用途

• 当从 cargo install 安装时，找到安装包所在的文件夹。

使用1（搜索本地包）

use package_own::parent_folder;

fn main() {
    println!("{:?}", parent_folder(""));
}

输出1（返回类型：std::path::PathBuf）

 # Your OS: Windows

 > "{%USERPROFILE%}\\.cargo\\registry\\src\\github.com-{random number}\\
    {Your package. Case of this library<package_own-(version)>}\\"

 # Your OS: Linux

 $ "{$home}/.cargo/registry/src/github.com-{random number}/
    {Your package. Case of this library<package_own-(version)>}/"

使用2（将任意路径添加到搜索包路径中）

use package_own::parent_folder;

fn main() {
    println!("{:?}", parent_folder("src/main.rs"));
}

输出2（返回类型：std::path::PathBuf）

 # Your OS: Windows

 > "{%USERPROFILE%}\\.cargo\\registry\\src\\github.com-{random number}\\
    {Your package. Case of this library<package_own-(version)>}\\src\\main.rs"

 # Your OS: Linux

 $ "{$home}/.cargo/registry/src/github.com-{random number}/
    {Your package. Case of this library<package_own-(version)>}/src/main.rs"