jupyterlab-cell-enhancements

Enhancements for JupyterLab 4 notebook cells:

• Cell titles — give any cell an editable title shown above the input. Titles are stored in the cell's metadata (cell_title) so they travel with the notebook. Hover a cell and click "Add a cell title…", or click an existing title to rename it. Press Enter to save, Esc to cancel.

• Focus mode — a corner-brackets button in the cell toolbar expands a single cell to fill the notebook, hiding everything else. Toggle the button again or press Esc to exit. Keyboard shortcut: Ctrl/Cmd + Shift + Enter while the notebook is focused.

• Floating notes — attach a note to any cell. Click the marker in a cell's top-right corner to open a floating card, anchored to the cell and connected by a leader line. Notes:

  • render Markdown and LaTeX (via JupyterLab's own renderer), so **bold**, lists, code, links and $x^2$ math all work;
  • float above everything, including the sidebars, and follow their cell as you scroll — hiding automatically once the cell scrolls out of view;
  • are draggable; drag the header to reposition and the note stays glued to its cell at the new offset;
  • persist in cell metadata (cell_comment), including text, author, open/closed state and position, and are saved automatically shortly after any change.

  Set your display name under Settings → Cell Enhancements → Comment author.

Requirements

• JupyterLab >= 4.0.0

Install

pip install jupyterlab-cell-enhancements

Uninstall

pip uninstall jupyterlab-cell-enhancements

Development install

# Clone, then from the repo root:
pip install -e .
jupyter labextension develop . --overwrite
jlpm build

Rebuild after source changes with jlpm build, or run jlpm watch in one terminal and jupyter lab in another.

Building on a network / mapped drive (important)

This project's canonical location is on a mapped network drive (Z:), which Node resolves to a UNC path (\\server\share\...). webpack's resolver cannot handle UNC absolute paths, so jlpm build:prod / python -m build must be run from a copy of the repo on a local disk (e.g. C:\...). Editing and version control can stay on Z:; only the build/package step needs local disk. Copy the resulting dist/*.whl (and jupyterlab_cell_enhancements/labextension/) back if you want them alongside the source.

license-webpack-plugin patch

webpack >= 5.107 changed the ProvideSharedModule identifier separator from = to |, which crashes license-webpack-plugin@4.0.2 during the production build. A Yarn patch in .yarn/patches/ fixes this (wired via the resolutions field in package.json); it is applied automatically on jlpm install.