Test `git2::Repository::revparse_single()`

main.rs

use std::path::Path;

fn main() {
    use git2::Repository;

    let url = "https://github.com/not-an-aardvark/every-git-commit-shorthash.git";
    let repo_dir = Path::new("./target/every-git-commit-shorthash");

    let repo = if repo_dir.exists() {
        if repo_dir.is_dir() {
            match Repository::open(repo_dir.to_string_lossy().as_ref()) {
                Ok(repo) => repo,
                Err(e) => panic!("failed to open: {}", e),
            }
        } else {
            panic!(
                "{} exists but is not a directory",
                repo_dir.to_string_lossy()
            );
        }
    } else {
        match Repository::clone(url, repo_dir.to_string_lossy().as_ref()) {
            Ok(repo) => repo,
            Err(e) => panic!("failed to clone: {}", e),
        }
    };

    let id = "0000000";
    println!(r#"revparse_single("{}") => {:?}"#, id, repo.revparse_single(id));
    // output: revparse_single("0000000") => Err(Error { code: -5, klass: 9, message: "ambiguous OID prefix - found multiple offsets for pack entry" })

    let id = "00000002b";
    println!(r#"revparse_single("{}") => {:?}"#, id, repo.revparse_single(id));
    // output: revparse_single("00000002b") => Ok(Object { kind: Commit, id: 00000002bdd056473559d2bd0eb835561b3c874b })

    let id = "00000002f";
    println!(r#"revparse_single("{}") => {:?}"#, id, repo.revparse_single(id));
    // output: revparse_single("00000002f") => Ok(Object { kind: Commit, id: 00000002f7c605501165ee5e3c2db20ffe178848 })
}