Remove warnings from example

examples/simple.rs

@@ -4,14 +4,15 @@ use libterm::{TermControl, raw_mode};
 use std::io::{Read, Write, stdout, stdin};
 
 fn main() {
-    let raw = raw_mode();
+    let _raw = raw_mode();
     let mut stdout = stdout();
-    let mut stdin = stdin();
+    let stdin = stdin();
 
-    stdout.goto(5, 5);
+    stdout.goto(5, 5).unwrap();
-    stdout.clear();
+    stdout.clear().unwrap();
-    stdout.write(b"yo, 'q' will exit.");
+    stdout.write(b"yo, 'q' will exit.").unwrap();
-    stdout.flush();
+    stdout.flush().unwrap();
+    stdout.goto(20, 10).unwrap();
 
     let mut bytes = stdin.bytes();
     loop {
@@ -20,9 +21,10 @@ fn main() {
         match b {
             b'q' => return,
             b'c' => stdout.clear(),
+            b'r' => stdout.rendition(91),
             a => stdout.write(&[a]),
-        };
+        }.unwrap();
 
-        stdout.flush();
+        stdout.flush().unwrap();
     }
 }

src/control.rs

@@ -27,12 +27,19 @@ pub trait TermControl {
     /// Go to a given position.
     fn goto(&mut self, x: u16, y: u16) -> IoResult<usize> {
         self.csi(&[
-             (x / 10000 % 10) as u8, (x / 1000 % 10) as u8, (x / 100 % 10) as u8, (x / 10 % 10) as u8, (x % 10) as u8,
+             (x / 10000) as u8 + b'0', ((x / 1000) % 10) as u8 + b'0', ((x / 100) % 10) as u8 + b'0', ((x / 10) % 10) as u8 + b'0', (x % 10) as u8 + b'0',
              b';',
-             (y / 10000 % 10) as u8, (y / 1000 % 10) as u8, (y / 100 % 10) as u8, (y / 10 % 10) as u8, (y % 10) as u8,
+             (y / 10000) as u8 + b'0', ((y / 1000) % 10) as u8 + b'0', ((y / 100) % 10) as u8 + b'0', ((y / 10) % 10) as u8 + b'0', (y % 10) as u8 + b'0',
              b'H',
         ])
     }
+    /// Set graphic rendition.
+    fn rendition(&mut self, r: u8) -> IoResult<usize> {
+        self.csi(&[
+             r / 100 + b'0', r / 10 % 10 + b'0', r % 10 + b'0',
+             b'm',
+        ])
+    }
 }
 
 impl<W: Write> TermControl for W {