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|
use anyhow::Result;
use notify_debouncer_mini::{
new_debouncer,
notify::{self, RecursiveMode},
DebounceEventResult, DebouncedEventKind,
};
use std::{
io::{self, BufRead, Write},
path::Path,
sync::mpsc::{channel, Sender},
thread,
time::Duration,
};
mod state;
use crate::{exercise::Exercise, state_file::StateFile};
use self::state::WatchState;
enum InputEvent {
Hint,
Clear,
Quit,
Unrecognized,
}
enum WatchEvent {
Input(InputEvent),
FileChange { exercise_ind: usize },
NotifyErr(notify::Error),
StdinErr(io::Error),
TerminalResize,
}
struct DebouceEventHandler {
tx: Sender<WatchEvent>,
exercises: &'static [Exercise],
}
impl notify_debouncer_mini::DebounceEventHandler for DebouceEventHandler {
fn handle_event(&mut self, event: DebounceEventResult) {
let event = match event {
Ok(event) => {
let Some(exercise_ind) = event
.iter()
.filter_map(|event| {
if event.kind != DebouncedEventKind::Any
|| !event.path.extension().is_some_and(|ext| ext == "rs")
{
return None;
}
self.exercises
.iter()
.position(|exercise| event.path.ends_with(&exercise.path))
})
.min()
else {
return;
};
WatchEvent::FileChange { exercise_ind }
}
Err(e) => WatchEvent::NotifyErr(e),
};
// An error occurs when the receiver is dropped.
// After dropping the receiver, the debouncer guard should also be dropped.
let _ = self.tx.send(event);
}
}
fn input_handler(tx: Sender<WatchEvent>) {
let mut stdin = io::stdin().lock();
let mut stdin_buf = String::with_capacity(8);
loop {
if let Err(e) = stdin.read_line(&mut stdin_buf) {
// If `send` returns an error, then the receiver is dropped and
// a shutdown has been already initialized.
let _ = tx.send(WatchEvent::StdinErr(e));
return;
}
let event = match stdin_buf.trim() {
"h" | "hint" => InputEvent::Hint,
"c" | "clear" => InputEvent::Clear,
"q" | "quit" => InputEvent::Quit,
_ => InputEvent::Unrecognized,
};
stdin_buf.clear();
if tx.send(WatchEvent::Input(event)).is_err() {
// The receiver was dropped.
return;
}
}
}
pub fn watch(state_file: &StateFile, exercises: &'static [Exercise]) -> Result<()> {
let (tx, rx) = channel();
let mut debouncer = new_debouncer(
Duration::from_secs(1),
DebouceEventHandler {
tx: tx.clone(),
exercises,
},
)?;
debouncer
.watcher()
.watch(Path::new("exercises"), RecursiveMode::Recursive)?;
let mut watch_state = WatchState::new(state_file, exercises);
// TODO: bool
watch_state.run_exercise()?;
watch_state.render()?;
thread::spawn(move || input_handler(tx));
while let Ok(event) = rx.recv() {
match event {
WatchEvent::Input(InputEvent::Hint) => {
watch_state.show_hint()?;
}
WatchEvent::Input(InputEvent::Clear) | WatchEvent::TerminalResize => {
watch_state.render()?;
}
WatchEvent::Input(InputEvent::Quit) => break,
WatchEvent::Input(InputEvent::Unrecognized) => {
watch_state.handle_invalid_cmd()?;
}
WatchEvent::FileChange { exercise_ind } => {
// TODO: bool
watch_state.run_exercise_with_ind(exercise_ind)?;
watch_state.render()?;
}
WatchEvent::NotifyErr(e) => return Err(e.into()),
WatchEvent::StdinErr(e) => return Err(e.into()),
}
}
watch_state.into_writer().write_all(b"
We hope you're enjoying learning Rust!
If you want to continue working on the exercises at a later point, you can simply run `rustlings` again.
")?;
Ok(())
}
|
