Task: Add NotSaved exception

[etc/taskwarrior.git] / tasklib / task.py

diff --git a/tasklib/task.py b/tasklib/task.py
index 9246e1f67a2895465289da15c852ec6d4ec7fe62..09535881550207dff67ed436f1a438f15b7a5949 100644 (file)
--- a/tasklib/task.py
+++ b/tasklib/task.py
@@ -1,8 +1,10 @@
+from __future__ import print_function

 import copy
 import datetime
 import json
 import logging
 import os
 import copy
 import datetime
 import json
 import logging
 import os

+import six

 import subprocess
 
 DATE_FORMAT = '%Y%m%dT%H%M%SZ'
 import subprocess
 
 DATE_FORMAT = '%Y%m%dT%H%M%SZ'


@@ -17,18 +19,11 @@ class TaskWarriorException(Exception):
     pass
 
 
     pass
 
 

-class Task(object):
+class TaskResource(object):
+    read_only_fields = []

 
 

-    class DoesNotExist(Exception):
-        pass
-
-    def __init__(self, warrior, data={}):
-        self.warrior = warrior
+    def _load_data(self, data):

         self._data = data
         self._data = data

-        self._modified_fields = set()
-
-    def __unicode__(self):
-        return self['description']

 
     def __getitem__(self, key):
         hydrate_func = getattr(self, 'deserialize_{0}'.format(key),
 
     def __getitem__(self, key):
         hydrate_func = getattr(self, 'deserialize_{0}'.format(key),


@@ -36,11 +31,98 @@ class Task(object):
         return hydrate_func(self._data.get(key))
 
     def __setitem__(self, key, value):
         return hydrate_func(self._data.get(key))
 
     def __setitem__(self, key, value):

+        if key in self.read_only_fields:
+            raise RuntimeError('Field \'%s\' is read-only' % key)

         dehydrate_func = getattr(self, 'serialize_{0}'.format(key),
                                  lambda x: x)
         self._data[key] = dehydrate_func(value)
         self._modified_fields.add(key)
 
         dehydrate_func = getattr(self, 'serialize_{0}'.format(key),
                                  lambda x: x)
         self._data[key] = dehydrate_func(value)
         self._modified_fields.add(key)
 

+    def __str__(self):
+        s = six.text_type(self.__unicode__())
+        if not six.PY3:
+            s = s.encode('utf-8')
+        return s
+
+    def __repr__(self):
+        return str(self)
+
+
+class TaskAnnotation(TaskResource):
+    read_only_fields = ['entry', 'description']
+
+    def __init__(self, task, data={}):
+        self.task = task
+        self._load_data(data)
+
+    def deserialize_entry(self, data):
+        return datetime.datetime.strptime(data, DATE_FORMAT) if data else None
+
+    def serialize_entry(self, date):
+        return date.strftime(DATE_FORMAT) if date else ''
+
+    def remove(self):
+        self.task.remove_annotation(self)
+
+    def __unicode__(self):
+        return self['description']
+
+    __repr__ = __unicode__
+
+
+class Task(TaskResource):
+    read_only_fields = ['id', 'entry', 'urgency', 'uuid']
+
+    class DoesNotExist(Exception):
+        pass
+
+    class CompletedTask(Exception):
+        """
+        Raised when the operation cannot be performed on the completed task.
+        """
+        pass
+
+    class DeletedTask(Exception):
+        """
+        Raised when the operation cannot be performed on the deleted task.
+        """
+        pass
+
+    class NotSaved(Exception):
+        """
+        Raised when the operation cannot be performed on the task, because
+        it has not been saved to TaskWarrior yet.
+        """
+        pass
+
+    def __init__(self, warrior, data={}):
+        self.warrior = warrior
+        self._load_data(data)
+        self._modified_fields = set()
+
+    def __unicode__(self):
+        return self['description']
+
+    @property
+    def completed(self):
+        return self['status'] == six.text_type('completed')
+
+    @property
+    def deleted(self):
+        return self['status'] == six.text_type('deleted')
+
+    @property
+    def waiting(self):
+        return self['status'] == six.text_type('waiting')
+
+    @property
+    def pending(self):
+        return self['status'] == six.text_type('pending')
+
+    @property
+    def saved(self):
+        return self['uuid'] is not None or self['id'] is not None
+

     def serialize_due(self, date):
         return date.strftime(DATE_FORMAT)
 
     def serialize_due(self, date):
         return date.strftime(DATE_FORMAT)
 


@@ -49,18 +131,8 @@ class Task(object):
             return None
         return datetime.datetime.strptime(date_str, DATE_FORMAT)
 
             return None
         return datetime.datetime.strptime(date_str, DATE_FORMAT)
 

-    def serialize_annotations(self, annotations):
-        ann_list = list(annotations)
-        for ann in ann_list:
-            ann['entry'] = ann['entry'].strftime(DATE_FORMAT)
-        return ann_list
-
-    def deserialize_annotations(self, annotations):
-        ann_list = list(annotations)
-        for ann in ann_list:
-            ann['entry'] = datetime.datetime.strptime(
-                ann['entry'], DATE_FORMAT)
-        return ann_list
+    def deserialize_annotations(self, data):
+        return [TaskAnnotation(self, d) for d in data] if data else []

 
     def deserialize_tags(self, tags):
         if isinstance(tags, basestring):
 
     def deserialize_tags(self, tags):
         if isinstance(tags, basestring):


@@ -71,26 +143,111 @@ class Task(object):
         return ','.join(tags) if tags else ''
 
     def delete(self):
         return ','.join(tags) if tags else ''
 
     def delete(self):

-        self.warrior.execute_command([self['id'], 'delete'], config_override={
+        if not self.saved:
+            raise self.NotSaved("Task needs to be saved before it can be deleted")
+
+        # Refresh the status, and raise exception if the task is deleted
+        self.refresh(only_fields=['status'])
+
+        if self.deleted:
+            raise self.DeletedTask("Task was already deleted")
+
+        self.warrior.execute_command([self['uuid'], 'delete'], config_override={

             'confirmation': 'no',
         })
 
             'confirmation': 'no',
         })
 

+        # Refresh the status again, so that we have updated info stored
+        self.refresh(only_fields=['status'])
+
+

     def done(self):
     def done(self):

-        self.warrior.execute_command([self['id'], 'done'])
+        if not self.saved:
+            raise self.NotSaved("Task needs to be saved before it can be completed")
+
+        # Refresh, and raise exception if task is already completed/deleted
+        self.refresh(only_fields=['status'])
+
+        if self.completed:
+            raise self.CompletedTask("Cannot complete a completed task")
+        elif self.deleted:
+            raise self.DeletedTask("Deleted task cannot be completed")
+
+        self.warrior.execute_command([self['uuid'], 'done'])
+
+        # Refresh the status again, so that we have updated info stored
+        self.refresh(only_fields=['status'])

 
     def save(self):
 
     def save(self):

-        args = [self['id'], 'modify'] if self['id'] else ['add']
+        args = [self['uuid'], 'modify'] if self.saved else ['add']

         args.extend(self._get_modified_fields_as_args())
         args.extend(self._get_modified_fields_as_args())

-        self.warrior.execute_command(args)
+        output = self.warrior.execute_command(args)
+
+        # Parse out the new ID, if the task is being added for the first time
+        if not self.saved:
+            id_lines = [l for l in output if l.startswith('Created task ')]
+
+            # Complain loudly if it seems that more tasks were created
+            # Should not happen
+            if len(id_lines) != 1 or len(id_lines[0].split(' ')) != 3:
+                raise TaskWarriorException("Unexpected output when creating "
+                                           "task: %s" % '\n'.join(id_lines))
+
+            # Circumvent the ID storage, since ID is considered read-only
+            self._data['id'] = int(id_lines[0].split(' ')[2].rstrip('.'))
+

         self._modified_fields.clear()
         self._modified_fields.clear()

+        self.refresh()
+
+    def add_annotation(self, annotation):
+        if not self.saved:
+            raise self.NotSaved("Task needs to be saved to add annotation")
+
+        args = [self['uuid'], 'annotate', annotation]
+        self.warrior.execute_command(args)
+        self.refresh(only_fields=['annotations'])
+
+    def remove_annotation(self, annotation):
+        if not self.saved:
+            raise self.NotSaved("Task needs to be saved to add annotation")
+
+        if isinstance(annotation, TaskAnnotation):
+            annotation = annotation['description']
+        args = [self['uuid'], 'denotate', annotation]
+        self.warrior.execute_command(args)
+        self.refresh(only_fields=['annotations'])

 
     def _get_modified_fields_as_args(self):
         args = []
 
     def _get_modified_fields_as_args(self):
         args = []

-        for field in self._modified_fields:
-            args.append('{}:{}'.format(field, self._data[field]))
+
+        # If we're modifying saved task, simply pass on all modified fields
+        if self.saved:
+            for field in self._modified_fields:
+                args.append('{0}:{1}'.format(field, self._data[field]))
+        # For new tasks, pass all fields that make sense
+        else:
+            for field in self._data.keys():
+                if field in self.read_only_fields:
+                    continue
+                args.append('{0}:{1}'.format(field, self._data[field]))
+

         return args
 
         return args
 

-    __repr__ = __unicode__
+    def refresh(self, only_fields=[]):
+        # Raise error when trying to refresh a task that has not been saved
+        if not self.saved:
+            raise self.NotSaved("Task needs to be saved to be refreshed")
+
+        # We need to use ID as backup for uuid here for the refreshes
+        # of newly saved tasks. Any other place in the code is fine
+        # with using UUID only.
+        args = [self['uuid'] or self['id'], 'export']
+        new_data = json.loads(self.warrior.execute_command(args)[0])
+        if only_fields:
+            to_update = dict(
+                [(k, new_data.get(k)) for k in only_fields])
+            self._data.update(to_update)
+        else:
+            self._data = new_data

 
 
 class TaskFilter(object):
 
 
 class TaskFilter(object):


@@ -106,6 +263,10 @@ class TaskFilter(object):
 
     def add_filter_param(self, key, value):
         key = key.replace('__', '.')
 
     def add_filter_param(self, key, value):
         key = key.replace('__', '.')

+
+        # Replace the value with empty string, since that is the
+        # convention in TW for empty values
+        value = value if value is not None else ''

         self.filter_params.append('{0}:{1}'.format(key, value))
 
     def get_filter_params(self):
         self.filter_params.append('{0}:{1}'.format(key, value))
 
     def get_filter_params(self):


@@ -252,7 +413,7 @@ class TaskWarrior(object):
         logger.debug(' '.join(command_args))
         p = subprocess.Popen(command_args, stdout=subprocess.PIPE,
                              stderr=subprocess.PIPE)
         logger.debug(' '.join(command_args))
         p = subprocess.Popen(command_args, stdout=subprocess.PIPE,
                              stderr=subprocess.PIPE)

-        stdout, stderr = [x.decode() for x in p.communicate()]
+        stdout, stderr = [x.decode('utf-8') for x in p.communicate()]

         if p.returncode:
             if stderr.strip():
                 error_msg = stderr.strip().splitlines()[-1]
         if p.returncode:
             if stderr.strip():
                 error_msg = stderr.strip().splitlines()[-1]