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restic/internal/ui/termstatus/terminal_windows.go

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2018-04-22 09:57:11 +00:00
// +build windows
package termstatus
import (
"io"
"syscall"
"unsafe"
"golang.org/x/crypto/ssh/terminal"
"golang.org/x/sys/windows"
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)
// clearCurrentLine removes all characters from the current line and resets the
// cursor position to the first column.
func clearCurrentLine(wr io.Writer, fd uintptr) func(io.Writer, uintptr) {
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// easy case, the terminal is cmd or psh, without redirection
if isWindowsTerminal(fd) {
return windowsClearCurrentLine
}
// assume we're running in mintty/cygwin
return posixClearCurrentLine
}
// moveCursorUp moves the cursor to the line n lines above the current one.
func moveCursorUp(wr io.Writer, fd uintptr) func(io.Writer, uintptr, int) {
// easy case, the terminal is cmd or psh, without redirection
if isWindowsTerminal(fd) {
return windowsMoveCursorUp
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}
// assume we're running in mintty/cygwin
return posixMoveCursorUp
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}
var kernel32 = syscall.NewLazyDLL("kernel32.dll")
var (
procSetConsoleCursorPosition = kernel32.NewProc("SetConsoleCursorPosition")
procFillConsoleOutputCharacter = kernel32.NewProc("FillConsoleOutputCharacterW")
procFillConsoleOutputAttribute = kernel32.NewProc("FillConsoleOutputAttribute")
)
// windowsClearCurrentLine removes all characters from the current line and
// resets the cursor position to the first column.
func windowsClearCurrentLine(wr io.Writer, fd uintptr) {
var info windows.ConsoleScreenBufferInfo
windows.GetConsoleScreenBufferInfo(windows.Handle(fd), &info)
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// clear the line
cursor := windows.Coord{
X: info.Window.Left,
Y: info.CursorPosition.Y,
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}
var count, w uint32
count = uint32(info.Size.X)
procFillConsoleOutputAttribute.Call(fd, uintptr(info.Attributes), uintptr(count), *(*uintptr)(unsafe.Pointer(&cursor)), uintptr(unsafe.Pointer(&w)))
procFillConsoleOutputCharacter.Call(fd, uintptr(' '), uintptr(count), *(*uintptr)(unsafe.Pointer(&cursor)), uintptr(unsafe.Pointer(&w)))
}
// windowsMoveCursorUp moves the cursor to the line n lines above the current one.
func windowsMoveCursorUp(wr io.Writer, fd uintptr, n int) {
var info windows.ConsoleScreenBufferInfo
windows.GetConsoleScreenBufferInfo(windows.Handle(fd), &info)
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// move cursor up by n lines and to the first column
info.CursorPosition.Y -= int16(n)
info.CursorPosition.X = 0
procSetConsoleCursorPosition.Call(fd, uintptr(*(*int32)(unsafe.Pointer(&info.CursorPosition))))
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}
// isWindowsTerminal return true if the file descriptor is a windows terminal (cmd, psh).
func isWindowsTerminal(fd uintptr) bool {
return terminal.IsTerminal(int(fd))
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}
func isPipe(fd uintptr) bool {
typ, err := windows.GetFileType(windows.Handle(fd))
return err == nil && typ == windows.FILE_TYPE_PIPE
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}
// canUpdateStatus returns true if status lines can be printed, the process
// output is not redirected to a file or pipe.
func canUpdateStatus(fd uintptr) bool {
// easy case, the terminal is cmd or psh, without redirection
if isWindowsTerminal(fd) {
return true
}
// check if the output file type is a pipe (0x0003)
if isPipe(fd) {
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return false
}
// assume we're running in mintty/cygwin
return true
}