How to Detect Enter and Backspace Keys in Golang STDIN Input?

How to Detect Special Keys (Enter, Backspace) in Golang STDIN Input

When reading user input from stdin in Go, the default behavior is to capture all characters until an end-of-line character (e.g., the "enter" key) is pressed. To detect special keys like "enter" or "backspace" and perform specific actions, we need to find a way to interpret the byte representation of these keys within our program.

In the original code provided, which captures user input in a loop:

for {
    input += string(b)
}

The variable b is a byte array of size 1 that is used to read a single byte at a time from stdin. To identify special keys, we need to understand how these keys are represented as bytes.

For example, the "enter" key generates a byte value of 10 (line feed), while the "backspace" key generates a byte value of 127 (in POSIX systems), or 8 (backspace).

To detect these special keys, we can use a more advanced approach:

package main

import (
    "fmt"
    "os"
    "term"
)

func main() {
    err := term.Init()
    if err != nil {
        panic(err)
    }

    defer term.Close()

    for {
        ev := term.PollEvent()

        switch ev.Type {
        case term.EventKey:
            // Check for special keys
            switch ev.Key {
            case term.KeyEnter:
                fmt.Println("Enter pressed")
            case term.KeyBackspace:
                fmt.Println("Backspace pressed")
            }
        }
    }
}

In this updated code:

• We use the term library to handle terminal events.
• We check the ev.Type to determine if a key was pressed.
• We check the ev.Key to identify which key was pressed.

By using this approach, you can now handle special keys like "enter" or "backspace" and perform custom actions as needed.

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