Added monocle.

Author: dotbg

.gitmodules

@@ -184,3 +184,6 @@
 [submodule "community-build/community-projects/akka"]
 	path = community-build/community-projects/akka
 	url = https://github.com/dotty-staging/akka.git
+[submodule "community-build/community-projects/Monocle"]
+	path = community-build/community-projects/Monocle
+	url = https://github.com/optics-dev/Monocle.git

community-build/community-projects/Monocle

@@ -1,8 +1,9 @@
 package dotty.communitybuild
 
 import java.nio.file._
-import java.io.{PrintWriter, File}
+import java.io.{BufferedReader, InputStreamReader, PrintWriter, File}
 import java.nio.charset.StandardCharsets.UTF_8
+import scala.collection.Iterator
 
 lazy val communitybuildDir: Path = Paths.get(sys.props("user.dir"))
 
@@ -16,14 +17,25 @@ lazy val sbtPluginFilePath: String =
   communitybuildDir.resolve("sbt-dotty-sbt").toAbsolutePath().toString()
 
 def log(msg: String) = println(Console.GREEN + msg + Console.RESET)
+def error(msg: String) = println(Console.RED + msg + Console.RESET)
 
 /** Executes shell command, returns false in case of error. */
 def exec(projectDir: Path, binary: String, arguments: String*): Int =
   val command = binary +: arguments
   log(command.mkString(" "))
   val builder = new ProcessBuilder(command: _*).directory(projectDir.toFile).inheritIO()
+  
   val process = builder.start()
   val exitCode = process.waitFor()
+  if (exitCode != 0) {
+    val errorStream = process.getErrorStream()
+    val isReader = new InputStreamReader(process.getErrorStream())
+    val br = new BufferedReader(isReader)
+    Iterator.continually(br.readLine()).takeWhile(_ != null).foreach(error(_))
+    br.close()
+    isReader.close()
+    errorStream.close()
+  }
   exitCode
 
 
@@ -660,6 +672,13 @@ object projects:
     dependencies = List(scalatest, scalatestplusJunit, scalatestplusScalacheck)
   )
 
+  lazy val monocle = SbtCommunityProject(
+    project = "Monocle",
+    sbtTestCommand = "monocleJVM/test",
+    dependencies = List(cats, shapeless, munit, discipline, disciplineMunit)
+  )
+
+
 end projects
 
 def allProjects = List(
@@ -725,6 +744,7 @@ def allProjects = List(
   projects.izumiReflect,
   projects.perspective,
   projects.akka,
+  projects.monocle,
 )
 
 lazy val projectMap = allProjects.groupBy(_.project)

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

@@ -92,6 +92,8 @@ class CommunityBuildTestA extends CommunityBuildTest:
   @Test def fastparse = projects.fastparse.run()
   @Test def geny = projects.geny.run()
   @Test def izumiReflect = projects.izumiReflect.run()
+  
+  @Test def monocle = projects.monocle.run()
   @Test def oslib = projects.oslib.run()
   // @Test def oslibWatch = projects.oslibWatch.run()
   @Test def pprint = projects.pprint.run()
@@ -158,3 +160,4 @@ class CommunityBuildTestB extends CommunityBuildTest:
 end CommunityBuildTestB
 
 class TestCategory
+