clap_builder 4.6.6

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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_builder@4.6.6
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/clap_builder@4.6.6

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:cd9aa2a2831e72b7009a504549fc0b5201e61b3bbe334e824adbcf481beb46b2","contract":["Command builder creates commands with name, version, and about metadata","Arg builder adds positional and flag arguments with default actions","Command validates required arguments and returns MissingRequiredArgument error","Subcommands parse hierarchical command lines and expose nested matches","Arg with SetTrue action operates as a boolean toggle flag","Arg with default value supplies fallback when argument is omitted"],"goal":"verify pkg:cargo/clap_builder@4.6.6","kind":"HOW","packages":["pkg:cargo/clap_builder@4.6.6"],"schemaVersion":1},"contractCommand":["cargo","run","--offline"],"environment":{"arch":"x64","distro":"alpine","ecosystem":"cargo","libc":"musl","os":"linux","packageManager":"cargo","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/clap_builder@4.6.6"],"schemaVersion":1,"subject":"pkg:cargo/clap_builder@4.6.6","verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify pkg:cargo/clap_builder@4.6.6",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/clap_builder@4.6.6"
  ]
}

//! Clean-room verification sample for clap_builder.

pub use clap_builder::*;

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

fn main() {
    // 1. Command builder creates commands with name, version, and about metadata
    let cmd = Command::new("demo")
        .version("1.0.0")
        .about("A demonstration CLI tool");
    assert_eq!(cmd.get_name(), "demo");
    assert_eq!(cmd.get_version(), Some("1.0.0"));
    assert_eq!(cmd.get_about().map(|a| a.to_string()), Some("A demonstration CLI tool".to_string()));

    // 2. Arg builder adds positional and flag arguments with default actions
    let cmd = Command::new("testapp")
        .arg(Arg::new("name").required(true).index(1))
        .arg(Arg::new("verbose").short('v').long("verbose").action(ArgAction::Count))
        .arg(Arg::new("output").short('o').long("output").action(ArgAction::Set));

    let matches = cmd.try_get_matches_from(vec!["testapp", "alice", "-vvv", "-o", "result.txt"]).unwrap();
    assert_eq!(matches.get_one::<String>("name").map(|s| s.as_str()), Some("alice"));
    assert_eq!(matches.get_count("verbose"), 3);
    assert_eq!(matches.get_one::<String>("output").map(|s| s.as_str()), Some("result.txt"));

    // 3. Command validates required arguments and returns MissingRequiredArgument error
    let cmd = Command::new("testapp")
        .arg(Arg::new("name").required(true));
    let err = cmd.try_get_matches_from(vec!["testapp"]).unwrap_err();
    assert_eq!(err.kind(), clap_builder::error::ErrorKind::MissingRequiredArgument);

    // 4. Subcommands parse hierarchical command lines and expose nested matches
    let root = Command::new("git")
        .subcommand(
            Command::new("clone")
                .arg(Arg::new("repo").required(true))
        );
    let matches = root.try_get_matches_from(vec!["git", "clone", "https://example.com/repo.git"]).unwrap();
    let (sub_name, sub_matches) = matches.subcommand().unwrap();
    assert_eq!(sub_name, "clone");
    assert_eq!(sub_matches.get_one::<String>("repo").map(|s| s.as_str()), Some("https://example.com/repo.git"));

    // 5. Arg with SetTrue action operates as a boolean toggle flag
    let cmd = Command::new("flagtest")
        .arg(Arg::new("flag").long("dry-run").action(ArgAction::SetTrue));
    let matches = cmd.clone().try_get_matches_from(vec!["flagtest", "--dry-run"]).unwrap();
    assert_eq!(matches.get_flag("flag"), true);
    let matches_absent = cmd.try_get_matches_from(vec!["flagtest"]).unwrap();
    assert_eq!(matches_absent.get_flag("flag"), false);

    // 6. Arg with default value supplies fallback when argument is omitted
    let cmd = Command::new("deftest")
        .arg(Arg::new("port").long("port").default_value("8080"));
    let matches = cmd.try_get_matches_from(vec!["deftest"]).unwrap();
    assert_eq!(matches.get_one::<String>("port").map(|s| s.as_str()), Some("8080"));

    println!("All clap_builder contract assertions passed successfully.");
}