Add cli option to specify a download directory to save mp3 file #3

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opened 2023-07-25 08:01:53 +01:00 by kemitix · 0 comments

kemitix commented

2023-07-25 08:01:53 +01:00

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Defaults to the current directory.

-s

Aborts if the directory doesn't exist.

To accept a named parameter to specify a directory to download files into using the clap library in a Rust CLI program, you need to define the parameter in the Args struct and use the #[arg] attribute. Here is a step-by-step guide on how to achieve this:

You first need to add the clap dependency to your Cargo.toml file. Ensure you enable the derive feature which provides derive macros for argument parsing.

[dependencies]
clap = { version = "3.1.6", features = ["derive"] }

Source 7

Import the clap::Parser and define your Args struct. You can include a directory field to represent the directory to download files into. Use the #[arg] attribute to specify how this argument should be parsed. The short and long options specify the shorthand and full version of the argument flag respectively.

use clap::Parser;

#[derive(Parser, Debug)]
struct Args {
    #[arg(short, long)]
    directory: String,
}

Source 4

In your main function, you can parse the command line arguments into an Args instance. The parse method will automatically handle parsing the command line arguments, and will produce helpful error messages if the arguments are not provided correctly.

fn main() {
    let args = Args::parse();
    println!("Directory: {}", args.directory);
}

Source 7

Now you can run your program with the --directory (or -d for short) flag to specify the directory.

$ cargo run -- --directory /path/to/download/directory
Directory: /path/to/download/directory

Remember that the clap library automatically generates help messages for your CLI. You can view this help message with the --help flag:

$ cargo run -- --help

Source 7

This will give you a detailed explanation of the directory argument, along with any other arguments you've defined in your Args struct.

Defaults to the current directory. -s <directory> Aborts if the directory doesn't exist. To accept a named parameter to specify a directory to download files into using the `clap` library in a Rust CLI program, you need to define the parameter in the `Args` struct and use the `#[arg]` attribute. Here is a step-by-step guide on how to achieve this: 1. You first need to add the `clap` dependency to your `Cargo.toml` file. Ensure you enable the `derive` feature which provides derive macros for argument parsing. ```rust [dependencies] clap = { version = "3.1.6", features = ["derive"] } ``` [Source 7](https://blog.logrocket.com/command-line-argument-parsing-rust-using-clap/) 2. Import the `clap::Parser` and define your `Args` struct. You can include a `directory` field to represent the directory to download files into. Use the `#[arg]` attribute to specify how this argument should be parsed. The `short` and `long` options specify the shorthand and full version of the argument flag respectively. ```rust use clap::Parser; #[derive(Parser, Debug)] struct Args { #[arg(short, long)] directory: String, } ``` [Source 4](https://docs.rs/clap/latest/clap/) 3. In your `main` function, you can parse the command line arguments into an `Args` instance. The `parse` method will automatically handle parsing the command line arguments, and will produce helpful error messages if the arguments are not provided correctly. ```rust fn main() { let args = Args::parse(); println!("Directory: {}", args.directory); } ``` [Source 7](https://blog.logrocket.com/command-line-argument-parsing-rust-using-clap/) 4. Now you can run your program with the `--directory` (or `-d` for short) flag to specify the directory. ```bash $ cargo run -- --directory /path/to/download/directory Directory: /path/to/download/directory ``` Remember that the `clap` library automatically generates help messages for your CLI. You can view this help message with the `--help` flag: ```bash $ cargo run -- --help ``` [Source 7](https://blog.logrocket.com/command-line-argument-parsing-rust-using-clap/) This will give you a detailed explanation of the `directory` argument, along with any other arguments you've defined in your `Args` struct.