Move scaladoc-only concerns to a file

build.sbt

@@ -47,7 +47,6 @@ val asmDep            = "org.scala-lang.modules"         % "scala-asm"
 val jlineDep          = "jline"                          % "jline"                            % versionProps("jline.version")
 val testInterfaceDep  = "org.scala-sbt"                  % "test-interface"                   % "1.0"
 val diffUtilsDep      = "com.googlecode.java-diff-utils" % "diffutils"                        % "1.3.0"
-val jqueryDep         = "org.webjars"                    % "jquery"                           % "3.4.1"
 
 lazy val publishSettings : Seq[Setting[_]] = Seq(
   credentials ++= {
@@ -499,19 +498,8 @@ lazy val scaladoc = configureAsSubproject(project)
     name := "scala-compiler-doc",
     description := "Scala Documentation Generator",
     includeFilter in unmanagedResources in Compile := "*.html" | "*.css" | "*.gif" | "*.png" | "*.js" | "*.txt" | "*.svg" | "*.eot" | "*.woff" | "*.ttf",
-    libraryDependencies += jqueryDep,
-    resourceGenerators in Compile += Def.task {
-      def isWebjar(s: Attributed[File]): Boolean =
-        s.get(artifact.key).isDefined && s.get(moduleID.key).exists(_.organization == "org.webjars")
-      val dest = (resourceManaged.value / "webjars").getAbsoluteFile
-      IO.createDirectory(dest)
-      val classpathes = (dependencyClasspath in Compile).value
-      val files: Seq[File] = classpathes.filter(isWebjar).flatMap { classpathEntry =>
-        val jarFile = classpathEntry.data
-        IO.unzip(jarFile, dest)
-      }
-      (files ** "*.min.js").get()
-    }.taskValue
+    libraryDependencies ++= ScaladocSettings.webjarResoources,
+    resourceGenerators in Compile += ScaladocSettings.extractResourcesFromWebjar
   )
   .dependsOn(compiler)
 

project/ScaladocSettings.scala

@@ -0,0 +1,25 @@
+package scala.build
+
+import sbt._
+import sbt.Keys.{ artifact, dependencyClasspath, moduleID, resourceManaged }
+
+object ScaladocSettings {
+
+  val webjarResoources = Seq(
+    "org.webjars" % "jquery" % "3.4.1"
+  )
+
+  def extractResourcesFromWebjar = Def.task {
+    def isWebjar(s: Attributed[File]): Boolean =
+      s.get(artifact.key).isDefined && s.get(moduleID.key).exists(_.organization == "org.webjars")
+    val dest = (resourceManaged.value / "webjars").getAbsoluteFile
+    IO.createDirectory(dest)
+    val classpathes = (dependencyClasspath in Compile).value
+    val files: Seq[File] = classpathes.filter(isWebjar).flatMap { classpathEntry =>
+      val jarFile = classpathEntry.data
+      IO.unzip(jarFile, dest)
+    }
+    (files ** "*.min.js").get()
+  }
+
+}