From 639b6bc4f6156e04907bc70f182490887c56d88e Mon Sep 17 00:00:00 2001
From: Janne Sinivirta <janne.sinivirta@gmail.com>
Date: Mon, 4 Jun 2018 14:13:19 +0300
Subject: [PATCH] set and create default datadir based on used exchange

---
 freqtrade/arguments.py     |  5 ++---
 freqtrade/configuration.py | 14 ++++++++++++--
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/freqtrade/arguments.py b/freqtrade/arguments.py
index fd4a88826..9e88d08ca 100644
--- a/freqtrade/arguments.py
+++ b/freqtrade/arguments.py
@@ -4,7 +4,6 @@ This module contains the argument manager class
 
 import argparse
 import logging
-import os
 import re
 import arrow
 from typing import List, Tuple, Optional
@@ -72,9 +71,9 @@ class Arguments(object):
         )
         self.parser.add_argument(
             '-d', '--datadir',
-            help='path to backtest data (default: %(default)s',
+            help='path to backtest data',
             dest='datadir',
-            default=os.path.join('freqtrade', 'tests', 'testdata'),
+            default=None,
             type=str,
             metavar='PATH',
         )
diff --git a/freqtrade/configuration.py b/freqtrade/configuration.py
index 77b5b4447..54146199d 100644
--- a/freqtrade/configuration.py
+++ b/freqtrade/configuration.py
@@ -1,7 +1,7 @@
 """
 This module contains the configuration class
 """
-
+import os
 import json
 import logging
 from argparse import Namespace
@@ -113,6 +113,14 @@ class Configuration(object):
 
         return config
 
+    def _create_default_datadir(self, config: Dict[str, Any]) -> str:
+        exchange_name = config.get('exchange', {}).get('name').lower()
+        default_path = os.path.join('user_data', 'data', exchange_name)
+        if not os.path.isdir(default_path):
+            os.makedirs(default_path)
+            logger.info(f'Created data directory: {default_path}')
+        return default_path
+
     def _load_backtesting_config(self, config: Dict[str, Any]) -> Dict[str, Any]:
         """
         Extract information for sys.argv and load Backtesting configuration
@@ -145,7 +153,9 @@ class Configuration(object):
         # If --datadir is used we add it to the configuration
         if 'datadir' in self.args and self.args.datadir:
             config.update({'datadir': self.args.datadir})
-            logger.info('Using data folder: %s ...', self.args.datadir)
+        else:
+            config.update({'datadir': self._create_default_datadir(config)})
+        logger.info('Using data folder: %s ...', config.get('datadir'))
 
         # If -r/--refresh-pairs-cached is used we add it to the configuration
         if 'refresh_pairs' in self.args and self.args.refresh_pairs: