restic/internal/ui/termstatus/terminal_posix.go

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2018-04-22 09:57:11 +00:00
package termstatus
import (
"fmt"
"io"
"os"
)
const (
posixMoveCursorHome = "\r"
posixMoveCursorUp = "\x1b[1A"
posixClearLine = "\x1b[2K"
)
// posixClearLines will clear the current line and the n lines above.
// Afterwards the cursor is positioned at the start of the first cleared line.
func posixClearLines(wr io.Writer, fd uintptr, n int) {
// clear current line
_, err := wr.Write([]byte(posixMoveCursorHome + posixClearLine))
if err != nil {
fmt.Fprintf(os.Stderr, "write failed: %v\n", err)
return
}
for ; n > 0; n-- {
// clear current line and move on line up
_, err := wr.Write([]byte(posixMoveCursorUp + posixClearLine))
if err != nil {
fmt.Fprintf(os.Stderr, "write failed: %v\n", err)
return
}
}
}