Drop interplay

build.sbt

@@ -1,5 +1,3 @@
-import interplay.ScalaVersions._
-
 // Customise sbt-dynver's behaviour to make it work with tags which aren't v-prefixed
 (ThisBuild / dynverVTagPrefix) := false
 
@@ -11,9 +9,14 @@ Global / onLoad := (Global / onLoad).value.andThen { s =>
 }
 
 lazy val `play-doc` = (project in file("."))
-  .enablePlugins(PlayLibrary, SbtTwirl)
+  .enablePlugins(Omnidoc, SbtTwirl)
   .settings(
-    crossScalaVersions := Seq(scala212, scala213, scala3),
+    organization         := "com.typesafe.play",
+    organizationName     := "The Play Framework Project",
+    organizationHomepage := Some(url("https://playframework.com")),
+    homepage             := Some(url(s"https://github.com/playframework/${Omnidoc.repoName}")),
+    licenses             := Seq("Apache-2.0" -> url("https://www.apache.org/licenses/LICENSE-2.0.html")),
+    crossScalaVersions   := Seq("2.12.18", "2.13.12", "3.3.1"),
     scalacOptions ++= {
       CrossVersion.partialVersion(scalaVersion.value) match {
         case Some((2, _)) =>
@@ -48,8 +51,6 @@ scalacOptions ++= Seq(
   "11",
 )
 
-(ThisBuild / playBuildRepoName) := "play-doc"
-
 addCommandAlias(
   "validateCode",
   List(

project/Omnidoc.scala

@@ -0,0 +1,55 @@
+import sbt.*
+import sbt.Keys.*
+import sbt.Package.ManifestAttributes
+
+/**
+ * This AutoPlugin adds the `Omnidoc-Source-URL` key on the MANIFEST.MF of artifact-sources.jar so later Omnidoc can use
+ * that value to link scaladocs to GitHub sources.
+ */
+object Omnidoc extends AutoPlugin {
+
+  object autoImport {
+    lazy val omnidocSnapshotBranch = settingKey[String]("Git branch for development versions")
+    lazy val omnidocPathPrefix     = settingKey[String]("Prefix before source directory paths")
+    lazy val omnidocSourceUrl      = settingKey[Option[String]]("Source URL for scaladoc linking")
+  }
+
+  val repoName = "play-doc"
+
+  val omnidocGithubRepo: Option[String] = Some(s"playframework/${repoName}")
+
+  val omnidocTagPrefix: Option[String] = Some("")
+
+  val SourceUrlKey = "Omnidoc-Source-URL"
+
+  override def requires = sbt.plugins.JvmPlugin
+
+  override def trigger = noTrigger
+
+  import autoImport.*
+
+  override def projectSettings = Seq(
+    omnidocSourceUrl := omnidocGithubRepo.map { repo =>
+      val development: String = (omnidocSnapshotBranch ?? "main").value
+      val tagged: String      = omnidocTagPrefix.getOrElse("v") + version.value
+      val tree: String        = if (isSnapshot.value) development else tagged
+      val prefix: String      = "/" + (omnidocPathPrefix ?? "").value
+      val path: String = {
+        val buildDir: File      = (ThisBuild / baseDirectory).value
+        val projDir: File       = baseDirectory.value
+        val rel: Option[String] = IO.relativize(buildDir, projDir)
+        rel match {
+          case None if buildDir == projDir => ""                // Same dir (sbt 0.13)
+          case Some("")                    => ""                // Same dir (sbt 1.0)
+          case Some(childDir)              => prefix + childDir // Child dir
+          case None                        => ""                // Disjoint dirs (Rich: I'm not sure if this can happen)
+        }
+      }
+      s"https://github.com/${repo}/tree/${tree}${path}"
+    },
+    Compile / packageSrc / packageOptions ++= omnidocSourceUrl.value.toSeq.map { url =>
+      ManifestAttributes(SourceUrlKey -> url)
+    }
+  )
+
+}

project/plugins.sbt

@@ -1,4 +1,3 @@
-addSbtPlugin("com.typesafe.play" % "interplay"      % "3.1.6")
 addSbtPlugin("com.typesafe.play" % "sbt-twirl"      % "1.6.0")
 addSbtPlugin("org.scalameta"     % "sbt-scalafmt"   % "2.5.2")
 addSbtPlugin("com.github.sbt"    % "sbt-ci-release" % "1.5.12")