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|
use anyhow::{Error, Result};
use crossterm::event::{self, Event, KeyCode, KeyEventKind};
use notify_debouncer_mini::{
new_debouncer,
notify::{self, RecursiveMode},
DebounceEventResult, DebouncedEventKind,
};
use std::{
io::{self, Write},
path::Path,
sync::mpsc::{channel, Sender},
thread,
time::Duration,
};
mod state;
use crate::{exercise::Exercise, state_file::StateFile};
use self::state::WatchState;
/// Returned by the watch mode to indicate what to do afterwards.
pub enum WatchExit {
/// Exit the program.
Shutdown,
/// Enter the list mode and restart the watch mode afterwards.
List,
}
enum InputEvent {
Hint,
List,
Quit,
Unrecognized(String),
}
enum WatchEvent {
Input(InputEvent),
FileChange { exercise_ind: usize },
NotifyErr(notify::Error),
TerminalEventErr(io::Error),
TerminalResize,
}
struct DebounceEventHandler {
tx: Sender<WatchEvent>,
exercises: &'static [Exercise],
}
impl notify_debouncer_mini::DebounceEventHandler for DebounceEventHandler {
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 terminal_event_handler(tx: Sender<WatchEvent>) {
let mut input = String::with_capacity(8);
let last_input_event = loop {
let terminal_event = match event::read() {
Ok(v) => v,
Err(e) => {
// If `send` returns an error, then the receiver is dropped and
// a shutdown has been already initialized.
let _ = tx.send(WatchEvent::TerminalEventErr(e));
return;
}
};
match terminal_event {
Event::Key(key) => {
match key.kind {
KeyEventKind::Release => continue,
KeyEventKind::Press | KeyEventKind::Repeat => (),
}
match key.code {
KeyCode::Enter => {
let input_event = match input.trim() {
"h" | "hint" => InputEvent::Hint,
"l" | "list" => break InputEvent::List,
"q" | "quit" => break InputEvent::Quit,
_ => InputEvent::Unrecognized(input.clone()),
};
if tx.send(WatchEvent::Input(input_event)).is_err() {
return;
}
input.clear();
}
KeyCode::Char(c) => {
input.push(c);
}
_ => (),
}
}
Event::Resize(_, _) => {
if tx.send(WatchEvent::TerminalResize).is_err() {
return;
}
}
Event::FocusGained | Event::FocusLost | Event::Mouse(_) | Event::Paste(_) => continue,
}
};
let _ = tx.send(WatchEvent::Input(last_input_event));
}
pub fn watch(state_file: &mut StateFile, exercises: &'static [Exercise]) -> Result<WatchExit> {
let (tx, rx) = channel();
let mut debouncer = new_debouncer(
Duration::from_secs(1),
DebounceEventHandler {
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 || terminal_event_handler(tx));
while let Ok(event) = rx.recv() {
match event {
WatchEvent::Input(InputEvent::Hint) => {
watch_state.show_hint()?;
}
WatchEvent::Input(InputEvent::List) => {
return Ok(WatchExit::List);
}
WatchEvent::TerminalResize => {
watch_state.render()?;
}
WatchEvent::Input(InputEvent::Quit) => break,
WatchEvent::Input(InputEvent::Unrecognized(cmd)) => {
watch_state.handle_invalid_cmd(&cmd)?;
}
WatchEvent::FileChange { exercise_ind } => {
// TODO: bool
watch_state.run_exercise_with_ind(exercise_ind)?;
watch_state.render()?;
}
WatchEvent::NotifyErr(e) => {
return Err(Error::from(e).context("Exercise file watcher failed"))
}
WatchEvent::TerminalEventErr(e) => {
return Err(Error::from(e).context("Terminal event listener failed"))
}
}
}
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(WatchExit::Shutdown)
}
|
