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

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

src/capture/macos.rs

@@ -0,0 +1,33 @@
+use crate::capture::InputCapture;
+use crate::client::{ClientEvent, ClientHandle};
+use crate::event::Event;
+use anyhow::{anyhow, Result};
+use futures_core::Stream;
+use std::task::{Context, Poll};
+use std::{io, pin::Pin};
+
+pub struct MacOSInputCapture;
+
+impl MacOSInputCapture {
+    pub fn new() -> Result<Self> {
+        Err(anyhow!("not yet implemented"))
+    }
+}
+
+impl Stream for MacOSInputCapture {
+    type Item = io::Result<(ClientHandle, Event)>;
+
+    fn poll_next(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        Poll::Pending
+    }
+}
+
+impl InputCapture for MacOSInputCapture {
+    fn notify(&mut self, _event: ClientEvent) -> io::Result<()> {
+        Ok(())
+    }
+
+    fn release(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}