Add termstatus

internal/ui/termstatus/terminal_unix.go

@@ -0,0 +1,34 @@
+// +build !windows
+
+package termstatus
+
+import (
+	"io"
+	"syscall"
+	"unsafe"
+
+	isatty "github.com/mattn/go-isatty"
+)
+
+// clearLines will clear the current line and the n lines above. Afterwards the
+// cursor is positioned at the start of the first cleared line.
+func clearLines(wr io.Writer, fd uintptr) clearLinesFunc {
+	return posixClearLines
+}
+
+// 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 {
+	return isatty.IsTerminal(fd)
+}
+
+// getTermSize returns the dimensions of the given terminal.
+// the code is taken from "golang.org/x/crypto/ssh/terminal"
+func getTermSize(fd uintptr) (width, height int, err error) {
+	var dimensions [4]uint16
+
+	if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, fd, uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(&dimensions)), 0, 0, 0); err != 0 {
+		return -1, -1, err
+	}
+	return int(dimensions[1]), int(dimensions[0]), nil
+}