Migrate build to mill

.github/run.sh

@@ -8,7 +8,7 @@ no_lint=0
 while (( $# > 0 )); do
    case "$1" in
    	--help)
-			printf "run.sh [OPTION]... [PKG]\n"
+			printf "run.sh [OPTION]... [DIR]\n"
 			printf "options:\n"
 			printf "\t--help			Show help\n"
 			printf "\t--no-test		Skip tests\n"
@@ -29,21 +29,24 @@ while (( $# > 0 )); do
    esac
 done
 
+./mill __.compile
+
 if (( no_test == 0 )); then
   if [[ -z "$1" ]]; then
-    sbt -warn test
+    ./mill __.test
+  elif ./mill resolve problems["$1"].__.test &>/dev/null; then
+    ./mill problems["$1"].__.test
   else
-    green='\033[1;32m'
+    red='\033[0;31m'
     no_color='\033[0m'
-	printf "Running tests in packages matching: %b%s*%b\n" "$green" "$1" "$no_color"
-    sbt -warn "Test / testOnly $1*"
+	  printf "%bNo tests found in: %s%b\n" "$red" "$1" "$no_color"
   fi
 fi
 
 if (( no_lint == 0 )); then
 	if [[ -z "${CI}" ]]; then
-	  sbt -warn scalafmtAll
+	  ./mill mill.scalalib.scalafmt.ScalafmtModule/reformatAll problems[_].sources
 	else
-	  sbt -warn scalafmtCheckAll
+		./mill mill.scalalib.scalafmt.ScalafmtModule/checkFormatAll problems[_].sources
 	fi
 fi

.github/workflows/ci.yml

@@ -8,12 +8,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up JDK
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: Test
         run: ./.github/run.sh --no-lint
       - name: Lint

.gitignore

@@ -1,33 +1,31 @@
-# macOS
 .DS_Store
+*.class
+*.log
+*~
 
-# sbt
+# idea
+.idea
+.idea_modules
+/.worksheet/
+
+# mill
+out/
+
+.bsp/
+.metals/
+.vscode/
+.bloop/
+
+# SBT
 dist/*
 target/
 lib_managed/
 src_managed/
 project/boot/
-project/project
 project/plugins/project/
-project/local-plugins.sbt
 .history
-.ensime
-.ensime_cache/
-.sbt-scripted/
-local.sbt
+.cache
+.lib/
 
-# Bloop
-.bsp
-
-# VS Code
-.vscode/
-
-# Metals
-.bloop/
-.metals/
-metals.sbt
-
-# IDEA
-.idea
-.idea_modules
-/.worksheet/
+# virtual machine crash logs
+hs_err_pid*

.mill-version

@@ -0,0 +1 @@
+0.12.4

.scalafmt.conf

@@ -1,4 +1,4 @@
-version = "3.7.17"
+version = "3.8.3"
 align.preset = more
 maxColumn = 120
 runner.dialect = scala3

build.mill

@@ -0,0 +1,35 @@
+package build
+
+import mill._, scalalib._, scalafmt._
+import $packages._
+import $file.{versions => v}
+
+val moduleNames = interp.watchValue(os.list(millSourcePath / "problems").map(_.last))
+
+object problems extends Cross[NineNineModule](moduleNames)
+
+trait NineNineModule extends ScalaModule with Cross.Module[String] with ScalafmtModule {
+
+  val scalaVersion = v.scalaVersion
+  def millSourcePath = super.millSourcePath / crossValue
+
+  def scalacOptions: T[Seq[String]] = Seq(
+    "-encoding", "UTF-8",
+    "-feature",
+    "-Werror",
+    "-explain",
+    "-deprecation",
+    "-unchecked",
+    "-Wunused:all",
+    "-rewrite",
+    "-indent",
+    "-source", "future",
+  )
+
+  object test extends ScalaTests with TestModule.Munit {
+   def ivyDeps = Agg(
+     ivy"org.scalameta::munit:${v.munitVersion}",
+     ivy"org.scalameta::munit-scalacheck:${v.munitScalaCheckVersion}",
+   )
+  }
+}