Extracted core indexing logic, state tracking, and metadata management into a new `obikindex` crate. Refactored the `index` and `unitig` commands to leverage the `KmerIndex` abstraction and state-driven pipeline transitions. Removed obsolete CLI subcommands (`count`, `fasta`, `longtig`, `partition`) and their associated pipeline steps. Updated FASTA writing utilities for single-line output and deterministic identifiers, and refreshed workspace dependencies.
Centralize k-mer and minimizer configuration using a thread-safe global module, and replace manual bit-packing with a memory-efficient `PackedSeq` type. Refactor core sequence and k-mer types to use compile-time length enforcement and centralized hashing. Introduce a new De Bruijn graph implementation with compact node encoding and traversal iterators. Update I/O, partitioning, and builder modules to align with the new architecture, and add the `xxhash-rust` dependency.
- Refactored Node representation using compact bitfields for neighbor counts
and nucleotides; added count_neighbors helper to compute_degrees()
- Introduced StartIter iterator for unitig/longtigu generation with revised
traversal semantics (e.g., interior node marking)
- Added nucleotide() accessor to Kmer type for 2-bit extraction at position i
- Renamed unitig.rs → longtigs, updated CLI command and output filenames to reflect "long t ig"
- Extended extract_kmers() in scripts/compare.py with duplication statistics
```
Refactors the `start_iter` function to separate chain/cycle detection into two passes, consolidates visited marking logic internally in `next_unitig_kmer`, and streamlines the public API by removing redundant methods, updating iteration parameters to `(start_first_next)`, and eliminating external state like `at_start`.
Refactor core types to consistently use `CanonicalKMer` (lexicographically minimal of k-mer and its reverse complement) as the canonical representation, ensuring deterministic behavior in graph traversal (unitig decomposition), neighbor resolution (`unique_neighbor` with `[CanonicalKmer; 4]` input) and scatter output generation. Introduce `RoutableSuperKmer`, add `.seq_hash()` support, fix type syntax errors in unitig extraction methods and deduplication tests. Update all k-mer construction to use canonical-aware APIs, including unsafe unchecked constructors for performance-critical paths.
Eric Coissac