Run rustfmt and fix warnings

.gitignore

@@ -14,3 +14,6 @@ Cargo.lock
 
 # Intellij IDEA
 .idea
+
+# macOS DS_Store files
+.DS_Store

examples/blinky.rs

@@ -8,10 +8,10 @@
 
 extern crate sysfs_gpio;
 
-use sysfs_gpio::{Direction, Pin};
-use std::time::Duration;
-use std::thread::sleep;
 use std::env;
+use std::thread::sleep;
+use std::time::Duration;
+use sysfs_gpio::{Direction, Pin};
 
 struct Arguments {
     pin: u64,
@@ -58,20 +58,18 @@ fn get_args() -> Option<Arguments> {
         Err(_) => return None,
     };
     Some(Arguments {
-             pin: pin,
-             duration_ms: duration_ms,
-             period_ms: period_ms,
-         })
+        pin: pin,
+        duration_ms: duration_ms,
+        period_ms: period_ms,
+    })
 }
 
 fn main() {
     match get_args() {
         None => print_usage(),
-        Some(args) => {
-            match blink_my_led(args.pin, args.duration_ms, args.period_ms) {
-                Ok(()) => println!("Success!"),
-                Err(err) => println!("We have a blinking problem: {}", err),
-            }
-        }
+        Some(args) => match blink_my_led(args.pin, args.duration_ms, args.period_ms) {
+            Ok(()) => println!("Success!"),
+            Err(err) => println!("We have a blinking problem: {}", err),
+        },
     }
 }

examples/interrupt.rs

@@ -8,10 +8,10 @@
 
 extern crate sysfs_gpio;
 
-use sysfs_gpio::{Direction, Edge, Pin};
 use std::env;
 use std::io::prelude::*;
 use std::io::stdout;
+use sysfs_gpio::{Direction, Edge, Pin};
 
 fn interrupt(pin: u64) -> sysfs_gpio::Result<()> {
     let input = Pin::new(pin);
@@ -38,12 +38,10 @@ fn main() {
         println!("Usage: ./interrupt <pin>");
     } else {
         match args[1].parse::<u64>() {
-            Ok(pin) => {
-                match interrupt(pin) {
-                    Ok(()) => println!("Interrupting Complete!"),
-                    Err(err) => println!("Error: {}", err),
-                }
-            }
+            Ok(pin) => match interrupt(pin) {
+                Ok(()) => println!("Interrupting Complete!"),
+                Err(err) => println!("Error: {}", err),
+            },
             Err(_) => println!("Usage: ./interrupt <pin>"),
         }
     }

examples/poll.rs

@@ -8,10 +8,10 @@
 
 extern crate sysfs_gpio;
 
-use sysfs_gpio::{Direction, Pin};
 use std::env;
 use std::thread::sleep;
 use std::time::Duration;
+use sysfs_gpio::{Direction, Pin};
 
 fn poll(pin_num: u64) -> sysfs_gpio::Result<()> {
     // NOTE: this currently runs forever and as such if
@@ -40,12 +40,10 @@ fn main() {
         println!("Usage: ./poll <pin>");
     } else {
         match args[1].parse::<u64>() {
-            Ok(pin) => {
-                match poll(pin) {
-                    Ok(()) => println!("Polling Complete!"),
-                    Err(err) => println!("Error: {}", err),
-                }
-            }
+            Ok(pin) => match poll(pin) {
+                Ok(()) => println!("Polling Complete!"),
+                Err(err) => println!("Error: {}", err),
+            },
             Err(_) => println!("Usage: ./poll <pin>"),
         }
     }

examples/tokio.rs

@@ -9,7 +9,7 @@ extern crate tokio;
 use std::env;
 
 #[cfg(feature = "use_tokio")]
-use futures::{Future, lazy, Stream};
+use futures::{lazy, Future, Stream};
 
 #[cfg(feature = "use_tokio")]
 use sysfs_gpio::{Direction, Edge, Pin};
@@ -27,12 +27,15 @@ fn stream(pin_nums: Vec<u64>) -> sysfs_gpio::Result<()> {
             pin.export().unwrap();
             pin.set_direction(Direction::In).unwrap();
             pin.set_edge(Edge::BothEdges).unwrap();
-            tokio::spawn(pin.get_value_stream().unwrap()
-                .for_each(move |val| {
-                    println!("Pin {} changed value to {}", i, val);
-                    Ok(())
-                })
-                .map_err(|_| ()));
+            tokio::spawn(
+                pin.get_value_stream()
+                    .unwrap()
+                    .for_each(move |val| {
+                        println!("Pin {} changed value to {}", i, val);
+                        Ok(())
+                    })
+                    .map_err(|_| ()),
+            );
         }
         Ok(())
     });

src/error.rs

@@ -1,7 +1,7 @@
+use nix;
 use std::convert;
 use std::fmt;
 use std::io;
-use nix;
 
 #[derive(Debug)]
 pub enum Error {
@@ -25,7 +25,7 @@ impl ::std::error::Error for Error {
         }
     }
 
-    fn cause(&self) -> Option<&::std::error::Error> {
+    fn cause(&self) -> Option<&dyn std::error::Error> {
         match *self {
             Error::Io(ref e) => Some(e),
             _ => None,
@@ -44,7 +44,6 @@ impl fmt::Display for Error {
     }
 }
 
-
 impl convert::From<io::Error> for Error {
     fn from(e: io::Error) -> Error {
         Error::Io(e)