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Ed Page e5806830f3 fix: Don't panic when getting number of values
I was tempted to remove the exact-size nature.  Wouldn't be breaking
since it only panics but decided to go ahead and do this for now.

Fixes #3241
2022-01-03 11:53:59 -06:00
.github chore(gh): Automate release creation 2022-01-01 12:43:24 -06:00
assets docs: Add back in logo 2021-12-07 17:45:57 -06:00
benches fix: Be consistent on hide/hidden 2021-11-29 10:58:00 -06:00
clap_complete docs(complete): Fix imports in documentation 2022-01-02 21:10:18 +02:00
clap_complete_fig chore: Release 2021-12-31 14:35:02 -06:00
clap_derive fix(derive): Don't enit warnings 2022-01-03 11:35:34 -06:00
clap_generate chore: Release 2021-12-31 14:35:02 -06:00
clap_generate_fig chore: Release 2021-12-31 14:35:02 -06:00
docs docs: List out each API 2021-12-13 08:56:56 -06:00
examples docs(derive): Include name magic attribute 2022-01-03 06:33:53 -06:00
src fix: Don't panic when getting number of values 2022-01-03 11:53:59 -06:00
tests fix(derive): Don't enit warnings 2022-01-03 11:35:34 -06:00
.clippy.toml chore: Limit local clippy to MSRV like CI 2021-12-07 17:45:57 -06:00
.gitignore chore: Align on boilerplate 2021-11-17 15:24:50 -06:00
.pre-commit-config.yaml chore: Align on boilerplate 2021-11-17 15:24:50 -06:00
Cargo.toml chore: Release 2021-12-31 14:35:02 -06:00
CHANGELOG.md chore: Release 2021-12-31 14:35:02 -06:00
clap.schema.json feat(doc): Fix many typos in docs, comments and codes found by typos-cli 2021-10-19 10:38:22 +09:00
committed.toml chore: Align on boilerplate 2021-11-17 15:24:50 -06:00
CONTRIBUTING.md docs(contrib): Point out to other contribs 2021-12-07 20:52:27 -06:00
LICENSE-APACHE chore: relicense under MIT and APACHE 2.0 2018-07-23 14:25:18 -04:00
LICENSE-MIT chore: updates additional files for 2x release 2016-01-28 11:46:12 -05:00
Makefile chore(ci): Stop using all features 2021-12-08 20:37:53 -06:00
README.md chore: Release 2021-12-31 14:35:02 -06:00
release.toml chore: Configure release process 2021-12-07 21:36:00 -06:00
typos.toml docs: Fix typos 2021-11-17 15:21:58 -06:00

clap

Command Line Argument Parser for Rust

Crates.io Crates.io License License Build Status Coverage Status Contributors

Dual-licensed under Apache 2.0 or MIT.

  1. About
  2. Tutorial: Builder API, Derive API
  3. Examples
  4. API Reference
  5. CHANGELOG
  6. FAQ
  7. Questions & Discussions
  8. Contributing
  9. Sponsors

About

Create your command-line parser, with all of the bells and whistles, declaratively or procedurally.

Example

use clap::Parser;

/// Simple program to greet a person
#[derive(Parser, Debug)]
#[clap(about, version, author)]
struct Args {
    /// Name of the person to greet
    #[clap(short, long)]
    name: String,

    /// Number of times to greet
    #[clap(short, long, default_value_t = 1)]
    count: u8,
}

fn main() {
    let args = Args::parse();

    for _ in 0..args.count {
        println!("Hello {}!", args.name)
    }
}

Add this to Cargo.toml:

[dependencies]
clap = { version = "3.0.0", features = ["derive"] }
$ demo --help
clap [..]

A simple to use, efficient, and full-featured Command Line Argument Parser

USAGE:
    demo[EXE] [OPTIONS] --name <NAME>

OPTIONS:
    -c, --count <COUNT>    Number of times to greet [default: 1]
    -h, --help             Print help information
    -n, --name <NAME>      Name of the person to greet
    -V, --version          Print version information

(version number and .exe extension on windows replaced by placeholders)

Aspirations

  • Out of the box, users get a polished CLI experience
    • Including common argument behavior, help generation, suggested fixes for users, colored output, shell completions, etc
  • Flexible enough to port your existing CLI interface
    • However, we won't necessarily streamline support for each use case
  • Reasonable parse performance
  • Resilient maintainership, including
    • Willing to break compatibility rather than batching up breaking changes in large releases
    • Leverage feature flags to keep to one active branch
    • Being under WG-CLI to increase the bus factor
  • We follow semver and will wait about 6-9 months between major breaking changes
  • We will support the last two minor Rust releases (MSRV, currently 1.54.0)

While these aspirations can be at odds with fast build times and low binary size, we will still strive to keep these reasonable for the flexibility you get. Check out the argparse-benchmarks for CLI parsers optimized for other use cases.

Feature Flags

Default Features

  • std: Not Currently Used. Placeholder for supporting no_std environments in a backwards compatible manner.
  • color: Turns on colored error messages.
  • suggestions: Turns on the Did you mean '--myoption'? feature for when users make typos.

Optional features

  • derive: Enables the custom derive (i.e. #[derive(Parser)]). Without this you must use one of the other methods of creating a clap CLI listed above.
  • cargo: Turns on macros that read values from CARGO_* environment variables.
  • env: Turns on the usage of environment variables during parsing.
  • regex: Enables regex validators.
  • unicode: Turns on support for unicode characters (including emoji) in arguments and help messages.
  • wrap_help: Turns on the help text wrapping feature, based on the terminal size.

Experimental features

Warning: These may contain breaking changes between minor releases.

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