gistfile1.swift

#!/usr/bin/env xcrun swift -F Rome

import Foundation
import CommonMark
import LiterateSwift

func stripPrelude(var blocks: [Block]) -> [Block] {
    guard blocks.count > 0 else { return blocks }
    guard case let Block.Header(text, _) = blocks[0] where text.count == 1 else {
        return blocks
    }
    guard case InlineElement.Text(text: "Prelude") = text[0] else {
        return blocks
    }
    blocks.dropFirst()
    
    for el in blocks {
        if case Block.CodeBlock(_, _) = el {
            blocks.removeAtIndex(0)
        } else {
            break
        }
    }
    
    return blocks
}