Golangにおける端末制御 リッチなターミナルUIの実現方法

Golangにおける端末制御 リッチなターミナルUIの実現方法

1. 1. CA.go #2 Golang UI AbemaTV Masashi SHIBATA c-bata c_bata_! "
2. 2. https://github.com/c-bata/go-prompt python-prompt-toolkit Go
3. 3. Topic 1 termios canonical mode / non-canonical mode raw mode / cbreak mode termios structure KEYWORDS
4. 4. Ctrl-C Enter https://github.com/c-bata/go-prompt/blob/master/_tools/vt100_debug.go
5. 5. Non-Cannonical Mode ( )
6. 6. https://golang.org/pkg/syscall/#Termios type Termios struct { Iflag uint32 Oflag uint32 Cflag uint32 Lflag uint32 Line uint8 Cc [32]uint8 Pad_cgo_0 [3]byte Ispeed uint32 Ospeed uint32 } termios tcgetattr / tcsetattr
7. 7. https://golang.org/pkg/syscall/#Termios type Termios struct { Iflag uint32 Oflag uint32 Cflag uint32 Lflag uint32 Line uint8 Cc [32]uint8 Pad_cgo_0 [3]byte Ispeed uint32 Ospeed uint32 } termios tcgetattr / tcsetattr ICANON(2bit )
8. 8. https://golang.org/pkg/syscall/#Termios type Termios struct { Iflag uint32 Oflag uint32 Cflag uint32 Lflag uint32 Line uint8 Cc [32]uint8 Pad_cgo_0 [3]byte Ispeed uint32 Ospeed uint32 } termios tcgetattr / tcsetattr VMIN / VTIME
9. 9. raw raw mode VMIN=1 / VTIME=0
10. 10. github.com/pkg/term // Cfmakeraw modifies attr for raw mode. func Cfmakeraw(attr *syscall.Termios) { attr.Iflag &^= syscall.BRKINT | syscall.ICRNL | syscall.INPCK | syscall.ISTRIP | syscall.IXON attr.Oflag &^= syscall.OPOST attr.Cflag &^= syscall.CSIZE | syscall.PARENB attr.Cflag |= syscall.CS8 attr.Lflag &^= syscall.ECHO | syscall.ICANON | syscall.IEXTEN | syscall.ISIG attr.Cc[syscall.VMIN] = 1 attr.Cc[syscall.VTIME] = 0 } https://github.com/pkg/term/blob/master/termios/termios.go
11. 11. https://github.com/c-bata/go-prompt/blob/master/vt100_input.go Byte var asciiSequences []*ASCIICode = []*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}}, : }
12. 12. https://github.com/c-bata/go-prompt/blob/master/_tools/vt100_debug.go 🎉 KeyBinding ) ab←c acb
13. 13. Topic 2 VT100 digital terminal device Escape sequences KEYWORDS
14. 14. UI
15. 15. https://ja.wikipedia.org/wiki/VT100https://ja.wikipedia.org/wiki/ASR-33
16. 16. https://ja.wikipedia.org/wiki/VT100https://ja.wikipedia.org/wiki/ASR-33 1960-1970
17. 17. https://ja.wikipedia.org/wiki/VT100https://ja.wikipedia.org/wiki/ASR-33 ( ) →
18. 18. VT100 Escape Sequences VT100 ANSI
19. 19. VT100 syscall.Write(syscall.Stdin, []byte("x1b[4;30;46m")) syscall.Write(syscall.Stdin, []byte("Hello Worldn")) syscall.Write(syscall.Stdin, []byte("x1b[0m")) http://vt100.net/docs/vt100-ug/chapter3.html
20. 20. VT100 syscall.Write(syscall.Stdin, []byte("x1b[4;30;46m")) syscall.Write(syscall.Stdin, []byte("Hello Worldn")) syscall.Write(syscall.Stdin, []byte("x1b[0m")) http://vt100.net/docs/vt100-ug/chapter3.html x1b[ 4;30;46 m Control Sequence Introducer (CSI)
21. 21. VT100 syscall.Write(syscall.Stdin, []byte("x1b[4;30;46m")) syscall.Write(syscall.Stdin, []byte("Hello Worldn")) syscall.Write(syscall.Stdin, []byte("x1b[0m")) http://vt100.net/docs/vt100-ug/chapter3.html x1b[ 4;30;46 m : :
22. 22. VT100 syscall.Write(syscall.Stdin, []byte("x1b[4;30;46m")) syscall.Write(syscall.Stdin, []byte("Hello Worldn")) syscall.Write(syscall.Stdin, []byte("x1b[0m")) http://vt100.net/docs/vt100-ug/chapter3.html x1b[ 4;30;46 m Final Character
23. 23. Topic 3 ioctl system call and TIOCGWINSZ SIGWINCH KEYWORDS
24. 24. kube-prompt
25. 25. Window https://github.com/c-bata/go-prompt/blob/master/_tools/window_size.go func GetWinSize(fd int) (row, col uint16, err error) { var ws *winsize retCode, _, errno := syscall.Syscall(syscall.SYS_IOCTL, uintptr(syscall.Stdin), uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(ws))) if int(retCode) == -1 { return 0, 0, fmt.Errorf(“failed with %d”, retCode) } return ws.Row, ws.Col, nil } ioctl TIOCGWINSZ SIGWINCH
26. 26. Window https://github.com/c-bata/go-prompt/blob/master/_tools/window_size.go