75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
// +build windows
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package uilive
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import (
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"fmt"
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"strings"
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"syscall"
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"unsafe"
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"github.com/mattn/go-isatty"
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)
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var kernel32 = syscall.NewLazyDLL("kernel32.dll")
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var (
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procGetConsoleScreenBufferInfo = kernel32.NewProc("GetConsoleScreenBufferInfo")
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procSetConsoleCursorPosition = kernel32.NewProc("SetConsoleCursorPosition")
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procFillConsoleOutputCharacter = kernel32.NewProc("FillConsoleOutputCharacterW")
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)
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// clear the line and move the cursor up
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var clear = fmt.Sprintf("%c[%dA%c[2K\r", ESC, 0, ESC)
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type short int16
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type dword uint32
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type word uint16
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type coord struct {
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x short
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y short
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}
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type smallRect struct {
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left short
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top short
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right short
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bottom short
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}
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type consoleScreenBufferInfo struct {
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size coord
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cursorPosition coord
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attributes word
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window smallRect
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maximumWindowSize coord
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}
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func (w *Writer) clearLines() {
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f, ok := w.Out.(FdWriter)
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if ok && !isatty.IsTerminal(f.Fd()) {
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ok = false
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}
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if !ok {
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_, _ = fmt.Fprint(w.Out, strings.Repeat(clear, w.lineCount))
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return
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}
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fd := f.Fd()
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var csbi consoleScreenBufferInfo
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_, _, _ = procGetConsoleScreenBufferInfo.Call(fd, uintptr(unsafe.Pointer(&csbi)))
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for i := 0; i < w.lineCount; i++ {
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// move the cursor up
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csbi.cursorPosition.y--
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_, _, _ = procSetConsoleCursorPosition.Call(fd, uintptr(*(*int32)(unsafe.Pointer(&csbi.cursorPosition))))
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// clear the line
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cursor := coord{
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x: csbi.window.left,
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y: csbi.window.top + csbi.cursorPosition.y,
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}
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var count, w dword
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count = dword(csbi.size.x)
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_, _, _ = procFillConsoleOutputCharacter.Call(fd, uintptr(' '), uintptr(count), *(*uintptr)(unsafe.Pointer(&cursor)), uintptr(unsafe.Pointer(&w)))
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}
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}
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