todo.mjs

import { throws } from "assert";
import { Command } from "commander";
import fs from "fs";
import { json } from "stream/consumers";

const program = new Command();
let count = 0;

function readData() {
    const data = fs.readFileSync("todos.json", "utf-8");
    return JSON.parse(data);
}

program
    .name("todo-list")
    .description("CLI command to manage a todo list")
    .version("0.0.1");

program
    .command("add")
    .description("Add an item to todo list")
    .argument("<string>", "Name of the item")
    .action((str, options) => {
        const todo = {
            id: count++,
            item: str,
        };
        const todos = readData();
        todos.push(todo);
        const jsonTodo = JSON.stringify(todos, null, 4);
        fs.writeFile("todos.json", jsonTodo, "utf-8", (err) => {
            console.log("Task added successfully!");
        });
    });

program
    .command("remove")
    .description("Removes an item from todo")
    .argument("<string>", "Item to remove")
    .action((str, options) => {
        let todos = readData();
        todos = todos.filter((todo) => todo["item"] !== str);
        const jsonTodo = JSON.stringify(todos);
        fs.writeFile("todos.json", jsonTodo, "utf-8", (err) => {
            console.log("Task removed successfully!");
        });
    });

program
    .command("update")
    .description("Updates an existing task")
    .argument("<old>", "Write name of previous item \nEg. 'meeting at 4'")
    .argument("<new>", "Write updated one \nEg. 'meeting at 5'")
    .action((str1, str2) => {
        let todos = readData();
        todos.forEach((todo) => {
            if (todo["item"] === str1) {
                todo["item"] = str2;
            }
        });

        const jsonTodo = JSON.stringify(todos);
        fs.writeFile("todos.json", jsonTodo, "utf-8", (err) => {
            console.log("Task updated successfully!");
        });
    });

program
    .command('read')
    .description('Displays the todo list')
    .action(() => {
        const todos = readData();
        todos.forEach(todo => {
            console.log(todo.item);
        })
    })

program.parse();