feat(input): add clear method

src/textual/widgets/_input.py

@@ -481,6 +481,10 @@ def insert_text_at_cursor(self, text: str) -> None:
             self.value = f"{before}{text}{after}"
             self.cursor_position += len(text)
 
+    def clear(self) -> None:
+        """Clear the input."""
+        self.value = ""
+
     def action_cursor_left(self) -> None:
         """Move the cursor one position to the left."""
         self.cursor_position -= 1

tests/input/test_input_clear.py

@@ -0,0 +1,16 @@
+from textual.app import App, ComposeResult
+from textual.widgets import Input
+
+
+class InputApp(App):
+    def compose(self) -> ComposeResult:
+        yield Input("Hello, World!")
+
+
+async def test_input_clear():
+    async with InputApp().run_test() as pilot:
+        input_widget = pilot.app.query_one(Input)
+        assert input_widget.value == "Hello, World!"
+        input_widget.clear()
+        await pilot.pause()
+        assert input_widget.value == ""