Simulate supported keys

src/main.rs

@@ -6,7 +6,7 @@ mod select;
 mod output;
 
 fn event_loop(input_device: &mut Device) -> Result<(), Box<dyn Error>> {
-    let mut output_device = output::build_device().unwrap();
+    let mut output_device = output::build_device(input_device).unwrap();
     for _ in 0..5 {
         if !select::is_readable(input_device) { continue }
 

src/output.rs

@@ -1,14 +1,11 @@
 use std::error::Error;
-use evdev::{AttributeSet, Key};
+use evdev::{Device};
 use evdev::uinput::{VirtualDevice, VirtualDeviceBuilder};
 
-pub fn build_device() -> Result<VirtualDevice, Box<dyn Error>> {
-    let mut keys = AttributeSet::<Key>::new();
-    keys.insert(Key::KEY_A);
-
+pub fn build_device(base_device: &Device) -> Result<VirtualDevice, Box<dyn Error>> {
     let device = VirtualDeviceBuilder::new()?
         .name("xremap")
-        .with_keys(&keys)?
+        .with_keys(base_device.supported_keys().unwrap())?
         .build()
         .unwrap();