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// +build !windows
package prompt
import (
"syscall"
"github.com/c-bata/go-prompt/internal/term"
"golang.org/x/sys/unix"
)
const maxReadBytes = 1024
// PosixParser is a ConsoleParser implementation for POSIX environment.
type PosixParser struct {
fd int
origTermios syscall.Termios
}
// Setup should be called before starting input
func (t *PosixParser) Setup() error {
// Set NonBlocking mode because if syscall.Read block this goroutine, it cannot receive data from stopCh.
if err := syscall.SetNonblock(t.fd, true); err != nil {
return err
}
if err := term.SetRaw(t.fd); err != nil {
return err
}
return nil
}
// TearDown should be called after stopping input
func (t *PosixParser) TearDown() error {
if err := syscall.SetNonblock(t.fd, false); err != nil {
return err
}
if err := term.Restore(); err != nil {
return err
}
return nil
}
// Read returns byte array.
func (t *PosixParser) Read() ([]byte, error) {
buf := make([]byte, maxReadBytes)
n, err := syscall.Read(t.fd, buf)
if err != nil {
return []byte{}, err
}
return buf[:n], nil
}
// GetWinSize returns WinSize object to represent width and height of terminal.
func (t *PosixParser) GetWinSize() *WinSize {
ws, err := unix.IoctlGetWinsize(t.fd, unix.TIOCGWINSZ)
if err != nil {
panic(err)
}
return &WinSize{
Row: ws.Row,
Col: ws.Col,
}
}
var _ ConsoleParser = &PosixParser{}
// NewStandardInputParser returns ConsoleParser object to read from stdin.
func NewStandardInputParser() *PosixParser {
in, err := syscall.Open("/dev/tty", syscall.O_RDONLY, 0)
if err != nil {
panic(err)
}
return &PosixParser{
fd: in,
}
}
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