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go-prompt/posix_input.go

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// +build !windows
package prompt
import (
"bytes"
"log"
"syscall"
"unsafe"
"github.com/pkg/term/termios"
)
const maxReadBytes = 1024
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 {
log.Println("[ERROR] Cannot set non blocking mode.")
return err
}
if err := t.setRawMode(); err != nil {
log.Println("[ERROR] Cannot set raw mode.")
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 {
log.Println("[ERROR] Cannot set blocking mode.")
return err
}
if err := t.resetRawMode(); err != nil {
log.Println("[ERROR] Cannot reset from raw mode.")
return err
}
return nil
}
// Read returns byte array.
func (t *PosixParser) Read() ([]byte, error) {
buf := make([]byte, maxReadBytes)
n, err := syscall.Read(syscall.Stdin, buf)
if err != nil {
return []byte{}, err
}
return buf[:n], nil
}
func (t *PosixParser) setRawMode() error {
x := t.origTermios.Lflag
if x &^= syscall.ICANON; x != 0 && x == t.origTermios.Lflag {
// fd is already raw mode
return nil
}
var n syscall.Termios
if err := termios.Tcgetattr(uintptr(t.fd), &t.origTermios); err != nil {
return err
}
n = t.origTermios
// "&^=" used like: https://play.golang.org/p/8eJw3JxS4O
n.Lflag &^= syscall.ECHO | syscall.ICANON | syscall.IEXTEN | syscall.ISIG
n.Cc[syscall.VMIN] = 1
n.Cc[syscall.VTIME] = 0
termios.Tcsetattr(uintptr(t.fd), termios.TCSANOW, &n)
return nil
}
func (t *PosixParser) resetRawMode() error {
if t.origTermios.Lflag == 0 {
return nil
}
return termios.Tcsetattr(uintptr(t.fd), termios.TCSANOW, &t.origTermios)
}
// GetKey returns Key correspond to input byte codes.
func (t *PosixParser) GetKey(b []byte) Key {
for _, k := range asciiSequences {
if bytes.Equal(k.ASCIICode, b) {
return k.Key
}
}
return NotDefined
}
// winsize is winsize struct got from the ioctl(2) system call.
type ioctlWinsize struct {
Row uint16
Col uint16
X uint16 // pixel value
Y uint16 // pixel value
}
// GetWinSize returns WinSize object to represent width and height of terminal.
func (t *PosixParser) GetWinSize() *WinSize {
ws := &ioctlWinsize{}
retCode, _, errno := syscall.Syscall(
syscall.SYS_IOCTL,
uintptr(t.fd),
uintptr(syscall.TIOCGWINSZ),
uintptr(unsafe.Pointer(ws)))
if int(retCode) == -1 {
panic(errno)
}
return &WinSize{
Row: ws.Row,
Col: ws.Col,
}
}
var asciiSequences = []*ASCIICode{
{Key: Escape, ASCIICode: []byte{0x1b}},
{Key: ControlSpace, ASCIICode: []byte{0x00}},
{Key: ControlA, ASCIICode: []byte{0x1}},
{Key: ControlB, ASCIICode: []byte{0x2}},
{Key: ControlC, ASCIICode: []byte{0x3}},
{Key: ControlD, ASCIICode: []byte{0x4}},
{Key: ControlE, ASCIICode: []byte{0x5}},
{Key: ControlF, ASCIICode: []byte{0x6}},
{Key: ControlG, ASCIICode: []byte{0x7}},
{Key: ControlH, ASCIICode: []byte{0x8}},
//{Key: ControlI, ASCIICode: []byte{0x9}},
//{Key: ControlJ, ASCIICode: []byte{0xa}},
{Key: ControlK, ASCIICode: []byte{0xb}},
{Key: ControlL, ASCIICode: []byte{0xc}},
{Key: ControlM, ASCIICode: []byte{0xd}},
{Key: ControlN, ASCIICode: []byte{0xe}},
{Key: ControlO, ASCIICode: []byte{0xf}},
{Key: ControlP, ASCIICode: []byte{0x10}},
{Key: ControlQ, ASCIICode: []byte{0x11}},
{Key: ControlR, ASCIICode: []byte{0x12}},
{Key: ControlS, ASCIICode: []byte{0x13}},
{Key: ControlT, ASCIICode: []byte{0x14}},
{Key: ControlU, ASCIICode: []byte{0x15}},
{Key: ControlV, ASCIICode: []byte{0x16}},
{Key: ControlW, ASCIICode: []byte{0x17}},
{Key: ControlX, ASCIICode: []byte{0x18}},
{Key: ControlY, ASCIICode: []byte{0x19}},
{Key: ControlZ, ASCIICode: []byte{0x1a}},
{Key: ControlBackslash, ASCIICode: []byte{0x1c}},
{Key: ControlSquareClose, ASCIICode: []byte{0x1d}},
{Key: ControlCircumflex, ASCIICode: []byte{0x1e}},
{Key: ControlUnderscore, ASCIICode: []byte{0x1f}},
{Key: Backspace, ASCIICode: []byte{0x7f}},
{Key: Up, ASCIICode: []byte{0x1b, 0x5b, 0x41}},
{Key: Down, ASCIICode: []byte{0x1b, 0x5b, 0x42}},
{Key: Right, ASCIICode: []byte{0x1b, 0x5b, 0x43}},
{Key: Left, ASCIICode: []byte{0x1b, 0x5b, 0x44}},
{Key: Home, ASCIICode: []byte{0x1b, 0x5b, 0x48}},
{Key: Home, ASCIICode: []byte{0x1b, 0x30, 0x48}},
{Key: End, ASCIICode: []byte{0x1b, 0x5b, 0x46}},
{Key: End, ASCIICode: []byte{0x1b, 0x30, 0x46}},
{Key: Enter, ASCIICode: []byte{0xa}},
{Key: Delete, ASCIICode: []byte{0x1b, 0x5b, 0x33, 0x7e}},
{Key: ShiftDelete, ASCIICode: []byte{0x1b, 0x5b, 0x33, 0x3b, 0x32, 0x7e}},
{Key: ControlDelete, ASCIICode: []byte{0x1b, 0x5b, 0x33, 0x3b, 0x35, 0x7e}},
{Key: Home, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x7e}},
{Key: End, ASCIICode: []byte{0x1b, 0x5b, 0x34, 0x7e}},
{Key: PageUp, ASCIICode: []byte{0x1b, 0x5b, 0x35, 0x7e}},
{Key: PageDown, ASCIICode: []byte{0x1b, 0x5b, 0x36, 0x7e}},
{Key: Home, ASCIICode: []byte{0x1b, 0x5b, 0x37, 0x7e}},
{Key: End, ASCIICode: []byte{0x1b, 0x5b, 0x38, 0x7e}},
{Key: Tab, ASCIICode: []byte{0x9}},
{Key: BackTab, ASCIICode: []byte{0x1b, 0x5b, 0x5a}},
{Key: Insert, ASCIICode: []byte{0x1b, 0x5b, 0x32, 0x7e}},
{Key: F1, ASCIICode: []byte{0x1b, 0x4f, 0x50}},
{Key: F2, ASCIICode: []byte{0x1b, 0x4f, 0x51}},
{Key: F3, ASCIICode: []byte{0x1b, 0x4f, 0x52}},
{Key: F4, ASCIICode: []byte{0x1b, 0x4f, 0x53}},
{Key: F1, ASCIICode: []byte{0x1b, 0x4f, 0x50, 0x41}}, // Linux console
{Key: F2, ASCIICode: []byte{0x1b, 0x5b, 0x5b, 0x42}}, // Linux console
{Key: F3, ASCIICode: []byte{0x1b, 0x5b, 0x5b, 0x43}}, // Linux console
{Key: F4, ASCIICode: []byte{0x1b, 0x5b, 0x5b, 0x44}}, // Linux console
{Key: F5, ASCIICode: []byte{0x1b, 0x5b, 0x5b, 0x45}}, // Linux console
{Key: F1, ASCIICode: []byte{0x1b, 0x5b, 0x11, 0x7e}}, // rxvt-unicode
{Key: F2, ASCIICode: []byte{0x1b, 0x5b, 0x12, 0x7e}}, // rxvt-unicode
{Key: F3, ASCIICode: []byte{0x1b, 0x5b, 0x13, 0x7e}}, // rxvt-unicode
{Key: F4, ASCIICode: []byte{0x1b, 0x5b, 0x14, 0x7e}}, // rxvt-unicode
{Key: F5, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x35, 0x7e}},
{Key: F6, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x37, 0x7e}},
{Key: F7, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x38, 0x7e}},
{Key: F8, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x39, 0x7e}},
{Key: F9, ASCIICode: []byte{0x1b, 0x5b, 0x32, 0x30, 0x7e}},
{Key: F10, ASCIICode: []byte{0x1b, 0x5b, 0x32, 0x31, 0x7e}},
{Key: F11, ASCIICode: []byte{0x1b, 0x5b, 0x32, 0x32, 0x7e}},
{Key: F12, ASCIICode: []byte{0x1b, 0x5b, 0x32, 0x34, 0x7e, 0x8}},
{Key: F13, ASCIICode: []byte{0x1b, 0x5b, 0x25, 0x7e}},
{Key: F14, ASCIICode: []byte{0x1b, 0x5b, 0x26, 0x7e}},
{Key: F15, ASCIICode: []byte{0x1b, 0x5b, 0x28, 0x7e}},
{Key: F16, ASCIICode: []byte{0x1b, 0x5b, 0x29, 0x7e}},
{Key: F17, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x7e}},
{Key: F18, ASCIICode: []byte{0x1b, 0x5b, 0x32, 0x7e}},
{Key: F19, ASCIICode: []byte{0x1b, 0x5b, 0x33, 0x7e}},
{Key: F20, ASCIICode: []byte{0x1b, 0x5b, 0x34, 0x7e}},
// Xterm
{Key: F13, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x3b, 0x32, 0x50}},
{Key: F14, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x3b, 0x32, 0x51}},
// &ASCIICode{Key: F15, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x3b, 0x32, 0x52}}, // Conflicts with CPR response
{Key: F16, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x3b, 0x32, 0x52}},
{Key: F17, ASCIICode: []byte{0x1b, 0x5b, 0x15, 0x3b, 0x32, 0x7e}},
{Key: F18, ASCIICode: []byte{0x1b, 0x5b, 0x17, 0x3b, 0x32, 0x7e}},
{Key: F19, ASCIICode: []byte{0x1b, 0x5b, 0x18, 0x3b, 0x32, 0x7e}},
{Key: F20, ASCIICode: []byte{0x1b, 0x5b, 0x19, 0x3b, 0x32, 0x7e}},
{Key: F21, ASCIICode: []byte{0x1b, 0x5b, 0x20, 0x3b, 0x32, 0x7e}},
{Key: F22, ASCIICode: []byte{0x1b, 0x5b, 0x21, 0x3b, 0x32, 0x7e}},
{Key: F23, ASCIICode: []byte{0x1b, 0x5b, 0x23, 0x3b, 0x32, 0x7e}},
{Key: F24, ASCIICode: []byte{0x1b, 0x5b, 0x24, 0x3b, 0x32, 0x7e}},
{Key: ControlUp, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x3b, 0x35, 0x41}},
{Key: ControlDown, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x3b, 0x35, 0x42}},
{Key: ControlRight, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x3b, 0x35, 0x43}},
{Key: ControlLeft, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x3b, 0x35, 0x44}},
{Key: ShiftUp, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x3b, 0x32, 0x41}},
{Key: ShiftDown, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x3b, 0x32, 0x42}},
{Key: ShiftRight, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x3b, 0x32, 0x43}},
{Key: ShiftLeft, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x3b, 0x32, 0x44}},
// Tmux sends following keystrokes when control+arrow is pressed, but for
// Emacs ansi-term sends the same sequences for normal arrow keys. Consider
// it a normal arrow press, because that's more important.
{Key: Up, ASCIICode: []byte{0x1b, 0x4f, 0x41}},
{Key: Down, ASCIICode: []byte{0x1b, 0x4f, 0x42}},
{Key: Right, ASCIICode: []byte{0x1b, 0x4f, 0x43}},
{Key: Left, ASCIICode: []byte{0x1b, 0x4f, 0x44}},
{Key: ControlUp, ASCIICode: []byte{0x1b, 0x5b, 0x35, 0x41}},
{Key: ControlDown, ASCIICode: []byte{0x1b, 0x5b, 0x35, 0x42}},
{Key: ControlRight, ASCIICode: []byte{0x1b, 0x5b, 0x35, 0x43}},
{Key: ControlLeft, ASCIICode: []byte{0x1b, 0x5b, 0x35, 0x44}},
{Key: ControlRight, ASCIICode: []byte{0x1b, 0x5b, 0x4f, 0x63}}, // rxvt
{Key: ControlLeft, ASCIICode: []byte{0x1b, 0x5b, 0x4f, 0x64}}, // rxvt
{Key: Ignore, ASCIICode: []byte{0x1b, 0x5b, 0x45}}, // Xterm
{Key: Ignore, ASCIICode: []byte{0x1b, 0x5b, 0x46}}, // Linux console
}
var _ ConsoleParser = &PosixParser{}
func NewStandardInputParser() *PosixParser {
return &PosixParser{
fd: syscall.Stdin,
}
}
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