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// +build !windows
package prompt
import (
"syscall"
)
const flushMaxRetryCount = 3
// PosixWriter is a ConsoleWriter implementation for POSIX environment.
// To control terminal emulator, this outputs VT100 escape sequences.
type PosixWriter struct {
VT100Writer
fd int
}
// Flush to flush buffer
func (w *PosixWriter) Flush() error {
l := len(w.buffer)
offset := 0
retry := 0
for {
n, err := syscall.Write(w.fd, w.buffer[offset:])
if err != nil {
if retry < flushMaxRetryCount {
retry++
continue
}
return err
}
offset += n
if offset == l {
break
}
}
w.buffer = []byte{}
return nil
}
var _ ConsoleWriter = &PosixWriter{}
var (
// NewStandardOutputWriter returns ConsoleWriter object to write to stdout.
// This generates VT100 escape sequences because almost terminal emulators
// in POSIX OS built on top of a VT100 specification.
// Deprecated: Please use NewStdoutWriter
NewStandardOutputWriter = NewStdoutWriter
)
// NewStdoutWriter returns ConsoleWriter object to write to stdout.
// This generates VT100 escape sequences because almost terminal emulators
// in POSIX OS built on top of a VT100 specification.
func NewStdoutWriter() ConsoleWriter {
return &PosixWriter{
fd: syscall.Stdout,
}
}
// NewStderrWriter returns ConsoleWriter object to write to stderr.
// This generates VT100 escape sequences because almost terminal emulators
// in POSIX OS built on top of a VT100 specification.
func NewStderrWriter() ConsoleWriter {
return &PosixWriter{
fd: syscall.Stderr,
}
}
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