Add missing build commands

build.sbt

@@ -3,6 +3,7 @@ import sbt.Def
 import sbt.Reference.display
 import com.softwaremill.SbtSoftwareMillCommon.commonSmlBuildSettings
 import com.softwaremill.Publish.{ossPublishSettings, updateDocs}
+import complete.DefaultParsers._
 
 val scala212 = "2.12.16"
 val scala213 = "2.13.8"
@@ -14,6 +15,14 @@ val scalatestVersion = "3.2.12"
 val specs2Version = "4.16.1"
 val smlTaggingVersion = "2.3.3"
 
+val scopesDescription = "Scala version can be: 2.12, 2.13, 3; platform: JVM, JS, Native"
+val compileScoped =
+  inputKey[Unit](
+    s"Compiles sources in the given scope. Usage: compileScoped [scala version] [platform]. $scopesDescription"
+  )
+val testScoped =
+  inputKey[Unit](s"Run tests in the given scope. Usage: testScoped [scala version] [platform]. $scopesDescription")
+
 lazy val commonSettings: Seq[Def.Setting[_]] = commonSmlBuildSettings ++ ossPublishSettings ++ Seq(
   organization := "com.softwaremill.diffx",
   scmInfo := Some(ScmInfo(url("https://github.com/softwaremill/diffx"), "[email protected]:softwaremill/diffx.git")),
@@ -272,6 +281,19 @@ val allAggregates =
 def filterProject(p: String => Boolean) =
   ScopeFilter(inProjects(allAggregates.filter(pr => p(display(pr.project))): _*))
 
+def filterByVersionAndPlatform(scalaVersionFilter: String, platformFilter: String) = filterProject { projectName =>
+  val byPlatform =
+    if (platformFilter == "JVM") !projectName.contains("JS") && !projectName.contains("Native")
+    else projectName.contains(platformFilter)
+  val byVersion = scalaVersionFilter match {
+    case "2.13" => !projectName.contains("2_12") && !projectName.contains("3")
+    case "2.12" => projectName.contains("2_12")
+    case "3"    => projectName.contains("3")
+  }
+
+  byPlatform && byVersion && !projectName.contains("finatra")
+}
+
 lazy val rootProject = project
   .in(file("."))
   .settings(commonSettings)
@@ -280,6 +302,10 @@ lazy val rootProject = project
     name := "diffx",
     scalaVersion := scalaIdeaVersion,
     testJVM := (Test / test).all(filterProject(p => !p.contains("JS") && !p.contains("Native"))).value,
-    testJS := (Test / test).all(filterProject(_.contains("JS"))).value
+    testJS := (Test / test).all(filterProject(_.contains("JS"))).value,
+    compileScoped := Def.inputTaskDyn {
+      val args = spaceDelimited("<arg>").parsed
+      Def.taskDyn((Compile / compile).all(filterByVersionAndPlatform(args.head, args(1))))
+    }.evaluated
   )
   .aggregate(allAggregates: _*)