lazy: Properly override getattr calls

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

diff --git a/tasklib/backends.py b/tasklib/backends.py
index e5562c6834c6f96f101c81a28e3b244023f202d3..b15e8bd97afac69339d6cdeb64bce43d953616bc 100644 (file)
--- a/tasklib/backends.py
+++ b/tasklib/backends.py
@@ -1,22 +1,29 @@
 import abc
 import abc

+import copy
+import datetime
+import json
+import logging

 import os
 import re
 import os
 import re

+import six

 import subprocess
 
 import subprocess
 

+from .task import Task, TaskQuerySet, ReadOnlyDictView
+from .filters import TaskWarriorFilter
+from .serializing import local_zone

 
 

-VERSION_2_1_0 = six.u('2.1.0')
-VERSION_2_2_0 = six.u('2.2.0')
-VERSION_2_3_0 = six.u('2.3.0')
-VERSION_2_4_0 = six.u('2.4.0')
-VERSION_2_4_1 = six.u('2.4.1')
-VERSION_2_4_2 = six.u('2.4.2')
-VERSION_2_4_3 = six.u('2.4.3')
-VERSION_2_4_4 = six.u('2.4.4')
-VERSION_2_4_5 = six.u('2.4.5')
+DATE_FORMAT_CALC = '%Y-%m-%dT%H:%M:%S'
+
+logger = logging.getLogger(__name__)

 
 
 class Backend(object):
 
 
 
 class Backend(object):
 

+    @abc.abstractproperty
+    def filter_class(self):
+        """Returns the TaskFilter class used by this backend"""
+        pass
+

     @abc.abstractmethod
     def filter_tasks(self, filter_obj):
         """Returns a list of Task objects matching the given filter"""
     @abc.abstractmethod
     def filter_tasks(self, filter_obj):
         """Returns a list of Task objects matching the given filter"""


@@ -38,13 +45,55 @@ class Backend(object):
     def stop_task(self, task):
         pass
 
     def stop_task(self, task):
         pass
 

+    @abc.abstractmethod
+    def complete_task(self, task):
+        pass
+
+    @abc.abstractmethod
+    def refresh_task(self, task, after_save=False):
+        """
+        Refreshes the given task. Returns new data dict with serialized
+        attributes.
+        """
+        pass
+
+    @abc.abstractmethod
+    def annotate_task(self, task, annotation):
+        pass
+
+    @abc.abstractmethod
+    def denotate_task(self, task, annotation):
+        pass
+

     @abc.abstractmethod
     def sync(self):
         """Syncs the backend database with the taskd server"""
         pass
 
     @abc.abstractmethod
     def sync(self):
         """Syncs the backend database with the taskd server"""
         pass
 

+    def convert_datetime_string(self, value):
+        """
+        Converts TW syntax datetime string to a localized datetime
+        object. This method is not mandatory.
+        """
+        raise NotImplemented
+
+
+class TaskWarriorException(Exception):
+    pass
+
+
+class TaskWarrior(Backend):
+
+    VERSION_2_1_0 = six.u('2.1.0')
+    VERSION_2_2_0 = six.u('2.2.0')
+    VERSION_2_3_0 = six.u('2.3.0')
+    VERSION_2_4_0 = six.u('2.4.0')
+    VERSION_2_4_1 = six.u('2.4.1')
+    VERSION_2_4_2 = six.u('2.4.2')
+    VERSION_2_4_3 = six.u('2.4.3')
+    VERSION_2_4_4 = six.u('2.4.4')
+    VERSION_2_4_5 = six.u('2.4.5')

 
 

-class TaskWarrior(object):

     def __init__(self, data_location=None, create=True, taskrc_location='~/.taskrc'):
         self.taskrc_location = os.path.expanduser(taskrc_location)
 
     def __init__(self, data_location=None, create=True, taskrc_location='~/.taskrc'):
         self.taskrc_location = os.path.expanduser(taskrc_location)
 


@@ -53,8 +102,9 @@ class TaskWarrior(object):
         if not os.path.exists(self.taskrc_location):
             self.taskrc_location = '/'
 
         if not os.path.exists(self.taskrc_location):
             self.taskrc_location = '/'
 

+        self._config = None

         self.version = self._get_version()
         self.version = self._get_version()

-        self.config = {
+        self.overrides = {

             'confirmation': 'no',
             'dependency.confirmation': 'no',  # See TW-1483 or taskrc man page
             'recurrence.confirmation': 'no',  # Necessary for modifying R tasks
             'confirmation': 'no',
             'dependency.confirmation': 'no',  # See TW-1483 or taskrc man page
             'recurrence.confirmation': 'no',  # Necessary for modifying R tasks


@@ -64,7 +114,7 @@ class TaskWarrior(object):
 
             # 2.4.3 onwards supports 0 as infite bulk, otherwise set just
             # arbitrary big number which is likely to be large enough
 
             # 2.4.3 onwards supports 0 as infite bulk, otherwise set just
             # arbitrary big number which is likely to be large enough

-            'bulk': 0 if self.version >= VERSION_2_4_3 else 100000,
+            'bulk': 0 if self.version >= self.VERSION_2_4_3 else 100000,

         }
 
         # Set data.location override if passed via kwarg
         }
 
         # Set data.location override if passed via kwarg


@@ -72,32 +122,124 @@ class TaskWarrior(object):
             data_location = os.path.expanduser(data_location)
             if create and not os.path.exists(data_location):
                 os.makedirs(data_location)
             data_location = os.path.expanduser(data_location)
             if create and not os.path.exists(data_location):
                 os.makedirs(data_location)

-            self.config['data.location'] = data_location
+            self.overrides['data.location'] = data_location

 
         self.tasks = TaskQuerySet(self)
 
     def _get_command_args(self, args, config_override=None):
         command_args = ['task', 'rc:{0}'.format(self.taskrc_location)]
 
         self.tasks = TaskQuerySet(self)
 
     def _get_command_args(self, args, config_override=None):
         command_args = ['task', 'rc:{0}'.format(self.taskrc_location)]

-        config = self.config.copy()
-        config.update(config_override or dict())
-        for item in config.items():
+        overrides = self.overrides.copy()
+        overrides.update(config_override or dict())
+        for item in overrides.items():

             command_args.append('rc.{0}={1}'.format(*item))
         command_args.extend(map(six.text_type, args))
         return command_args
 
     def _get_version(self):
         p = subprocess.Popen(
             command_args.append('rc.{0}={1}'.format(*item))
         command_args.extend(map(six.text_type, args))
         return command_args
 
     def _get_version(self):
         p = subprocess.Popen(

-                ['task', '--version'],
-                stdout=subprocess.PIPE,
-                stderr=subprocess.PIPE)
+            ['task', '--version'],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE)

         stdout, stderr = [x.decode('utf-8') for x in p.communicate()]
         return stdout.strip('\n')
 
         stdout, stderr = [x.decode('utf-8') for x in p.communicate()]
         return stdout.strip('\n')
 

-    def get_config(self):
+    def _get_modified_task_fields_as_args(self, task):
+        args = []
+
+        def add_field(field):
+            # Add the output of format_field method to args list (defaults to
+            # field:value)
+            serialized_value = task._serialize(field, task._data[field])
+
+            # Empty values should not be enclosed in quotation marks, see
+            # TW-1510
+            if serialized_value is '':
+                escaped_serialized_value = ''
+            else:
+                escaped_serialized_value = six.u("'{0}'").format(
+                    serialized_value)
+
+            format_default = lambda task: six.u("{0}:{1}").format(
+                field, escaped_serialized_value)
+
+            format_func = getattr(self, 'format_{0}'.format(field),
+                                  format_default)
+
+            args.append(format_func(task))
+
+        # If we're modifying saved task, simply pass on all modified fields
+        if task.saved:
+            for field in task._modified_fields:
+                add_field(field)
+        # For new tasks, pass all fields that make sense
+        else:
+            for field in task._data.keys():
+                if field in task.read_only_fields:
+                    continue
+                add_field(field)
+
+        return args
+
+    def format_depends(self, task):
+        # We need to generate added and removed dependencies list,
+        # since Taskwarrior does not accept redefining dependencies.
+
+        # This cannot be part of serialize_depends, since we need
+        # to keep a list of all depedencies in the _data dictionary,
+        # not just currently added/removed ones
+
+        old_dependencies = task._original_data.get('depends', set())
+
+        added = task['depends'] - old_dependencies
+        removed = old_dependencies - task['depends']
+
+        # Removed dependencies need to be prefixed with '-'
+        return 'depends:' + ','.join(
+            [t['uuid'] for t in added] +
+            ['-' + t['uuid'] for t in removed]
+        )
+
+    def format_description(self, task):
+        # Task version older than 2.4.0 ignores first word of the
+        # task description if description: prefix is used
+        if self.version < self.VERSION_2_4_0:
+            return task._data['description']
+        else:
+            return six.u("description:'{0}'").format(task._data['description'] or '')
+
+    def convert_datetime_string(self, value):
+
+        if self.version >= self.VERSION_2_4_0:
+            # For strings, use 'task calc' to evaluate the string to datetime
+            # available since TW 2.4.0
+            args = value.split()
+            result = self.execute_command(['calc'] + args)
+            naive = datetime.datetime.strptime(result[0], DATE_FORMAT_CALC)
+            localized = local_zone.localize(naive)
+        else:
+            raise ValueError("Provided value could not be converted to "
+                             "datetime, its type is not supported: {}"
+                             .format(type(value)))
+
+        return localized
+
+    @property
+    def filter_class(self):
+        return TaskWarriorFilter
+
+    # Public interface
+
+    @property
+    def config(self):
+        # First, check if memoized information is available
+        if self._config:
+            return self._config
+
+        # If not, fetch the config using the 'show' command

         raw_output = self.execute_command(
         raw_output = self.execute_command(

-                ['show'],
-                config_override={'verbose': 'nothing'}
-            )
+            ['show'],
+            config_override={'verbose': 'nothing'}
+        )

 
         config = dict()
         config_regex = re.compile(r'^(?P<key>[^\s]+)\s+(?P<value>[^\s].+$)')
 
         config = dict()
         config_regex = re.compile(r'^(?P<key>[^\s]+)\s+(?P<value>[^\s].+$)')


@@ -107,7 +249,10 @@ class TaskWarrior(object):
             if match:
                 config[match.group('key')] = match.group('value').strip()
 
             if match:
                 config[match.group('key')] = match.group('value').strip()
 

-        return config
+        # Memoize the config dict
+        self._config = ReadOnlyDictView(config)
+
+        return self._config

 
     def execute_command(self, args, config_override=None, allow_failure=True,
                         return_all=False):
 
     def execute_command(self, args, config_override=None, allow_failure=True,
                         return_all=False):


@@ -137,12 +282,23 @@ class TaskWarrior(object):
         # of recurrent tasks.
 
         # Only necessary for TW up to 2.4.1, fixed in 2.4.2.
         # of recurrent tasks.
 
         # Only necessary for TW up to 2.4.1, fixed in 2.4.2.

-        if self.version < VERSION_2_4_2:
+        if self.version < self.VERSION_2_4_2:

             self.execute_command(['next'], allow_failure=False)
 
             self.execute_command(['next'], allow_failure=False)
 

+    def merge_with(self, path, push=False):
+        path = path.rstrip('/') + '/'
+        self.execute_command(['merge', path], config_override={
+            'merge.autopush': 'yes' if push else 'no',
+        })
+
+    def undo(self):
+        self.execute_command(['undo'])
+
+    # Backend interface implementation
+

     def filter_tasks(self, filter_obj):
         self.enforce_recurrence()
     def filter_tasks(self, filter_obj):
         self.enforce_recurrence()

-        args = ['export', '--'] + filter_obj.get_filter_params()
+        args = ['export'] + filter_obj.get_filter_params()

         tasks = []
         for line in self.execute_command(args):
             if line:
         tasks = []
         for line in self.execute_command(args):
             if line:


@@ -155,11 +311,99 @@ class TaskWarrior(object):
                     raise TaskWarriorException('Invalid JSON: %s' % data)
         return tasks
 
                     raise TaskWarriorException('Invalid JSON: %s' % data)
         return tasks
 

-    def merge_with(self, path, push=False):
-        path = path.rstrip('/') + '/'
-        self.execute_command(['merge', path], config_override={
-            'merge.autopush': 'yes' if push else 'no',
-        })
+    def save_task(self, task):
+        """Save a task into TaskWarrior database using add/modify call"""

 
 

-    def undo(self):
-        self.execute_command(['undo'])
+        args = [task['uuid'], 'modify'] if task.saved else ['add']
+        args.extend(self._get_modified_task_fields_as_args(task))
+        output = self.execute_command(args)
+
+        # Parse out the new ID, if the task is being added for the first time
+        if not task.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
+            identifier = id_lines[0].split(' ')[2].rstrip('.')
+
+            # Identifier can be either ID or UUID for completed tasks
+            try:
+                task._data['id'] = int(identifier)
+            except ValueError:
+                task._data['uuid'] = identifier
+
+        # Refreshing is very important here, as not only modification time
+        # is updated, but arbitrary attribute may have changed due hooks
+        # altering the data before saving
+        task.refresh(after_save=True)
+
+    def delete_task(self, task):
+        self.execute_command([task['uuid'], 'delete'])
+
+    def start_task(self, task):
+        self.execute_command([task['uuid'], 'start'])
+
+    def stop_task(self, task):
+        self.execute_command([task['uuid'], 'stop'])
+
+    def complete_task(self, task):
+        # Older versions of TW do not stop active task at completion
+        if self.version < self.VERSION_2_4_0 and task.active:
+            task.stop()
+
+        self.execute_command([task['uuid'], 'done'])
+
+    def annotate_task(self, task, annotation):
+        args = [task['uuid'], 'annotate', annotation]
+        self.execute_command(args)
+
+    def denotate_task(self, task, annotation):
+        args = [task['uuid'], 'denotate', annotation]
+        self.execute_command(args)
+
+    def refresh_task(self, task, after_save=False):
+        # 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 = [task['uuid'] or task['id'], 'export']
+        output = self.execute_command(args)
+
+        def valid(output):
+            return len(output) == 1 and output[0].startswith('{')
+
+        # For older TW versions attempt to uniquely locate the task
+        # using the data we have if it has been just saved.
+        # This can happen when adding a completed task on older TW versions.
+        if (not valid(output) and self.version < self.VERSION_2_4_5
+                and after_save):
+
+            # Make a copy, removing ID and UUID. It's most likely invalid
+            # (ID 0) if it failed to match a unique task.
+            data = copy.deepcopy(task._data)
+            data.pop('id', None)
+            data.pop('uuid', None)
+
+            taskfilter = self.filter_class(self)
+            for key, value in data.items():
+                taskfilter.add_filter_param(key, value)
+
+            output = self.execute_command(['export'] +
+                                          taskfilter.get_filter_params())
+
+        # If more than 1 task has been matched still, raise an exception
+        if not valid(output):
+            raise TaskWarriorException(
+                "Unique identifiers {0} with description: {1} matches "
+                "multiple tasks: {2}".format(
+                    task['uuid'] or task['id'], task['description'], output)
+            )
+
+        return json.loads(output[0])
+
+    def sync(self):
+        self.execute_command(['sync'])