clap 4.6.7: clap::ArgAction

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[dependencies]
clap = "=4.6.7"

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 clap::ArgAction in pkg:cargo/clap@4.6.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/clap@4.6.7
Demonstrate these symbols/APIs:
  - clap::ArgAction

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:a64ce8d59c9b592125335f3cb3ef08ef158bb3330d830947c3cd4713140e7445","contract":["Arg::action(ArgAction::Set) stores a single string value accessible via ArgMatches::get_one::\u003cString\u003e","Arg::action(ArgAction::Append) accumulates multiple occurrences accessible via ArgMatches::get_many::\u003cString\u003e","Arg::action(ArgAction::SetTrue) and Arg::action(ArgAction::SetFalse) set boolean flags accessible via ArgMatches::get_flag","Arg::action(ArgAction::Count) counts occurrences of a flag accessible via ArgMatches::get_count"],"goal":"verify clap::ArgAction in pkg:cargo/clap@4.6.7","kind":"HOW","packages":["pkg:cargo/clap@4.6.7"],"schemaVersion":1,"symbols":["clap::ArgAction"]},"contractCommand":["cargo","test","--offline"],"environment":{"arch":"x64","ecosystem":"cargo","os":"linux","packageManager":"cargo","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/clap@4.6.7"],"schemaVersion":1,"subject":"pkg:cargo/clap@4.6.7","symbols":["clap::ArgAction"],"verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify clap::ArgAction in pkg:cargo/clap@4.6.7",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/clap@4.6.7"
  ],
  "symbols": [
    "clap::ArgAction"
  ]
}

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

fn main() {
    // 1. ArgAction::Set
    let cmd_set = Command::new("app")
        .arg(Arg::new("name").long("name").action(ArgAction::Set));
    let m_set = cmd_set.try_get_matches_from(["app", "--name", "item"]).unwrap();
    assert_eq!(m_set.get_one::<String>("name").map(|s| s.as_str()), Some("item"));

    // 2. ArgAction::Append
    let cmd_append = Command::new("app")
        .arg(Arg::new("tag").short('t').action(ArgAction::Append));
    let m_append = cmd_append
        .try_get_matches_from(["app", "-t", "one", "-t", "two"])
        .unwrap();
    let tags: Vec<&str> = m_append
        .get_many::<String>("tag")
        .unwrap()
        .map(|s| s.as_str())
        .collect();
    assert_eq!(tags, vec!["one", "two"]);

    // 3. ArgAction::SetTrue and ArgAction::SetFalse
    let cmd_bool = Command::new("app")
        .arg(Arg::new("verbose").long("verbose").action(ArgAction::SetTrue))
        .arg(Arg::new("color").long("no-color").action(ArgAction::SetFalse));
    let m_bool = cmd_bool
        .try_get_matches_from(["app", "--verbose", "--no-color"])
        .unwrap();
    assert!(m_bool.get_flag("verbose"));
    assert!(!m_bool.get_flag("color"));

    // 4. ArgAction::Count
    let cmd_count = Command::new("app")
        .arg(Arg::new("debug").short('d').action(ArgAction::Count));
    let m_count = cmd_count.try_get_matches_from(["app", "-ddd"]).unwrap();
    assert_eq!(m_count.get_count("debug"), 3);
}

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

#[test]
fn contract_arg_action() {
    let cmd = Command::new("app")
        .arg(Arg::new("name").long("name").action(ArgAction::Set))
        .arg(Arg::new("tag").short('t').action(ArgAction::Append))
        .arg(Arg::new("verbose").long("verbose").action(ArgAction::SetTrue))
        .arg(Arg::new("color").long("no-color").action(ArgAction::SetFalse))
        .arg(Arg::new("debug").short('d').action(ArgAction::Count));

    let m = cmd
        .try_get_matches_from(["app", "--name", "item", "-t", "a", "-t", "b", "--verbose", "--no-color", "-dd"])
        .unwrap();

    assert_eq!(m.get_one::<String>("name").map(|s| s.as_str()), Some("item"));
    let tags: Vec<&str> = m.get_many::<String>("tag").unwrap().map(|s| s.as_str()).collect();
    assert_eq!(tags, vec!["a", "b"]);
    assert!(m.get_flag("verbose"));
    assert!(!m.get_flag("color"));
    assert_eq!(m.get_count("debug"), 2);
}