Hello everyone,

I am thinking about writing an extension that allows for each cell to be annotated with cells on which its execution depends on. Working in a modular fashion could be simplified because it would allow to write short code segments that need to be run as initialization for others. For example, I can write a dataset download and extract section, which is then set as a dependency for a graph drawing cell. If I run the graph drawing cell, the dependent cells will be run before it to ensure its successful execution.

Can anybody give me some hints on where to start (what part of the doc I should read, not even sure if this is a front-end or back-end extension maybe both?) and how this could be done (as rough pseudocode like "you catch the event notification of the cell to be run and trigger all cells that are in its json tag called deps. The deps you can collect for each cell by inserting deps as special tags").