A batteries-included Clojure notebook for eval-on-save workflows.

Fegloj is a batteries-included notebook environment for exploratory data analysis and literate programming in Clojure. It combines Clay (literate programming) and Noj (data science stack) with live-reload functionality:

• Clay: Notebook-style evaluation and browser-based rendering
• Noj: Comprehensive data science stack (Tablecloth, Fastmath, Scicloj.ml, and more)
• Live-reload: Auto-evaluation on file save
• REPL: Interactive development with full Clojure REPL
• Default notebook: Creates a starter notebook on first run

FEGL not REPL: Fegloj uses a File-Eval-GUI-Loop workflow instead of just a traditional REPL. Your file is the source of truth, and each save triggers evaluation. Clay re-evaluates the file and displays results in your browser. This is similar to Figwheel but for data science notebooks.

This supports data exploration, teaching, and prototyping.

• Java 11 or later (install Java if needed)
• A web browser (for viewing Clay outputs)

1. Download the latest fegloj-*-standalone.jar from Releases
2. Run it:

   java -jar fegloj-*-standalone.jar

3. Edit notebooks/my_notebook.clj in your favorite editor (VS Code, Emacs, Vim, etc.)
4. Save the file and watch your browser update with rendered output

On startup, fegloj:

• Creates a notebooks/ directory with a default my_notebook.clj
• Starts Clay with live-reload mode
• Opens rendered output in your browser
• Provides a REPL for interactive development

The FEGL Workflow:

1. Edit your notebook (notebooks/my_notebook.clj) in your favorite editor
2. Save the file (Cmd+S / Ctrl+S)
3. Clay automatically re-evaluates and updates your browser
4. Iterate!

• Clay Documentation - Learn about literate programming and visualization
• Noj Guide - Explore the data science toolkit
• Clojure for Data Science - Tutorials and examples
• Glance - Just plot

See individual component licenses:

• Clay: EPL-2.0
• Noj: EPL-2.0

Enjoy exploring data with Clojure! 🎨