Add implicit method flat to Entity

This method can be used when pickling the `currentEntity` on each page

Author: felixmulder

dottydoc/jvm/src/dotty/tools/dottydoc/html/EntityPage.scala

@@ -9,6 +9,7 @@ case class EntityPage(entity: Entity, packages: Map[String, Package]) {
   import CustomTags._
   import model.pickling._
   import prickle._
+  import util.internal.setters._
 
   private def relPath(to: String, from: Entity) =
     "../" * from.path.length + to
@@ -68,7 +69,7 @@ case class EntityPage(entity: Entity, packages: Map[String, Package]) {
       )
     ),
     script(
-      raw(s"""|UnparsedIndex.currentEntity = ${Pickle.intoString(entity)};
+      raw(s"""|UnparsedIndex.currentEntity = ${Pickle.intoString(entity.flat)};
               |dotty.tools.dottydoc.js.DottyDocJS()
               |     .main(document.getElementById("entity-container"));
            """.stripMargin)

dottydoc/jvm/src/dotty/tools/dottydoc/util/mutate.scala

@@ -36,4 +36,29 @@ object setters {
       e.parent = to
     case _ => ()
   }
+
+  implicit class FlattenedEntity(val ent: Entity) extends AnyVal {
+    /** Returns a flat copy if anything was changed (Entity with Members) else
+     *  the identity
+     */
+    def flat: Entity = {
+      def flattenMember: Entity => Entity = {
+        case e: PackageImpl   => e.copy(members = Nil)
+        case e: ObjectImpl    => e.copy(members = Nil)
+        case e: CaseClassImpl => e.copy(members = Nil)
+        case e: ClassImpl     => e.copy(members = Nil)
+        case e: TraitImpl     => e.copy(members = Nil)
+        case other            => other
+      }
+
+      ent match {
+        case e: PackageImpl   => e.copy(members = e.members.map(flattenMember))
+        case e: ObjectImpl    => e.copy(members = e.members.map(flattenMember))
+        case e: CaseClassImpl => e.copy(members = e.members.map(flattenMember))
+        case e: ClassImpl     => e.copy(members = e.members.map(flattenMember))
+        case e: TraitImpl     => e.copy(members = e.members.map(flattenMember))
+        case other            => other
+      }
+    }
+  }
 }

dottydoc/shared/src/main/scala/dotty/tools/dottydoc/model/factories.scala

@@ -7,7 +7,6 @@ import dotc.core.Contexts.Context
 import dotc.core.Symbols.Symbol
 import dotc.core.{ Flags => DottyFlags }
 import dotc.ast.Trees._
-import DottyFlags.FlagSet
 
 object factories {
   import dotty.tools.dotc.ast.tpd._