Prefix all referenced CSS tags in HTML files

build.toml

[project]
scalaVersion      = "2.12.4-bin-typelevel-4"
scalaOptions      = ["-Yliteral-types"]
scalaOrganisation = "org.typelevel"

[module.app.jvm]
root      = "."
sources   = ["src"]
scalaDeps = [
  ["tech.sparse", "pine", "0.1.3"],
  ["com.github.pathikrit", "better-files", "3.5.0"]
]

PrefixClasses.scala

import pine._
import better.files._

// Place file in src/
object PrefixClasses extends App {
  File.currentWorkingDirectory.glob("*.html").foreach { file =>
    val newContent = HtmlParser.fromString(file.contentAsString).map {
      case t: Tag[_] => t.`class`.update(_.map(cls =>
        if (cls.startsWith("sk-")) cls else "sk-" + cls))
      case n => n
    }

    file.write(newContent.toHtml)
  }
}