feat: Scaffold download entry point

src/orcestradownloader/cli/__main__.py

@@ -6,7 +6,7 @@
 import click
 from click import Group, MultiCommand
 
-
+from pathlib import Path
 from orcestradownloader.logging_config import set_log_verbosity
 from orcestradownloader.managers import REGISTRY, DatasetManager, UnifiedDataManager
 from orcestradownloader.models import ICBSet, PharmacoSet, RadioSet, ToxicoSet, XevaSet
@@ -92,10 +92,36 @@ def _table(ctx, force: bool = False, verbose: int = 1, quiet: bool = False):
 				manager = UnifiedDataManager(force=force)
 				manager.print_one_table(name)
 
+			@ds_group.command(name='download')
+			@click.option('--overwrite', '-o', is_flag=True, help='Overwrite existing file, if it exists.', default=False, show_default=True)
+			@click.option('--filename', '-f', help='Filename to save the file as. Defaults to the name of the dataset', default=None, type=str, required=False)
+			@click.option('--directory', '-d', help='Directory to save the file to', default=Path.cwd(), type=click.Path(exists=True, file_okay=False, dir_okay=True, writable=True, path_type=Path), required=True)
+			@click.argument(
+				'name',
+				type=str,
+				required=True,
+				nargs=-1,
+				metavar='[NAME OF DATASET]'
+			)
+			@click.option('--force', is_flag=True, help='Force fetch new data from the API. Useful if the data has been updated on the API.', default=False, show_default=True)
+			@set_log_verbosity()
+			@click.pass_context
+			def _download(
+				ctx, 
+				directory: Path,  
+				force: bool = False, 
+				verbose: int = 1, 
+				quiet: bool = False, 
+				filename: str | None = None, 
+				overwrite: bool = False
+			):
+				"""Download a file for this dataset."""
+				click.echo(f'Downloading {name} to {directory}')
 			return ds_group
 		return None
 
 	def format_usage(self, ctx, formatter):
+		"""Custom string for the Usage section of the help page."""
 		formatter.write_usage(
 			"orcestra",
 			"[DATASET_TYPE] [SUBCOMMAND] [ARGS]..."