jupyterlab_celltagsclasses

An extension to expose cell tags as CSS classes

Requirements

• JupyterLab >= 4.0.0

Install

To install the extension, execute:

pip install jupyterlab_celltagsclasses

Uninstall

To remove the extension, execute:

pip uninstall jupyterlab_celltagsclasses

What it does

CSS classes

each cell has its widget (the DOM element) classes kept in sync in terms of the cell's tags;
for example, adding tag foobar will result in the current cell having class cell-tag-foobar added

specifically the DOM elements that are decorated have the .jpCell class set by jlab, like so, where we have set tag celltagsclasses-test1

metadata management helper functions

it also exports utilities to manage a cell's metadata, specifically for

• getting, setting or unsetting a key/value pair
• adding, removing items in a list inside the metadata (e.g. tags)
• cleaning the metadata for empty/useless items

to that effect, see the md_get and similar functions in metadata.ts (that can be imported right from the module)

helper: apply function on cells

the apply_on_cells function allows you to write a function that works on an individual cell, and then call it on either

• the active cell only
• all the selected cells if relevant, otherwise the active cell
• all the cells in the notebook

for that you can pass it a Scope value that can be either Active, Multiple, or All

Development

See the documentation on Jlab extensions for more details; the gist of it is

Development install

# Clone the repo to your local environment
# Change directory to the jupyterlab_celltagsclasses directory
# Install package in development mode
pip install -e "."
# Link your development version of the extension with JupyterLab
jupyter labextension develop . --overwrite
# Rebuild extension Typescript source after making changes
jlpm build

You can watch the source directory and run JupyterLab at the same time in different terminals to watch for changes in the extension's source and automatically rebuild the extension.

# Watch the source directory in one terminal, automatically rebuilding when needed
jlpm watch
# Run JupyterLab in another terminal
jupyter lab

Development uninstall

pip uninstall jupyterlab_celltagsclasses

In development mode, you will also need to remove the symlink created by jupyter labextension develop command. To find its location, you can run jupyter labextension list to figure out where the labextensions folder is located. Then you can remove the symlink named jupyterlab-celltagsclasses within that folder.

Packaging the extension

See RELEASE

testing

the metadata module

probably suboptimal but that's my first..

npm install -g typescript '@types/node'

rm src/*js
tsc src/xpath*ts && node src/xpath-test.js

I have tried to use ts-node but to no avail so far