[PROPOSAL] dynamic default attributes

[mylesj]

Sorry if you'd really prefer that I raise this as an issue first - it just seemed like a simple enough idea to demonstrate in a PR. If I've missed something in the public API that would otherwise solve the same problem, I'd appreciate some input.

Description

Resolve a default attribute thunk once when a node is created, in order to compute a default value dynamically.

Use-case

I'd like to be able assign an attribute to a node that uniquely identifies it.

Example usage

Node.create({
    // ...
    addAttributes() {
        return {
            id: {
                default: () => generate_uuid(),
                parseHTML: element => element.getAttribute('id')
            }
        }
    }
})

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[bdbch]

LGTM. Nice idea! @svenadlung do you have any thoughts on this?

[mylesj]

Oh nice, thanks for this.

I did have one additional thought (not required for my use-case however) but imagined it could be useful if the editor was passed as an argument to the thunk. I wasn't sure how problematic this would be though - given that the node definition is generally required to generate the schema before the editor is instantiated.

[bdbch]

Feel free to open a feature request issue for that - I like the idea but wouldn't keep track of it in this PR :)