add two extra flags for cli

textual_image/__main__.py

@@ -2,6 +2,7 @@
 
 """Run the textual_image demo."""
 
+from pathlib import Path
 import sys
 from argparse import ArgumentParser
 from importlib.util import find_spec
@@ -11,20 +12,33 @@
 textual_available = bool(find_spec("textual"))
 default_mode = "rich" if find_spec("textual") is None else "textual"
 
+def path_exists(path_str: str) -> Path:
+    """Check if the provided path exists and is a file."""
+    path = Path(path_str)
+    if not path.is_file():
+        raise ValueError(f"The provided path '{path_str}' does not exist or is not a file.")
+    return path
+
 parser = ArgumentParser(description="Demo the capabilities of textual-image")
 parser.add_argument("mode", choices=["rich", "textual"], nargs="?", default=default_mode)
 parser.add_argument("-m", "--method", choices=RENDERING_METHODS.keys(), default="auto")
+parser.add_argument("--image", help="Path to an image file to use for the demo. If not provided, a default image will be used.", default=Path(__file__).parent / "gracehopper.jpg", type=path_exists)
+parser.add_argument("--transparent", action="store_true", help="Use a transparent background for the demo (only applicable to the Textual mode).")
 arguments = parser.parse_args()
 
 if arguments.mode == "rich":
-    from textual_image.demo.renderable import run as run_rich_demo
+    from textual_image.demo import renderable
+
+    renderable.TEST_IMAGE = Path(arguments.image)
 
-    run_rich_demo(arguments.method)
+    renderable.run(arguments.method)
 elif not textual_available:
     sys.stderr.write(
         "Optional Textual dependency not available. Install this package as `textual-image[textual]` for Textual support."
     )
 else:
-    from textual_image.demo.widget import run as run_textual_demo
+    from textual_image.demo import widget
+
+    widget.TEST_IMAGE = Path(arguments.image)
 
-    run_textual_demo(arguments.method)
+    widget.run(arguments.method, transparent=arguments.transparent)

textual_image/demo/widget.py

@@ -328,9 +328,9 @@ def set_rendering_method(self, rendering_method: str) -> None:
         self.image_type = rendering_method
 
 
-def run(rendering_method: str = "auto") -> None:
+def run(rendering_method: str = "auto", transparent: bool = False) -> None:
     """Showcase textual-image's Rich renderables."""
-    app = DemoApp()
+    app = DemoApp(ansi_color=transparent)
     app.image_type = rendering_method
     app.run()