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|
//! Windows console handling
// FIXME (#13400): this is only a tiny fraction of the Windows console api
use std::io;
use std::io::prelude::*;
use super::color;
use super::Terminal;
/// A Terminal implementation that uses the Win32 Console API.
pub(crate) struct WinConsole<T> {
buf: T,
def_foreground: color::Color,
def_background: color::Color,
foreground: color::Color,
background: color::Color,
}
type SHORT = i16;
type WORD = u16;
type DWORD = u32;
type BOOL = i32;
type HANDLE = *mut u8;
#[allow(non_snake_case)]
#[repr(C)]
struct SMALL_RECT {
Left: SHORT,
Top: SHORT,
Right: SHORT,
Bottom: SHORT,
}
#[allow(non_snake_case)]
#[repr(C)]
struct COORD {
X: SHORT,
Y: SHORT,
}
#[allow(non_snake_case)]
#[repr(C)]
struct CONSOLE_SCREEN_BUFFER_INFO {
dwSize: COORD,
dwCursorPosition: COORD,
wAttributes: WORD,
srWindow: SMALL_RECT,
dwMaximumWindowSize: COORD,
}
#[allow(non_snake_case)]
#[link(name = "kernel32")]
extern "system" {
fn SetConsoleTextAttribute(handle: HANDLE, attr: WORD) -> BOOL;
fn GetStdHandle(which: DWORD) -> HANDLE;
fn GetConsoleScreenBufferInfo(handle: HANDLE, info: *mut CONSOLE_SCREEN_BUFFER_INFO) -> BOOL;
}
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 }
}
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 | (u32::from(bits) & 0x8) // copy the hi-intensity bit
}
impl<T: Write + Send + 'static> WinConsole<T> {
fn apply(&mut self) {
let _unused = self.buf.flush();
let mut accum: WORD = 0;
accum |= color_to_bits(self.foreground);
accum |= color_to_bits(self.background) << 4;
unsafe {
// Magic -11 means stdout, from
// https://docs.microsoft.com/en-us/windows/console/getstdhandle
//
// 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(-11i32 as DWORD);
SetConsoleTextAttribute(out, accum);
}
}
/// Returns `None` whenever the terminal cannot be created for some reason.
pub(crate) fn new(out: T) -> io::Result<WinConsole<T>> {
use std::mem::MaybeUninit;
let fg;
let bg;
unsafe {
let mut buffer_info = MaybeUninit::<CONSOLE_SCREEN_BUFFER_INFO>::uninit();
if GetConsoleScreenBufferInfo(GetStdHandle(-11i32 as DWORD), buffer_info.as_mut_ptr())
!= 0
{
let buffer_info = buffer_info.assume_init();
fg = bits_to_color(buffer_info.wAttributes);
bg = bits_to_color(buffer_info.wAttributes >> 4);
} else {
fg = color::WHITE;
bg = color::BLACK;
}
}
Ok(WinConsole {
buf: out,
def_foreground: fg,
def_background: bg,
foreground: fg,
background: bg,
})
}
}
impl<T: Write> Write for WinConsole<T> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.buf.write(buf)
}
fn flush(&mut self) -> io::Result<()> {
self.buf.flush()
}
}
impl<T: Write + Send + 'static> Terminal for WinConsole<T> {
fn fg(&mut self, color: color::Color) -> io::Result<bool> {
self.foreground = color;
self.apply();
Ok(true)
}
fn reset(&mut self) -> io::Result<bool> {
self.foreground = self.def_foreground;
self.background = self.def_background;
self.apply();
Ok(true)
}
}
|
