使用“clap”在 Rust CLI 工具中设置布尔标志

Question

我正在尝试使用一个 CLI 工具来根据某些指定的正则表达式编辑文件夹中的文件。

在调试时，举个例子：

cargo run -- folder ./tests/test_files -t emails ip -r

这意味着编辑文件夹 path = 中的所有文件，./tests/test_files并且-r意味着递归地执行此操作。

下面是尝试实现此目的的结构列表：

use clap::{Parser, Subcommand, Args};

#[derive(Debug, Parser)]
#[clap(author, version, about, name = "raf")]
pub struct Opts {
    #[clap(subcommand)]
    pub cmd: FileOrFolder,
}

#[derive(Debug, Subcommand)]
pub enum FileOrFolder {
    #[clap(name = "folder")]
    Folder(FolderOpts),
    #[clap(name = "file")]
    File(FileOpts),
}

#[derive(Args, Debug)]
pub struct FolderOpts {
    /// `path` of the directory in which all files should be redacted, e.g. ./tests/test_files
    #[clap(parse(from_os_str), required = true)]
    pub path: std::path::PathBuf,

    /// The type of redaction to be applied to the files, e.g. -t sgNRIC emails
    #[clap(short, long, required = true, multiple_values = true)]
    pub types: Vec<String>,

    #[clap(short, long, required = false, takes_value = false)]
    pub recursive: Option<bool>,
}

这是运行时发生的错误：

Finished dev [unoptimized + debuginfo] target(s) in 45.31s
     Running `target\debug\raf.exe folder ./tests/test_files -t sgNRIC email -r`
error: The argument '--recursive <RECURSIVE>' requires a value but none was supplied

For more information try --help
error: process didn't exit successfully: `target\debug\raf.exe folder ./tests/test_files -t sgNRIC email -r` (exit code: 2)

我的问题是，如何编写结构，FolderOpts以便如果-r作为 CLI 参数中的参数出现，则将其解析为.recursive= true，如果不存在，则将其解析为.recursive= false？

Answer 1

bool选项不需要包含在其中Option即可成为可选。如果它们的名称作为参数传递false，则它们默认设置为。true这应该有效：

#[clap(short, long)]
pub recursive: bool,