Include BUILD files in Xcode's Project navigator

[jpsim]

Resolves #300

Before	After

[jpsim]

This is super verbose, I'm sure there's a nicer way to do this.

[brentleyjones]

Hmm, I guess this is why I just had them as File.

I wonder if it would be better to have a second extra_file_paths instead of changing the type of extra_files? Then in xcodeproj.bzl we append extra_file_paths to the transformed extra_files and call to_dto on that?

[jpsim]

I don't feel strongly either way. I have a slight preference for keeping it as-is because I think this mapping is still simpler than having two ways to add extra files.

I was more asking if there's a more concise way to perform this mapping of a depset. Like inputs.srcs.map(file_path).

[brentleyjones]

The downside to this way is that we are cracking open the depset for each target, and if there are files that are duplicated in the inputs it's more efficient to only do it once later.

I'm fine with it like this though, since I'll be refactoring stuff later. Better to keep it localized for now.

As for your question:

transitive.extend([
    file_path(file)
    for file in inputs.srcs.to_list()
])

[jpsim]

Ah I didn't notice this syntax elsewhere, it's surprising to me because it's wrapped in square brackets already. e53f82f

[brentleyjones]

(Trying to debug a CI issue, sorry for the noise.)

[jpsim]

Thanks for guiding me through this @brentleyjones! 🙌

[brentleyjones]

Thanks for the contribution!