myoshi2891 · myoshi2891 · Feb 19, 2026 · Feb 19, 2026 · Feb 19, 2026 · Feb 19, 2026
diff --git a/INDEX_MAINTENANCE.md b/INDEX_MAINTENANCE.md
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+# Index Maintenance Guide
+
+This project includes tools to automatically generate and update the `index.html` file, which serves as a categorized table of contents for all HTML documentation in the repository.
+
+## How It Works
+
+The index maintenance system consists of two main scripts:
+
+1. **`generate_index.py`**: A Python script that:
+    - Scans the directory structure.
+    - Extracts titles from HTML files.
+    - Copies HTML files to a clean `public/` directory.
+    - **Vendors Dependencies**: Copies required libraries (React, Babel, PrismJS, etc.) from `node_modules` to `public/vendor`.
+    - **Rewrites Links**: Updates HTML files to point to local `/vendor/...` assets instead of CDNs.
+    - Generates a categorised `index.html` with a tabbed interface.
+
+## Dependency Management
+
+This project uses `bun` to manage dependencies.
+
+- **Install Dependencies**: `bun install`
+- **Add New Library**: `bun add <library>`
+- **Vendor Logic**: If you add a new library, update `generate_index.py` to copy it to `public/vendor` and add a rewrite rule.
+
+## Manual Update
+
+To manually update the index (for example, after adding new problems), run the following command in the root directory:
+
+```bash
+./update_index.sh
+```
+
+This will populate the `public/` directory with the latest file structure and `index.html`.
+
+## Automatic Update (Git Hook)
+
+You can set up a Git **pre-commit hook** to automatically update the index every time you commit. This ensures `index.html` is always in sync with your changes.
+
+### Setup Instructions
+
+1. Make the wrapper script executable:
+
+    ```bash
+    chmod +x update_index.sh
+    ```
+
+2. Create the hook file:
+
+    ```bash
+    touch .git/hooks/pre-commit
+    ```
+
+3. Open `.git/hooks/pre-commit` in a text editor and add the following content:
+
+    ```bash
+    #!/bin/bash
+
+    # Generate index and populate public/ directory. Fail if scripts fail.
+    echo "Updating public index..."
+    ./update_index.sh || exit 1
+
+    # Add public directory to the commit if modified
+    if ! git diff --quiet public; then
+        echo "Staging updated public directory..."
+        git add public
+    fi
+    ```
+
+4. Make the hook executable:
+
+    ```bash
+    chmod +x .git/hooks/pre-commit
+    ```
+
+### How it Works
+
+Now, whenever you run `git commit`:
+
+1. The hook runs `update_index.sh`. If it fails, the commit is aborted.
+2. The `public/` directory (including `index.html` and copied content) is updated.
+3. If `public/` has changed, it is automatically staged (`git add`).
+4. The commit proceeds with the updated public artifacts.
diff --git a/README.md b/README.md
diff --git a/bun.lock b/bun.lock