//! Helper macro to extract and validate a revision selector.
//!
//! Replaces the repeated pattern of matching on ObjectSelector variants
//! and validating revision strings before use.

/// Extract a revision string from an optional ObjectSelector, applying
/// validation to revision names. OID hex strings are always safe.
///
/// Returns "HEAD" when selector is None.
///
/// Usage:
///   let revision = resolve_revision!(request.base);
///   let revision = resolve_revision!(request.base, "main");
#[macro_export]
macro_rules! resolve_revision {
    ($selector:expr) => {{
        match $selector.and_then(|s| s.selector) {
            Some($crate::pb::object_selector::Selector::Oid(oid)) => oid.hex,
            Some($crate::pb::object_selector::Selector::Revision(name)) => {
                $crate::sanitize::validate_revision(&name.revision)?;
                name.revision
            }
            None => "HEAD".into(),
        }
    }};
    ($selector:expr, $default:expr) => {{
        match $selector.and_then(|s| s.selector) {
            Some($crate::pb::object_selector::Selector::Oid(oid)) => oid.hex,
            Some($crate::pb::object_selector::Selector::Revision(name)) => {
                $crate::sanitize::validate_revision(&name.revision)?;
                name.revision
            }
            None => ($default).into(),
        }
    }};
}