break stuff by adding new param

xexe/inputs_handling.py

@@ -5,7 +5,7 @@ from typing import Union
 
 from money.currency import Currency
 
-from xexe.constants import DEFAULT_CURRENCIES
+from xexe.constants import DEFAULT_CURRENCIES, RATES_SOURCES
 from xexe.utils import DateRange
 
 logger = logging.getLogger()
@@ -16,6 +16,7 @@ def handle_get_rates_inputs(
     end_date: Union[datetime.datetime, datetime.date],
     currencies: Union[None, str],
     dry_run: bool,
+    rates_source: str,
     ignore_warnings: bool,
     output: Union[str, pathlib.Path],
 ):
@@ -36,6 +37,9 @@ def handle_get_rates_inputs(
         logger.info("No currency list passed. Running for default currencies.")
         currencies = DEFAULT_CURRENCIES
 
+    if rates_source not in RATES_SOURCES:
+        raise ValueError(f"--rates-source must be one of {RATES_SOURCES.keys()}.")
+
     # The Path constructor is idempotent, so this works equally fine if output
     # is a string or an actual Path object.
     output = pathlib.Path(output)
@@ -46,6 +50,7 @@ def handle_get_rates_inputs(
         "date_range": date_range,
         "currencies": currencies,
         "dry_run": dry_run,
+        "rates_source": rates_source,
         "ignore_warnings": ignore_warnings,
         "output": output,
     }