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|
use std::{
error::Error,
io::{stdout, Stdout, Write},
time::Duration,
};
use crossterm::{
cursor::MoveTo,
style::{Color, Print, SetForegroundColor},
terminal::{
self, disable_raw_mode, enable_raw_mode, Clear, ClearType, EnterAlternateScreen,
LeaveAlternateScreen,
},
ExecutableCommand, QueueableCommand,
};
use tokio::{
spawn,
sync::mpsc::{channel, Receiver, Sender},
time::Instant,
};
use crate::{
event::{handle_input, Event},
state::State,
};
pub const TICK_RATE: u64 = 1000 / 20;
pub struct App {
stdout: Stdout,
pub event_tx: Sender<Event>,
event_rx: Receiver<Event>,
running: bool,
quote: Vec<String>,
state: State,
should_render: bool,
start: Option<Instant>,
completed: bool,
}
impl App {
pub fn new(quote: String) -> App {
let (event_tx, event_rx): (Sender<Event>, Receiver<Event>) = channel(10);
App {
stdout: stdout(),
quote: quote
.split_whitespace()
.filter(|s| !s.is_empty())
.map(|s| s.to_string())
.collect(),
event_rx,
event_tx,
running: false,
state: State::default(),
should_render: true,
start: None,
completed: false,
}
}
pub async fn run(&mut self) -> Result<(), Box<dyn Error>> {
self.stdout.execute(EnterAlternateScreen)?;
enable_raw_mode()?;
let (input_ks_tx, input_ks_rx): (Sender<()>, Receiver<()>) = channel(1);
let (tick_ks_tx, tick_ks_rx): (Sender<()>, Receiver<()>) = channel(1);
spawn(start_input_handler(self.event_tx.clone(), input_ks_rx));
spawn(start_tick_generator(self.event_tx.clone(), tick_ks_rx));
self.running = true;
self.start = Some(Instant::now());
while self.running {
self.process().await?;
}
let time = self.start.unwrap().elapsed().as_millis();
let total_chars = self
.quote
.iter()
.map(|w| w.chars().count() as f64)
.sum::<f64>()
+ self.quote.len() as f64
- 1.0;
let wpm = total_chars / 5.0 * 60000.0 / time as f64;
input_ks_tx.send(()).await?;
tick_ks_tx.send(()).await?;
disable_raw_mode()?;
self.stdout.execute(LeaveAlternateScreen)?;
if self.completed {
println!("Your WPM: {}", wpm.round());
}
return Ok(());
}
async fn process(&mut self) -> Result<(), Box<dyn Error>> {
let event = self.event_rx.recv().await.unwrap();
match event {
Event::Terminate => {
self.running = false;
}
Event::KeyPress(k) => self.handle_keypress(k).await?,
Event::Backspace => self.handle_backspace().await,
Event::Render => self.render().await?,
Event::ForceRender => {
self.should_render = true;
self.render().await?;
}
}
if event != Event::Render {
self.should_render = true;
}
return Ok(());
}
async fn handle_keypress(&mut self, k: char) -> Result<(), Box<dyn Error>> {
self.state.buffer.push(k);
if self.state.buffer[..self.state.buffer.len() - 1] == self.quote[self.state.current]
&& k == ' '
{
self.state.buffer.clear();
self.state.current += 1;
} else if self.state.buffer == self.quote[self.state.current]
&& self.state.current == self.quote.len() - 1
{
self.running = false;
self.completed = true;
}
return Ok(());
}
async fn handle_backspace(&mut self) {
if !self.state.buffer.is_empty() {
self.state.buffer.pop();
}
}
async fn render(&mut self) -> Result<(), Box<dyn Error>> {
if !self.should_render {
return Ok(());
}
let (col, _) = terminal::size()?;
self.stdout
.queue(Clear(ClearType::All))
.unwrap()
.queue(SetForegroundColor(Color::Green))
.unwrap()
.queue(MoveTo(0, 0))
.unwrap();
let done = self.quote[..self.state.current].join(" ");
self.stdout.queue(Print(&done))?;
if done.chars().count() > 0 {
self.stdout.queue(Print(" "))?;
}
let mut cur_loc = done.chars().count() + self.state.buffer.len();
if cur_loc > 0 {
cur_loc += 1;
}
for i in 0..self.state.buffer.len() {
if i >= self.quote[self.state.current].len() {
break;
}
let c = self.quote[self.state.current].chars().nth(i).unwrap();
if self.state.buffer.chars().nth(i).unwrap() == c {
self.stdout.queue(SetForegroundColor(Color::Green)).unwrap();
} else {
self.stdout.queue(SetForegroundColor(Color::Red)).unwrap();
}
self.stdout.queue(Print(&c))?;
}
if self.state.buffer.len() < self.quote[self.state.current].len() {
self.stdout.queue(SetForegroundColor(Color::Reset)).unwrap();
let v = &self.quote[self.state.current][self.state.buffer.len()..];
self.stdout.queue(Print(&v))?;
} else if self.state.buffer.len() > self.quote[self.state.current].len() {
self.stdout
.queue(SetForegroundColor(Color::Yellow))
.unwrap();
let v = &self.state.buffer[self.quote[self.state.current].len()..];
self.stdout.queue(Print(&v))?;
}
self.stdout.queue(Print(" "))?;
self.stdout.queue(SetForegroundColor(Color::Reset)).unwrap();
let to_do = self.quote[self.state.current + 1..].join(" ");
self.stdout.queue(Print(&to_do))?.queue(Print("\n"))?;
self.stdout
.queue(MoveTo(cur_loc as u16 % col, cur_loc as u16 / col))?;
self.stdout.flush()?;
self.should_render = false;
return Ok(());
}
}
async fn start_tick_generator(ev: Sender<Event>, mut kill_switch: Receiver<()>) {
loop {
tokio::select! {
_ = async {
tokio::time::sleep(Duration::from_millis(TICK_RATE)).await;
ev.send(Event::Render).await
} => (),
_ = kill_switch.recv() => return,
}
}
}
async fn start_input_handler(ev: Sender<Event>, mut kill_switch: Receiver<()>) {
loop {
tokio::select! {
_ = handle_input(&ev) => (),
_ = kill_switch.recv() => return,
}
}
}
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