"Dynamic" recipes

[nicogelders]

Make recipes take variables so that they could be reused more easily.

Example:

The recipe:

max_cells = RecipeInfo(
    src="len(nb.cells) < amount_max",
    description="Assert that there are less than 'amount_max' cells in the notebook.",
)

The command:

databooks assert path/to/nbs --recipe max_cells --amount_max 10

databooks assert path/to/nbs --recipe max_cells --help

Would return the arguments of that recipe

[nicogelders]

The --help thing might be tricky maybe do something like this

databooks inspect-recipe max_cells

[murilo-cunha]

After some thought, I see 3 ways of accomplishing this:

1. We could allow extra arguments and if they are passed we replace the string with the right values
2. We could dynamically create subcommands - one for each recipe with it's own help and call each subcommand after assert has run
3. Create another command entirely for recipes

Some points to consider:

• What if the user passes multiple recipes?
• What if the arguments have similar names?
• How can we enforce that the arguments go to the correct recipe?

As of now, I do not see a feature like this because

• It may make the app less intuitive for users and add some unnecessary complexity
• We only have one recipe that it'd make sense to pass arguments (max-cells)
• If a user really wants another value, he/she can easily do this by passing the expression instead of the recipe + argument (databooks assert "len(nb.cells) < 10")

That being said, I'm open to revisit this once we have more recipes/there's community interest in a feature like this. If there's a simple way to go around this I'm also open to review any PRs regarding this.

Thanks for your suggestion! 🚀