Plotting: add alias `--backtest-filename` for `--export-filename`

makes it easier to discover how to use this argument

docs/plotting.md

@@ -318,8 +318,8 @@ optional arguments:
                         Specify what timerange of data to use.
   --export EXPORT       Export backtest results, argument are: trades.
                         Example: `--export=trades`
-  --export-filename PATH
-                        Save backtest results to the file with this filename.
+  --export-filename PATH, --backtest-filename PATH
+                        Use backtest results from this filename.
                         Requires `--export` to be set as well. Example:
                         `--export-filename=user_data/backtest_results/backtest
                         _today.json`

freqtrade/commands/arguments.py

@@ -74,7 +74,7 @@ ARGS_PLOT_DATAFRAME = ["pairs", "indicators1", "indicators2", "plot_limit",
                        "db_url", "trade_source", "export", "exportfilename",
                        "timerange", "timeframe", "no_trades"]
 
-ARGS_PLOT_PROFIT = ["pairs", "timerange", "export", "exportfilename", "db_url",
+ARGS_PLOT_PROFIT = ["pairs", "timerange", "export", "exportfilename", "backtestfilename", "db_url",
                     "trade_source", "timeframe", "plot_auto_open"]
 
 ARGS_INSTALL_UI = ["erase_ui_only", 'ui_version']

freqtrade/commands/cli_options.py

@@ -182,11 +182,17 @@ AVAILABLE_CLI_OPTIONS = {
 
     ),
     "exportfilename": Arg(
-        '--export-filename',
-        help='Save backtest results to the file with this filename. '
-        'Requires `--export` to be set as well. '
-        'Example: `--export-filename=user_data/backtest_results/backtest_today.json`',
-        metavar='PATH',
+        "--export-filename",
+        help="Save backtest results to the file with this filename. "
+        "Requires `--export` to be set as well. "
+        "Example: `--export-filename=user_data/backtest_results/backtest_today.json`",
+        metavar="PATH",
+    ),
+    "backtestfilename": Arg(
+        "--backtest-filename",
+        help="Use backtest results from this filename."
+        "Example: `--backtest-filename=user_data/backtest_results/backtest_today.json`",
+        metavar="PATH",
     ),
     "disableparamexport": Arg(
         '--disable-param-export',

freqtrade/configuration/configuration.py

@@ -430,6 +430,15 @@ class Configuration:
         self._args_to_config(config, argname='dataformat_trades',
                              logstring='Using "{}" to store trades data.')
 
+        if self.args.get('backtestfilename'):
+            self._args_to_config(config, argname='backtestfilename',
+                             logstring='Fetching backtest results from {} ...')
+            config['backtestfilename'] = Path(config['backtestfilename'])
+        else:
+            config['backtestfilename'] = (config['user_data_dir']
+                                    / 'backtest_results')
+
+
     def _process_data_options(self, config: Dict[str, Any]) -> None:
 
         self._args_to_config(config, argname='new_pairs_days',

freqtrade/plot/plotting.py

@@ -61,7 +61,11 @@ def init_plotscript(config, markets: List, startup_candles: int = 0):
                                             startup_candles, min_date)
 
     no_trades = False
-    filename = config.get('exportfilename')
+    for arg_name in ['exportfilename', 'backtestfilename']:
+        filename = config.get(arg_name)
+        if filename is not None:
+            break
+
     if config.get('no_trades', False):
         no_trades = True
     elif config['trade_source'] == 'file':