Support future times with timedeltashort tag (#403)

activities/templatetags/activity_tags.py

@@ -14,10 +14,11 @@ def timedeltashort(value: datetime.datetime):
     """
     if not value:
         return ""
-    # TODO: Handle things in the future properly
     delta = timezone.now() - value
     seconds = int(delta.total_seconds())
-    days = delta.days
+    sign = "-" if seconds < 0 else ""
+    seconds = abs(seconds)
+    days = abs(delta.days)
     if seconds < 60:
         text = f"{seconds:0n}s"
     elif seconds < 60 * 60:
@@ -31,7 +32,7 @@ def timedeltashort(value: datetime.datetime):
     else:
         years = max(days // 365.25, 1)
         text = f"{years:0n}y"
-    return text
+    return sign + text
 
 
 @register.simple_tag(takes_context=True)

tests/activities/templatetags/test_activity_tags.py

@@ -22,3 +22,11 @@ def test_timedeltashort():
     assert timedeltashort(value - timedelta(days=364)) == "364d"
     assert timedeltashort(value - timedelta(days=365)) == "1y"
     assert timedeltashort(value - timedelta(days=366)) == "1y"
+
+    assert timedeltashort(value + timedelta(seconds=2.1)) == "-2s"
+    assert timedeltashort(value + timedelta(minutes=2, seconds=1)) == "-2m"
+    assert timedeltashort(value + timedelta(hours=2, seconds=1)) == "-2h"
+    assert timedeltashort(value + timedelta(days=2)) == "-2d"
+    assert timedeltashort(value + timedelta(days=364)) == "-364d"
+    assert timedeltashort(value + timedelta(days=365)) == "-1y"
+    assert timedeltashort(value + timedelta(days=366)) == "-1y"