Add callback functions to new-strategy --template advanced

freqtrade/templates/base_strategy.py.j2

@@ -137,3 +137,4 @@ class {{ strategy }}(IStrategy):
             ),
             'sell'] = 1
         return dataframe
+    {{ additional_methods | indent(4) }}

freqtrade/templates/subtemplates/strategy_methods_advanced.j2

@@ -0,0 +1,36 @@
+
+def check_buy_timeout(self, pair: str, trade: Trade, order: Dict, **kwargs) -> bool:
+    """
+    Check buy timeout function callback.
+    This method can be used to override the buy-timeout.
+    It is called whenever a limit buy order has been created,
+    and is not yet fully filled.
+    Configuration options in `unfilledtimeout` will be verified before this,
+    so ensure to set these timeouts high enough.
+
+    When not implemented by a strategy, this simply returns False.
+    :param pair: Pair the trade is for
+    :param trade: trade object.
+    :param order: Order dictionary as returned from CCXT.
+    :param **kwargs: Ensure to keep this here so updates to this won't break your strategy.
+    :return bool: When True is returned, then the buy-order is cancelled.
+    """
+    return False
+
+def check_sell_timeout(self, pair: str, trade: Trade, order: Dict, **kwargs) -> bool:
+    """
+    Check sell timeout function callback.
+    This method can be used to override the sell-timeout.
+    It is called whenever a limit sell order has been created,
+    and is not yet fully filled.
+    Configuration options in `unfilledtimeout` will be verified before this,
+    so ensure to set these timeouts high enough.
+
+    When not implemented by a strategy, this simply returns False.
+    :param pair: Pair the trade is for
+    :param trade: trade object.
+    :param order: Order dictionary as returned from CCXT.
+    :param **kwargs: Ensure to keep this here so updates to this won't break your strategy.
+    :return bool: When True is returned, then the sell-order is cancelled.
+    """
+    return False