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74 lines
2.1 KiB
Go
74 lines
2.1 KiB
Go
// +build windows
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package cwriter
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import (
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"unsafe"
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"golang.org/x/sys/windows"
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)
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var kernel32 = windows.NewLazySystemDLL("kernel32.dll")
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var (
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procSetConsoleCursorPosition = kernel32.NewProc("SetConsoleCursorPosition")
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procFillConsoleOutputCharacter = kernel32.NewProc("FillConsoleOutputCharacterW")
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)
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func (w *Writer) clearLines() error {
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if !w.isTerminal {
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// hope it's cygwin or similar
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return w.ansiCuuAndEd()
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}
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var info windows.ConsoleScreenBufferInfo
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if err := windows.GetConsoleScreenBufferInfo(windows.Handle(w.fd), &info); err != nil {
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return err
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}
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info.CursorPosition.Y -= int16(w.lineCount)
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if info.CursorPosition.Y < 0 {
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info.CursorPosition.Y = 0
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}
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_, _, _ = procSetConsoleCursorPosition.Call(
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uintptr(w.fd),
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uintptr(uint32(uint16(info.CursorPosition.Y))<<16|uint32(uint16(info.CursorPosition.X))),
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)
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// clear the lines
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cursor := &windows.Coord{
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X: info.Window.Left,
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Y: info.CursorPosition.Y,
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}
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count := uint32(info.Size.X) * uint32(w.lineCount)
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_, _, _ = procFillConsoleOutputCharacter.Call(
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uintptr(w.fd),
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uintptr(' '),
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uintptr(count),
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*(*uintptr)(unsafe.Pointer(cursor)),
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uintptr(unsafe.Pointer(new(uint32))),
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)
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return nil
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}
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// GetSize returns the visible dimensions of the given terminal.
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//
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// These dimensions don't include any scrollback buffer height.
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func GetSize(fd int) (width, height int, err error) {
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var info windows.ConsoleScreenBufferInfo
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if err := windows.GetConsoleScreenBufferInfo(windows.Handle(fd), &info); err != nil {
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return 0, 0, err
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}
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// terminal.GetSize from crypto/ssh adds "+ 1" to both width and height:
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// https://go.googlesource.com/crypto/+/refs/heads/release-branch.go1.14/ssh/terminal/util_windows.go#75
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// but looks like this is a root cause of issue #66, so removing both "+ 1" have fixed it.
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return int(info.Window.Right - info.Window.Left), int(info.Window.Bottom - info.Window.Top), nil
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}
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// IsTerminal returns whether the given file descriptor is a terminal.
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func IsTerminal(fd int) bool {
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var st uint32
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err := windows.GetConsoleMode(windows.Handle(fd), &st)
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return err == nil
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}
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