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//go:build !windows
package cwriter
import (
"bytes"
"io"
"golang.org/x/sys/unix"
)
// Writer is a buffered terminal writer, which moves cursor N lines up
// on each flush except the first one, where N is a number of lines of
// a previous flush.
type Writer struct {
*bytes.Buffer
out io.Writer
ew escWriter
fd int
terminal bool
termSize func(int) (int, int, error)
}
// Flush flushes the underlying buffer.
// It's caller's responsibility to pass correct number of lines.
func (w *Writer) Flush(lines int) error {
_, err := w.WriteTo(w.out)
// some terminals interpret 'cursor up 0' as 'cursor up 1'
if err == nil && lines > 0 {
err = w.ew.ansiCuuAndEd(w, lines)
}
return err
}
// GetSize returns the dimensions of the given terminal.
func GetSize(fd int) (width, height int, err error) {
ws, err := unix.IoctlGetWinsize(fd, unix.TIOCGWINSZ)
if err != nil {
return -1, -1, err
}
return int(ws.Col), int(ws.Row), nil
}
// IsTerminal returns whether the given file descriptor is a terminal.
func IsTerminal(fd int) bool {
_, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
return err == nil
}
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