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.

src/libnative/io/mod.rs

@@ -99,30 +99,4 @@ impl IoFactory {
 }
 
 impl rtio::IoFactory for IoFactory {
-    #[cfg(unix)]
-    fn tty_open(&mut self, fd: c_int, _readable: bool)
-                -> IoResult<Box<rtio::RtioTTY + Send>> {
-        if unsafe { libc::isatty(fd) } != 0 {
-            Ok(box file::FileDesc::new(fd, true) as Box<rtio::RtioTTY + Send>)
-        } else {
-            Err(IoError {
-                code: libc::ENOTTY as uint,
-                extra: 0,
-                detail: None,
-            })
-        }
-    }
-    #[cfg(windows)]
-    fn tty_open(&mut self, fd: c_int, _readable: bool)
-                -> IoResult<Box<rtio::RtioTTY + Send>> {
-        if tty::is_tty(fd) {
-            Ok(box tty::WindowsTTY::new(fd) as Box<rtio::RtioTTY + Send>)
-        } else {
-            Err(IoError {
-                code: libc::ERROR_INVALID_HANDLE as uint,
-                extra: 0,
-                detail: None,
-            })
-        }
-    }
 }

src/libstd/io/stdio.rs

@@ -36,7 +36,7 @@ use kinds::Send;
 use libc;
 use option::{Option, Some, None};
 use boxed::Box;
-use sys::fs::FileDesc;
+use sys::{fs, tty};
 use result::{Ok, Err};
 use rt;
 use rt::local::Local;
@@ -74,17 +74,15 @@ use uint;
 // tl;dr; TTY works on everything but when windows stdout is redirected, in that
 //        case pipe also doesn't work, but magically file does!
 enum StdSource {
-    TTY(Box<RtioTTY + Send>),
-    File(FileDesc),
+    TTY(tty::TTY),
+    File(fs::FileDesc),
 }
 
-fn src<T>(fd: libc::c_int, readable: bool, f: |StdSource| -> T) -> T {
-    LocalIo::maybe_raise(|io| {
-        Ok(match io.tty_open(fd, readable) {
-            Ok(tty) => f(TTY(tty)),
-            Err(_) => f(File(FileDesc::new(fd, false))),
-        })
-    }).map_err(IoError::from_rtio_error).unwrap()
+fn src<T>(fd: libc::c_int, _readable: bool, f: |StdSource| -> T) -> T {
+    match tty::TTY::new(fd) {
+        Ok(tty) => f(TTY(tty)),
+        Err(_) => f(File(fs::FileDesc::new(fd, false))),
+    }
 }
 
 local_data_key!(local_stdout: Box<Writer + Send>)
@@ -278,7 +276,7 @@ impl Reader for StdReader {
                 // print!'d prompt not being shown until after the user hits
                 // enter.
                 flush();
-                tty.read(buf).map_err(IoError::from_rtio_error)
+                tty.read(buf).map(|i| i as uint)
             },
             File(ref mut file) => file.read(buf).map(|i| i as uint),
         };
@@ -313,7 +311,7 @@ impl StdWriter {
     pub fn winsize(&mut self) -> IoResult<(int, int)> {
         match self.inner {
             TTY(ref mut tty) => {
-                tty.get_winsize().map_err(IoError::from_rtio_error)
+                tty.get_winsize()
             }
             File(..) => {
                 Err(IoError {
@@ -335,7 +333,7 @@ impl StdWriter {
     pub fn set_raw(&mut self, raw: bool) -> IoResult<()> {
         match self.inner {
             TTY(ref mut tty) => {
-                tty.set_raw(raw).map_err(IoError::from_rtio_error)
+                tty.set_raw(raw)
             }
             File(..) => {
                 Err(IoError {
@@ -372,7 +370,7 @@ impl Writer for StdWriter {
         let max_size = if cfg!(windows) {8192} else {uint::MAX};
         for chunk in buf.chunks(max_size) {
             try!(match self.inner {
-                TTY(ref mut tty) => tty.write(chunk).map_err(IoError::from_rtio_error),
+                TTY(ref mut tty) => tty.write(chunk),
                 File(ref mut file) => file.write(chunk),
             })
         }

src/libstd/sys/common/mod.rs

@@ -48,6 +48,14 @@ pub fn short_write(n: uint, desc: &'static str) -> IoError {
     }
 }
 
+pub fn unimpl() -> IoError {
+    IoError {
+        kind: io::IoUnavailable,
+        desc: "operations not yet supported",
+        detail: None,
+    }
+}
+
 // unix has nonzero values as errors
 pub fn mkerr_libc<Int: num::Zero>(ret: Int) -> IoResult<()> {
     if !ret.is_zero() {

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

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;

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 }
+}

src/libstd/sys/windows/mod.rs

@@ -42,6 +42,7 @@ 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;

src/libstd/sys/windows/tty.rs

@@ -33,16 +33,16 @@ use super::c::{ENABLE_PROCESSED_INPUT, ENABLE_QUICK_EDIT_MODE};
 use libc::{c_int, HANDLE, LPDWORD, DWORD, LPVOID};
 use libc::{get_osfhandle, CloseHandle};
 use libc::types::os::arch::extra::LPCVOID;
-use std::io::MemReader;
-use std::ptr;
-use std::rt::rtio::{IoResult, IoError, RtioTTY};
-use std::str::from_utf8;
+use io::{mod, IoError, IoResult, MemReader};
+use prelude::*;
+use ptr;
+use str::from_utf8;
 
 fn invalid_encoding() -> IoError {
     IoError {
-        code: ERROR_ILLEGAL_CHARACTER as uint,
-        extra: 0,
-        detail: Some("text was not valid unicode".to_string()),
+        kind: io::InvalidInput,
+        desc: "text was not valid unicode",
+        detail: None,
     }
 }
 
@@ -56,40 +56,37 @@ pub fn is_tty(fd: c_int) -> bool {
     }
 }
 
-pub struct WindowsTTY {
+pub struct TTY {
     closeme: bool,
     handle: HANDLE,
     utf8: MemReader,
 }
 
-impl WindowsTTY {
-    pub fn new(fd: c_int) -> WindowsTTY {
-        // If the file descriptor is one of stdin, stderr, or stdout
-        // then it should not be closed by us
-        let closeme = match fd {
-            0...2 => false,
-            _ => true,
-        };
-        let handle = unsafe { get_osfhandle(fd) as HANDLE };
-        WindowsTTY {
-            handle: handle,
-            utf8: MemReader::new(Vec::new()),
-            closeme: closeme,
+impl TTY {
+    pub fn new(fd: c_int) -> IoResult<TTY> {
+        if is_tty(fd) {
+            // If the file descriptor is one of stdin, stderr, or stdout
+            // then it should not be closed by us
+            let closeme = match fd {
+                0...2 => false,
+                _ => true,
+            };
+            let handle = unsafe { get_osfhandle(fd) as HANDLE };
+            Ok(TTY {
+                handle: handle,
+                utf8: MemReader::new(Vec::new()),
+                closeme: closeme,
+            })
+        } else {
+            Err(IoError {
+                kind: io::MismatchedFileTypeForOperation,
+                desc: "invalid handle provided to function",
+                detail: None,
+            })
         }
     }
-}
 
-impl Drop for WindowsTTY {
-    fn drop(&mut self) {
-        if self.closeme {
-            // Nobody cares about the return value
-            let _ = unsafe { CloseHandle(self.handle) };
-        }
-    }
-}
-
-impl RtioTTY for WindowsTTY {
-    fn read(&mut self, buf: &mut [u8]) -> IoResult<uint> {
+    pub fn read(&mut self, buf: &mut [u8]) -> IoResult<uint> {
         // Read more if the buffer is empty
         if self.utf8.eof() {
             let mut utf16 = Vec::from_elem(0x1000, 0u16);
@@ -113,7 +110,7 @@ impl RtioTTY for WindowsTTY {
         Ok(self.utf8.read(buf).unwrap())
     }
 
-    fn write(&mut self, buf: &[u8]) -> IoResult<()> {
+    pub fn write(&mut self, buf: &[u8]) -> IoResult<()> {
         let utf16 = match from_utf8(buf) {
             Some(utf8) => {
                 utf8.as_slice().utf16_units().collect::<Vec<u16>>()
@@ -131,7 +128,7 @@ impl RtioTTY for WindowsTTY {
         }
     }
 
-    fn set_raw(&mut self, raw: bool) -> IoResult<()> {
+    pub fn set_raw(&mut self, raw: bool) -> IoResult<()> {
         // FIXME
         // Somebody needs to decide on which of these flags we want
         match unsafe { SetConsoleMode(self.handle,
@@ -146,7 +143,7 @@ impl RtioTTY for WindowsTTY {
         }
     }
 
-    fn get_winsize(&mut self) -> IoResult<(int, int)> {
+    pub fn get_winsize(&mut self) -> IoResult<(int, int)> {
         // FIXME
         // Get console buffer via CreateFile with CONOUT$
         // Make a CONSOLE_SCREEN_BUFFER_INFO
@@ -156,5 +153,14 @@ impl RtioTTY for WindowsTTY {
     }
 
     // Let us magically declare this as a TTY
-    fn isatty(&self) -> bool { true }
+    pub fn isatty(&self) -> bool { true }
+}
+
+impl Drop for TTY {
+    fn drop(&mut self) {
+        if self.closeme {
+            // Nobody cares about the return value
+            let _ = unsafe { CloseHandle(self.handle) };
+        }
+    }
 }