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moby--moby/cli/command/out.go

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package command
import (
"io"
"os"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/pkg/term"
)
// OutStream is an output stream used by the DockerCli to write normal program
// output.
type OutStream struct {
out io.Writer
fd uintptr
isTerminal bool
state *term.State
}
func (o *OutStream) Write(p []byte) (int, error) {
return o.out.Write(p)
}
// FD returns the file descriptor number for this stream
func (o *OutStream) FD() uintptr {
return o.fd
}
// IsTerminal returns true if this stream is connected to a terminal
func (o *OutStream) IsTerminal() bool {
return o.isTerminal
}
// SetRawTerminal sets raw mode on the output terminal
func (o *OutStream) SetRawTerminal() (err error) {
if os.Getenv("NORAW") != "" || !o.isTerminal {
return nil
}
o.state, err = term.SetRawTerminalOutput(o.fd)
return err
}
// RestoreTerminal restores normal mode to the terminal
func (o *OutStream) RestoreTerminal() {
if o.state != nil {
term.RestoreTerminal(o.fd, o.state)
}
}
// GetTtySize returns the height and width in characters of the tty
func (o *OutStream) GetTtySize() (uint, uint) {
if !o.isTerminal {
return 0, 0
}
ws, err := term.GetWinsize(o.fd)
if err != nil {
logrus.Debugf("Error getting size: %s", err)
if ws == nil {
return 0, 0
}
}
return uint(ws.Height), uint(ws.Width)
}
// NewOutStream returns a new OutStream object from a Writer
func NewOutStream(out io.Writer) *OutStream {
fd, isTerminal := term.GetFdInfo(out)
return &OutStream{out: out, fd: fd, isTerminal: isTerminal}
}