Document expansion of --pairs, add download-inactive

freqtrade/commands/data_commands.py

@@ -11,6 +11,7 @@ from freqtrade.data.history import (convert_trades_to_ohlcv, refresh_backtest_oh
 from freqtrade.enums import RunMode
 from freqtrade.exceptions import OperationalException
 from freqtrade.exchange import timeframe_to_minutes
+from freqtrade.exchange.exchange import market_is_active
 from freqtrade.plugins.pairlist.pairlist_helpers import expand_pairlist
 from freqtrade.resolvers import ExchangeResolver
 
@@ -47,11 +48,13 @@ def start_download_data(args: Dict[str, Any]) -> None:
 
     # Init exchange
     exchange = ExchangeResolver.load_exchange(config['exchange']['name'], config, validate=False)
+    markets = [p for p, m in exchange.markets.items() if market_is_active(m)
+               or config.get('include_inactive')]
+    expanded_pairs = expand_pairlist(config['pairs'], markets)
+
     # Manual validations of relevant settings
     if not config['exchange'].get('skip_pair_validation', False):
-        exchange.validate_pairs(config['pairs'])
-    expanded_pairs = expand_pairlist(config['pairs'], list(exchange.markets))
-
+        exchange.validate_pairs(expanded_pairs)
     logger.info(f"About to download pairs: {expanded_pairs}, "
                 f"intervals: {config['timeframes']} to {config['datadir']}")