Cross-build with Scala 3.2.2 (#332)

Take macro implementations from izumi

Subsumes #181

build.sbt

@@ -82,24 +82,31 @@ val scalaOpts = scalacOptions ++= ((isSnapshot.value, scalaVersion.value) match
     "-Wvalue-discard",
     "-Wunused:_",
   )
+  case (_, ScalaVersions.scala_3) => Seq(
+    "-no-indent",
+    "-explain",
+  )
   case (_, _) => Seq.empty
 })
 
 lazy val sbtmeta = (project in file("sbtmeta"))
   .settings(
-    crossScalaVersions := Seq(ScalaVersions.scala_213, ScalaVersions.scala_212),
+    crossScalaVersions := Seq(ScalaVersions.scala_3, ScalaVersions.scala_213, ScalaVersions.scala_212),
     scalaVersion := crossScalaVersions.value.head,
-    libraryDependencies += "org.scala-lang" % "scala-reflect" % scalaVersion.value % Provided,
+    libraryDependencies ++= {
+      if (scalaVersion.value.startsWith("2"))
+        Seq("org.scala-lang" % "scala-reflect" % scalaVersion.value % Provided)
+      else Seq.empty
+    },
     scalaOpts,
   )
 
 lazy val sbtgen = (project in file("sbtgen"))
   .dependsOn(sbtmeta)
   .settings(
-    crossScalaVersions := Seq(ScalaVersions.scala_213, ScalaVersions.scala_212),
+    crossScalaVersions := Seq(ScalaVersions.scala_3, ScalaVersions.scala_213, ScalaVersions.scala_212),
     scalaVersion := crossScalaVersions.value.head,
-    //    libraryDependencies += "com.github.scopt" %% "scopt" % "4.0.0-RC2",
-    libraryDependencies += "com.github.scopt" %% "scopt" % "3.7.1",
+    libraryDependencies += "com.github.scopt" %% "scopt" % "4.1.0",
     libraryDependencies += "org.scala-lang.modules" %% "scala-collection-compat" % "2.11.0",
     (ThisBuild / libraryDependencies) += "org.scalatest" %% "scalatest" % "3.2.18" % Test,
     scalacOptions ++= Seq(
@@ -216,7 +223,7 @@ lazy val `izumi-sbtgen` = (project in file("."))
         action = { st: State =>
           val extracted = Project.extract(st)
           val ref = extracted.get(`sbt-tests` / thisProjectRef)
-          extracted.runInputTask((ref / (Global / scripted)), "", st)._1
+          extracted.runInputTask(ref / (Global / scripted), "", st)._1
         }
       ),
       setReleaseVersion, // : ReleaseStep

project/ScalaVersions.scala

@@ -1,6 +1,7 @@
 object ScalaVersions {
   val scala_212 = "2.12.18"
   val scala_213 = "2.13.12"
+  val scala_3 = "3.2.2"
 
   val scalaJsVersion = "1.15.0"
   val scalaNativeVersion = "0.4.17"

sbtmeta/src/main/scala/izumi/sbtgen/sbtmeta/ProjectAttributeMacro.scala → sbtmeta/src/main/scala-2/izumi/sbtgen/sbtmeta/ProjectAttributeMacro.scala

@@ -1,46 +1,20 @@
 package izumi.sbtgen.sbtmeta
 
 import java.nio.file.{Path, Paths}
-import java.time.LocalDateTime
 import scala.annotation.tailrec
 import scala.reflect.macros.blackbox
 
 object ProjectAttributeMacro {
 
-  def buildTimestampMacro(c: blackbox.Context)(): c.Expr[LocalDateTime] = {
-    import c.universe._
-
-    val time = LocalDateTime.now()
-    c.Expr[LocalDateTime] {
-      q"{_root_.java.time.LocalDateTime.of(${time.getYear}, ${time.getMonthValue}, ${time.getDayOfMonth}, ${time.getHour}, ${time.getMinute}, ${time.getSecond}, ${time.getNano})}"
-    }
-  }
-
   def extractAttrMacro(c: blackbox.Context)(name: c.Expr[String]): c.Expr[Option[String]] = {
     val nameStr = TreeTools.stringLiteral(c)(c.universe)(name.tree)
     extractAttr(c, nameStr, force = true)
   }
 
-  def extractProjectGroupIdMacro(c: blackbox.Context)(): c.Expr[Option[String]] = {
-    extractAttr(c, "product-group")
-  }
-
-  def extractSbtVersionMacro(c: blackbox.Context)(): c.Expr[Option[String]] = {
-    extractAttr(c, "sbt-version")
-  }
-
-  def extractScalatestVersionMacro(c: blackbox.Context)(): c.Expr[Option[String]] = {
-    extractAttr(c, "scalatest-version")
-  }
-
   def extractScalaVersionsMacro(c: blackbox.Context)(): c.Expr[Option[String]] = {
     extractAttr(c, "scala-versions")
   }
 
-  def extractScalaVersionMacro(c: blackbox.Context)(): c.Expr[Option[String]] = {
-    extractAttr(c, "scala-version")
-  }
-
   def extractProjectVersionMacro(c: blackbox.Context)(): c.Expr[Option[String]] = {
     extractAttr(c, "product-version")
   }

sbtmeta/src/main/scala-2/izumi/sbtgen/sbtmeta/SbtgenMeta.scala

@@ -0,0 +1,13 @@
+package izumi.sbtgen.sbtmeta
+
+import scala.language.experimental.macros
+
+object SbtgenMeta {
+  def projectRoot(): Option[String] = macro ProjectAttributeMacro.findProjectRootMacro
+
+  def extractSbtProjectVersion(): Option[String] = macro ProjectAttributeMacro.extractProjectVersionMacro
+
+  def extractScalaVersions(): Option[String] = macro ProjectAttributeMacro.extractScalaVersionsMacro
+
+  def extractMandatory(name: String): Option[String] = macro ProjectAttributeMacro.extractAttrMacro
+}

sbtmeta/src/main/scala-3/izumi.sbtgen.sbtmeta/BuildAttributes.scala

@@ -0,0 +1,9 @@
+package izumi.sbtgen.sbtmeta
+
+import java.time.LocalDateTime
+
+object BuildAttributes {
+
+  inline def sbtProjectRoot(): Option[String] = ${ BuildAttributesImpl.sbtProjectRoot() }
+
+}

sbtmeta/src/main/scala-3/izumi.sbtgen.sbtmeta/BuildAttributesImpl.scala

@@ -0,0 +1,36 @@
+package izumi.sbtgen.sbtmeta
+
+import java.nio.file.Path
+import java.time.LocalDateTime
+
+import scala.annotation.tailrec
+import scala.quoted.{Expr, Quotes}
+
+object BuildAttributesImpl {
+
+  def sbtProjectRoot()(using quotes: Quotes): Expr[Option[String]] = {
+    import quotes.reflect.*
+
+    val result = SourceFile.current.getJPath
+      .flatMap(findProjectRoot)
+      .map(_.toFile.getCanonicalPath)
+
+    Expr(result)
+  }
+
+  @tailrec
+  private def findProjectRoot(cp: Path): Option[Path] = {
+    if (cp.resolve("build.sbt").toFile.exists()) {
+      Some(cp)
+    } else {
+      val parent = cp.getParent
+
+      if (parent == null || parent == cp.getRoot) {
+        None
+      } else {
+        findProjectRoot(parent)
+      }
+    }
+  }
+
+}

sbtmeta/src/main/scala-3/izumi.sbtgen.sbtmeta/MacroParameters.scala

@@ -0,0 +1,15 @@
+package izumi.sbtgen.sbtmeta
+
+import scala.quoted.{Expr, Quotes, Type}
+
+object MacroParameters {
+
+  inline def scalaCrossVersions(): Option[String] = macroSetting("scala-versions")
+
+  inline def artifactVersion(): Option[String] = macroSetting("product-version")
+
+  inline def macroSetting(inline name: String): Option[String] = {
+    ${ MacroParametersImpl.extractString('{ name }) }
+  }
+
+}

sbtmeta/src/main/scala-3/izumi.sbtgen.sbtmeta/MacroParametersImpl.scala

@@ -0,0 +1,28 @@
+package izumi.sbtgen.sbtmeta
+
+import scala.annotation.experimental
+import scala.quoted.{Expr, Quotes, Type}
+
+@experimental
+object MacroParametersImpl {
+
+  def extractString(name: Expr[String])(using quotes: Quotes): Expr[Option[String]] = {
+    Expr(extract(name.valueOrAbort))
+  }
+
+  def extractBool(name: Expr[String])(using quotes: Quotes): Expr[Option[Boolean]] = {
+    val value = extract(name.valueOrAbort)
+    val isTrue = value.map(_.toLowerCase).map(v => v == "true" || v == "1")
+    Expr(isTrue)
+  }
+
+  private def extract(name: String)(using quotes: Quotes): Option[String] = {
+    import quotes.reflect.*
+    val prefix = s"$name="
+    val value = CompilationInfo.XmacroSettings.filter(_.startsWith(prefix)).map(_.stripPrefix(prefix)).lastOption
+    if (value.isEmpty) {
+      report.info(s"Undefined macro parameter $name, add `-Xmacro-settings:$prefix<value>` into `scalac` options")
+    }
+    value
+  }
+}

sbtmeta/src/main/scala-3/izumi.sbtgen.sbtmeta/SbtgenMeta.scala

@@ -0,0 +1,11 @@
+package izumi.sbtgen.sbtmeta
+
+object SbtgenMeta {
+  inline def projectRoot(): Option[String] = ${ BuildAttributesImpl.sbtProjectRoot() }
+
+  inline def extractSbtProjectVersion(): Option[String] = MacroParameters.artifactVersion()
+
+  inline def extractScalaVersions(): Option[String] = MacroParameters.scalaCrossVersions()
+
+  inline def extractMandatory(inline name: String): Option[String] = MacroParameters.macroSetting(name)
+}