You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: watcher.rs
    path of file: ./repos/yaque/src
    
    the code of the file until where you have to start completion: //! Watcher implementations for specific events on the queue directory. This is the interface with
//! the `inotify` API.

use notify::event::{Event, EventKind, ModifyKind};
use notify::{RecommendedWatcher, Watcher};
use std::path::Path;
use std::sync::{Arc, Mutex};
use std::task::Waker;

// /// Watches for the creation of a given future file.
// fn file_creation_watcher<P>(path: P, waker: Arc<Mutex<Option<Waker>>>) -> RecommendedWatcher
// where
//     P: AsRef<Path>,
/
    
pub(crate) fn file_watcher(path: &Path, waker: Arc<Mutex<Option<Waker>>>) -> RecommendedWatcher {
    // Set up watcher:
    let mut watcher =
        notify::recommended_watcher(move |maybe_event: notify::Result<notify::Event>| {
            match maybe_event.expect("received error from watcher") {
                // When any modification in the file happens
                Event {
                    kind: EventKind::Modify(ModifyKind::Data(_)),
                    ..
                } => {
                    waker
                        .lock()
                        .expect("waker poisoned")
                        .take()
                        .map(|waker: Waker| waker.wake());
                }
                Event {
                    kind: EventKind::Remove(_),
                    ..
                } => {
                    log::debug!("file being watched was removed");
                }
                _ => {}
            }
        })
        .expect("could not create watcher");

    // Put watcher to run:
    watcher
        .watch(path, notify::RecursiveMode::NonRecursive)
        .expect("could not start watching file");

    watcher
}