jnsahaj/lumen

Beautiful git diff viewer, generate commits with AI, get summary of changes, all from the CLI

What it solves

Lumen is a fast terminal-based user interface (TUI) for viewing code diffs and performing code reviews. It eliminates the need to leave the terminal to review git diff, commits, branches, or GitHub Pull Requests side-by-side, while remaining performant even with very large diffs.

How it works

Written in Rust, Lumen provides an interactive side-by-side viewer with tree-sitter syntax highlighting. It integrates with Git and Jujutsu (jj) and can be used as a review surface for coding agents. Users can annotate selections, hunks, or entire files, and in agent-integrated workflows, send these annotations back to the agent as a prompt via stdout.

Who it’s for

Developers who prefer working in the terminal and want a high-performance diff viewer for local changes, commit history, and PR reviews.

Highlights

  • Side-by-side diffing: View changes across commits, branches, or GitHub PRs.
  • AI-powered helpers: Generate commit messages, explain changes, and generate Git commands using natural language.
  • Agent integration: Use as a review surface for AI coding agents (e.g., Claude Code) to provide inline feedback.
  • Stacked review: Review a range of commits one by one while preserving progress.
  • Extensive AI provider support: Compatible with OpenAI, Claude, Gemini, Groq, DeepSeek, xAI, Ollama, and others.

Related

  • Project
    modem-dev/hunk

    hunk is a terminal‑based, interactive diff viewer that adds a UI layer (sidebar, split/unified panes, mouse support) on top of Git/Jujutsu/Sapling diffs. It includes built‑in support for inline AI/agent annotations and an extensible TypeScript plugin system, making it a useful front‑end for AI‑assisted code review.

  • Project
    control-theory/gonzo

    A Go-based TUI for real-time log analysis that combines live streaming, visual dashboards, and AI-powered insights for debugging distributed systems.

  • Project
    alibaba/open-code-review

    An AI-powered code review CLI tool that combines deterministic engineering with an AI agent to provide high-precision, token-efficient reviews of Git diffs and full files.

  • Project
    persiyanov/herdr-reviewr

    A terminal-based code review interface for the herdr AI coding agent that lets you inspect diffs, comment on code, and send feedback to the agent without leaving your terminal.

  • Project
    r3bl-org/r3bl-open-core

    r3bl‑open‑core (ROC) is a Rust async TUI framework that modernizes terminal UIs with React‑style reactive rendering, non‑blocking input, PTY multiplexing, and Unicode‑safe strings. It targets AI/LLM coding agents, DevOps SSH workflows, interactive Markdown, and general developer productivity, offering five crates (core engine, apps, build tools, rust‑analyzer server, analytics schema) and has amassed 2.7 M+ downloads.