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Restore original terminal colors after error messages on Windows.

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This commit is contained in:
Vadim Chugunov 2014-09-20 15:22:11 -07:00
parent 5d335c94bd
commit b11c5722f8
1 changed files with 51 additions and 3 deletions
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54
src/libterm/win.rs
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@ -23,15 +23,29 @@ use Terminal;
/// A Terminal implementation which uses the Win32 Console API.
pub struct WinConsole<T> {
buf: T,
def_foreground: color::Color,
def_background: color::Color,
foreground: color::Color,
background: color::Color,
}
#[allow(non_snake_case)]
#[repr(C)]
struct CONSOLE_SCREEN_BUFFER_INFO {
dwSize: [libc::c_short, ..2],
dwCursorPosition: [libc::c_short, ..2],
wAttributes: libc::WORD,
srWindow: [libc::c_short, ..4],
dwMaximumWindowSize: [libc::c_short, ..2],
}
#[allow(non_snake_case)]
#[link(name = "kernel32")]
extern "system" {
fn SetConsoleTextAttribute(handle: libc::HANDLE, attr: libc::WORD) -> libc::BOOL;
fn GetStdHandle(which: libc::DWORD) -> libc::HANDLE;
fn GetConsoleScreenBufferInfo(handle: libc::HANDLE,
info: *mut CONSOLE_SCREEN_BUFFER_INFO) -> libc::BOOL;
}
fn color_to_bits(color: color::Color) -> u16 {
@ -56,6 +70,26 @@ fn color_to_bits(color: color::Color) -> u16 {
}
}
fn bits_to_color(bits: u16) -> color::Color {
let color = match bits & 0x7 {
0 => color::BLACK,
0x1 => color::BLUE,
0x2 => color::GREEN,
0x4 => color::RED,
0x6 => color::YELLOW,
0x5 => color::MAGENTA,
0x3 => color::CYAN,
0x7 => color::WHITE,
_ => unreachable!()
};
if bits >= 8 {
color | 0x8
} else {
color
}
}
impl<T: Writer> WinConsole<T> {
fn apply(&mut self) {
let _unused = self.buf.flush();
@ -91,7 +125,21 @@ impl<T: Writer> Writer for WinConsole<T> {
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 })
let fg;
let bg;
unsafe {
let mut buffer_info = ::std::mem::uninitialized();
if GetConsoleScreenBufferInfo(GetStdHandle(-11), &mut buffer_info) != 0 {
fg = bits_to_color(buffer_info.wAttributes);
bg = bits_to_color(buffer_info.wAttributes >> 4);
} else {
fg = color::WHITE;
bg = color::BLACK;
}
}
Some(WinConsole { buf: out,
def_foreground: fg, def_background: bg,
foreground: fg, background: bg } )
}
fn fg(&mut self, color: color::Color) -> IoResult<bool> {
@ -134,8 +182,8 @@ impl<T: Writer> Terminal<T> for WinConsole<T> {
}
fn reset(&mut self) -> IoResult<()> {
self.foreground = color::WHITE;
self.background = color::BLACK;
self.foreground = self.def_foreground;
self.background = self.def_background;
self.apply();
Ok(())