Simple Task Manager CLI App in Golang

task_manager_cli.go

package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	tasks := []string{}
	scanner := bufio.NewScanner(os.Stdin)

	defer fmt.Println("Exiting the Task Manager. Goodbye!")

	for {
		fmt.Println("\nTask Manager CLI")
		fmt.Println("=================")
		fmt.Println("1. Add Task")
		fmt.Println("2. View Tasks")
		fmt.Println("3. Delete Task")
		fmt.Println("4. Exit")
		fmt.Print("Enter your choice (1-4): ")

		var choice int
		_, err := fmt.Scanf("%d\n", &choice)
		if err != nil {
			fmt.Println("Invalid input. Please enter a number between 1 and 4.")
			continue
		}

		switch choice {
		case 1:
			fmt.Print("Enter a new task: ")
			if scanner.Scan() {
				task := scanner.Text()
				if task == "" {
					fmt.Println("Task cannot be empty.")
				} else {
					tasks = append(tasks, task)
					fmt.Println("Task added successfully!")
				}
			}
		case 2:
			if len(tasks) == 0 {
				fmt.Println("No tasks available.")
			} else {
				fmt.Println("\nYour Tasks:")
				for i, task := range tasks {
					fmt.Printf("%d. %s\n", i+1, task)
				}
			}
		case 3:
			if len(tasks) == 0 {
				fmt.Println("No tasks to delete.")
			} else {
				fmt.Println("Enter the task number to delete:")
				for i, task := range tasks {
					fmt.Printf("%d. %s\n", i+1, task)
				}
				var taskNumber int
				_, err := fmt.Scanf("%d\n", &taskNumber)
				if err != nil || taskNumber < 1 || taskNumber > len(tasks) {
					fmt.Println("Invalid task number.")
				} else {
					tasks = append(tasks[:taskNumber-1], tasks[taskNumber:]...)
					fmt.Println("Task deleted successfully!")
				}
			}
		case 4:
			return
		default:
			fmt.Println("Invalid choice. Please select a number between 1 and 4.")
		}
	}
}