Golangにおける端末制御リッチなターミナルUIの実現方法

Sep 6, 20174 likes7,083 views

The document discusses terminal input/output and window resizing in Go. It covers terminal modes like canonical, non-canonical, and raw modes. It describes the termios struct and how it is used to configure terminal settings. It also discusses VT100 escape sequences for color and formatting text. Finally, it mentions using ioctl with TIOCGWINSZ to get the window size and handling SIGWINCH signals to detect resizes.

Engineering

Most read

CA.go #2
Golang
UI
AbemaTV
Masashi SHIBATA
c-bata c_bata_! "

https://github.com/c-bata/go-prompt
python-prompt-toolkit Go

Topic 1
termios
canonical mode / non-canonical mode
raw mode / cbreak mode
termios structure
KEYWORDS

Ctrl-C Enter
https://github.com/c-bata/go-prompt/blob/master/_tools/vt100_debug.go

$https://golang.org/pkg/syscall/#Termios type Termios struct { Iflag uint32 Oflag uint32 Cflag uint32 Lflag uint32 Line uint8 Cc [32]uint8 Pad_cgo_0 [3]byte Ispeed uint32 Ospeed uint32 } termios tcgetattr / tcsetattr$

$github.com/pkg/term // Cfmakeraw modifies attr for raw mode. func Cfmakeraw(attr *syscall.Termios) { attr.Iflag &^= syscall.BRKINT | syscall.ICRNL | syscall.INPCK | syscall.ISTRIP | syscall.IXON attr.Oflag &^= syscall.OPOST attr.Cflag &^= syscall.CSIZE | syscall.PARENB attr.Cflag |= syscall.CS8 attr.Lflag &^= syscall.ECHO | syscall.ICANON | syscall.IEXTEN | syscall.ISIG attr.Cc[syscall.VMIN] = 1 attr.Cc[syscall.VTIME] = 0 } https://github.com/pkg/term/blob/master/termios/termios.go$

$https://github.com/c-bata/go-prompt/blob/master/vt100_input.go Byte var asciiSequences []*ASCIICode = []*ASCIICode{ {Key: Escape, ASCIICode: []byte{0x1b}}, {Key: ControlSpace, ASCIICode: []byte{0x00}}, {Key: ControlA, ASCIICode: []byte{0x1}}, {Key: ControlB, ASCIICode: []byte{0x2}}, {Key: ControlC, ASCIICode: []byte{0x3}}, {Key: ControlD, ASCIICode: []byte{0x4}}, {Key: ControlE, ASCIICode: []byte{0x5}}, {Key: ControlF, ASCIICode: []byte{0x6}}, {Key: ControlG, ASCIICode: []byte{0x7}}, {Key: ControlH, ASCIICode: []byte{0x8}}, : }$

https://github.com/c-bata/go-prompt/blob/master/_tools/vt100_debug.go
🎉
KeyBinding
) ab←c acb

Topic 2
VT100 digital terminal device
Escape sequences
KEYWORDS

https://ja.wikipedia.org/wiki/VT100https://ja.wikipedia.org/wiki/ASR-33

https://ja.wikipedia.org/wiki/VT100https://ja.wikipedia.org/wiki/ASR-33
1960-1970

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

Topic 3
ioctl system call and TIOCGWINSZ
SIGWINCH
KEYWORDS

$Window https://github.com/c-bata/go-prompt/blob/master/_tools/window_size.go func GetWinSize(fd int) (row, col uint16, err error) { var ws *winsize retCode, _, errno := syscall.Syscall(syscall.SYS_IOCTL, uintptr(syscall.Stdin), uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(ws))) if int(retCode) == -1 { return 0, 0, fmt.Errorf(“failed with %d”, retCode) } return ws.Row, ws.Col, nil } ioctl TIOCGWINSZ SIGWINCH$

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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. CA.go #2 Golang UI AbemaTV Masashi SHIBATA c-bata c_bata_! "

2. https://github.com/c-bata/go-prompt python-prompt-toolkit Go

3. Topic 1 termios canonical mode / non-canonical mode raw mode / cbreak mode termios structure KEYWORDS

4. Ctrl-C Enter https://github.com/c-bata/go-prompt/blob/master/_tools/vt100_debug.go

5. Non-Cannonical Mode ( )

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. 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. 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. raw raw mode VMIN=1 / VTIME=0

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. 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. https://github.com/c-bata/go-prompt/blob/master/_tools/vt100_debug.go 🎉 KeyBinding ) ab←c acb

13. Topic 2 VT100 digital terminal device Escape sequences KEYWORDS

14. UI

15. https://ja.wikipedia.org/wiki/VT100https://ja.wikipedia.org/wiki/ASR-33

16. https://ja.wikipedia.org/wiki/VT100https://ja.wikipedia.org/wiki/ASR-33 1960-1970

17. https://ja.wikipedia.org/wiki/VT100https://ja.wikipedia.org/wiki/ASR-33 ( ) →

18. VT100 Escape Sequences VT100 ANSI

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. 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. 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. 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. Topic 3 ioctl system call and TIOCGWINSZ SIGWINCH KEYWORDS

25. kube-prompt

27. 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

28. Window https://github.com/c-bata/go-prompt/blob/master/_tools/window_size.go

Golangにおける端末制御 リッチなターミナルUIの実現方法

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Golangにおける端末制御リッチなターミナルUIの実現方法