pty

package module
Version: v1.1.9 Latest Latest
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Published: Sep 25, 2019 License: MIT Imports: 6 Imported by: 218

README

pty

Pty is a Go package for using unix pseudo-terminals.

Install

go get github.com/creack/pty

Example

Command
package main

import (
	"github.com/creack/pty"
	"io"
	"os"
	"os/exec"
)

func main() {
	c := exec.Command("grep", "--color=auto", "bar")
	f, err := pty.Start(c)
	if err != nil {
		panic(err)
	}

	go func() {
		f.Write([]byte("foo\n"))
		f.Write([]byte("bar\n"))
		f.Write([]byte("baz\n"))
		f.Write([]byte{4}) // EOT
	}()
	io.Copy(os.Stdout, f)
}
Shell
package main

import (
        "io"
        "log"
        "os"
        "os/exec"
        "os/signal"
        "syscall"

        "github.com/creack/pty"
        "golang.org/x/crypto/ssh/terminal"
)

func test() error {
        // Create arbitrary command.
        c := exec.Command("bash")

        // Start the command with a pty.
        ptmx, err := pty.Start(c)
        if err != nil {
                return err
        }
        // Make sure to close the pty at the end.
        defer func() { _ = ptmx.Close() }() // Best effort.

        // Handle pty size.
        ch := make(chan os.Signal, 1)
        signal.Notify(ch, syscall.SIGWINCH)
        go func() {
                for range ch {
                        if err := pty.InheritSize(os.Stdin, ptmx); err != nil {
                                log.Printf("error resizing pty: %s", err)
                        }
                }
        }()
        ch <- syscall.SIGWINCH // Initial resize.

        // Set stdin in raw mode.
        oldState, err := terminal.MakeRaw(int(os.Stdin.Fd()))
        if err != nil {
                panic(err)
        }
        defer func() { _ = terminal.Restore(int(os.Stdin.Fd()), oldState) }() // Best effort.

        // Copy stdin to the pty and the pty to stdout.
        go func() { _, _ = io.Copy(ptmx, os.Stdin) }()
        _, _ = io.Copy(os.Stdout, ptmx)

        return nil
}

func main() {
        if err := test(); err != nil {
                log.Fatal(err)
        }
}

Documentation

Overview

Package pty provides functions for working with Unix terminals.

Index

Constants

This section is empty.

Variables

View Source
var ErrUnsupported = errors.New("unsupported")

ErrUnsupported is returned if a function is not available on the current platform.

Functions

func Getsize

func Getsize(t *os.File) (rows, cols int, err error)

Getsize returns the number of rows (lines) and cols (positions in each line) in terminal t.

func InheritSize added in v1.1.0

func InheritSize(pty, tty *os.File) error

InheritSize applies the terminal size of pty to tty. This should be run in a signal handler for syscall.SIGWINCH to automatically resize the tty when the pty receives a window size change notification.

func Open

func Open() (pty, tty *os.File, err error)

Opens a pty and its corresponding tty.

func Setsize added in v1.1.0

func Setsize(t *os.File, ws *Winsize) error

Setsize resizes t to s.

func Start

func Start(c *exec.Cmd) (pty *os.File, err error)

Start assigns a pseudo-terminal tty os.File to c.Stdin, c.Stdout, and c.Stderr, calls c.Start, and returns the File of the tty's corresponding pty.

func StartWithSize added in v1.1.3

func StartWithSize(c *exec.Cmd, sz *Winsize) (pty *os.File, err error)

StartWithSize assigns a pseudo-terminal tty os.File to c.Stdin, c.Stdout, and c.Stderr, calls c.Start, and returns the File of the tty's corresponding pty.

This will resize the pty to the specified size before starting the command

Types

type Winsize added in v1.1.0

type Winsize struct {
	Rows uint16 // ws_row: Number of rows (in cells)
	Cols uint16 // ws_col: Number of columns (in cells)
	X    uint16 // ws_xpixel: Width in pixels
	Y    uint16 // ws_ypixel: Height in pixels
}

Winsize describes the terminal size.

func GetsizeFull added in v1.1.0

func GetsizeFull(t *os.File) (size *Winsize, err error)

GetsizeFull returns the full terminal size description.

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