Crate differential_engine 

Core engine: git io, diff parsing, byte-exact apply, shape classes, invariants, and plan-document assembly.

The canonical enumeration (git diff -U0 --no-renames) processes every file with no exclusions (ADR 0005); the rename-detected view (-M) only annotates it (ADR 0003). Repo config tunes classification hints and can never remove anything from enumeration (ADR 0012).

Re-exports

pub use grouping::GroupingOptions;

pub use pipeline::PipelineOutput;

pub use pipeline::resolve_range;

pub use pipeline::run_grouped_pipeline;

pub use pipeline::run_pipeline;

pub use review_session::ReviewSession;

Modules

apply

Byte-exact hunk applier.

config

Configuration, split by ownership (ADR 0012, amended by ADR 0018-era split):

document

Assemble the frozen-schema plan document from the engine’s outputs.

gitio

Git subprocess runner. Bytes in, bytes out — UTF-8 decoding happens only at display boundaries (ADR 0002). Plumbing commands only (ADR 0011).

grouping

The grouping stage: an LLM merges and labels shape-class ids — never hunks (ADR 0001) — behind the LlmBackend abstraction (ADR 0016), with a coverage audit that back-fills anything the model drops (invariant 5) and a content-hash cache that pins groupings (ADR 0009).

invariants

Invariants 1–4 (spec/invariants.md). All of them run before any document is emitted; every one caught a real bug during prototype validation.

lang

Language abstraction (ADR 0015).

llm

LLM backend abstraction (ADR 0016; an engine module since ADR 0018).

model

Data model for the canonical diff view.

ordering

The ordering stage: foundation-first arrangement of the focus section.

parse

Parser for git diff-tree -r -U0 --no-renames patch output.

paths

Path extraction from diff --git a/X b/Y headers.

pipeline

End-to-end core pipeline: enumerate → annotate → classify → verify → emit.

plan

Domain policy over a plan document: the decisions, without the I/O.

ports

Ports: the traits the engine’s business logic owns and adapters implement.

rename_view

The rename-detected classification view (ADR 0003).

review_session

An open review: the engine-owned session over one plan document.

review_state

The review-state sidecar store (ADR 0013, spec/persistence.md).

schema

The frozen JSON contract for differential reading plans.

shape

Shape classes and hunk digests.

store

Filesystem adapters: the mirror of gitio for everything that is not git.

tree

Build the final tree from applied hunks, via plumbing against a temporary index (ADR 0011). No checkout, no touching the user’s index or worktree.

worktree

Tree snapshots of uncommitted state (ADR 0017): the index and the worktree as plain tree oids, so the rest of the pipeline — diff-tree enumeration, the invariants, blob reads — runs on them unchanged.

Enums

EngineError

Type Aliases

FsReviewSession

The production session: a review over the on-disk sidecar. Renderers name this one concrete type rather than carrying a generic parameter for a choice they never make.