clap 4.6.4

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clap = "=4.6.4"

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:cargo/clap@4.6.4
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/clap@4.6.4

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:0e25afe050740ea87f7067548080f3226f03a8267e3fd3cf31f42525b6f0c797","contract":["clap::Command::try_get_matches_from parses short, long, counted, and positional arguments","clap::Arg::default_value supplies the fallback value when the option is omitted","clap::Command::try_get_matches_from returns Err when a required positional argument is missing"],"goal":"verify pkg:cargo/clap@4.6.4","kind":"HOW","packages":["pkg:cargo/clap@4.6.4"],"schemaVersion":1},"contractCommand":["cargo","run","--offline"],"environment":{"arch":"x64","ecosystem":"cargo","os":"linux","packageManager":"cargo","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/clap@4.6.4"],"schemaVersion":1,"subject":"pkg:cargo/clap@4.6.4","verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify pkg:cargo/clap@4.6.4",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/clap@4.6.4"
  ]
}

use clap::{Arg, ArgAction, Command};

fn build_cli() -> Command {
    Command::new("app")
        .version("1.0.0")
        .arg(
            Arg::new("config")
                .short('c')
                .long("config")
                .value_name("FILE")
                .default_value("default.toml"),
        )
        .arg(
            Arg::new("verbose")
                .short('v')
                .long("verbose")
                .action(ArgAction::Count),
        )
        .arg(
            Arg::new("input")
                .required(true)
                .index(1),
        )
}

fn verify_clap() {
    let matches = build_cli()
        .try_get_matches_from(["app", "-vv", "--config", "custom.toml", "data.txt"])
        .expect("valid arguments should parse");

    assert_eq!(
        matches.get_one::<String>("config").map(String::as_str),
        Some("custom.toml")
    );
    assert_eq!(matches.get_count("verbose"), 2);
    assert_eq!(
        matches.get_one::<String>("input").map(String::as_str),
        Some("data.txt")
    );

    let default_matches = build_cli()
        .try_get_matches_from(["app", "item.txt"])
        .expect("default arguments should parse");
    assert_eq!(
        default_matches.get_one::<String>("config").map(String::as_str),
        Some("default.toml")
    );
    assert_eq!(default_matches.get_count("verbose"), 0);

    let missing_required = build_cli().try_get_matches_from(["app"]);
    assert!(missing_required.is_err());
}

fn main() {
    verify_clap();
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn contract_clap_parsing() {
        verify_clap();
    }
}