find unused Dependencies.scala val in build.sbt

build.sbt

import scala.io.Source
import scala.util.matching.Regex

val findUnusedDeps = taskKey[Unit]("Finds unused dependencies from Dependencies.scala")

findUnusedDeps := {
  // 1. Parse Dependencies.scala
  val depsFile = (baseDirectory.value / "project" / "Dependencies.scala").getAbsolutePath
  val depsContent = Source.fromFile(depsFile).getLines.mkString("\n")
  val valuesRegex: Regex = """val (\w+) =""".r
  val definedValues = valuesRegex.findAllMatchIn(depsContent).map(_.group(1)).toList

  // 2. Convert the content of build.sbt into a string format
  val sbtContent = IO.read(baseDirectory.value / "build.sbt")

  // 3. Find values that are used only once in Dependencies.scala (i.e., at their declaration)
  val internallyUsedValues = definedValues.filter(value => depsContent.split(value).length > 2)

  // 4. Find unused values
  val unusedValues = definedValues.filterNot(value => sbtContent.contains(value) || internallyUsedValues.contains(value))

  if (unusedValues.isEmpty) {
    println("All dependencies from Dependencies.scala are used in build.sbt.")
  } else {
    println("Values from Dependencies.scala not used in build.sbt:")
    unusedValues.foreach(println)
  }
}

// Rest of your build.sbt configurations...