keyboard

README

Keyboard

Simple library to listen for keystrokes from the keyboard

The code is inspired by termbox-go library.

Installation

Install and update this go package with go get -u github.com/eiannone/keyboard

Usage

Example of getting a single keystroke:

char, _, err := keyboard.GetSingleKey()
if (err != nil) {
    panic(err)
}
fmt.Printf("You pressed: %q\r\n", char)

Example of getting a series of keystrokes with a blocking GetKey() function:

package main

import (
	"fmt"
	"github.com/eiannone/keyboard"
)

func main() {		
	if err := keyboard.Open(); err != nil {
		panic(err)
	}
	defer func() {
		_ = keyboard.Close()
	}()

	fmt.Println("Press ESC to quit")
	for {
		char, key, err := keyboard.GetKey()
		if err != nil {
			panic(err)
		}
		fmt.Printf("You pressed: rune %q, key %X\r\n", char, key)
        if key == keyboard.KeyEsc {
			break
		}
	}	
}

Example of getting a series of keystrokes using a channel:

package main

import (
	"fmt"
	"github.com/eiannone/keyboard"
)

func main() {
	keysEvents, err := keyboard.GetKeys(10)
	if err != nil {
		panic(err)
	}
	defer func() {
		_ = keyboard.Close()
	}()

	fmt.Println("Press ESC to quit")
	for {
		event := <-keysEvents
		if event.Err != nil {
			panic(event.Err)
		}
		fmt.Printf("You pressed: rune %q, key %X\r\n", event.Rune, event.Key)
		if event.Key == keyboard.KeyEsc {
			break
		}
	}
}

Documentation

Index

• func Close() (err error)
• func GetKeys(bufferSize int) (<-chan KeyEvent, error)
• func IsStarted(timeout time.Duration) bool
• func KeysForTesting() chan<- KeyEvent
• func Open() (err error)
• type Key
  • func GetKey() (rune, Key, error)
  • func GetSingleKey() (ch rune, key Key, err error)
• type KeyEvent

Functions

func Close

func Close() (err error)

Should be called after successful initialization when functionality isn't required anymore.

func GetKeys

func GetKeys(bufferSize int) (<-chan KeyEvent, error)

func IsStarted

func IsStarted(timeout time.Duration) bool

func KeysForTesting

func KeysForTesting() chan<- KeyEvent

KeysForTesting returns the same channel as GetKeys, but in the other direction. Available for sending keys while testing.

func Open

func Open() (err error)

Types

type Key

type Key uint16

const (
	KeyF1 Key = 0xFFFF - iota
	KeyF2
	KeyF3
	KeyF4
	KeyF5
	KeyF6
	KeyF7
	KeyF8
	KeyF9
	KeyF10
	KeyF11
	KeyF12
	KeyInsert
	KeyDelete
	KeyHome
	KeyEnd
	KeyPgup
	KeyPgdn
	KeyArrowUp
	KeyArrowDown
	KeyArrowLeft
	KeyArrowRight
)

Key constants, see GetKey() function.

const (
	KeyCtrlTilde      Key = 0x00
	KeyCtrl2          Key = 0x00
	KeyCtrlSpace      Key = 0x00
	KeyCtrlA          Key = 0x01
	KeyCtrlB          Key = 0x02
	KeyCtrlC          Key = 0x03
	KeyCtrlD          Key = 0x04
	KeyCtrlE          Key = 0x05
	KeyCtrlF          Key = 0x06
	KeyCtrlG          Key = 0x07
	KeyBackspace      Key = 0x08
	KeyCtrlH          Key = 0x08
	KeyTab            Key = 0x09
	KeyCtrlI          Key = 0x09
	KeyCtrlJ          Key = 0x0A
	KeyCtrlK          Key = 0x0B
	KeyCtrlL          Key = 0x0C
	KeyEnter          Key = 0x0D
	KeyCtrlM          Key = 0x0D
	KeyCtrlN          Key = 0x0E
	KeyCtrlO          Key = 0x0F
	KeyCtrlP          Key = 0x10
	KeyCtrlQ          Key = 0x11
	KeyCtrlR          Key = 0x12
	KeyCtrlS          Key = 0x13
	KeyCtrlT          Key = 0x14
	KeyCtrlU          Key = 0x15
	KeyCtrlV          Key = 0x16
	KeyCtrlW          Key = 0x17
	KeyCtrlX          Key = 0x18
	KeyCtrlY          Key = 0x19
	KeyCtrlZ          Key = 0x1A
	KeyEsc            Key = 0x1B
	KeyCtrlLsqBracket Key = 0x1B
	KeyCtrl3          Key = 0x1B
	KeyCtrl4          Key = 0x1C
	KeyCtrlBackslash  Key = 0x1C
	KeyCtrl5          Key = 0x1D
	KeyCtrlRsqBracket Key = 0x1D
	KeyCtrl6          Key = 0x1E
	KeyCtrl7          Key = 0x1F
	KeyCtrlSlash      Key = 0x1F
	KeyCtrlUnderscore Key = 0x1F
	KeySpace          Key = 0x20
	KeyBackspace2     Key = 0x7F
	KeyCtrl8          Key = 0x7F
)

func GetKey

func GetKey() (rune, Key, error)

func GetSingleKey

func GetSingleKey() (ch rune, key Key, err error)

type KeyEvent

type KeyEvent struct {
	Key  Key   // One of Key* constants, invalid if 'Ch' is not 0
	Rune rune  // A unicode character
	Err  error // Error in case if input failed
}