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// Copyright 2013-2014 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.
//! Windows console handling
// FIXME (#13400): this is only a tiny fraction of the win32 console api
extern crate libc;
use std::io::IoResult;
use attr;
use color;
use Terminal;
/// A Terminal implementation which uses the Win32 Console API.
pub struct WinConsole<T> {
buf: T,
foreground: color::Color,
background: color::Color,
}
#[allow(non_snake_case_functions)]
#[link(name = "kernel32")]
extern "system" {
fn SetConsoleTextAttribute(handle: libc::HANDLE, attr: libc::WORD) -> libc::BOOL;
fn GetStdHandle(which: libc::DWORD) -> libc::HANDLE;
}
fn color_to_bits(color: color::Color) -> u16 {
// magic numbers from mingw-w64's wincon.h
let bits = match color % 8 {
color::BLACK => 0,
color::BLUE => 0x1,
color::GREEN => 0x2,
color::RED => 0x4,
color::YELLOW => 0x2 | 0x4,
color::MAGENTA => 0x1 | 0x4,
color::CYAN => 0x1 | 0x2,
color::WHITE => 0x1 | 0x2 | 0x4,
_ => unreachable!()
};
if color >= 8 {
bits | 0x8
} else {
bits
}
}
impl<T: Writer> WinConsole<T> {
fn apply(&mut self) {
let _unused = self.buf.flush();
let mut accum: libc::WORD = 0;
accum |= color_to_bits(self.foreground);
accum |= color_to_bits(self.background) << 4;
unsafe {
// Magic -11 means stdout, from
// http://msdn.microsoft.com/en-us/library/windows/desktop/ms683231%28v=vs.85%29.aspx
//
// You may be wondering, "but what about stderr?", and the answer
// to that is that setting terminal attributes on the stdout
// handle also sets them for stderr, since they go to the same
// terminal! Admittedly, this is fragile, since stderr could be
// redirected to a different console. This is good enough for
// rustc though. See #13400.
let out = GetStdHandle(-11);
SetConsoleTextAttribute(out, accum);
}
}
}
impl<T: Writer> Writer for WinConsole<T> {
fn write(&mut self, buf: &[u8]) -> IoResult<()> {
self.buf.write(buf)
}
fn flush(&mut self) -> IoResult<()> {
self.buf.flush()
}
}
impl<T: Writer> Terminal<T> for WinConsole<T> {
fn new(out: T) -> Option<WinConsole<T>> {
Some(WinConsole { buf: out, foreground: color::WHITE, background: color::BLACK })
}
fn fg(&mut self, color: color::Color) -> IoResult<bool> {
self.foreground = color;
self.apply();
Ok(true)
}
fn bg(&mut self, color: color::Color) -> IoResult<bool> {
self.background = color;
self.apply();
Ok(true)
}
fn attr(&mut self, attr: attr::Attr) -> IoResult<bool> {
match attr {
attr::ForegroundColor(f) => {
self.foreground = f;
self.apply();
Ok(true)
},
attr::BackgroundColor(b) => {
self.background = b;
self.apply();
Ok(true)
},
_ => Ok(false)
}
}
fn supports_attr(&self, attr: attr::Attr) -> bool {
// it claims support for underscore and reverse video, but I can't get
// it to do anything -cmr
match attr {
attr::ForegroundColor(_) | attr::BackgroundColor(_) => true,
_ => false
}
}
fn reset(&mut self) -> IoResult<()> {
self.foreground = color::WHITE;
self.background = color::BLACK;
self.apply();
Ok(())
}
fn unwrap(self) -> T { self.buf }
fn get_ref<'a>(&'a self) -> &'a T { &self.buf }
fn get_mut<'a>(&'a mut self) -> &'a mut T { &mut self.buf }
}
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