Add support for trailing_stop_loss order_type

docs/configuration.md

@@ -277,7 +277,7 @@ For example, if your strategy is using a 1h timeframe, and you only want to buy
 
 ### Understand order_types
 
-The `order_types` configuration parameter maps actions (`buy`, `sell`, `stoploss`, `emergencysell`, `forcesell`, `forcebuy`) to order-types (`market`, `limit`, ...) as well as configures stoploss to be on the exchange and defines stoploss on exchange update interval in seconds.
+The `order_types` configuration parameter maps actions (`buy`, `sell`, `stoploss`, `trailing_stop_loss`, `emergencysell`, `forcesell`, `forcebuy`) to order-types (`market`, `limit`, ...) as well as configures stoploss to be on the exchange and defines stoploss on exchange update interval in seconds.
 
 This allows to buy using limit orders, sell using
 limit-orders, and create stoplosses using market orders. It also allows to set the
@@ -286,7 +286,7 @@ the buy order is fulfilled.
     
 `order_types` set in the configuration file overwrites values set in the strategy as a whole, so you need to configure the whole `order_types` dictionary in one place.
 
-If this is configured, the following 4 values (`buy`, `sell`, `stoploss` and
+If this is configured, the following 5 values (`buy`, `sell`, `stoploss`, `trailing_stop_loss` and
 `stoploss_on_exchange`) need to be present, otherwise the bot will fail to start.
 
 For information on (`emergencysell`,`forcesell`, `forcebuy`, `stoploss_on_exchange`,`stoploss_on_exchange_interval`,`stoploss_on_exchange_limit_ratio`) please see stop loss documentation [stop loss on exchange](stoploss.md)
@@ -301,6 +301,7 @@ order_types = {
     "forcebuy": "market",
     "forcesell": "market",
     "stoploss": "market",
+    "trailing_stop_loss": "limit",
     "stoploss_on_exchange": False,
     "stoploss_on_exchange_interval": 60,
     "stoploss_on_exchange_limit_ratio": 0.99,
@@ -317,6 +318,7 @@ Configuration:
     "forcebuy": "market",
     "forcesell": "market",
     "stoploss": "market",
+    "trailing_stop_loss": "limit",    
     "stoploss_on_exchange": false,
     "stoploss_on_exchange_interval": 60
 }

freqtrade/freqtradebot.py

@@ -1141,8 +1141,10 @@ class FreqtradeBot(LoggingMixin):
         :return: True if it succeeds (supported) False (not supported)
         """
         sell_type = 'sell'
-        if sell_reason in (SellType.STOP_LOSS, SellType.TRAILING_STOP_LOSS):
+        if sell_reason == SellType.STOP_LOSS:
             sell_type = 'stoploss'
+        elif sell_reason == SellType.TRAILING_STOP_LOSS:
+            sell_type = 'trailing_stop_loss'
 
         # if stoploss is on exchange and we are on dry_run mode,
         # we consider the sell price stop price

freqtrade/strategy/interface.py

@@ -100,6 +100,7 @@ class IStrategy(ABC):
         'buy': 'limit',
         'sell': 'limit',
         'stoploss': 'limit',
+        'trailing_stop_loss': 'limit',
         'stoploss_on_exchange': False,
         'stoploss_on_exchange_interval': 60,
     }