Ei protocol support using reis

Cargo.toml

@@ -69,7 +69,7 @@ encoding_rs = { version = "0.8.33", optional = true }
 profiling = "1.0"
 smallvec = "1.11"
 pixman = { version = "0.1.0", features = ["drm-fourcc"], optional = true }
-
+reis = { git = "https://github.com/ids1024/reis", features = ["calloop"] }
 
 [dev-dependencies]
 clap = { version = "4", features = ["derive"] }

anvil/src/lib.rs

@@ -11,6 +11,7 @@ pub mod cursor;
 pub mod drawing;
 pub mod focus;
 pub mod input_handler;
+pub mod libei;
 pub mod render;
 pub mod shell;
 pub mod state;

anvil/src/libei.rs

@@ -0,0 +1,32 @@
+use reis::calloop::EisListenerSource;
+use reis::eis;
+use smithay::reexports::reis;
+
+use smithay::backend::libei::EiInput;
+use smithay::reexports::calloop;
+
+use crate::state::AnvilState;
+use crate::udev::UdevData;
+
+pub fn listen_eis(handle: &calloop::LoopHandle<'static, AnvilState<UdevData>>) {
+    let path = reis::default_socket_path().unwrap();
+    std::fs::remove_file(&path); // XXX in use?
+    let listener = eis::Listener::bind(&path).unwrap();
+    let listener_source = EisListenerSource::new(listener);
+
+    std::env::set_var("LIBEI_SOCKET", path);
+
+    let handle_clone = handle.clone();
+    handle
+        .insert_source(listener_source, move |context, _, _| {
+            let source = EiInput::new(context);
+            handle_clone
+                .insert_source(source, |event, _, data| {
+                    let dh = data.display_handle.clone();
+                    data.process_input_event(&dh, event);
+                })
+                .unwrap();
+            Ok(calloop::PostAction::Continue)
+        })
+        .unwrap();
+}

anvil/src/udev.rs

@@ -484,6 +484,8 @@ pub fn run_udev() {
     #[cfg(feature = "xwayland")]
     state.start_xwayland();
 
+    crate::libei::listen_eis(&event_loop.handle());
+
     /*
      * And run our loop
      */