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https://github.com/TeXitoi/structopt

Parse command line arguments by defining a struct.
https://github.com/TeXitoi/structopt

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Parse command line arguments by defining a struct.

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# StructOpt



[![Build status](https://travis-ci.com/TeXitoi/structopt.svg?branch=master)](https://app.travis-ci.com/github/TeXitoi/structopt) [![](https://img.shields.io/crates/v/structopt.svg)](https://crates.io/crates/structopt) [![](https://docs.rs/structopt/badge.svg)](https://docs.rs/structopt)

[![unsafe forbidden](https://img.shields.io/badge/unsafe-forbidden-success.svg)](https://github.com/rust-secure-code/safety-dance/)



Parse command line arguments by defining a struct.  It combines [clap](https://crates.io/crates/clap) with custom derive.



## Maintenance



As clap v3 is now out, and the structopt features are integrated into (almost as-is), structopt is now in maintenance mode: no new feature will be added.



Bugs will be fixed, and documentation improvements will be accepted.



See the [structopt -> clap migration guide](https://github.com/clap-rs/clap/blob/master/CHANGELOG.md#migrating)



## Documentation



Find it on [Docs.rs](https://docs.rs/structopt).  You can also check the [examples](https://github.com/TeXitoi/structopt/tree/master/examples) and the [changelog](https://github.com/TeXitoi/structopt/blob/master/CHANGELOG.md).



## Example



Add `structopt` to your dependencies of your `Cargo.toml`:

```toml

[dependencies]

structopt = "0.3"

```



And then, in your rust file:

```rust

use std::path::PathBuf;

use structopt::StructOpt;



/// A basic example

#[derive(StructOpt, Debug)]

#[structopt(name = "basic")]

struct Opt {

    // A flag, true if used in the command line. Note doc comment will

    // be used for the help message of the flag. The name of the

    // argument will be, by default, based on the name of the field.

    /// Activate debug mode

    #[structopt(short, long)]

    debug: bool,



    // The number of occurrences of the `v/verbose` flag

    /// Verbose mode (-v, -vv, -vvv, etc.)

    #[structopt(short, long, parse(from_occurrences))]

    verbose: u8,



    /// Set speed

    #[structopt(short, long, default_value = "42")]

    speed: f64,



    /// Output file

    #[structopt(short, long, parse(from_os_str))]

    output: PathBuf,



    // the long option will be translated by default to kebab case,

    // i.e. `--nb-cars`.

    /// Number of cars

    #[structopt(short = "c", long)]

    nb_cars: Option,



    /// admin_level to consider

    #[structopt(short, long)]

    level: Vec,



    /// Files to process

    #[structopt(name = "FILE", parse(from_os_str))]

    files: Vec,

}



fn main() {

    let opt = Opt::from_args();

    println!("{:#?}", opt);

}

```



Using this example:

```

$ ./basic

error: The following required arguments were not provided:

    --output 



USAGE:

    basic --output  --speed 



For more information try --help

$ ./basic --help

basic 0.3.0

Guillaume Pinot , others

A basic example



USAGE:

    basic [FLAGS] [OPTIONS] --output  [--] [file]...



FLAGS:

    -d, --debug      Activate debug mode

    -h, --help       Prints help information

    -V, --version    Prints version information

    -v, --verbose    Verbose mode (-v, -vv, -vvv, etc.)



OPTIONS:

    -l, --level ...     admin_level to consider

    -c, --nb-cars     Number of cars

    -o, --output       Output file

    -s, --speed         Set speed [default: 42]



ARGS:

    ...    Files to process

$ ./basic -o foo.txt

Opt {

    debug: false,

    verbose: 0,

    speed: 42.0,

    output: "foo.txt",

    nb_cars: None,

    level: [],

    files: [],

}

$ ./basic -o foo.txt -dvvvs 1337 -l alice -l bob --nb-cars 4 bar.txt baz.txt

Opt {

    debug: true,

    verbose: 3,

    speed: 1337.0,

    output: "foo.txt",

    nb_cars: Some(

        4,

    ),

    level: [

        "alice",

        "bob",

    ],

    files: [

        "bar.txt",

        "baz.txt",

    ],

}

```



## StructOpt rustc version policy



- Minimum rustc version modification must be specified in the [changelog](https://github.com/TeXitoi/structopt/blob/master/CHANGELOG.md) and in the [travis configuration](https://github.com/TeXitoi/structopt/blob/master/.travis.yml).

- Contributors can increment minimum rustc version without any justification if the new version is required by the latest version of one of StructOpt's dependencies (`cargo update` will not fail on StructOpt).

- Contributors can increment minimum rustc version if the library user experience is improved.



## License



Licensed under either of



- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or )

- MIT license ([LICENSE-MIT](LICENSE-MIT) or )



at your option.



### Contribution



Unless you explicitly state otherwise, any contribution intentionally submitted

for inclusion in the work by you, as defined in the Apache-2.0 license, shall be

dual licensed as above, without any additional terms or conditions.