如何递归地监视Rust中的文件更改？

[dependencies]
walkdir = "2.3"

use std::path::Path;
use walkdir::WalkDir;
use std::time::SystemTime;
use std::thread;
use std::time::Duration;

fn watch_files(directory: &Path) {
    for entry in WalkDir::new(directory).into_iter().filter_map(|e| e.ok()) {
        let path = entry.path();
        if path.is_file() {
            let modified_time = entry.metadata().unwrap().modified().unwrap();
            // 在这里可以进行你的逻辑处理，比如打印文件路径或执行其他操作
            println!("File {:?} modified at {:?}", path, modified_time);
        }
    }
}

fn main() {
    let directory = Path::new("/path/to/directory"); // 替换为你要监视的目录路径
    loop {
        watch_files(directory);
        thread::sleep(Duration::from_secs(1)); // 每秒钟检查一次文件更改
    }
}