Export the colours preview application from the library

Author: davep

Makefile

@@ -70,6 +70,10 @@ textual:			# Show the help for the textual command.
 borders:			# Show the Textual borders preview.
 	$(textual) borders
 
+.PHONY: colors
+colors:			# Show the Textual colours preview.
+	$(textual) colors
+
 .PHONY: console
 console:			# Run the textual console
 	$(textual) console

src/textual_dev/cli.py

@@ -214,9 +214,9 @@ def easing() -> None:
 @run.command("colors")
 def colors() -> None:
     """Explore the design system."""
-    from textual_dev.previews import colors
+    from textual_dev.previews import ColorsApp
 
-    colors.app.run()
+    ColorsApp().run()
 
 
 @run.command("keys")

src/textual_dev/previews/__init__.py

@@ -1,5 +1,6 @@
 """Provides the preview applications for the textual CLI tool."""
 
 from .borders import BorderApp
+from .colors import ColorsApp
 
-__all__ = ["BorderApp"]
+__all__ = ["BorderApp", "ColorsApp"]

src/textual_dev/previews/colors.py

@@ -73,7 +73,5 @@ def on_button_pressed(self, event: Button.Pressed) -> None:
         group.scroll_visible(top=True, speed=150)
 
 
-app = ColorsApp()
-
 if __name__ == "__main__":
-    app.run()
+    ColorsApp().run()