Add shortcut for mapping 1 device

src/main.rs

@@ -7,19 +7,14 @@ extern crate inotify;
 #[macro_use]
 extern crate nix;
 
-use rusty_keys::KeyMaps;
+use rusty_keys::{KeyMaps, Device};
 
 use ffi::*;
 use libc::{c_int, input_event};
-
-//use std::thread;
-//use std::time::Duration;
-
 use std::process::{exit, Command};
 use std::fs::File;
 use std::io::Read;
-use std::{env, mem};
+use std::{env, mem, thread};
-use std::thread;
 use std::sync::mpsc;
 use std::sync::mpsc::Sender;
 
@@ -70,6 +65,17 @@ fn main_res() -> Result<()> {
     let mut key_map = KeyMaps::from_cfg(&key_map, &config.config_file);
     //println!("keymaps: {:?}", keymaps);
 
+    if config.device_files.len() == 1 {
+        // shortcut, don't bother with threads
+        let mut input_device = InputDevice::open(&config.device_files[0])?;
+        input_device.grab()?;
+
+        loop {
+            let event = input_device.read_event()?;
+            send_event(&mut key_map, event, &device)?
+        }
+    } else {
+        // start up some intra thread communication
         let (tx, rx) = mpsc::channel();
 
         if config.device_files.len() > 0 {
@@ -122,13 +128,19 @@ fn main_res() -> Result<()> {
         }
         drop(tx); // drop our last one, so when the threads finish, everything stops
         // process all events
-    for mut event in rx {
+        for event in rx {
+            send_event(&mut key_map, event, &device)?
+        }
+    }
+    Ok(())
+}
+
+fn send_event(key_map: &mut KeyMaps, mut event: input_event, device: &Device) -> Result<()> {
     if event.type_ == EV_KEY_U16 {
         key_map.send_event(&mut event, &device)?
     } else {
         device.write_event(&mut event)?
     }
-    }
     Ok(())
 }