rename producer, consumer to emulation and capture (#98)

input emulation / input capture is clearer than event consumer and producer

src/capture/windows.rs

@@ -0,0 +1,35 @@
+use anyhow::{anyhow, Result};
+use core::task::{Context, Poll};
+use futures::Stream;
+use std::{io, pin::Pin};
+
+use crate::{
+    capture::InputCapture,
+    client::{ClientEvent, ClientHandle},
+    event::Event,
+};
+
+pub struct WindowsInputCapture {}
+
+impl InputCapture for WindowsInputCapture {
+    fn notify(&mut self, _event: ClientEvent) -> io::Result<()> {
+        Ok(())
+    }
+
+    fn release(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}
+
+impl WindowsInputCapture {
+    pub(crate) fn new() -> Result<Self> {
+        Err(anyhow!("not implemented"))
+    }
+}
+
+impl Stream for WindowsInputCapture {
+    type Item = io::Result<(ClientHandle, Event)>;
+    fn poll_next(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        Poll::Pending
+    }
+}