msc: clarify device role with a name

src/main.rs

@@ -1,4 +1,4 @@
-use std::io::Write;
+use std::io::Write; //for .flush()
 
 #[macro_use]
 extern crate lazy_static;
@@ -7,21 +7,21 @@ mod pedals;
 
 fn main() -> () {
     lazy_static! {
-        static ref D: evdev::Device = {
+        static ref INPUT_DEVICE: evdev::Device = {
             let d = pick_device();
             d
         };
     }
-    println!("{}", D.name().unwrap_or("Unknown device"));
+    println!("{}", INPUT_DEVICE.name().unwrap_or("Unknown device"));
 
-    run(&D, crate::pedals::pedals().into_iter());
+    run(&INPUT_DEVICE, crate::pedals::pedals().into_iter());
 }
 
-fn run(device: &'static evdev::Device, pedals: impl Iterator<Item = Pedal>) {
+fn run(input_device: &'static evdev::Device, pedals: impl Iterator<Item = Pedal>) {
     let mut handles: Vec<_> = Vec::new();
     for pedal in pedals {
         let handle = std::thread::spawn(move || loop {
-            if device.get_key_state().unwrap().contains(pedal.key) {
+            if input_device.get_key_state().unwrap().contains(pedal.key) {
                 (*pedal.action)();
             }
             std::thread::sleep(std::time::Duration::from_millis(100));