From 06df66a2dfc8cdd77b435790624eeee565edfd5f Mon Sep 17 00:00:00 2001
From: Jakob Odersky <jakob@odersky.com>
Date: Mon, 23 Sep 2019 01:44:06 -0400
Subject: build matrix

---
 .github/workflows/main.yml |  7 +++++--
 build.sc                   | 10 ++++++----
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index d698cd0..6ae537a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,6 +11,9 @@ on:
 jobs:
 
   build:
+    strategy:
+      matrix:
+        scala: ["2.13.1", "2.12.10", "2.11.12"]
     runs-on: ubuntu-latest
     steps:
 
@@ -19,12 +22,12 @@ jobs:
     - uses: jodersky/setup-mill@master
 
     - name: Test
-      run: mill commando.test
+      run: mill -D scala.version=${{matrix.scala}} commando.test
 
     - name: Publish Tag
       if: startsWith(github.ref, 'refs/tags/')
       run: |
         echo "${{secrets.GPG_KEY}}" | gpg --import
-        mill mill.scalalib.PublishModule/publishAll \
+        mill -D scala.version=${{matrix.scala}} mill.scalalib.PublishModule/publishAll \
           --sonatypeCreds "8VNUX6+2:${{secrets.SONATYPE_PASSWORD}}" \
           --publishArtifacts __.publishArtifacts
diff --git a/build.sc b/build.sc
index f9ed49c..5ad0774 100644
--- a/build.sc
+++ b/build.sc
@@ -1,11 +1,13 @@
 import mill._, scalalib._, scalafmt._, scalalib.publish._
 
 object commando extends ScalaModule with ScalafmtModule with PublishModule {
-  //def scalaVersion = T.input {
-    //scala.sys.props.toMap.getOrElse("scala.version", "2.13.1").call() 
-  //}
 
-  def scalaVersion = "2.13.1"
+  def scalaVersion = T.input {
+    sys.props.toMap.get("scala.version") match {
+      case Some(v) => v
+      case None => "2.13.1"
+    }
+  }
 
   object test extends Tests {
     def ivyDeps = Agg(
-- 
cgit v1.2.3