From dfa20f853090c64d7ce4f157a4fa3b574077c483 Mon Sep 17 00:00:00 2001
From: Pat Garrity <pfm@garrity.co>
Date: Sun, 27 Jul 2025 21:14:50 -0500
Subject: [PATCH] Version 0.6.0

---
 README.md                        |  6 ++++++
 src/main/scala/gs/GsKeys.scala   |  4 ++++
 src/main/scala/gs/GsPlugin.scala | 17 ++++++++++++++++-
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index b2850a2..ffcc6e2 100644
--- a/README.md
+++ b/README.md
@@ -16,3 +16,9 @@ addSbtPlugin("gs" % "sbt-garrity-software" % "0.4.0")
 ```scala
 ThisBuild / gsProjectName := "project-name"
 ```
+
+## Publishing
+
+```
+sbt -Dversion=$VERSION -Drelease=true publish
+```
diff --git a/src/main/scala/gs/GsKeys.scala b/src/main/scala/gs/GsKeys.scala
index 1543ebd..2e76ad1 100644
--- a/src/main/scala/gs/GsKeys.scala
+++ b/src/main/scala/gs/GsKeys.scala
@@ -14,4 +14,8 @@ object GsKeys {
     "Name of the project and Git repository."
   )
 
+  lazy val writeScalaVersionToFile = taskKey[Unit](
+    "Task to emit the Scala version used to build this project to a file."
+  )
+
 }
diff --git a/src/main/scala/gs/GsPlugin.scala b/src/main/scala/gs/GsPlugin.scala
index 44b2dc5..1970634 100644
--- a/src/main/scala/gs/GsPlugin.scala
+++ b/src/main/scala/gs/GsPlugin.scala
@@ -1,5 +1,8 @@
 package gs
 
+import java.nio.charset.StandardCharsets
+import java.nio.file.Files
+import java.nio.file.Paths
 import sbt._
 import sbt.Keys._
 
@@ -10,6 +13,8 @@ object GsPlugin extends AutoPlugin {
 
   import autoImport._
 
+  val ScalaVersionFile: String = ".scala-version"
+
   override def projectSettings: Seq[Setting[_]] = Seq(
     publishMavenStyle           := true,
     Test / Keys.publishArtifact := false,
@@ -33,7 +38,17 @@ object GsPlugin extends AutoPlugin {
     },
     scalacOptions := {
       val prev = Keys.scalacOptions.value
-      prev ++ Gs.CompilerOptions
+      (prev ++ Gs.CompilerOptions).distinct
+    }
+  )
+
+  override lazy val buildSettings: Seq[Setting[_]] = Seq(
+    writeScalaVersionToFile := {
+      val outputFile = ScalaVersionFile
+      Files.write(
+        Paths.get(outputFile),
+        scalaVersion.value.getBytes(StandardCharsets.UTF_8)
+      )
     }
   )