added directives and preprocessing for the directives

Author: Perklone

modules/build/src/main/scala/scala/build/Project.scala

@@ -50,6 +50,26 @@ final case class Project(
         bridgeJars = scalaCompiler0.bridgeJarsOpt.map(_.map(_.toNIO).toList)
       )
     }
+
+    val sourceGen: BloopConfig.SourceGenerator = {
+      val command = "/Users/kiki/Kerja/scala-cli/testing-a/source-generator.py"
+
+
+      val sourceGlobs = BloopConfig.SourcesGlobs(
+        (os.root / "Users" / "kiki" / "Kerja" / "scala-cli" / "testing-a" / "generator-inputs").toNIO,
+        None,
+        List("glob:test.in"),
+        Nil
+      )
+
+      BloopConfig.SourceGenerator(
+        List(sourceGlobs),
+        (os.root / "Users" / "kiki" / "Kerja" / "scala-cli" / "testing-a" / "source-generator-a").toNIO,
+        List("python3",command)
+        // Nil
+      )
+    }
+
     baseBloopProject(
       projectName,
       directory.toNIO,
@@ -65,7 +85,8 @@ final case class Project(
         platform = Some(platform),
         `scala` = scalaConfigOpt,
         java = Some(BloopConfig.Java(javacOptions)),
-        resolution = resolution
+        resolution = resolution,
+        sourceGenerators = Some(List(sourceGen))
       )
   }
 

modules/build/src/main/scala/scala/build/preprocessing/directives/DirectivesPreprocessingUtils.scala

@@ -30,6 +30,7 @@ object DirectivesPreprocessingUtils {
       directives.ScalaJs.handler,
       directives.ScalaNative.handler,
       directives.ScalaVersion.handler,
+      directives.SourceGenerator.handler,
       directives.Sources.handler,
       directives.Tests.handler
     ).map(_.mapE(_.buildOptions))

modules/directives/src/main/scala/scala/build/preprocessing/directives/SourceGenerator.scala

@@ -0,0 +1,29 @@
+package scala.build.preprocessing.directives
+
+import scala.build.directives.*
+import scala.build.errors.BuildException
+import scala.build.options.BuildOptions
+import scala.cli.commands.SpecificationLevel
+
+@DirectiveExamples("//> using generator")
+@DirectiveUsage(
+    "//> using generator", 
+    "`//> using generator`"
+)
+@DirectiveDescription("Generate code using Source Generator")
+@DirectiveLevel(SpecificationLevel.EXPERIMENTAL)
+final case class SourceGenerator (
+    placeHolderGenerator: Boolean = false
+) extends HasBuildOptions {
+    def buildOptions: Either[BuildException, BuildOptions] = {
+        val buildOpt = BuildOptions(
+            useBuildServer = Some(true)
+        )
+        Right(buildOpt)
+    }
+}
+
+
+object SourceGenerator {
+  val handler: DirectiveHandler[SourceGenerator] = DirectiveHandler.derive
+}