Way from julia and javascript to store metadata in notebook file

[dralletje]

Soon we'll merge #1209 in, which will likely store a disabled field in the notebook in some way. We're going to need this more.

Specifically, I need it to eventually make an app-grid-builder UI, and it feels better to have those values stored with the cell, instead of separately in a # 0000000-... cell. That does still make sense for global values, less for cell-specifiek values, but for cell-specific values it feels better to store it next to the cell.

I'm thinking of "just" storing TOML:

# ╔═╡6a49a6ec-2a2a-42ce-8b20-c4773d02c235
# ╟─ my_config_value = true

This way it will support nesting, bare values, everything that TOML does!
And Julia people like TOML 😏

Fancier example, possibly with the tabletop-y ╢ thing even

# ╔═╡6a49a6ec-2a2a-42ce-8b20-c4773d02c235
# ╠═╡disabled = false
# ╠═╡[dral-app-config]
# ╠═╡page = frontpage

[fonsp]

See also #421 and https://www.notion.so/malyvsen/Flexible-notebook-format-61749c09aa1b450fa79f025d725bef4c (nothing here yet)

[fonsp]

Looks good! Note that #1209 goes one step further by also commenting out the cell code when (indirectly) disabled.

[dralletje]

See also #421 and https://www.notion.so/malyvsen/Flexible-notebook-format-61749c09aa1b450fa79f025d725bef4c (nothing here yet)

I knew I didn't think of this by myself!!

[disberd]

Love this! It would open up so many more possibilities! :D

[fonsp]

@dralletje Started working on this, ( can you make a draft PR? https://github.com/fonsp/Pluto.jl/compare/metadata-in-notebook-file?expand=1 )

[lungben]

My suggestion for the scope of this issue:

1. Add a field to Cell containing the metadata (as a Dict[String, Any})
2. Write the content of the metadata field to the notebook.jl file
3. Read the metatdata from the notebook.jl file and add it into the Cell metadata field
4. Pass the Cell metadata field to the frontend (not required for saving / loading disable status of cells #1209 but this would allow other cool features like custom cell formatting)

Fons' code above already covers most of 2.+3.

What do you think?

[lungben]

I'll take a shot in #1895