Improve Juno integration

[davidanthoff]

Main thing would be to get the interactive stuff working.

[pfitzseb]

For reference: JunoLab/Juno.jl#125 (comment)

Juno's API for things like this will (hopefully) change drastically soon since I'm hoping to get rid of the Blink.jl dependency... I can take another look at this then.

[davidanthoff]

Would be great if we could take another look at this, given for example https://discourse.julialang.org/t/vega-lite-width-and-height-in-heatmap-in-juno-sometimes-doesnt-work/33262/4.

@pfitzseb, I haven't followed the Juno plot story, I assume it is now using MIME types and the normal display stuff? In VS Code and ElectronDisplay.jl we just support the vega and vega-lite MIME types out of the box (essentially emulating JupyterLab and nteract). So we ship the javascript client libraries that are need to display these MIME types as part of these clients, and then get interactivity that way. What would our current options for Juno be? Similar story, or something else?

[pfitzseb]

So in theory

function Base.show(io::IO, m::MIME"application/prs.juno.plotpane+html", v::VegaLite.VGSpec)
    VegaLite.writehtml_full(io, v)
end

function Base.show(io::IO, m::MIME"application/prs.juno.plotpane+html", v::VegaLite.VLSpec)
    VegaLite.writehtml_full(io, v)
end

should work, except for the fact that writehtml_full doesn't have a method for VLSpec/VGSpec.

[davidanthoff]

That is perfect! I know how to sort out the details inside those functions.