Apologies. I had some CI build issues as I was rushing like an idiot and just uploaded the file thinking it would work. It obviously builds on my Catalina set up for SwiftUI development. I'm getting a 404 so I can't tell what the other fail is.

Hey @andreweades, thanks for contributing to Splash. I'll try to review this as soon as possible. Just to help you with the CI issues before then, rather than wrapping the entire implementation in conditional compilation, I suggest using the @available attribute on the new format. That should give you a cleaner implementation as well. If you want to verify your changes locally, just build Splash for the iOS simulator for an iOS version lower than 12, and you should see the same errors as on macOS Mojave.

Would love for @duemunk to take a look at this, since I know that he's been working on something similar 🙂 Will also need this to be covered with tests before it can be merged in, just a heads-up. But I'll try to review this within the next few days.

Looks really great!! Much simpler than my implementation. Particularly this is super clever:

texts.reduce(Text(""), +)

Great when SwiftUI can surprise in positive ways like that.

The implementation doesn't support the theme font.

That's right. I had some questions regarding font support as the SwiftUI way would be to use the .font view modifier. We could internalise this in the SwiftUITextOutputFormat or leave it to the user. I noted in my PR that this would be confusing so needs more thought.

Options:

1. internalise font support and maintain the API
2. separate colour theme from font selection as SwiftUI would encourage

But then I thought maybe it should just be a view modifier that can be applied to any Text and you would get something like the following:

Text(stringOfCode).syntaxHighlight(.presentation).font(.system(size: 12, design: .monospaced))

which leaves the font selection to the existing modifier.

After thinking about this a bit more... Maybe do 1 and make a syntaxHighlight view modifier that highlights and applies a font modifier.

My use case is demoed here.

I highlight the main text and the minimap using the same theme but with a different font applied to each.

I think using the theme's font is a good approach. The extensions are a nice to have in my opinion.

I will look into this again when I have some spare time. I will have to schedule some Open Source hours.

@andreweades Any plans to get this to completion?

@andreweades Any plans to get this to completion?

I think SwiftUI support for AttributedString supplants this.

@andreweades
But how to change the design of the font? I'd like to use .system(design: .monospaced), but this didn't work:

Text(
  AttributedString(
    SyntaxHighlighter(format: AttributedStringOutputFormat(theme: .sundellsColors(withFont: .init(size: 13))))
      .highlight(viewStore.codePreview)
    )
)
.font(.system(size: 13, design: .monospaced)) // <-- `.monospaced` gets ignored

Or is there a simple way to provide a SwiftUI.Font to the withFont which expects a Splash.Font?