Runtime removal: refactor tty

This patch continues runtime removal by moving the tty implementations
into `sys`.

Because this eliminates APIs in `libnative` and `librustrt`, it is a:

[breaking-change]

This functionality is likely to be available publicly, in some form,
from `std` in the future.

3 files changed, 48 insertions, 19 deletions

diff --git a/src/libstd/sys/unix/fs.rs b/src/libstd/sys/unix/fs.rs
index 3dcd99859e8..2d02c34e958 100644
--- a/src/libstd/sys/unix/fs.rs
+++ b/src/libstd/sys/unix/fs.rs
@@ -137,25 +137,6 @@ impl FileDesc {
     }
 }
 
-/*
-
-impl RtioTTY for FileDesc {
-    fn read(&mut self, buf: &mut [u8]) -> IoResult<uint> {
-        self.inner_read(buf)
-    }
-    fn write(&mut self, buf: &[u8]) -> IoResult<()> {
-        self.inner_write(buf)
-    }
-    fn set_raw(&mut self, _raw: bool) -> IoResult<()> {
-        Err(super::unimpl())
-    }
-    fn get_winsize(&mut self) -> IoResult<(int, int)> {
-        Err(super::unimpl())
-    }
-    fn isatty(&self) -> bool { false }
-}
-*/
-
 impl Drop for FileDesc {
     fn drop(&mut self) {
         // closing stdio file handles makes no sense, so never do it. Also, note
diff --git a/src/libstd/sys/unix/mod.rs b/src/libstd/sys/unix/mod.rs
index 03a4e56f00d..4bd1dd20163 100644
--- a/src/libstd/sys/unix/mod.rs
+++ b/src/libstd/sys/unix/mod.rs
@@ -35,6 +35,7 @@ pub mod pipe;
 pub mod helper_signal;
 pub mod process;
 pub mod timer;
+pub mod tty;
 
 pub mod addrinfo {
     pub use sys_common::net::get_host_addresses;
diff --git a/src/libstd/sys/unix/tty.rs b/src/libstd/sys/unix/tty.rs
new file mode 100644
index 00000000000..28c17fd4966
--- /dev/null
+++ b/src/libstd/sys/unix/tty.rs
@@ -0,0 +1,47 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use sys::fs::FileDesc;
+use prelude::*;
+use libc::{mod, c_int};
+use io::{mod, IoResult, IoError};
+use sys_common;
+
+pub struct TTY {
+    pub fd: FileDesc,
+}
+
+impl TTY {
+    pub fn new(fd: c_int) -> IoResult<TTY> {
+        if unsafe { libc::isatty(fd) } != 0 {
+            Ok(TTY { fd: FileDesc::new(fd, true) })
+        } else {
+            Err(IoError {
+                kind: io::MismatchedFileTypeForOperation,
+                desc: "file descriptor is not a TTY",
+                detail: None,
+            })
+        }
+    }
+
+    pub fn read(&mut self, buf: &mut [u8]) -> IoResult<uint> {
+        self.fd.read(buf)
+    }
+    pub fn write(&mut self, buf: &[u8]) -> IoResult<()> {
+        self.fd.write(buf)
+    }
+    pub fn set_raw(&mut self, _raw: bool) -> IoResult<()> {
+        Err(sys_common::unimpl())
+    }
+    pub fn get_winsize(&mut self) -> IoResult<(int, int)> {
+        Err(sys_common::unimpl())
+    }
+    pub fn isatty(&self) -> bool { false }
+}