diff --git a/src/main.rs b/src/main.rs
index e7a11a9..3f55eb3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,95 @@
-fn main() {
-    println!("Hello, world!");
+//! Footswitch-RS
+//! 
+//! `footswitch-rs` enables you to use footswitches of <xxx>
+
+mod key_operations;
+
+#[macro_use]
+extern crate structopt;
+extern crate hidapi;
+extern crate users;
+
+
+use std::path::PathBuf;
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "rust-footswitch")]
+struct Opt {
+    /// Read all pedals
+    #[structopt(short = "r", long = "read")]
+    read: bool,
+    
+    /// Prints a table of all keys with <listkeys> rows
+    #[structopt(short = "l", long = "listkeys")]
+    listkeys: usize,
+
+    /// Select pedal (left: 1, middle: 2, right: 3)
+    #[structopt(short = "p", long = "pedal", parse(from_os_str))]
+    output: Option<PathBuf>,
 }
+
+
+fn main() {
+    check_sudo();
+
+    let opt = Opt::from_args();
+
+    let vld_dev = [
+        (0x0c45u16, 0x7403u16),
+        (0x0c45   , 0x7404),
+        (0x413d   , 0x2107)
+    ];
+
+
+
+//    let api = hidapi::HidApi::new().expect("Hidapi init failed!");
+//    let mut dev_path = String::new();
+//
+//    for device in &api.devices() {
+//        //println!("{}:{}, {}, {}", device.vendor_id, device.product_id, device.interface_number, device.path);
+//        for val in vld_dev.iter() {
+//            if *val == (device.vendor_id, device.product_id) && device.interface_number == 1 {
+//                println!("Found device {:x}:{:x} ({})", device.vendor_id, device.product_id, device.path);
+//                dev_path = device.path.clone();
+//            }
+//        }
+//    }
+//    
+//
+//    let dev = api.open_path(dev_path.as_str()).unwrap();
+//    println!("Succesfully opened device.");
+//
+//    //ToDo: Replace by match
+//    if opt.read == true {
+//        // Read data from device
+//        read_pedals(& dev);
+//    }
+
+    if opt.listkeys > 0 {
+        println!("{:?}", opt.listkeys);
+        key_operations::print_key_map(opt.listkeys);
+    }
+}
+
+/// Checks if user is super user
+fn check_sudo() {
+    if users::get_current_uid() != 0 {
+        panic!("Please execute this application as super user!");
+    }
+}
+
+/// Read the current values of the pedals
+fn read_pedals(dev: & hidapi::HidDevice) {
+    let query = [0x01u8, 0x82, 0x08, 0x01, 0x00, 0x00, 0x00, 0x00];
+    println!("{:?}", query);
+
+    let res = dev.write(&query).expect("test");
+    println!("Wrote: {:?} byte(s)", res);
+
+    let mut buf = [0u8; 8];
+
+    let res = dev.read(&mut buf[..]).unwrap();
+    println!("Read: {:?}", &buf[..res]);
+}
+