150 lines
4.1 KiB
Rust
150 lines
4.1 KiB
Rust
// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Windows console handling
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// FIXME (#13400): this is only a tiny fraction of the Windows console api
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extern crate libc;
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use std::io::IoResult;
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use attr;
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use color;
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use Terminal;
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/// A Terminal implementation which uses the Win32 Console API.
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pub struct WinConsole<T> {
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buf: T,
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foreground: color::Color,
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background: color::Color,
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}
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#[allow(non_snake_case_functions)]
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#[link(name = "kernel32")]
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extern "system" {
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fn SetConsoleTextAttribute(handle: libc::HANDLE, attr: libc::WORD) -> libc::BOOL;
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fn GetStdHandle(which: libc::DWORD) -> libc::HANDLE;
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}
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fn color_to_bits(color: color::Color) -> u16 {
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// magic numbers from mingw-w64's wincon.h
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let bits = match color % 8 {
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color::BLACK => 0,
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color::BLUE => 0x1,
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color::GREEN => 0x2,
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color::RED => 0x4,
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color::YELLOW => 0x2 | 0x4,
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color::MAGENTA => 0x1 | 0x4,
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color::CYAN => 0x1 | 0x2,
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color::WHITE => 0x1 | 0x2 | 0x4,
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_ => unreachable!()
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};
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if color >= 8 {
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bits | 0x8
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} else {
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bits
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}
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}
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impl<T: Writer> WinConsole<T> {
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fn apply(&mut self) {
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let _unused = self.buf.flush();
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let mut accum: libc::WORD = 0;
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accum |= color_to_bits(self.foreground);
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accum |= color_to_bits(self.background) << 4;
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unsafe {
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// Magic -11 means stdout, from
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// http://msdn.microsoft.com/en-us/library/windows/desktop/ms683231%28v=vs.85%29.aspx
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//
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// You may be wondering, "but what about stderr?", and the answer
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// to that is that setting terminal attributes on the stdout
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// handle also sets them for stderr, since they go to the same
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// terminal! Admittedly, this is fragile, since stderr could be
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// redirected to a different console. This is good enough for
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// rustc though. See #13400.
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let out = GetStdHandle(-11);
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SetConsoleTextAttribute(out, accum);
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}
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}
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}
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impl<T: Writer> Writer for WinConsole<T> {
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fn write(&mut self, buf: &[u8]) -> IoResult<()> {
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self.buf.write(buf)
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}
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fn flush(&mut self) -> IoResult<()> {
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self.buf.flush()
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}
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}
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impl<T: Writer> Terminal<T> for WinConsole<T> {
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fn new(out: T) -> Option<WinConsole<T>> {
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Some(WinConsole { buf: out, foreground: color::WHITE, background: color::BLACK })
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}
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fn fg(&mut self, color: color::Color) -> IoResult<bool> {
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self.foreground = color;
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self.apply();
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Ok(true)
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}
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fn bg(&mut self, color: color::Color) -> IoResult<bool> {
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self.background = color;
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self.apply();
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Ok(true)
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}
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fn attr(&mut self, attr: attr::Attr) -> IoResult<bool> {
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match attr {
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attr::ForegroundColor(f) => {
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self.foreground = f;
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self.apply();
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Ok(true)
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},
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attr::BackgroundColor(b) => {
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self.background = b;
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self.apply();
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Ok(true)
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},
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_ => Ok(false)
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}
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}
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fn supports_attr(&self, attr: attr::Attr) -> bool {
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// it claims support for underscore and reverse video, but I can't get
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// it to do anything -cmr
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match attr {
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attr::ForegroundColor(_) | attr::BackgroundColor(_) => true,
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_ => false
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}
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}
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fn reset(&mut self) -> IoResult<()> {
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self.foreground = color::WHITE;
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self.background = color::BLACK;
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self.apply();
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Ok(())
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}
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fn unwrap(self) -> T { self.buf }
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fn get_ref<'a>(&'a self) -> &'a T { &self.buf }
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fn get_mut<'a>(&'a mut self) -> &'a mut T { &mut self.buf }
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}
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