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|
use std::{
path::PathBuf,
thread,
fs,
};
use crossbeam_channel::{Sender, Receiver, bounded};
use drop_bomb::DropBomb;
use walkdir::WalkDir;
use Result;
pub struct FileEvent {
pub path: PathBuf,
pub kind: FileEventKind,
}
pub enum FileEventKind {
Add(String),
#[allow(unused)]
Remove,
}
pub struct Watcher {
thread: thread::JoinHandle<()>,
bomb: DropBomb,
}
impl Watcher {
pub fn stop(mut self) -> Result<()> {
self.bomb.defuse();
self.thread.join()
.map_err(|_| format_err!("file watcher died"))
}
}
pub fn watch(roots: Vec<PathBuf>) -> (Receiver<Vec<FileEvent>>, Watcher) {
let (sender, receiver) = bounded(16);
let thread = thread::spawn(move || run(roots, sender));
(receiver, Watcher {
thread,
bomb: DropBomb::new("Watcher should be stopped explicitly"),
})
}
fn run(roots: Vec<PathBuf>, sender: Sender<Vec<FileEvent>>) {
for root in roots {
let mut events = Vec::new();
for entry in WalkDir::new(root.as_path()) {
let entry = match entry {
Ok(entry) => entry,
Err(e) => {
warn!("watcher error: {}", e);
continue;
}
};
if !entry.file_type().is_file() {
continue;
}
let path = entry.path();
if path.extension().and_then(|os| os.to_str()) != Some("rs") {
continue;
}
let text = match fs::read_to_string(path) {
Ok(text) => text,
Err(e) => {
warn!("watcher error: {}", e);
continue;
}
};
events.push(FileEvent {
path: path.to_owned(),
kind: FileEventKind::Add(text),
})
}
sender.send(events)
}
}
|
