use coursier instead of sbt for Scala 3 scripts

advance

@@ -6,5 +6,11 @@
 #   % ./advance scalacheck scalatest specs2
 
 set -e
-cd scripts
-sbt -Dsbt.supershell=false -error "runMain advance $*" < /dev/null
+
+# as per https://github.com/coursier/coursier/issues/2058
+cs launch \
+  scala3-compiler:3+ \
+  -M dotty.tools.MainGenericRunner \
+  --extra-jars $(cs fetch --intransitive org.scala-lang.modules:scala-parallel-collections_3:1.0.3) \
+  --extra-jars $(cs fetch --intransitive com.github.pathikrit:better-files_2.13:3.9.1) \
+  -- scripts/Advance.scala $*

narrow

@@ -8,5 +8,10 @@
 # dependencies.txt is the source of truth for what dependencies to use
 
 set -e
-cd scripts
-sbt -Dsbt.supershell=false -error "runMain narrow $*" < /dev/null
+
+# as per https://github.com/coursier/coursier/issues/2058
+cs launch \
+  scala3-compiler:3+ \
+  -M dotty.tools.MainGenericRunner \
+  --extra-jars $(cs fetch --intransitive com.github.pathikrit:better-files_2.13:3.9.1) \
+  -- scripts/Narrow.scala $*

run.sh

@@ -198,8 +198,13 @@ BUILD_ID="$(grep '^\[info\]  uuid = ' "dbuild-${DBUILDVERSION}/dbuild.out" | sed
 rm_project_builds
 
 # report summary information (line counts, green project counts, ...?)
-cd scripts
-sbt -Dsbt.supershell=false -Dlog4j.configurationFile=log4j.properties -error "runMain report ../dbuild-${DBUILDVERSION}/dbuild.out" < /dev/null | tee ../report.html
+# (Scala 3 script support is as per https://github.com/coursier/coursier/issues/2058)
+cs launch \
+  scala3-compiler:3+ \
+  -M dotty.tools.MainGenericRunner \
+  -D log4j.configurationFile=scripts/log4j.properties \
+  -- scripts/Report.scala dbuild-${DBUILDVERSION}/dbuild.out \
+  | tee report.html
 
 # we've captured $STATUS above, but in this version of the script, it isn't used,
 # instead the reporting stuff is in charge of calling sys.exit if it decides to

scripts/Advance.scala

@@ -1,7 +1,7 @@
 import better.files._
+import scala.collection.parallel.CollectionConverters._  // for .par
 
 @main def advance(args: String*) =
-  import scala.collection.parallel.CollectionConverters._
   // regexes for matching first line of each project's config
   // note that we require an explicit tag or branch name,
   // or a SHA (which must be the whole 40 characters).
@@ -11,7 +11,7 @@ import better.files._
   val GitHub = """// (https://github.com/\S*.git)#(\S*)(\s*.*)""".r
   val Ivy = """// ivy:.*""".r
   for
-    file <- File("../proj").list(_.extension == Some(".conf")).toSeq.par
+    file <- File("proj").list(_.extension == Some(".conf")).toSeq.par
     if args.isEmpty || args.contains(file.nameWithoutExtension)
   do
     val lines = file.lines.to(Vector)

scripts/Narrow.scala

@@ -4,7 +4,7 @@ import better.files._
 
   // read dependency information
   val tree: Map[String, Set[String]] =
-    val deps = File("../dependencies.txt")
+    val deps = File("dependencies.txt")
     val Regex = """(\S+): (.*)""".r
     deps.lines.map{
       case Regex(proj, deps) =>
@@ -18,7 +18,7 @@ import better.files._
       -- Set("scala", "cloc-plugin"))
 
   // write results
-  val projs = File("../projs.conf")
+  val projs = File("projs.conf")
   projs.clear()
   projs.append(
     """|build += {

scripts/Report.scala

@@ -137,17 +137,17 @@ object SplitLog:
   val EndBuild = """\[([^\]]+)\] --== End Building .+ ==--""".r
 
   def apply(log: io.Source): Unit =
-    val dir = java.io.File("../logs")
+    val dir = java.io.File("logs")
     dir.mkdirs()
     val lines = log.getLines
     while lines.hasNext do
       lines.next match
         case BeginDependencies() =>
-          slurp(lines, makeWriter("../logs/_dependencies.log"), EndDependencies)
+          slurp(lines, makeWriter("logs/_dependencies.log"), EndDependencies)
         case BeginExtract(name) =>
-          slurp(lines, makeWriter(s"../logs/$name-extract.log"), EndExtract)
+          slurp(lines, makeWriter(s"logs/$name-extract.log"), EndExtract)
         case BeginBuild(name) =>
-          slurp(lines, makeWriter(s"../logs/$name-build.log"), EndBuild)
+          slurp(lines, makeWriter(s"logs/$name-build.log"), EndBuild)
         case _ =>
 
   import java.io.PrintWriter
@@ -178,10 +178,10 @@ object UpdateDependencies:
   val Line1 = """\[info\] Project (\S+)""".r
   val Line2 = """\[info\]   depends on: (.*)""".r
   def apply(): Unit =
-    val inFile = java.io.File("../logs/_dependencies.log")
+    val inFile = java.io.File("logs/_dependencies.log")
     if inFile.exists then
       val in = io.Source.fromFile(inFile)
-      val out = SplitLog.makeWriter("../dependencies.txt")
+      val out = SplitLog.makeWriter("dependencies.txt")
       val tuples =
         for Seq(Line1(project), Line2(depends)) <- in.getLines.grouped(2).toSeq
         yield (project, depends)