RepoRewind

RepoRewind is a Windows desktop application that turns Dart and Kotlin Git history into a rewindable semantic graph. It analyzes repositories in a private cache, never checks out or modifies the selected working tree, and stores all indexes locally.

Download the Windows installer · OpenAI Build Week submission

MVP capabilities

• Native Git working-tree picker and explicit repository trust.
• Dart Analysis Server and checksum-pinned JetBrains Kotlin LSP runtime management.
• Current working-tree graph first, then cancellable newest-first HEAD ancestry indexing.
• Class-like entities connected by language-server call-hierarchy evidence.
• SQLite/WAL metadata with zstd checkpoints and semantic deltas.
• 3D mouse navigation, package clustering, filters, entity search, edge evidence, commit rewind, and paginated related commits.
• Windows x64 NSIS packaging through Tauri 2.

Development

Prerequisites are Node.js, the Rust MSVC toolchain, Visual Studio C++ Build Tools, and WebView2. Dart/Flutter is required to analyze Dart repositories; Kotlin can be installed from the setup screen.

npm install
npm test
npm run tauri build

Indexes and managed runtimes live under %LOCALAPPDATA%\RepoRewind. Dependency restore is permitted only after repository trust and only inside RepoRewind's materialized cache workspaces.

Architecture

The React interface calls a narrow set of Tauri commands. Rust owns Git traversal/materialization, LSP sessions, runtime installation, semantic identity and deltas, checkpoints, SQLite persistence, pagination, and background job cancellation. Historical reconstruction starts from the nearest first-parent checkpoint and applies bounded deltas; incomplete analysis remains explicitly partial.

Judge quick start

RepoRewind supports Windows x64. The fastest path is the prebuilt RepoRewind_0.1.6_x64-setup.exe attached to the GitHub release. Install it, select a local Dart or Kotlin repository with several commits, review the explicit trust prompt, start analysis, select an entity, inspect What changed and Affected code, and rewind from the commit timeline. No account or API key is required, and the selected working tree is not modified.

How Codex and GPT-5.6 were used

RepoRewind was built collaboratively in Codex with GPT-5.6 Sol. Codex accelerated repository-wide work across React, Rust, Git, SQLite, tests, and Windows packaging: diagnosing stale completed indexes using working-tree fingerprints, replacing an unscalable layout with deterministic Barnes-Hut physics in a Web Worker, and tracing Git commit descriptions end-to-end into the story-first inspector.

Human direction set the product constraints: visible connections and readable labels, scalable layout instead of hand-tuned physics, and a clear story before dense technical evidence. See the Codex/GPT-5.6 evidence plan.

Build Week materials

• Narrated demo script
• Prepared Devpost copy
• Requirement checklist

License

RepoRewind is available under the MIT License.