From a580823a797347bb5d8769bcda3eb112a33cfb7e Mon Sep 17 00:00:00 2001
From: Joan Goyeau <jgoyeau@netflix.com>
Date: Tue, 26 Sep 2023 09:17:21 -0400
Subject: [PATCH] Ability to lift a ScalaVersion from a String

---
 .../scalacoptions/ScalaVersion.scala          | 11 ++++
 .../scalacoptions/ScalaVersionSuite.scala     | 56 +++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 lib/src/test/scala/org/typelevel/scalacoptions/ScalaVersionSuite.scala

diff --git a/lib/src/main/scala/org/typelevel/scalacoptions/ScalaVersion.scala b/lib/src/main/scala/org/typelevel/scalacoptions/ScalaVersion.scala
index 74b577e..d2bedf1 100644
--- a/lib/src/main/scala/org/typelevel/scalacoptions/ScalaVersion.scala
+++ b/lib/src/main/scala/org/typelevel/scalacoptions/ScalaVersion.scala
@@ -44,6 +44,17 @@ object ScalaVersion {
   val V3_3_0   = ScalaVersion(3, 3, 0)
   val V3_3_1   = ScalaVersion(3, 3, 1)
 
+  private val versionRegex = raw"""(\d+)\.(\d+)\.(\d+)(?:-.*)?""".r
+  def fromString(version: String): Either[IllegalArgumentException, ScalaVersion] =
+    version match {
+      case versionRegex(major, minor, patch) =>
+        Right(ScalaVersion(major.toLong, minor.toLong, patch.toLong))
+      case _ => Left(new IllegalArgumentException(s"Scala version $version not recognized"))
+    }
+
+  def unsafeFromString(version: String): ScalaVersion =
+    fromString(version).fold(throw _, identity)
+
   implicit val scalaVersionOrdering: Ordering[ScalaVersion] =
     Ordering.by(version => (version.major, version.minor, version.patch))
 }
diff --git a/lib/src/test/scala/org/typelevel/scalacoptions/ScalaVersionSuite.scala b/lib/src/test/scala/org/typelevel/scalacoptions/ScalaVersionSuite.scala
new file mode 100644
index 0000000..20476e8
--- /dev/null
+++ b/lib/src/test/scala/org/typelevel/scalacoptions/ScalaVersionSuite.scala
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2022 Typelevel
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.typelevel.scalacoptions
+
+import org.scalacheck.Gen
+import org.scalacheck.Prop.forAll
+
+class ScalaVersionSuite extends munit.ScalaCheckSuite {
+  val versionGen = Gen.chooseNum(0L, 20L)
+
+  property("fromString parse a version") {
+    forAll(versionGen, versionGen, versionGen) {
+      (currentMaj: Long, currentMin: Long, currentPatch: Long) =>
+        val version = ScalaVersion.fromString(s"$currentMaj.$currentMin.$currentPatch")
+        assertEquals(version, Right(ScalaVersion(currentMaj, currentMin, currentPatch)))
+    }
+  }
+
+  property("fromString parse an RC version") {
+    forAll(versionGen, versionGen, versionGen) {
+      (currentMaj: Long, currentMin: Long, currentPatch: Long) =>
+        val version = ScalaVersion.fromString(s"$currentMaj.$currentMin.$currentPatch-RC3")
+        assertEquals(version, Right(ScalaVersion(currentMaj, currentMin, currentPatch)))
+    }
+  }
+
+  property("fromString parse a NIGHTLY version") {
+    forAll(versionGen, versionGen, versionGen) {
+      (currentMaj: Long, currentMin: Long, currentPatch: Long) =>
+        val version = ScalaVersion.fromString(s"$currentMaj.$currentMin.$currentPatch-RC1-bin-20231106-f61026d-NIGHTLY")
+        assertEquals(version, Right(ScalaVersion(currentMaj, currentMin, currentPatch)))
+    }
+  }
+
+  property("fromString parse a commit version") {
+    forAll(versionGen, versionGen, versionGen) {
+      (currentMaj: Long, currentMin: Long, currentPatch: Long) =>
+        val version = ScalaVersion.fromString(s"$currentMaj.$currentMin.$currentPatch-bin-80514f7")
+        assertEquals(version, Right(ScalaVersion(currentMaj, currentMin, currentPatch)))
+    }
+  }
+}