本期的每周一库带来的是一个十分有趣的cli小工具，rust下的cli进度条库 - pbr

先附上库的链接

github: Terminal progress bar for Rust
docs: Crate pbr

库的简介十分简单，这个库的灵感来自于golang的pb库

github页面上直接提供了示例代码帮助我们快速体验pbr的功能，三个例子分别是

简单用例
多进度条用例
文件拷贝进度条用例

下面我们来体验一下pbr库的使用，测试环境

Windows 10
cargo --version: cargo 1.45.0-nightly (9fcb8c1d2 2020-05-25)

首先我们在Cargo.toml文件中添加引用pbr = "1.0.3"

简单用例
main.rs代码，我们修改官方例子，使用time::Duration::from_millis(200)实现thread sleep功能

extern crate pbr;
use pbr::ProgressBar;use std::{thread, time};
fn main() {    let count = 1000;    let mut pb = ProgressBar::new(count);    let duration = time::Duration::from_millis(20);    pb.format("╢▌▌░╟");    for _ in 0..count {        pb.inc();        thread::sleep(duration);    }    pb.finish_print("done");}

使用命令cargo run运行结果如下

多进度条用例

我们适当修改一下官方的例子，去除掉warning

extern crate pbr;
use std::{thread};use pbr::MultiBar;use std::time::Duration;
fn main() {    let mb = MultiBar::new();    let count = 100;    mb.println("Application header:");
    let mut p1 = mb.create_bar(count);    let _ = thread::spawn(move || {        for _ in 0..count {            p1.inc();            thread::sleep(Duration::from_millis(100));        }        // notify the multibar that this bar finished.        p1.finish();    });
    mb.println("add a separator between the two bars");
    let mut p2 = mb.create_bar(count * 2);    let _ = thread::spawn(move || {        for _ in 0..count * 2 {            p2.inc();            thread::sleep(Duration::from_millis(100));        }        // notify the multibar that this bar finished.        p2.finish();    });
    // start listen to all bars changes.    // this is a blocking operation, until all bars will finish.    // to ignore blocking, you can run it in a different thread.    mb.listen();}

运行结果

以上就是本期的每周一库

ITPub博客

【每周一库】 pbr - Terminal progress bar for Rust

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