Add reusable --parameter decorator

Author: JosueNina

lean/click.py

@@ -404,3 +404,23 @@ def ensure_options(options: List[str]) -> None:
 You are missing the following option{"s" if len(missing_options) > 1 else ""}:
 {''.join(help_formatter.buffer)}
     """.strip())
+
+def parameter_option(func: FC) -> FC:
+    """Decorator that adds the --parameter option to Click commands.
+
+    This decorator can be used to add support for passing parameters via command line.
+
+    Example usage:
+        @parameter_option
+        def backtest(...):
+            ...
+    """
+    func = option(
+        "--parameter",
+        type=(str, str),
+        multiple=True,
+        help="Key-value pairs to pass as backtest parameters. "
+             "Values can be string, int, or float.\n"
+             "Example: --parameter symbol AAPL --parameter period 10 --parameter threshold 0.05"
+    )(func)
+    return func

lean/commands/backtest.py

@@ -15,7 +15,7 @@
 from typing import List, Optional, Tuple
 from click import command, option, argument, Choice
 
-from lean.click import LeanCommand, PathParameter
+from lean.click import LeanCommand, PathParameter, parameter_option
 from lean.constants import DEFAULT_ENGINE_IMAGE, LEAN_ROOT_PATH
 from lean.container import container, Logger
 from lean.models.utils import DebuggingMethod
@@ -282,12 +282,7 @@ def _migrate_csharp_csproj(project_dir: Path) -> None:
               is_flag=True,
               default=False,
               help="Use the local LEAN engine image instead of pulling the latest version")
-@option("--parameter",
-              type=(str, str),
-              multiple=True,
-              help="Key-value pairs to pass as backtest parameters. "
-                    "Values can be string, int, or float.\n"
-                    "Example: --parameter symbol AAPL --parameter period 10 --parameter threshold 0.05")
+@parameter_option
 def backtest(project: Path,
              output: Optional[Path],
              detach: bool,

lean/commands/cloud/backtest.py

@@ -13,7 +13,7 @@
 
 from typing import List, Optional, Tuple
 from click import command, argument, option
-from lean.click import LeanCommand
+from lean.click import LeanCommand, parameter_option
 from lean.container import container
 
 @command(cls=LeanCommand)
@@ -27,12 +27,7 @@
               is_flag=True,
               default=False,
               help="Automatically open the results in the browser when the backtest is finished")
-@option("--parameter",
-              type=(str, str),
-              multiple=True,
-              help="Key-value pairs to pass as backtest parameters. "
-                    "Values can be string, int, or float.\n"
-                    "Example: --parameter symbol AAPL --parameter period 10 --parameter threshold 0.05")
+@parameter_option
 def backtest(project: str, name: Optional[str], push: bool, open_browser: bool, parameter: List[Tuple[str, str]]) -> None:
     """Backtest a project in the cloud.