Feature/permissive delta parsing

CHANGELOG.rst

@@ -16,6 +16,7 @@ not released yet
   an event
 * NEW properties of ikhal themes (dark and light) can now be overriden from the
   config file (via the new [palette] section, check the documenation)
+* NEW timedelta strings can now have a leading `+`, e.g. `+1d`
 
 0.11.2
 ======

khal/parse_datetime.py

@@ -289,14 +289,16 @@ def guesstimedeltafstr(delta_string: str) -> dt.timedelta:
     :param delta_string: string encoding time-delta, e.g. '1h 15m'
     """
 
-    tups = re.split(r'(-?\d+)', delta_string)
+    tups = re.split(r'(-?\+?\d+)', delta_string)
     if not re.match(r'^\s*$', tups[0]):
         raise ValueError(f'Invalid beginning of timedelta string "{delta_string}": "{tups[0]}"')
     tups = tups[1:]
     res = dt.timedelta()
 
     for num, unit in zip(tups[0::2], tups[1::2]):
         try:
+            if num[0] == '+':
+                num = num[1:]
             numint = int(num)
         except ValueError:
             raise DateTimeParseError(

tests/parse_datetime_test.py

@@ -193,13 +193,30 @@ def test_single(self):
     def test_seconds(self):
         assert dt.timedelta(seconds=10) == guesstimedeltafstr('10s')
 
+    def test_single_plus(self):
+        assert dt.timedelta(minutes=10) == guesstimedeltafstr('+10m')
+
+    def test_seconds_plus(self):
+        assert dt.timedelta(seconds=10) == guesstimedeltafstr('+10s')
+
+    def test_days_plus(self):
+        assert dt.timedelta(days=10) == guesstimedeltafstr('+10days')
+
     def test_negative(self):
         assert dt.timedelta(minutes=-10) == guesstimedeltafstr('-10m')
 
     def test_multi(self):
         assert dt.timedelta(days=1, hours=-3, minutes=10) == \
             guesstimedeltafstr(' 1d -3H 10min ')
 
+    def test_multi_plus(self):
+        assert dt.timedelta(days=1, hours=3, minutes=10) == \
+            guesstimedeltafstr(' 1d +3H 10min ')
+
+    def test_multi_plus_minus(self):
+        assert dt.timedelta(days=0, hours=21, minutes=10) == \
+            guesstimedeltafstr('+1d -3H 10min ')
+
     def test_multi_nospace(self):
         assert dt.timedelta(days=1, hours=-3, minutes=10) == \
             guesstimedeltafstr('1D-3hour10m')