add dora-joy node publishing gamepad axes and buttons

examples/printer.py

@@ -0,0 +1,30 @@
+"""Prints every `joy` message, so `dataflow.yml` is self-contained.
+
+It exists so the repo's own dataflow can be validated and run by CI with no
+gamepad and no consumer attached. It is not a test of anything: it prints what
+arrived and forgets it.
+"""
+
+from dora import Node
+
+
+def main() -> None:
+    """Print one line per reading."""
+    node = Node("printer")
+    count = 0
+
+    for event in node:
+        if event["type"] != "INPUT" or event["id"] != "joy":
+            continue
+        row = event["value"][0].as_py()
+        count += 1
+        if not row["present"]:
+            print(f"joy {count:5d}  no gamepad", flush=True)
+            continue
+        axes = " ".join(f"{value:+6.3f}" for value in row["axes"])
+        held = ",".join(str(index) for index, down in enumerate(row["buttons"]) if down) or "-"
+        print(f"joy {count:5d}  axes [{axes}]  buttons [{held}]", flush=True)
+
+
+if __name__ == "__main__":
+    main()