Function get_sole_artifact

crates/spirv-builder/src/lib.rs:764–792

(out: &str)

const ARTIFACT_SUFFIX: &str = ".spv.json";

fn get_sole_artifact(out: &str) -> Option<PathBuf> {
    let last = out
        .lines()
        .filter_map(|line| {
            if let Ok(line) = serde_json::from_str::<RustcOutput>(line) {
                Some(line)
            } else {
                // Pass through invalid lines
                println!("{line}");
                None
            }
        })
        .filter(|line| line.reason == "compiler-artifact")
        .last()
        .expect("Did not find output file in rustc output");

    let mut filenames = last
        .filenames
        .unwrap()
        .into_iter()
        .filter(|v| v.ends_with(ARTIFACT_SUFFIX));
    let filename = filenames.next()?;
    assert_eq!(
        filenames.next(),
        None,
        "build had multiple `{ARTIFACT_SUFFIX}` artifacts"
    );
    Some(filename.into())
}

/// Internally iterate through the leaf dependencies of the artifact at `artifact`
fn leaf_deps(artifact: &Path, mut handle: impl FnMut(&RawStr)) -> std::io::Result<()> {