ark: support completion for ggplot2 aesthetics

Thomas Pedersen [2:22 AM]
Would it be possible to get argument suggestions in a function that only takes ... based on the context it is called in?

Kevin Ushey [9:49 AM]
Possibly… do you have a motivating example?

Thomas Pedersen [7:36 AM]
For instance in ggplot2 with aes() where it would be nice to have auto completion of the aesthetics that are possible in the layer

I think an example of this code would be something like:

ggplot(mtcars) + geom_point(aes(|))

where the valid autocompletion results for that aes() call would be inferred based on the aesthetics accepted by geom_point().

Start with the ggplot2 example in the issue: ggplot(mtcars) + geom_point(aes(|)). The payload names no source files, tests, or entry points, so the first research step is to locate ark's completion handling and determine how a call context could expose the enclosing layer's accepted aesthetics. Done means context-aware suggestions appear for the example without breaking ordinary completion.