Rust 学完，想找些练手的项目，怎么办？可参考这个文章，列出的 15 个项目。

一、CLI Utilities

github

参考
lsd 项目地址

cargo.toml

[dependencies]
clap = "2"

main.rs

extern crate clap;use clap::{App, Arg};fn main() {let app = App::new("l").version("1.0.0").author("y").about("this is a l").arg(Arg::with_name("all").short("a").help("show all file and dir"),).arg(Arg::with_name("long").short("l").help("show file all info")).arg(Arg::with_name("FILE").multiple(true).default_value(".")).get_matches();let all = app.is_present("all");let long = app.is_present("long");let files: Vec<&str> = app.values_of("FILE").expect("not get any file").collect();println!("all: {}, long: {}, File: {:?}", all, long, files);
}

运行已经可以收到命令行参数了，如下：

# cargo run
all: false, long: false, File: ["."]# cargo run -- -a -l /tmp /etc
all: true, long: true, File: ["/tmp", "/etc"]

接下来读取某路径下的文件：

extern crate clap;use std::{fs::read_dir, path::Path};fn main() {let files = vec!["/Users"];for file in files {let path = Path::new(file);if path.is_dir() {println!("{} is a directory", file);let somes = read_dir(path).expect("not get this path");for some in somes {if let Ok(ref entry) = some {let name = entry.file_name().to_str().expect("file name convert str fail").to_string();let data = entry.metadata().expect("no metadata");println!("{} {:?}", name, data)}}}}
}

接下来把两个程序结合：

extern crate clap;use clap::{App, Arg};
use std::fs::read_dir;
use std::os::unix::fs::PermissionsExt;
use std::path::Path;#[derive(Debug)]
pub struct Option {display_all: bool,display_long: bool,
}fn main() {let app = App::new("l").version("1.0.0").author("lome").about("this is a l").arg(Arg::with_name("all").short("a").help("Show all file and dir"),).arg(Arg::with_name("long").short("l").help("show file all info")).arg(Arg::with_name("FILE").multiple(true).default_value(".")).get_matches();let option = Option {display_all: app.is_present("all"),display_long: app.is_present("long"),};let files: Vec<&str> = app.values_of("FILE").expect("not get any file").collect();for file in files {let path = Path::new(file);if path.is_dir() {println!("{}: ", file);let somes = read_dir(path).expect("not get this path");for some in somes {if let Ok(ref entry) = some {let name = entry.file_name().to_str().expect("file name convert str fail").to_string();let data = entry.metadata().expect("no metadata");if option.display_long {if option.display_all || !name.starts_with(".") {let permission = data.permissions().mode();let systime = data.modified().expect("get system time error");println!("    {} Permission: {:o}  Systime: {:?}",name, permission, systime);}} else {if option.display_all || !name.starts_with(".") {println!("    {}", name);}}}}}}
}// code result:
Output：
$ ./l  ./test/ ./test/test/
./test/: test.txttest
./test/test/: test.txt$ ./l -a ./test/ ./test/test/
./test/: test.txttest.test.txt
./test/test/: test.txt$ ./l -al ./test/ ./test/test/
./test/: test.txt Permission: 100644  Systime: SystemTime { tv_sec: 1573805933, tv_nsec: 470337261 }test Permission: 40755  Systime: SystemTime { tv_sec: 1573805940, tv_nsec: 228706396 }.test.txt Permission: 100644  Systime: SystemTime { tv_sec: 1573806564, tv_nsec: 333715123 }
./test/test/: test.txt Permission: 100644  Systime: SystemTime { tv_sec: 1573805940, tv_nsec: 228706396 }