Add support for Scala3

src/main/scala/sbtunidoc/ScalaUnidocPlugin.scala

@@ -32,7 +32,11 @@ object ScalaUnidocPlugin extends AutoPlugin {
   )
 
   lazy val allScalaSources = Def.taskDyn {
-    val f = (unidoc / unidocScopeFilter).value
-    sources.all(f)
+    val f = (unidocScopeFilter in unidoc).value
+    if(ScalaArtifacts.isScala3(scalaVersion.value)) {
+      tastyFiles.all(f) // Since Scaladoc 3 works on TASTy files
+    } else {
+      sources.all(f)
+    }
   }
 }

src/main/scala/sbtunidoc/Unidoc.scala

@@ -14,7 +14,9 @@ object Unidoc {
   def apply(cache: File, cs: Compilers, srcs: Seq[File], cp: Classpath,
             sOpts: Seq[String], jOpts: Seq[String], xapis: Map[File, URL], maxErrors: Int,
             out: File, config: Configuration, s: TaskStreams, spm: Seq[xsbti.Position => Option[xsbti.Position]], converter: FileConverter): File = {
-    val hasScala = srcs.exists(_.name.endsWith(".scala"))
+    val hasScala = srcs.exists(_.name.endsWith(".scala")) ||
+      srcs.exists(_.name.endsWith(".tasty")) || // Condition for Scaladoc 3
+      sOpts.contains("-siteroot") // Condition for Scaladoc 3
     val hasJava = srcs.exists(_.name.endsWith(".java"))
     val label = nameForSrc(config.name)
     val reporter = new ManagedLoggedReporter(

src/sbt-test/unidoc/scala3-unidoc/.bsp/sbt.json

@@ -0,0 +1 @@
+{"name":"sbt","version":"1.5.3","bspVersion":"2.0.0-M5","languages":["scala"],"argv":["/Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home/jre/bin/java","-Xms100m","-Xmx100m","-classpath","/usr/local/Cellar/sbt/1.5.3/libexec/bin/sbt-launch.jar","xsbt.boot.Boot","-bsp","--sbt-launch-jar=/usr/local/Cellar/sbt/1.5.3/libexec/bin/sbt-launch.jar"]}

src/sbt-test/unidoc/scala3-unidoc/a/A.scala

@@ -0,0 +1,3 @@
+package example
+
+class A

src/sbt-test/unidoc/scala3-unidoc/b/B.scala

@@ -0,0 +1,3 @@
+package example
+
+class B

src/sbt-test/unidoc/scala3-unidoc/build.sbt

@@ -0,0 +1,24 @@
+val commonSettings = Seq(
+  scalaVersion := "3.0.2"
+)
+
+lazy val a = project.settings(
+  commonSettings
+)
+
+lazy val b = project.settings(
+  commonSettings
+)
+
+lazy val c = project.settings(
+  commonSettings
+)
+
+lazy val root = project.in(file(".")).settings(
+  commonSettings,
+  unidocProjectFilter in (ScalaUnidoc, unidoc) := inAnyProject -- inProjects(c)
+).enablePlugins(
+  ScalaUnidocPlugin
+).aggregate(
+  a, b, c
+)

src/sbt-test/unidoc/scala3-unidoc/c/C.scala

@@ -0,0 +1,3 @@
+package example
+
+class C

src/sbt-test/unidoc/scala3-unidoc/project/plugin.sbt

@@ -0,0 +1 @@
+addSbtPlugin("com.eed3si9n" % "sbt-unidoc" % System.getProperty("plugin.version"))

src/sbt-test/unidoc/scala3-unidoc/test

@@ -0,0 +1,4 @@
+> unidoc
+$ exists target/scala-3.0.2/unidoc/api/example/A.html
+$ exists target/scala-3.0.2/unidoc/api/example/B.html
+-$ exists target/scala-3.0.2/unidoc/api/example/C.html