# cargo watch使用

cargo install cargo-watch

每当对代码进行更改时，通过在后台自动生成项目，cargo-watch可以有助于缩短修复、编译和运行周期。

默认情况下，该工具只运行Rust的**类型检查器**(cargo check命令)，而不进行代码生成阶段(这需要时间)，便缩短了编译时间；还可以使用**-x flag** 提供一个定制命令来代替cargo check。

一般用于微服务或者本地调试。

cargo watch -q -c -w src -x run

-w 检测watch

-c Change working directory before running command \[default: crate root]

-q Suppress output from cargo-watch itself

-x Cargo command(s) to execute on changes \[default: check]

框架warp：<https://github.com/seanmonstar/warp>

main代码

```rust
use warp::Filter;

#[tokio::main]
async fn main() {
    // GET /hello/warp => 200 OK with body "Hello, warp!"
    let hello = warp::path!("hello1" / String)
        .map(|name| format!("Hello, {}!", name));

    warp::serve(hello)
        .run(([127, 0, 0, 1], 3030))
        .await;
}
```

cargo.toml

```toml
[package]
name = "warp-server"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
warp = "0.3"
tokio = {version = "1", features = ["full"] }

```