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643a2359e4
... to work around some of the "unexpected EOF" failures. Signed-off-by: Miloslav Trmač <mitr@redhat.com>
49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
//go:build !windows
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package cwriter
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import (
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"bytes"
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"io"
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"golang.org/x/sys/unix"
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)
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// Writer is a buffered terminal writer, which moves cursor N lines up
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// on each flush except the first one, where N is a number of lines of
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// a previous flush.
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type Writer struct {
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*bytes.Buffer
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out io.Writer
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ew escWriter
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fd int
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terminal bool
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termSize func(int) (int, int, error)
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}
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// Flush flushes the underlying buffer.
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// It's caller's responsibility to pass correct number of lines.
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func (w *Writer) Flush(lines int) error {
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_, err := w.WriteTo(w.out)
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// some terminals interpret 'cursor up 0' as 'cursor up 1'
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if err == nil && lines > 0 {
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err = w.ew.ansiCuuAndEd(w, lines)
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}
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return err
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}
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// GetSize returns the dimensions of the given terminal.
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func GetSize(fd int) (width, height int, err error) {
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ws, err := unix.IoctlGetWinsize(fd, unix.TIOCGWINSZ)
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if err != nil {
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return -1, -1, err
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}
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return int(ws.Col), int(ws.Row), 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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_, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
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return err == nil
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}
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