Validate plot arguments

freqtrade/plot/plot_utils.py

@@ -1,15 +1,24 @@
 from argparse import Namespace
-
+from freqtrade import OperationalException
 from freqtrade.state import RunMode
 from freqtrade.utils import setup_utils_configuration
 
 
+def validate_plot_args(args: Namespace):
+    args_tmp = vars(args)
+    if not args_tmp.get('datadir') and not args_tmp.get('config'):
+        raise OperationalException(
+            "You need to specify either `--datadir` or `--config` "
+            "for plot-profit and plot-dataframe.")
+
+
 def start_plot_dataframe(args: Namespace) -> None:
     """
     Entrypoint for dataframe plotting
     """
     # Import here to avoid errors if plot-dependencies are not installed.
     from freqtrade.plot.plotting import analyse_and_plot_pairs
+    validate_plot_args(args)
     config = setup_utils_configuration(args, RunMode.PLOT)
 
     analyse_and_plot_pairs(config)
@@ -21,6 +30,7 @@ def start_plot_profit(args: Namespace) -> None:
     """
     # Import here to avoid errors if plot-dependencies are not installed.
     from freqtrade.plot.plotting import plot_profit
+    validate_plot_args(args)
     config = setup_utils_configuration(args, RunMode.PLOT)
 
     plot_profit(config)