Building a Simple CLI To-Do App in Rust Using Cargo

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

cargo new rust_todo
cd rust_todo

use std::io::stdin;

struct Task {
    id: u32,
    name: String,
}

fn main() {
    let mut tasks: Vec<Task> = Vec::new();

    loop {
        println!("\nSimple CRUD App");
        println!("1. Add Task");
        println!("2. View Tasks");
        println!("3. Delete Task");
        println!("4. Exit");
        println!("Enter your choice: ");

        let mut choice = String::new();
        stdin().read_line(&mut choice).unwrap();

        let choice: u32 = match choice.trim().parse() {
            Ok(num) => num,
            Err(_) => {
                println!("Invalid input. Please enter a number.");
                continue;
            }
        };

        match choice {
            1 => {
                println!("Enter task name: ");
                let mut name = String::new();
                stdin().read_line(&mut name).unwrap();
                let id = tasks.len() as u32 + 1;
                tasks.push(Task { id, name: name.trim().to_string() });
                println!("Task added successfully!");
            }
            2 => {
                if tasks.is_empty() {
                    println!("No tasks yet.");
                } else {
                    println!("Tasks:");
                    for task in &tasks {
                        println!("  ID: {}  Name: {}", task.id, task.name);
                    }
                }
            }
            3 => {
                println!("Enter task ID to delete: ");
                let mut id = String::new();
                stdin().read_line(&mut id).unwrap();
                let id: u32 = match id.trim().parse() {
                    Ok(num) => num,
                    Err(_) => {
                        println!("Invalid ID. Please enter a valid number.");
                        continue;
                    }
                };
                let before = tasks.len();
                tasks.retain(|task| task.id != id);
                if tasks.len() < before {
                    println!("Task deleted successfully!");
                } else {
                    println!("No task found with that ID.");
                }
            }
            4 => {
                println!("Exiting...");
                break;
            }
            _ => {
                println!("Invalid choice. Please enter 1, 2, 3, or 4.");
            }
        }
    }
}

struct Task {
    id: u32,
    name: String,
}

stdin().read_line(&mut variable).unwrap();

let id = tasks.len() as u32 + 1;
tasks.push(Task { id, name: name.trim().to_string() });

for task in &tasks {
    println!("  ID: {}  Name: {}", task.id, task.name);
}

tasks.retain(|task| task.id != id);

let choice: u32 = match choice.trim().parse() {
    Ok(num) => num,
    Err(_) => {
        println!("Invalid input. Please enter a number.");
        continue;
    }
};

cargo run