Redox OS support

Cargo.toml

@@ -14,5 +14,8 @@ time = "0.1.35"
 winapi = "0.2"
 kernel32-sys = "0.2"
 
+[target.'cfg(target_os = "redox")'.dependencies]
+termion = "1.4"
+
 [dev-dependencies]
 rand = "0.3.14"

src/tty/mod.rs

@@ -21,3 +21,8 @@ pub use self::unix::*;
 mod windows;
 #[cfg(windows)]
 pub use self::windows::*;
+
+#[cfg(target_os = "redox")]
+mod redox;
+#[cfg(target_os = "redox")]
+pub use self::redox::*;

src/tty/redox.rs

@@ -0,0 +1,13 @@
+extern crate termion;
+use super::{Width, Height};
+
+pub fn terminal_size() -> Option<(Width, Height)> {
+    match termion::terminal_size() {
+        Ok((cols, rows)) => Some((Width(cols), Height(rows))),
+        Err(..) => None
+    }
+}
+
+pub fn move_cursor_up(n: usize) -> String {
+    format!("{}", termion::cursor::Up(n as u16))
+}