M1 R6: ahead_behind via gix reachable-set diff (qwen2.5-coder:32b)#9
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src/repo/ahead_behind.rs — `ahead_behind(path, upstream) -> Result<(usize,usize)>` returns (ahead, behind) commit counts of HEAD vs an upstream. gix 0.70's rev-walk has no built-in exclusion, so it collects each side's reachable set and diffs them (ahead = upstream..HEAD, behind = HEAD..upstream); `(0,0)` on unresolvable revs. Registered + PyO3 wrapper. Parity-tested vs the two `git rev-list --count` calls on a diverged history (real bare remote). PROVENANCE: implementation + tests written by the local model qwen2.5-coder:32b, driven headlessly through `newt worker` (newt-agent's ACP worker) by the pilot, which applied the module registration + PyO3 wrapper wiring and any clippy fixups. Co-Authored-By: qwen2.5-coder:32b <model@newt.local> Model: qwen2.5-coder:32b Piloted-by: newt-agent Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
src/repo/ahead_behind.rs —
ahead_behind(path, upstream) -> Result<(usize,usize)>returns (ahead, behind) commit counts of HEAD vs an upstream. gix 0.70's rev-walk has no built-in exclusion, so it collects each side's reachable set and diffs them (ahead = upstream..HEAD, behind = HEAD..upstream);(0,0)on unresolvable revs. Registered + PyO3 wrapper. Parity-tested vs the twogit rev-list --countcalls on a diverged history (real bare remote).Implementation + parity tests written by qwen2.5-coder:32b via
newt worker(newt-agent's ACP worker), piloted. Provenance is in the commit trailers
(
Model:/Co-Authored-By:).Test plan
cargo test --no-default-features— parity tests vs thegitCLI, green.cargo clippy --no-default-features --all-targets -- -D warnings— clean.cargo clippy --features extension-module -- -D warnings— clean.cargo fmt --all --check— clean.