make args available for optimizer and use them instead of guessing from params

freqtrade/optimize/hyperopt.py

@@ -403,24 +403,27 @@ def buy_strategy_generator(params: Dict[str, Any]) -> Callable:
     return populate_buy_trend
 
 
+def generate_optimizer(args):
     def optimizer(params):
         global _CURRENT_TRIES
 
         strategy = Strategy()
-    if 'roi_t1' in params:
+        if has_space(args.spaces, 'roi'):
             strategy.minimal_roi = generate_roi_table(params)
 
-    if 'trigger' in params:
+        if has_space(args.spaces, 'buy'):
             backtesting.populate_buy_trend = buy_strategy_generator(params)
 
-    if 'stoploss' in params:
+        if has_space(args.spaces, 'stoploss'):
             stoploss = params['stoploss']
         else:
             stoploss = strategy.stoploss
 
         results = backtest({'stake_amount': OPTIMIZE_CONFIG['stake_amount'],
                             'processed': PROCESSED,
-                        'stoploss': stoploss})
+                            'stoploss': stoploss,
+                            'realistic': args.realistic_simulation,
+                            })
         result_explanation = format_results(results)
 
         total_profit = results.profit_percent.sum()
@@ -451,6 +454,8 @@ def optimizer(params):
             'result': result_explanation,
         }
 
+    return optimizer
+
 
 def format_results(results: DataFrame):
     return ('{:6d} trades. Avg profit {: 5.2f}%. '
@@ -519,7 +524,7 @@ def start(args):
 
     try:
         best_parameters = fmin(
-            fn=optimizer,
+            fn=generate_optimizer(args),
             space=hyperopt_space(args.spaces),
             algo=tpe.suggest,
             max_evals=TOTAL_TRIES,