Support 'q', Esc and 'C-c' user inputs

src/main.rs

@@ -1,6 +1,11 @@
 use async_std::task;
 use clap::{App, Arg, ArgMatches, SubCommand};
-use crossterm::{cursor, terminal::Clear, terminal::ClearType, QueueableCommand};
+use crossterm::{
+    cursor,
+    event::{poll, read, Event, KeyCode, KeyEvent, KeyModifiers},
+    terminal::{disable_raw_mode, enable_raw_mode, Clear, ClearType},
+    QueueableCommand,
+};
 use domasi::pomodoro::{Alert, Clock, Config, Status};
 use domasi::Pomodoro;
 use std::io::{stdout, Write};
@@ -52,9 +57,9 @@ pub fn start(args: &ArgMatches) {
     let alert = Alert::new(&audio_path, &default_device);
     let mut pomodoro = Pomodoro::new(&alert);
 
-    task::block_on(async {
     let (tx, rx): (Sender<Status>, Receiver<Status>) = channel();
 
+    // UI Thread
     thread::spawn(move || loop {
         if let Ok(status) = rx.recv() {
             loop {
@@ -71,10 +76,24 @@ pub fn start(args: &ArgMatches) {
         }
     });
 
+    // User Input Thread
+    thread::spawn(|| {
+        setup_user_input().unwrap();
+    });
+
+    task::block_on(async {
         pomodoro.start(config, tx).await;
     });
 }
 
+fn setup_user_input() -> crossterm::Result<()> {
+    enable_raw_mode()?;
+
+    get_user_input()?;
+
+    disable_raw_mode()
+}
+
 fn print_overwrite(text: &str) {
     let mut stdout = stdout();
 
@@ -84,3 +103,31 @@ fn print_overwrite(text: &str) {
     stdout.queue(cursor::RestorePosition).unwrap();
     stdout.flush().unwrap();
 }
+
+fn get_user_input() -> crossterm::Result<()> {
+    loop {
+        if poll(Clock::get_polling_interval())? {
+            if let Event::Key(event) = read()? {
+                handle_key_event(event);
+            }
+        }
+    }
+}
+
+fn handle_key_event(event: KeyEvent) {
+    match event.code {
+        KeyCode::Char('c') => {
+            if let KeyModifiers::CONTROL = event.modifiers {
+                exit_domasi(1)
+            }
+        }
+        KeyCode::Esc | KeyCode::Char('q') => exit_domasi(0),
+        _ => {}
+    }
+}
+
+fn exit_domasi(code: i32) {
+    disable_raw_mode().unwrap();
+
+    std::process::exit(code);
+}