feat: split to weather and gismeteo modules

gismeteo/datehelp.py

@@ -0,0 +1,30 @@
+import datetime
+
+import dateparser
+import dateparser.date_parser
+
+
+def parse(value: str) -> datetime.date:
+    if value == "today" or value == "mock":
+        return datetime.date.today()
+    elif value == "tomorrow":
+        return datetime.date.today() + datetime.timedelta(days=1)
+    elif value.endswith("-day"):
+        days = int(value.split("-")[0]) - 1
+        return datetime.date.today() + datetime.timedelta(days=days)
+    else:
+        date = dateparser.parse(value)
+        if date is None:
+            raise ValueError(value)
+        return date.date()
+
+
+def dump(date: datetime.date) -> str:
+    today = datetime.date.today()
+    days = (date - today).days
+    if days == 0:
+        return "today"
+    elif days == 1:
+        return "tomorrow"
+    else:
+        return f"{days + 1}-day"