readingisfun.

EPUB reader with coding agent integration. Uses your existing CLI subscription (Copilot, Claude Code, Codex, Gemini).

How to Run

pnpm install
cp server/.env.example server/.env
cp client/.env.example client/.env
pnpm dev

Client runs on http://localhost:5173, server on http://localhost:3002.

Features

Two Reading Modes

• Study Mode — Three-panel layout: chapter sidebar on the left, raw XHTML content in the center, AI chat / notes / highlights on the right. Panels are resizable and collapsible.

• Reader Mode — Paginated EPUB rendering via epub.js. Single-column view with page turns, three themes (light, sepia, dark), adjustable font size. AI and highlights accessible via slide-over panel on text selection.

AI Chat

Chat with an AI agent about what you're reading. The agent has read-only access to the book's content and can reference any chapter.

• Works with any provider: Anthropic, GitHub Copilot, Google Gemini, OpenAI Codex
• Authenticate through existing CLI subscriptions — no extra API keys needed

Web Search

The AI agent can search the web via Exa for information beyond the book's content. Set EXA_API_KEY in server/.env and VITE_WEB_SEARCH=true in client/.env (see setup above). A globe icon appears next to the chat input to toggle it.

Highlights & Notes

• Select text to highlight it (visually marked in reader mode)
• Take markdown notes per chapter
• All highlights and notes persist locally

EPUB Import

• Import any .epub file

Data

Everything lives in ~/.readingisfun/

~/.readingisfun/
├── auth.json                  # OAuth tokens
├── uploads/                   # Original EPUB files
└── books/{bookId}/
    ├── manifest.json           # Book metadata & chapter index
    ├── progress.json           # Reading percentage & last CFI position
    ├── images/                 # Extracted images
    └── chapters/{N}/
        ├── raw.html            # Chapter content (EPUB XHTML body)
        ├── metadata.json       # Title, word count, image refs
        ├── notes.md            # Your notes
        ├── highlights.json     # Your highlights
        └── chats/              # AI chat sessions