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|
use std::{
fs::{self, File},
io::{self, BufRead, BufReader, Write},
sync::{Arc, Mutex},
thread,
};
#[derive(Debug, Clone)]
enum TaskStatus {
Pending,
Completed,
}
#[derive(Debug, Clone)]
struct Task {
id: usize,
description: String,
status: TaskStatus,
}
impl Task {
fn new(id: usize, description: String) -> Self {
Self {
id,
description,
status: TaskStatus::Pending,
}
}
fn mark_done(&mut self) {
self.status = TaskStatus::Completed;
}
fn to_string(&self) -> String {
format!(
"{}|{}|{}",
self.id,
self.description,
match self.status {
TaskStatus::Pending => "Pending",
TaskStatus::Completed => "Completed",
}
)
}
fn from_string(data: &str) -> Option<Self> {
let parts: Vec<&str> = data.split('|').collect();
if parts.len() != 3 {
return None;
}
let id = parts[0].parse().ok()?;
let description = parts[1].to_string();
let status = match parts[2] {
"Pending" => TaskStatus::Pending,
"Completed" => TaskStatus::Completed,
_ => return None,
};
Some(Self {
id,
description,
status,
})
}
}
#[derive(Debug)]
struct TaskManager {
tasks: Vec<Task>,
}
impl TaskManager {
fn new() -> Self {
Self { tasks: vec![] }
}
fn add_task(&mut self, description: String) {
let id = self.tasks.len() + 1;
let task = Task::new(id, description);
self.tasks.push(task);
}
fn mark_task_done(&mut self, id: usize) -> Result<(), String> {
match self.tasks.iter_mut().find(|t| t.id == id) {
Some(task) => {
task.mark_done();
Ok(())
}
None => Err(format!("Task with ID {} not found.", id)),
}
}
fn list_tasks(&self) {
for task in &self.tasks {
println!(
"ID: {}, Description: {}, Status: {:?}",
task.id, task.description, task.status
);
}
}
fn save_to_file(&self, filename: &str) -> io::Result<()> {
let mut file = File::create(filename)?;
for task in &self.tasks {
writeln!(file, "{}", task.to_string())?;
}
Ok(())
}
fn load_from_file(&mut self, filename: &str) -> io::Result<()> {
self.tasks.clear();
let file = File::open(filename)?;
let reader = BufReader::new(file);
for line in reader.lines() {
if let Ok(line) = line {
if let Some(task) = Task::from_string(&line) {
self.tasks.push(task);
}
}
}
Ok(())
}
}
fn add(x: i32, y: i32, z: i32) -> i32 {
x + y + z
}
fn main() {
let task_manager = Arc::new(Mutex::new(TaskManager::new()));
let xay = 5;
let yay = 6;
let x = xay + yay + add(xay, yay, 3);
let y = 2;
// let z = add(x, y);
let tm_clone = Arc::clone(&task_manager);
println!(
"tm_clone: {:?}, Arc::clone(&task_manager): {:?}",
tm_clone,
Arc::clone(&task_manager)
);
thread::spawn(move || {
let mut tm = tm_clone.lock().unwrap();
tm.add_task("Learn Rust".to_string());
tm.add_task("Build a project".to_string());
tm.list_tasks();
})
.join()
.unwrap();
let tm_clone = Arc::clone(&task_manager);
thread::spawn(move || {
let mut tm = tm_clone.lock().unwrap();
tm.mark_task_done(1)
.unwrap_or_else(|err| println!("{}", err));
tm.list_tasks();
})
.join()
.unwrap();
let tm_clone = Arc::clone(&task_manager);
thread::spawn(move || {
let mut tm = tm_clone.lock().unwrap();
let filename = "tasks.txt";
tm.save_to_file(filename).expect("Failed to save tasks");
tm.load_from_file(filename).expect("Failed to load tasks");
tm.list_tasks();
})
.join()
.unwrap();
}
|
