lazy: Properly override getattr calls

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

diff --git a/tasklib/backends.py b/tasklib/backends.py
index 1eb83b75407467c982d9a3a5465c8d160e1dd949..b15e8bd97afac69339d6cdeb64bce43d953616bc 100644 (file)
--- a/tasklib/backends.py
+++ b/tasklib/backends.py
@@ -1,4 +1,5 @@
 import abc
 import abc

+import copy

 import datetime
 import json
 import logging
 import datetime
 import json
 import logging


@@ -7,24 +8,15 @@ import re
 import six
 import subprocess
 
 import six
 import subprocess
 

-from .task import Task, TaskQuerySet
+from .task import Task, TaskQuerySet, ReadOnlyDictView

 from .filters import TaskWarriorFilter
 from .serializing import local_zone
 
 DATE_FORMAT_CALC = '%Y-%m-%dT%H:%M:%S'
 
 from .filters import TaskWarriorFilter
 from .serializing import local_zone
 
 DATE_FORMAT_CALC = '%Y-%m-%dT%H:%M:%S'
 

-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')
-

 logger = logging.getLogger(__name__)
 
 logger = logging.getLogger(__name__)
 

+

 class Backend(object):
 
     @abc.abstractproperty
 class Backend(object):
 
     @abc.abstractproperty


@@ -90,7 +82,18 @@ class TaskWarriorException(Exception):
     pass
 
 
     pass
 
 

-class TaskWarrior(object):
+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')
+

     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)
 


@@ -99,8 +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


@@ -110,7 +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


@@ -118,24 +122,24 @@ 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')
 


@@ -152,10 +156,11 @@ class TaskWarrior(object):
             if serialized_value is '':
                 escaped_serialized_value = ''
             else:
             if serialized_value is '':
                 escaped_serialized_value = ''
             else:

-                escaped_serialized_value = six.u("'{0}'").format(serialized_value)
+                escaped_serialized_value = six.u("'{0}'").format(
+                    serialized_value)

 
 

-            format_default = lambda: six.u("{0}:{1}").format(field,
-                                                      escaped_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)
 
             format_func = getattr(self, 'format_{0}'.format(field),
                                   format_default)


@@ -185,26 +190,26 @@ class TaskWarrior(object):
 
         old_dependencies = task._original_data.get('depends', set())
 
 
         old_dependencies = task._original_data.get('depends', set())
 

-        added = self['depends'] - old_dependencies
-        removed = old_dependencies - self['depends']
+        added = task['depends'] - old_dependencies
+        removed = old_dependencies - task['depends']

 
         # Removed dependencies need to be prefixed with '-'
         return 'depends:' + ','.join(
 
         # Removed dependencies need to be prefixed with '-'
         return 'depends:' + ','.join(

-                [t['uuid'] for t in added] +
-                ['-' + t['uuid'] for t in removed]
-            )
+            [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
 
     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 < VERSION_2_4_0:
+        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):
 
             return task._data['description']
         else:
             return six.u("description:'{0}'").format(task._data['description'] or '')
 
     def convert_datetime_string(self, value):
 

-        if self.version >= VERSION_2_4_0:
+        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()
             # For strings, use 'task calc' to evaluate the string to datetime
             # available since TW 2.4.0
             args = value.split()


@@ -216,17 +221,25 @@ class TaskWarrior(object):
                              "datetime, its type is not supported: {}"
                              .format(type(value)))
 
                              "datetime, its type is not supported: {}"
                              .format(type(value)))
 

+        return localized
+

     @property
     def filter_class(self):
         return TaskWarriorFilter
 
     # Public interface
 
     @property
     def filter_class(self):
         return TaskWarriorFilter
 
     # Public interface
 

-    def get_config(self):
+    @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].+$)')


@@ -236,7 +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):


@@ -266,7 +282,7 @@ 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)
 
     def merge_with(self, path, push=False):
             self.execute_command(['next'], allow_failure=False)
 
     def merge_with(self, path, push=False):


@@ -282,7 +298,7 @@ class TaskWarrior(object):
 
     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:


@@ -337,7 +353,7 @@ class TaskWarrior(object):
 
     def complete_task(self, task):
         # Older versions of TW do not stop active task at completion
 
     def complete_task(self, task):
         # Older versions of TW do not stop active task at completion

-        if self.version < VERSION_2_4_0 and task.active:
+        if self.version < self.VERSION_2_4_0 and task.active:

             task.stop()
 
         self.execute_command([task['uuid'], 'done'])
             task.stop()
 
         self.execute_command([task['uuid'], 'done'])


@@ -363,7 +379,7 @@ class TaskWarrior(object):
         # 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.
         # 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 < VERSION_2_4_5
+        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
                 and after_save):
 
             # Make a copy, removing ID and UUID. It's most likely invalid


@@ -376,15 +392,15 @@ class TaskWarrior(object):
             for key, value in data.items():
                 taskfilter.add_filter_param(key, value)
 
             for key, value in data.items():
                 taskfilter.add_filter_param(key, value)
 

-            output = self.execute_command(['export', '--'] +
-                taskfilter.get_filter_params())
+            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(
 
         # 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)
+                    task['uuid'] or task['id'], task['description'], output)

             )
 
         return json.loads(output[0])
             )
 
         return json.loads(output[0])