Function find_matching_recursively_in_dir 

pub fn find_matching_recursively_in_dir(
    dir: &Path,
    matching_file_fn: impl Fn(&DirEntry) -> bool,
    skip_dir_fn: impl Fn(&DirEntry) -> bool,
) -> Result<Vec<PathBuf>>

Recursively find files matching a predicate (breadth-first)

Performs a breadth-first traversal starting at dir, skipping directories for which skip_dir_fn returns true, and collecting file paths for which matching_file_fn returns true.

Errors

• A directory cannot be read.
• File type metadata for an entry cannot be determined.
• Any underlying filesystem I/O error occurs during traversal.

Performance

Uses an in-memory queue (BFS). For extremely deep trees consider a streaming iterator variant; current implementation favors simplicity over incremental output.

Future Work

• Provide an iterator adapter (impl Iterator<Item = PathBuf>), avoiding collecting all results.
• Optional parallel traversal behind a feature flag for large repositories.