Add option to run single tests from community build

Author: romanowski

community-build/src/scala/dotty/communitybuild/Main.scala

@@ -19,10 +19,34 @@ object Main:
         e.printStackTrace()
         Nil
 
+  def withProjects[T](names: Seq[String], opName: String)(op: CommunityProject => Unit): Unit =
+    val missing = names.filterNot(projectMap.contains)
+    if missing.nonEmpty then
+      println(s"Missing projects: ${missing.mkString(", ")}. All projects: ${allProjects.mkString(", ")}")
+      sys.exit(1)
+
+    val failed = names.flatMap( o =>
+      try
+        op(projectMap(o))
+        None
+      catch case e: Throwable =>
+        e.printStackTrace()
+        Some(o)
+    )
+
+    if failed.nonEmpty then
+      println(s"$opName failed for ${failed.mkString(", ")}")
+      sys.exit(1)
+
   /** Allows running various commands on community build projects. */
   def main(args: Array[String]): Unit =
     args.toList match
-      case "publish" :: name :: Nil =>
+      case "publish" :: names  =>
+        withProjects(names, "Publishing")(_.publish())
+
+      case "build" :: names =>
+        withProjects(names, "Build")(_.build())
+
       case "doc" :: "all" :: destStr :: Nil =>
         val dest = Paths.get(destStr)
         Seq("rm", "-rf", destStr).!
@@ -82,7 +106,7 @@ object Main:
 
       case args =>
         println("USAGE: <COMMAND> <PROJECT NAME>")
-        println("COMMAND is one of: publish doc")
+        println("COMMAND is one of: publish doc run")
         println("Available projects are:")
         allProjects.foreach { k =>
           println(s"\t${k.project}")

community-build/src/scala/dotty/communitybuild/projects.scala

@@ -84,6 +84,10 @@ sealed trait CommunityProject:
     if exitCode != 0 then
       throw RuntimeException(s"Doc command exited with code $exitCode for project $project. Project details:\n$this")
 
+  final def build(): Int = exec(projectDir, binaryName, buildCommands: _*)
+
+  final def buildCommands = runCommandsArgs :+ testCommand
+
 end CommunityProject
 
 final case class MillCommunityProject(

community-build/test/scala/dotty/communitybuild/CommunityBuildTest.scala

@@ -22,7 +22,7 @@ abstract class CommunityBuildTest:
    */
   extension (self: CommunityProject) def run()(using suite: CommunityBuildTest) =
     self.dependencies.foreach(_.publish())
-    suite.test(self.project, self.binaryName, self.runCommandsArgs :+ self.testCommand)
+    suite.test(self.project)
 
   /** Build the given project with the published local compiler and sbt plugin.
    *
@@ -34,9 +34,12 @@ abstract class CommunityBuildTest:
    *                    a build tool like SBT or Mill
    *  @param arguments  Arguments to pass to the testing program
    */
-  def test(project: String, command: String, arguments: Seq[String]): Unit = {
+  def test(project: String): Unit = {
+    val command = project.binaryName
+    val arguments = project.buildCommands
+
     @annotation.tailrec
-    def execTimes(task: => Int, timesToRerun: Int): Boolean =
+    def execTimes(task: () => Int, timesToRerun: Int): Boolean =
       val exitCode = task
       if exitCode == 0
       then true
@@ -60,7 +63,7 @@ abstract class CommunityBuildTest:
         |""".stripMargin)
     }
 
-    val testsCompletedSuccessfully = execTimes(exec(projectDir, command, arguments: _*), 3)
+    val testsCompletedSuccessfully = execTimes(project.build, 3)
 
     if (!testsCompletedSuccessfully) {
       fail(s"""