Function atom_from_attrs

crates/csskit_derives/src/feature_metadata.rs:6–11

Reads `#[feature_metadata(CssAtomSet::Foo)]` from the type's attributes.

(attrs: &[syn::Attribute])

/// Reads `#[feature_metadata(CssAtomSet::Foo)]` from the type's attributes.
pub(crate) fn atom_from_attrs(attrs: &[syn::Attribute]) -> Option<Path> {
	attrs.iter().find(|a| a.path().is_ident("feature_metadata")).and_then(|attr| match &attr.meta {
		Meta::List(meta) => meta.parse_args::<Path>().ok(),
		_ => None,
	})
}

pub fn derive(input: DeriveInput) -> Result<TokenStream> {
	let atom = atom_from_attrs(&input.attrs).ok_or_else(|| {