[Advice for creating a labelling plugin for Cura]

I want to create a Cura plugin to enable a user to label a model. 

 

The label would be text on the bed sitting next to the model.

 

The text might simply be text, or include macros, like:

"$speed" 

That, at slice time, is replaced with slice settings, such as the print speed in this case.

 

I'm trying to figure out what hooks I can get into in Uranium (Cura code).  I have read this page in the examples there: 

https://github.com/Ultimaker/Cura/wiki/Plugin-Directory

 

Can anyone tell me, or point me to a link that explains, the set of available hooks? 

 

Does anyone have an advice on how a plug-in like this should be implemented? 

 

After reading the Tool plugin example at the link above, I imagine how this could be implemented as a Tool plugin, which receives events when the tools active, and then can work with the items in the Cura Scene. 

 

Some things I can see that I will have to do:

- accept user input, (label content)

- possibly consider selection in the scene, so that a user can apply a specific label to a specific item in the scene

- replace macros with values at slice time

- add items to the scene that get sliced by the slicer

 

Any suggestions?

 

Will