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// +build windows
package cwriter
import (
"fmt"
"syscall"
"unsafe"
)
var kernel32 = syscall.NewLazyDLL("kernel32.dll")
var (
procGetConsoleScreenBufferInfo = kernel32.NewProc("GetConsoleScreenBufferInfo")
procSetConsoleCursorPosition = kernel32.NewProc("SetConsoleCursorPosition")
procFillConsoleOutputCharacter = kernel32.NewProc("FillConsoleOutputCharacterW")
)
type coord struct {
x int16
y int16
}
type smallRect struct {
left int16
top int16
right int16
bottom int16
}
type consoleScreenBufferInfo struct {
size coord
cursorPosition coord
attributes uint16
window smallRect
maximumWindowSize coord
}
func (w *Writer) clearLines() {
if !w.isTerminal {
fmt.Fprintf(w.out, cuuAndEd, w.lineCount)
}
info := new(consoleScreenBufferInfo)
procGetConsoleScreenBufferInfo.Call(w.fd, uintptr(unsafe.Pointer(info)))
info.cursorPosition.y -= int16(w.lineCount)
if info.cursorPosition.y < 0 {
info.cursorPosition.y = 0
}
procSetConsoleCursorPosition.Call(w.fd, uintptr(uint32(uint16(info.cursorPosition.y))<<16|uint32(uint16(info.cursorPosition.x))))
// clear the lines
cursor := &coord{
x: info.window.left,
y: info.cursorPosition.y,
}
count := uint32(info.size.x) * uint32(w.lineCount)
procFillConsoleOutputCharacter.Call(w.fd, uintptr(' '), uintptr(count), *(*uintptr)(unsafe.Pointer(cursor)), uintptr(unsafe.Pointer(new(uint32))))
}
// GetSize returns the visible dimensions of the given terminal.
//
// These dimensions don't include any scrollback buffer height.
func GetSize(fd uintptr) (width, height int, err error) {
info := new(consoleScreenBufferInfo)
procGetConsoleScreenBufferInfo.Call(fd, uintptr(unsafe.Pointer(info)))
return int(info.window.right - info.window.left), int(info.window.bottom - info.window.top), nil
}
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