')
+                db.delete_task(task_id)
+            elif postvars.has('update'):
+                task = db.update_task(
                         id_=task_id,
                         title=postvars.get('title', ''),
-                        default_effort=postvars.get_float_if_possible('default_effort'), 
-                        tags=postvars.get_defined_tags('joined_tags', 'tag_'),
+                        default_effort=postvars.get('default_effort', float_if_possible=True), 
+                        tags=postvars.get_all('tag', []),
                         subtask_ids=postvars.get_all('subtask', []),
                         comment=postvars.get('comment', ''))
+                if postvars.has('add_as_todo'):
+                    db.add_todo(task=task, efforts={postvars.get('selected_date'): None})
             redir_params += [('id', task_id)]
 
-        elif 'pick_tasks' == site:
-            redir_params += [('hide_chosen_tasks', int(postvars.has('hide_chosen_tasks')))]
-            if postvars.has('update'):
-                db.selected_date = postvars.get('date')
-                todos_to_shrink = []
-                todos_to_delete = []
-                for todo in db.selected_day.linked_todos_as_list:
-                    if todo.visible and not todo.id_ in postvars.get_all('chosen_todo', []):
-                        if len(todo.comment) > 0\
-                                or len(todo.day_tags) > 0\
-                                or not todo.is_effort_removable(db.selected_date):
-                            raise PlomException('will not remove effort of preserve-worthy values')
-                        if len(todo.efforts) > 1:
-                            todos_to_shrink += [todo]
-                        else:
-                            todos_to_delete += [todo]
-                for todo in todos_to_shrink:
-                    db.delete_effort(todo, db.selected_date)
-                for todo in todos_to_delete:
-                    db.delete_todo(todo.id_)
-                for id_ in postvars.get_all('choose_task', []):
-                    db.add_todo(task=db.tasks[id_], efforts={db.selected_date: None})
-                for id_ in postvars.get_all('choose_todo', []):
-                    db.todos[id_].efforts[db.selected_date] = None
+        elif 'pick_tasks' == site:
+            redir_params += [('hide_chosen_tasks', int(postvars.has('hide_chosen_tasks')))]
+            if postvars.has('update'):
+                db.selected_date = postvars.get('date')
+                todos_to_shrink = []
+                todos_to_delete = []
+                for todo in db.selected_day.linked_todos_as_list:
+                    if todo.visible and not todo.id_ in postvars.get_all('chosen_todo', []):
+                        if len(todo.comment) > 0\
+                                or len(todo.day_tags) > 0\
+                                or not todo.is_effort_removable(db.selected_date):
+                            raise PlomException('will not remove effort of preserve-worthy values')
+                        if len(todo.efforts) > 1:
+                            todos_to_shrink += [todo]
+                        else:
+                            todos_to_delete += [todo]
+                for todo in todos_to_shrink:
+                    db.delete_effort(todo, db.selected_date)
+                for todo in todos_to_delete:
+                    db.delete_todo(todo.id_)
+                for id_ in postvars.get_all('choose_task', []):
+                    db.add_todo(task=db.tasks[id_], efforts={db.selected_date: None})
+                for id_ in postvars.get_all('choose_todo', []):
+                    db.todos[id_].efforts[db.selected_date] = None
 
         elif 'do_todos' == site:
             redir_params += [('hide_done', int(postvars.has('hide_done')))]
@@ -926,12 +972,26 @@ class TodoHandler(PlomHandler):
                 db.selected_date = postvars.get('date') 
                 redir_params += [('date', db.selected_date)]
                 db.selected_day.comment = postvars.get('day_comment', '') 
-                for i, todo_id in enumerate(postvars.get_all('todo_id')):
-                    old_todo = None if not todo_id in db.todos.keys() else db.todos[todo_id]
+                task_id = postvars.get('choose_task', None)
+                if task_id:
+                    if task_id not in db.tasks.keys():
+                        raise PlomException('illegal task ID entered')
+                    db.add_todo(task=db.tasks[task_id], efforts={db.selected_date: None},
+                                adopt_if_possible=(not postvars.has('dont_adopt')))
+                for id_ in postvars.get_all('choose_todo', []):
+                    db.todos[id_].efforts[db.selected_date] = None
+                for i, todo_id in enumerate(postvars.get_all('todo_id', [])):
+                    old_todo = db.todos[todo_id]
                     done = todo_id in postvars.get_all('done', [])
                     day_effort_input = postvars.get_at_index('effort', i, '') 
                     day_effort = float(day_effort_input) if len(day_effort_input) > 0 else None
                     comment = postvars.get_at_index('effort_comment', i, '') 
+                    if (day_effort is not None) and (not done) and day_effort < 0 and 0 == len(comment):
+                        if len(old_todo.efforts) > 1:
+                            db.delete_effort(old_todo, db.selected_date) 
+                        else:
+                            db.delete_todo(todo_id)
+                        continue
                     importance = float(postvars.get_at_index('importance', i))
                     if old_todo\
                             and old_todo.done == done\
@@ -964,50 +1024,51 @@ class TodoHandler(PlomHandler):
         cookie_db = self.get_cookie_db(config['cookie_name'])
         params = ParamsParser(parsed_url.query, cookie_db)
 
-        selected_date = t_filter_and = t_filter_not = None
+        selected_date = tag_filter_and = tag_filter_not = None
         hide_unchosen = hide_done = False
         return_to = params.get('return_to', '')
-        if site in {'do_todos', 'pick_tasks', 'calendar'}:
+        if site in {'do_todos', 'calendar', 'task'}:
             selected_date = params.get_cookied('date')
-        if site in {'do_todos', 'pick_tasks', 'task', 'todo'}:
-            t_filter_and = params.get_cookied_chain('t_and')
-            t_filter_not = params.get_cookied_chain('t_not')
+        if site in {'do_todos', 'tasks'}:
+            tag_filter_and = params.get_cookied_chain('and_tag', prefix=site)
+            tag_filter_not = params.get_cookied_chain('not_tag', prefix=site)
         if 'do_todos' == site:
             hide_done = params.get('hide_done', False) 
-        db = TodoDB(config['prefix'], selected_date, t_filter_and, t_filter_not, hide_unchosen, hide_done)
+        db = TodoDB(selected_date, tag_filter_and, tag_filter_not, hide_unchosen, hide_done)
         if site in {'todo', 'task'}:
             id_ = params.get('id')
-        if site in {'todo', 'task', 'pick_tasks'}:
-            search = params.get('search', '')
-        if site in {'do_todos', 'pick_tasks'}:
-            sort_order = params.get_cookied('sort')
-        if site in {'calendar', 'todo'}:
-            start_date = params.get_cookied('start')
-            end_date = params.get_cookied('end')
-        if 'do_todos' == site:
+        if site in {'do_todos', 'tasks'}:
+            sort_order = params.get_cookied('sort', prefix=site)
+        if site in {'', 'calendar', 'todo'}:
+            start_date = params.get_cookied('start', prefix=site)
+            end_date = params.get_cookied('end', prefix=site)
+        if 'reset_cookie' == site:
+            cookie_db = {  # sensible defaults
+                # params.cookie_key_from_params_key('pick_tasks', 'and_tag'): ['default'],
+                # params.cookie_key_from_params_key('pick_tasks', 'not_tag'): ['ignore'],
+                params.cookie_key_from_params_key('todo', 'and_tag'): ['default'],
+                params.cookie_key_from_params_key('todo', 'not_tag'): ['ignore'],
+                params.cookie_key_from_params_key('todo', 'start'): 'yesterday',
+                params.cookie_key_from_params_key('todo', 'end'): 'today'}
+            page = db.show_message('cookie unset!')
+        elif 'do_todos' == site:
             page = db.show_do_todos(sort_order)
-        elif 'pick_tasks' == site:
-            hide_chosen_tasks = params.get('hide_chosen_tasks', False)
-            page = db.show_pick_tasks(search, hide_chosen_tasks, sort_order)
+        elif 'pick_tasks' == site:
+            hide_chosen_tasks = params.get('hide_chosen_tasks', False)
+            page = db.show_pick_tasks(search, hide_chosen_tasks, sort_order)
         elif site == 'todo':
-            page = db.show_todo(id_, return_to, search, start_date, end_date)
+            page = db.show_todo(id_, start_date, end_date)
         elif 'task' == site:
-            page = db.show_task(id_, return_to, search)
+            page = db.show_task(id_)
         elif 'tasks' == site:
-            expand_uuid = params.get('expand_uuid')
-            page = db.show_tasks(expand_uuid)
+            search = params.get('search', '')
+            page = db.show_tasks(search, sort_order)
         elif 'add_task' == site:
             page = db.show_task(None)
-        elif 'unset_cookie' == site:
-            page = 'no cookie to unset.'
-            if len(cookie_db) > 0:
-                self.unset_cookie(config['cookie_name'], config['cookie_path'])
-                page = 'cookie unset!'
-        else:
+        else:  # 'calendar' == site
             page = db.show_calendar(start_date, end_date)
 
-        if 'unset_cookie' != site:
-            self.set_cookie(config['cookie_name'], config['cookie_path'], cookie_db)
+        self.set_cookie(config['cookie_name'], config['cookie_path'], cookie_db)
         self.send_HTML(page)