recutils-rs

Rust FFI bindings to GNU recutils (librec).

The crate has two layers:

• A raw unsafe FFI under recutils_rs::ffi, generated at build time by bindgen from <rec.h> — covers the full rec_* / REC_* / MSET_* surface.
• A small safe wrapper at the crate root: Db (parse + construct empty), Rset (borrowed from a parsed Db), OwnedRset (freshly built, transferred into a Db via Db::append_rset), Record, SelectionExpression, etc.

The optional arrow feature covers both directions: rec_to_record_batch reads an rset into Arrow, and record_batches_to_rec_string serializes Arrow batches back to rec text with %rec: / %type: / %mandatory: declarations derived from the schema.

Status

The raw FFI is complete; the safe layer is intentionally minimal to what's needed in recsql and rec2parquet.