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#![feature(box_syntax)]
extern crate notify;
extern crate parking_lot;
use std::collections::HashMap;
use std::path::{Path, PathBuf};
use std::sync::Arc;
use std::sync::mpsc::{channel, Receiver};
use std::time::Duration;
use parking_lot::Mutex;
use notify::{RecommendedWatcher, Watcher, RecursiveMode};
pub use notify::DebouncedEvent as Event;
fn path_from_event(e: &Event) -> Option<PathBuf> {
match e {
&Event::NoticeWrite(ref p) |
&Event::NoticeRemove(ref p) |
&Event::Create(ref p) |
&Event::Write(ref p) |
&Event::Chmod(ref p) |
&Event::Remove(ref p) |
&Event::Rename(ref p, _) => Some(p.clone()),
&_ => None
}
}
#[derive(Debug)]
pub enum Error {
Io(std::io::Error),
Notify(notify::Error)
}
type HotwatchResult<T> = Result<T, Error>;
type Handler = Box<Fn(Event) + Send>;
type HandlerMapMutex = Arc<Mutex<HashMap<String, Handler>>>;
pub struct Hotwatch {
watcher: RecommendedWatcher,
handler_map_mutex: HandlerMapMutex,
}
impl Hotwatch {
pub fn new() -> HotwatchResult<Self> {
let (tx, rx) = channel();
let handler_map_mutex = Arc::new(Mutex::new(HashMap::new()));
Hotwatch::run(handler_map_mutex.clone(), rx);
Watcher::new(tx, Duration::from_secs(2))
.map_err(Error::Notify)
.map(|watcher| Hotwatch {
watcher: watcher,
handler_map_mutex: handler_map_mutex,
})
}
pub fn watch<F>(&mut self, path: &str, handler: F) -> HotwatchResult<()>
where F: 'static + Fn(Event) + Send {
let mut handlers = self.handler_map_mutex.lock();
self.watcher.watch(Path::new(path), RecursiveMode::Recursive)
.map_err(|e| match e {
notify::Error::Io(e) => Error::Io(e),
_ => Error::Notify(e)
})
.map(|_| {
(*handlers).insert(path.to_string(), box handler);
})
}
fn run(handler_map_mutex: HandlerMapMutex, rx: Receiver<Event>) {
std::thread::spawn(move || {
loop {
match rx.recv() {
Ok(event) => {
if cfg!(debug_assertions) {
println!("Hotwatch {:?}", event);
}
let handlers = handler_map_mutex.lock();
if let Some(mut path) = path_from_event(&event) {
let mut handler = None;
let mut poppable = true;
while handler.is_none() && poppable {
if let Some(str_path) = path.to_str() {
handler = (*handlers).get(str_path);
}
poppable = path.pop();
}
if let Some(handler) = handler {
handler(event);
}
}
},
Err(e) => {
if cfg!(debug_assertions) {
println!("Receiver error: {:?}", e);
}
}
}
}
});
}
}