From 1c7615c992213e4a9a062bcbdae35d0d6c895d70 Mon Sep 17 00:00:00 2001
From: Eugene Yokota <eed3si9n@gmail.com>
Date: Tue, 5 May 2020 14:45:55 -0400
Subject: [PATCH] Use .sbt/matrix/foo as base directory

Fixes #25
---
 src/main/scala/sbt/internal/ProjectMatrix.scala | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main/scala/sbt/internal/ProjectMatrix.scala b/src/main/scala/sbt/internal/ProjectMatrix.scala
index 31c2bc596..d4e43afc2 100644
--- a/src/main/scala/sbt/internal/ProjectMatrix.scala
+++ b/src/main/scala/sbt/internal/ProjectMatrix.scala
@@ -226,7 +226,9 @@ object ProjectMatrix {
             val other = lookupMatrix(ref)
             resolveMatrixAggregate(other, r)
         }
-        val p = Project(childId, base.getAbsoluteFile)
+        val dotSbtMatrix = new java.io.File(".sbt") / "matrix"
+        IO.createDirectory(dotSbtMatrix)
+        val p = Project(childId, dotSbtMatrix / childId)
           .dependsOn(deps: _*)
           .aggregate(aggs: _*)
           .setPlugins(plugins)