Test on Linux and OSX

Implement method to get MayaDT instance as local timezone-aware datetime instance

.travis.yml

@@ -1,4 +1,8 @@
 language: python
+os:
+  - linux
+  - osx
+
 python:
   - "2.7"
   - "3.6"

README.rst

@@ -22,6 +22,10 @@ Maya is mostly built around the headaches and use-cases around parsing datetime
 
 .. image:: https://farm4.staticflickr.com/3702/33288285996_5b69d2b8f7_k_d.jpg
 
+Art by `Sam Flores
+<https://www.instagram.com/samagram12/>`_ (Photo by `Kenneth Reitz
+<https://www.instagram.com/kennethreitz/>`_). 
+
 
 ☤ Basic Usage of Maya
 ---------------------

maya/__version__.py

@@ -1 +1 @@
-__version__ = '0.3.4'
+__version__ = '0.4.2'

maya/core.py

@@ -152,7 +152,7 @@ class MayaDT(object):
 
     def subtract_date(self, **kwargs):
         """Returns a timedelta object with the duration between the dates"""
-        return timedelta(self.epoch - kwargs['dt'].epoch)
+        return timedelta(seconds=self.epoch - kwargs['dt'].epoch)
 
     def snap(self, instruction):
         """
@@ -257,6 +257,14 @@ class MayaDT(object):
                 dt = dt.replace(tzinfo=self._tz)
         return dt
 
+    def local_datetime(self):
+        """Returns a local timezone-aware datetime object
+
+        It's the same as:
+        mayaDt.datetime(to_timezone=mayaDt.local_timezone)
+        """
+        return self.datetime(to_timezone=self.local_timezone, naive=False)
+
     def iso8601(self):
         """Returns an ISO 8601 representation of the MayaDT."""
         # Get a timezone-naive datetime.
@@ -675,7 +683,7 @@ def now():
     return MayaDT(epoch=epoch)
 
 
-def when(string, timezone='UTC', prefer_past=False):
+def when(string, timezone='UTC', prefer_dates_from='current_period'):
     """"Returns a MayaDT instance for the human moment specified.
 
     Powered by dateparser. Useful for scraping websites.
@@ -686,16 +694,20 @@ def when(string, timezone='UTC', prefer_past=False):
     Keyword Arguments:
         string -- string to be parsed
         timezone -- timezone referenced from (default: 'UTC')
-        prefer_past -- prefer parsing ambiguous date as in the past
+        prefer_dates_from -- what dates are prefered when `string` is ambigous.
+                             options are 'past', 'future', and 'current_period'
+                             (default: 'current_period'). see: [1]
 
+    Reference:
+        [1] dateparser.readthedocs.io/en/latest/usage.html#handling-incomplete-dates
     """
     settings = {
         'TIMEZONE': timezone,
         'RETURN_AS_TIMEZONE_AWARE': True,
         'TO_TIMEZONE': 'UTC',
+        'PREFER_DATES_FROM': prefer_dates_from,
     }
-    if prefer_past:
-        settings['PREFER_DATES_FROM'] = 'past'
+
     dt = dateparser.parse(string, settings=settings)
     if dt is None:
         raise ValueError('invalid datetime input specified.')

setup.py

@@ -25,7 +25,7 @@ required = [
     'pytz',
     'dateparser>=0.7.0',
     'tzlocal',
-    'pendulum>=1.0',
+    'pendulum>=1.0, <=1.5.1',
     'snaptime'
 ]
 

tests/test_maya.py

@@ -1,5 +1,6 @@
 import copy
 import time
+import calendar
 from datetime import timedelta, datetime as Datetime
 
 import pytz
@@ -191,16 +192,46 @@ def test_parse(string, kwds, expected):
 
 @pytest.mark.usefixtures("frozen_now")
 def test_when_past():
-    next_month = str(maya.now().add(months=1).month)
-    this_year = maya.now().year
-    last_year = this_year - 1
-    future_date = maya.when(next_month)
-    past_date = maya.when(next_month, prefer_past=True)
-    assert future_date.year == this_year
-    if next_month == '1':
-        assert past_date.year == this_year
-    else:
-        assert past_date.year == last_year
+    two_days_away = maya.now().add(days=2)
+
+    past_date = maya.when(
+            two_days_away.slang_date(),
+            prefer_dates_from='past')
+
+    assert past_date < maya.now()
+
+
+@pytest.mark.usefixtures("frozen_now")
+def test_when_future():
+    two_days_away = maya.now().add(days=2)
+
+    future_date = maya.when(
+            two_days_away.slang_date(),
+            prefer_dates_from='future')
+
+    assert future_date > maya.now()
+
+
+@pytest.mark.usefixtures("frozen_now")
+def test_when_past_day_name():
+    two_days_away = maya.now().add(days=2)
+
+    past_date = maya.when(
+            calendar.day_name[two_days_away.weekday],
+            prefer_dates_from='past')
+
+    assert past_date < maya.now()
+
+
+@pytest.mark.usefixtures("frozen_now")
+def test_when_future_day_name():
+    two_days_away = maya.now().add(days=2)
+
+    future_date = maya.when(
+            calendar.day_name[two_days_away.weekday],
+            prefer_dates_from='future')
+
+    assert future_date > maya.now()
 
 
 def test_datetime_to_timezone():
@@ -289,8 +320,8 @@ def test_dunder_sub():
 def test_mayaDT_sub():
     now = maya.now()
     then = now.add(days=1)
-    assert then - now == timedelta(24 * 60 * 60)
-    assert now - then == timedelta(-24 * 60 * 60)
+    assert then - now == timedelta(seconds=24 * 60 * 60)
+    assert now - then == timedelta(seconds=-24 * 60 * 60)
 
 
 def test_core_local_timezone(monkeypatch):
@@ -311,6 +342,28 @@ def test_core_local_timezone(monkeypatch):
     assert mdt.local_timezone == 'UTC'
 
 
+def test_getting_datetime_for_local_timezone(monkeypatch):
+
+    @property
+    def mock_local_tz(self):
+        class StaticTzInfo(object):
+            zone = 'Europe/Zurich'
+
+            def __repr__(self):
+                return "<StaticTzInfo 'Europe/Zurich'>"
+
+        return StaticTzInfo()
+
+    monkeypatch.setattr(maya.MayaDT, '_local_tz', mock_local_tz)
+
+    d = maya.parse('1994-02-21T12:00:00+05:30')
+
+    dt = pytz.timezone('Europe/Zurich').localize(
+            Datetime(1994, 2, 21, 7, 30))
+
+    assert d.local_datetime() == dt
+
+
 @pytest.mark.parametrize("when_str,snap_str,expected_when", [
     ('Mon, 21 Feb 1994 21:21:42 GMT', '@d',
      'Mon, 21 Feb 1994 00:00:00 GMT'),