private def processLibraries()

in packaging/src/main/scala/org/jetbrains/sbtidea/packaging/mappings/LinearMappingsBuilder.scala [103:142]
30 lines of code
9 McCabe index (conditional complexity)

  private def processLibraries(node: PackagedProjectNode, targetJar: File): Unit = {
    def mapping(jarFile: File, to: File): Mapping =
      if (node.packagingOptions.assembleLibraries)
        Mapping(jarFile, targetJar, node.mmd.copy(kind = MAPPING_KIND.LIB_ASSEMBLY))
      else
        Mapping(jarFile, to, node.mmd.copy(kind = MAPPING_KIND.LIB))

    val mappings: Map[structure.ModuleKey, Option[String]] =
      node.packagingOptions.libraryMappings.toMap

    val invalidMappings = mappings
      .filterNot { case (key, _) =>
        key.org == "org.scala-lang.modules" || // filter out default mappings
          key.org == "org.scala-lang"         || // filter out default mappings
          node.libs.exists(_.key == key)
      }
    invalidMappings.foreach { m =>
      log.fatal(s"No library dependencies match mapping $m in module ${node.name}")
    }

    for {
      lib <- node.libs
      jarFile <- lib.jarFiles
    } {
      // ATTENTION!
      // This code can't handle the case with multiple artifacts in the library with different classifiers
      // Current mapping can map only the whole module id but not separate artifacts with different classifiers
      // E.g. if user has ("org.lwjgl" % "lwjgl" % "3.3.6" % Runtime).classifier("natives-windows")
      // and wants to map only it to `lib/native` using `packageLibraryMappings` it won't work
      // (see https://github.com/JetBrains/sbt-idea-plugin/issues/135)
      // But so far it's ok, we don't have real examples when that would be really needed
      mappings.get(lib.key) match {
        case Some(None) => // to ignore the artifact, None means "don't package the library"
        case Some(Some(mappedLocation)) =>
          mappingsBuffer += mapping(jarFile, outputDir / mappedLocation)
        case _ =>
          mappingsBuffer += mapping(jarFile, outputDir / s"${node.packagingOptions.libraryBaseDir}/${jarFile.getName}")
      }
    }
  }