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extern crate libc;
use std::io::IoResult;
use attr;
use color;
use {Terminal,UnwrappableTerminal};
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 {
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
}
}
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!()
};
color | (bits & 0x8)
}
impl<T: Writer+Send> 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 {
let out = GetStdHandle(-11);
SetConsoleTextAttribute(out, accum);
}
}
pub fn new(out: T) -> Option<Box<Terminal<T>+Send+'static>> {
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(box WinConsole { buf: out,
def_foreground: fg, def_background: bg,
foreground: fg, background: bg } as Box<Terminal<T>+Send>)
}
}
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+Send> Terminal<T> for WinConsole<T> {
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 {
match attr {
attr::ForegroundColor(_) | attr::BackgroundColor(_) => true,
_ => false
}
}
fn reset(&mut self) -> IoResult<()> {
self.foreground = self.def_foreground;
self.background = self.def_background;
self.apply();
Ok(())
}
fn get_ref<'a>(&'a self) -> &'a T { &self.buf }
fn get_mut<'a>(&'a mut self) -> &'a mut T { &mut self.buf }
}
impl<T: Writer+Send> UnwrappableTerminal<T> for WinConsole<T> {
fn unwrap(self) -> T { self.buf }
}