Reintroduce support for Scala 2.11

- Add Github actions
- Use VcsVersion to derive version from tag
- Update mill and add script

.github/workflows/actions.yml

@@ -0,0 +1,51 @@
+name: ci
+
+on:
+  push:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 8
+      - name: Run tests
+        run: ./mill -i -j $(nproc) __.publishArtifacts __.test
+
+  publish-sonatype:
+    if: github.repository == 'com-lihaoyi/acyclic' && contains(github.ref, 'refs/tags/')
+    needs: test
+    runs-on: ubuntu-latest
+    env:
+      SONATYPE_PGP_PRIVATE_KEY: ${{ secrets.SONATYPE_PGP_PRIVATE_KEY }}
+      SONATYPE_PGP_PRIVATE_KEY_PASSWORD: ${{ secrets.SONATYPE_PGP_PRIVATE_KEY_PASSWORD }}
+      SONATYPE_USER: ${{ secrets.SONATYPE_USER }}
+      SONATYPE_PASSWORD: ${{ secrets.SONATYPE_PASSWORD }}
+      LANG: "en_US.UTF-8"
+      LC_MESSAGES: "en_US.UTF-8"
+      LC_ALL: "en_US.UTF-8"
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 8
+      - name: Publish to Maven Central
+        run: |
+          if [[ $(git tag --points-at HEAD) != '' ]]; then
+            echo $SONATYPE_PGP_PRIVATE_KEY | base64 --decode > gpg_key
+            gpg --import --no-tty --batch --yes gpg_key
+            rm gpg_key
+            ./mill -i mill.scalalib.PublishModule/publishAll \
+              --sonatypeCreds $SONATYPE_USER:$SONATYPE_PASSWORD \
+              --gpgArgs --passphrase=$SONATYPE_PGP_PRIVATE_KEY_PASSWORD,--no-tty,--pinentry-mode,loopback,--batch,--yes,-a,-b \
+              --publishArtifacts __.publishArtifacts \
+              --readTimeout 600000 \
+              --awaitTimeout 600000 \
+              --release true \
+              --signed true
+          fi

acyclic/src-2.11/acyclic/plugin/Compat.scala

@@ -0,0 +1,24 @@
+package acyclic.plugin
+
+import acyclic.file
+
+import scala.collection.{SortedSet, SortedSetLike}
+import scala.collection.mutable.Builder
+import scala.collection.generic.{CanBuildFrom, SortedSetFactory}
+import scala.language.implicitConversions
+
+object Compat {
+
+  // from https://github.com/scala/scala-collection-compat/blob/746a7de28223812b19d0d9f68d2253e0c5f655ca/compat/src/main/scala-2.11_2.12/scala/collection/compat/CompatImpl.scala#L8-L11
+  private def simpleCBF[A, C](f: => Builder[A, C]): CanBuildFrom[Any, A, C] = new CanBuildFrom[Any, A, C] {
+    def apply(from: Any): Builder[A, C] = apply()
+    def apply(): Builder[A, C]          = f
+  }
+
+  // from https://github.com/scala/scala-collection-compat/blob/746a7de28223812b19d0d9f68d2253e0c5f655ca/compat/src/main/scala-2.11_2.12/scala/collection/compat/PackageShared.scala#L46-L49
+  implicit def sortedSetCompanionToCBF[A: Ordering,
+                                       CC[X] <: SortedSet[X] with SortedSetLike[X, CC[X]]](
+      fact: SortedSetFactory[CC]): CanBuildFrom[Any, A, CC[A]] =
+    simpleCBF(fact.newBuilder[A])
+
+}

build.sc

@@ -1,9 +1,11 @@
 import mill._, scalalib._, publish._
+import $ivy.`de.tototec::de.tobiasroeser.mill.vcs.version_mill0.9:0.1.1`
+import de.tobiasroeser.mill.vcs.version.VcsVersion
 
-object acyclic extends Cross[AcyclicModule]("2.12.8", "2.13.0")
+object acyclic extends Cross[AcyclicModule]("2.11.12", "2.12.8", "2.13.0")
 class AcyclicModule(val crossScalaVersion: String) extends CrossScalaModule with PublishModule {
   def artifactName = "acyclic"
-  def publishVersion = "0.2.0"
+  def publishVersion = VcsVersion.vcsState().format()
 
   def pomSettings = PomSettings(
     description = artifactName(),
@@ -24,8 +26,8 @@ class AcyclicModule(val crossScalaVersion: String) extends CrossScalaModule with
     def testFrameworks = Seq("utest.runner.Framework")
     def sources = T.sources(millSourcePath / "src", millSourcePath / "resources")
     def ivyDeps = Agg(
-      ivy"com.lihaoyi::utest:0.6.9",
+      ivy"com.lihaoyi::utest:0.7.7",
       ivy"org.scala-lang:scala-compiler:$crossScalaVersion"
     )
   }
-}
+}

mill

@@ -0,0 +1,48 @@
+#!/usr/bin/env sh
+
+# This is a wrapper script, that automatically download mill from GitHub release pages
+# You can give the required mill version with MILL_VERSION env variable
+# If no version is given, it falls back to the value of DEFAULT_MILL_VERSION
+DEFAULT_MILL_VERSION=0.9.5-52-ef6d5d
+
+set -e
+
+if [ -z "$MILL_VERSION" ] ; then
+  if [ -f ".mill-version" ] ; then
+    MILL_VERSION="$(head -n 1 .mill-version 2> /dev/null)"
+  elif [ -f "mill" ] && [ "$BASH_SOURCE" != "mill" ] ; then
+    MILL_VERSION=$(grep -F "DEFAULT_MILL_VERSION=" "mill" | head -n 1 | cut -d= -f2)
+  else
+    MILL_VERSION=$DEFAULT_MILL_VERSION
+  fi
+fi
+
+if [ "x${XDG_CACHE_HOME}" != "x" ] ; then
+  MILL_DOWNLOAD_PATH="${XDG_CACHE_HOME}/mill/download"
+else
+  MILL_DOWNLOAD_PATH="${HOME}/.cache/mill/download"
+fi
+MILL_EXEC_PATH="${MILL_DOWNLOAD_PATH}/${MILL_VERSION}"
+
+version_remainder="$MILL_VERSION"
+MILL_MAJOR_VERSION="${version_remainder%%.*}"; version_remainder="${version_remainder#*.}"
+MILL_MINOR_VERSION="${version_remainder%%.*}"; version_remainder="${version_remainder#*.}"
+
+if [ ! -x "$MILL_EXEC_PATH" ] ; then
+  mkdir -p $MILL_DOWNLOAD_PATH
+  if [ "$MILL_MAJOR_VERSION" -gt 0 ] || [ "$MILL_MINOR_VERSION" -ge 5 ] ; then
+    ASSEMBLY="-assembly"
+  fi
+  DOWNLOAD_FILE=$MILL_EXEC_PATH-tmp-download
+  MILL_DOWNLOAD_URL="https://github.com/lihaoyi/mill/releases/download/${MILL_VERSION%%-*}/$MILL_VERSION${ASSEMBLY}"
+  curl --fail -L -o "$DOWNLOAD_FILE" "$MILL_DOWNLOAD_URL"
+  chmod +x "$DOWNLOAD_FILE"
+  mv "$DOWNLOAD_FILE" "$MILL_EXEC_PATH"
+  unset DOWNLOAD_FILE
+  unset MILL_DOWNLOAD_URL
+fi
+
+unset MILL_DOWNLOAD_PATH
+unset MILL_VERSION
+
+exec $MILL_EXEC_PATH "$@"