[moriabbey]

I'm looking to make a plugin that seems fairly simple, but I can't figure out how to go about it. I want it to, every time a specific custom metadata field is changed, change the "Title sort" metadata field to be identical to that custom metadata field. Reading and changing metadata fields seems straightforward enough from the API documentation, but I don't see how I would get it to trigger on a metadata field being changed. I have some very basic Python experience, enough to fumble my way through the API docs, but zero experience with calibre plugins or any kind of real development. Is something like this at all possible?