Access notebook variables from a smart cell

[MachinesAreUs]

Hello, I'm trying to create a smart-cell that picks-ups the value of a variable from previous code cells. Specifically I'm trying tho access a string value already defined before in a code cell. The reason to pick this from the environment and not to specify it as an input, is that I would like to create several smart-cells and I wouldn't want the user to define this variable for each of them.

This is my current code,. but I don't get how set the value of attrs["database"] from the environment.

  @impl true
  def to_source(attrs) do
    quote do
      app_input = Kino.Input.text("Application")
      ns_input = Kino.Input.text("Namespace")

      form = Kino.Control.form([app: app_input, ns: ns_input], submit: "Run")
      frame = Kino.Frame.new()

      Kino.listen(form, fn %{data: %{app: app, ns: ns}} ->
          Kino.Frame.render(frame, Kino.Text.new("Running..."))

          png = XrefAnalysis.graph(
            app: app,
            namespace: ns,
            origin: false,
            dest: false,
            format: "png",
            db_name: unquote(attrs["database"])
          )

          img = Kino.Image.new(png, "image/png")
          Kino.Frame.render(frame, img)
      end)

      Kino.Layout.grid([form, frame], boxed: true, gap: 16)
    end |> Kino.SmartCell.quoted_to_string()
  end

Any suggestion?
Thank you!

[jonatanklosko]

Hey, you can look at the SQL cell in kino_db, it shows a variable select with database connections defined earlier. The most relevant part is here, this is how you access the variables.

Note that if you assume that the variables is named database, then you could actually just do db_name: database.

That said, for a single parameter like the database name, personally I don't think it's a big deal if they need to enter it as part of the smart cell, all the code is written for them anyway and the form itself has two inputs.