Golang : Handling Yes No Quit query input



Tags : golang keyboard-input yes-no-quit-prompt get-char

The following is a simple program that will accept a single key answer from the console without the user hitting the Enter button and check if the answer is valid or not. Basically what it does is to prompt the user with a question and expect the user to answer Yes, No or Quit. Useful in situation where your program needs the user to give permission or customize/install certain modules.

Here you go!


 package main

 /*
 #include <stdio.h>
 #include <unistd.h>
 #include <termios.h>
 char getch(){
 char ch = 0;
 struct termios old = {0};
 fflush(stdout);
 if( tcgetattr(0, &old) < 0 ) perror("tcsetattr()");
 old.c_lflag &= ~ICANON;
 old.c_lflag &= ~ECHO;
 old.c_cc[VMIN] = 1;
 old.c_cc[VTIME] = 0;
 if( tcsetattr(0, TCSANOW, &old) < 0 ) perror("tcsetattr ICANON");
 if( read(0, &ch,1) < 0 ) perror("read()");
 old.c_lflag |= ICANON;
 old.c_lflag |= ECHO;
 if(tcsetattr(0, TCSADRAIN, &old) < 0) perror("tcsetattr ~ICANON");
 return ch;
 }
 */
 import "C"

 // stackoverflow.com/questions/14094190/golang-function-similar-to-getchar

 import (
 "fmt"
 "math/rand" // to randomize the questions
 "os"
 "strings"
 "time"
 )

 func main() {
 validAnswers := map[string]string{"y": "yes", "n": "no", "q": "quit"}

 questions := []string{"Do you want to make peace with the rest of the world?", "Terminate evil artificial intelligence program?", "Do you believe in a future that robot help us unconditionally?", "Promise to be a good boy?", "Spank them?"}

 prompt := "[Yes/No/Quit]"

 rand.Seed(time.Now().UnixNano())

 for {
 fmt.Println(questions[rand.Intn(len(questions))] + " " + prompt)

 // get a single character from keyboard with hitting Enter button
 // if you need your user to hit the Enter key
 // see https://www.socketloop.com/tutorials/golang-get-input-from-keyboard
 char := C.getch()

 // convert type C.char to Golang string type
 answer := fmt.Sprintf("%c", char)
 answer = strings.ToLower(answer)

 if validAnswers[answer] == "" {
 fmt.Println("Please respond with y, n or q")
 } else {
 fmt.Println("Your answer is : ", validAnswers[answer])
 }

 if answer == "q" {
 fmt.Println("Bye!")
 os.Exit(0)
 }

 }

 }

Sample output:

Spank them? [Yes/No/Quit]

Your answer is : yes

Do you believe in a future that robot help us unconditionally? [Yes/No/Quit]

Your answer is : no

Do you believe in a future that robot help us unconditionally? [Yes/No/Quit]

Your answer is : quit

Bye!

Do you want to make peace with the rest of the world? [Yes/No/Quit]

Your answer is : yes

Terminate evil artificial intelligence program? [Yes/No/Quit]

Your answer is : yes

Do you believe in a future that robot help us unconditionally? [Yes/No/Quit]

Your answer is : yes

Do you want to make peace with the rest of the world? [Yes/No/Quit]

Your answer is : yes

Do you want to make peace with the rest of the world? [Yes/No/Quit]

Your answer is : yes

Terminate evil artificial intelligence program? [Yes/No/Quit]

Your answer is : yes

Do you want to make peace with the rest of the world? [Yes/No/Quit]

Your answer is : yes

Promise to be a good boy? [Yes/No/Quit]

Your answer is : no

Terminate evil artificial intelligence program? [Yes/No/Quit]

Your answer is : quit

Bye!

References:

https://www.socketloop.com/tutorials/golang-check-if-element-exist-in-map

https://www.socketloop.com/tutorials/golang-randomly-pick-an-item-from-a-slice-array-example

https://www.socketloop.com/tutorials/golang-get-input-from-keyboard

  See also : Golang : Get input from keyboard



Tags : golang keyboard-input yes-no-quit-prompt get-char

By Adam Ng

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.


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