162 lines
2.0 KiB
Go
162 lines
2.0 KiB
Go
package keyboard
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import (
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"os"
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"os/exec"
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)
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type bytes [3]byte
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// KeyEvent contains data about a keyboard event
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type KeyEvent struct {
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Bytes bytes
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Key int
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Char string
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}
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const (
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Tilde = iota + 96
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A
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B
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C
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D
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E
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F
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G
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H
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I
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J
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K
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L
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M
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N
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O
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P
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Q
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R
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S
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T
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U
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V
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W
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X
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Y
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Z
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)
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const (
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Escape = 27
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Spacebar = 32
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)
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const (
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Zero = iota + 48
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One
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Two
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Three
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Four
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Five
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Six
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Seven
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Eight
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Nine
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)
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const (
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ArrowUp = iota + 65
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ArrowDown
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ArrowRight
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ArrowLeft
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)
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// used to hold the original stty state
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var originalState string
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func Parse(input bytes) KeyEvent {
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var event = KeyEvent{Bytes: input, Char: string(input[:])}
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var code byte
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// basic input codes
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if input[1] == 0 && input[2] == 0 {
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code = input[0]
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// space bar
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if code == Spacebar {
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event.Key = Spacebar
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}
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// vanilla escape
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if code == Escape {
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event.Key = Escape
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}
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// number keys
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if code >= 48 && code <= 57 {
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event.Key = int(code)
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}
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// alphabet
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if code >= 97 && code <= 122 {
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event.Key = int(code)
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}
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return event
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}
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// arrow keys
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if input[0] == Escape && input[1] == 91 {
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code = input[2]
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if code >= 65 && code <= 68 {
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event.Key = int(code)
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return event
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}
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}
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return event
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}
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// fetches original state, sets up TTY for raw (unbuffered) input
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func configure() (err error) {
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state, err := stty("-g")
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if err != nil {
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return err
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}
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originalState = state
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// -echo: terminal doesn't echo typed characters back to the terminal
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// -icanon: terminal doesn't interpret special characters (like backspace)
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if _, err := stty("-echo", "-icanon"); err != nil {
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return err
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}
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return
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}
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// restores the TTY to the original state
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func restore() (err error) {
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if _, err = stty("echo"); err != nil {
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return
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}
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if _, err = stty(originalState); err != nil {
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return
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}
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return
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}
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func stty(args ...string) (string, error) {
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cmd := exec.Command("stty", args...)
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cmd.Stdin = os.Stdin
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out, err := cmd.Output()
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if err != nil {
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return "", err
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}
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return string(out), nil
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}
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