A desktop diff viewer that fetches GitHub PRs, structures diffs into hunks, and uses LLM (Codex CLI) to group changes by intent — so you can review one purpose at a time.
Built with Tauri v2 + React + TypeScript + Rust.
| Tool | Role | Install |
|---|---|---|
| Node.js (v18+) | Frontend build | https://nodejs.org/ |
| Rust (stable) | Backend | curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh |
GitHub CLI (gh) |
PR list & diff | brew install gh |
Codex CLI (codex) |
Intent analysis (optional) | https://github.com/openai/codex |
npm install
gh auth login
codex login # optional — only needed for intent analysisnpm run tauri dev- Enter a repo (e.g.
facebook/react) and click Fetch PRs - Select a PR — diff is fetched, parsed, and displayed in the center pane
- Click Run — hunks are grouped by change intent (cached for instant recall)
- Click a group to filter the diff; summary, rationale, and checklists appear in the right pane
- Check off groups as you review them
- Use Refine on a group to split it into smaller sub-groups
- Use Re-run to bypass cache and re-analyze
- Intent grouping — LLM groups hunks by change purpose with category labels (schema, logic, api, ui, test, config, docs, refactor)
- Risk coloring — Group badges are colored by risk level (green/yellow/red)
- Cosmetic detection — Non-substantive changes (formatting, whitespace, lock files) are auto-collapsed
- Disk cache — Analysis results and PR diffs are cached to disk for instant recall across sessions
- Substantive filter — Toggle to collapse/expand cosmetic hunks
- File filters — Filter by extension, hide test files
- Settings — Configure Codex model, response language, and manage cache
| Error | Fix |
|---|---|
gh is not installed |
brew install gh |
gh is not authenticated |
Run gh auth login |
Codex CLI is not installed |
Install Codex (diff viewing works without it) |
Codex CLI is not authenticated |
Run codex login |
| Empty diff | PR has no changes — check branch comparison |
| Analysis validation error | Codex output was malformed — retry usually fixes it |
prvw/
├── src/ # Frontend (React + TS)
│ ├── App.tsx # Main shell — header, routing, state
│ ├── App.css # Styles
│ ├── types.ts # TypeScript type definitions
│ ├── constants.ts # Shared constants
│ ├── components/
│ │ ├── PrList.tsx # PR list table
│ │ ├── GroupsPane.tsx # Left pane — intent groups
│ │ ├── DiffPane.tsx # Center pane — diff view
│ │ ├── SummaryPane.tsx # Right pane — summary / AI comments
│ │ └── SettingsModal.tsx # Settings & cache management
│ ├── hooks/
│ │ ├── useAnalysis.ts # Codex analysis + refine logic
│ │ ├── useCodexApi.ts # Tauri invoke wrappers
│ │ ├── useGroupFiltering.ts # Group selection & filtering
│ │ ├── usePrDiff.ts # PR diff fetching
│ │ ├── usePrList.ts # PR list fetching
│ │ ├── useRepoHistory.ts # Repo input history
│ │ └── useSettings.ts # Settings persistence
│ └── utils/
│ └── classifyFile.ts # File category classification
├── src-tauri/ # Backend (Rust)
│ ├── schemas/ # JSON schemas for Codex output
│ └── src/
│ ├── lib.rs # Tauri app init & command registration
│ ├── types.rs # Shared structs
│ ├── gh.rs # GitHub CLI commands
│ ├── diff_parser.rs # Unified diff parser
│ ├── codex.rs # Codex CLI commands (analyze, refine)
│ ├── codex_runner.rs # Codex subprocess execution
│ ├── cache.rs # Disk cache utilities
│ └── validation.rs # Analysis result validation
├── index.html
└── package.json