Add Scala 3 support

README.md

@@ -69,7 +69,7 @@ This can be set as project property.
 
 ##### Scala version configuration
 
-Plugin supports Scala 2.12.x and 2.13.x versions by automatically loading and configuring matching `scalac-scoverage-plugin` Scalac SCoverage Plugin artifact. For this to work Scala version has to be set. It can be done by defining `scalaVersion` plugin configuration parameter or `scala.version` project property. Without this setting, coverage will not be calculated. 
+Plugin supports Scala 2.12.8+, 2.13.0+ and 3.2.0+ versions by automatically loading and configuring matching `scalac-scoverage-plugin` Scalac SCoverage Plugin artifact. For this to work Scala version has to be set. It can be done by defining `scalaVersion` plugin configuration parameter or `scala.version` project property. Without this setting, coverage will not be calculated. 
 
 ```xml
 <project>

src/it/integration_tests_parent/pom.xml

@@ -26,12 +26,13 @@
         <scala.compat.version>2.13</scala.compat.version>
         <scala.minor.version>12</scala.minor.version>
         <scala.version>${scala.compat.version}.${scala.minor.version}</scala.version>
+        <scala.library.artifact.id>scala-library</scala.library.artifact.id>
     </properties>
 
     <dependencies>
         <dependency>
             <groupId>org.scala-lang</groupId>
-            <artifactId>scala-library</artifactId>
+            <artifactId>${scala.library.artifact.id}</artifactId>
             <version>${scala.version}</version>
         </dependency>
 

src/it/test_ScalaMavenPlugin_Scala32Plus_ScalaTest/invoker.properties

@@ -0,0 +1 @@
+invoker.goals=clean verify site -e -ntp

src/it/test_ScalaMavenPlugin_Scala32Plus_ScalaTest/pom.xml

@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>it.scoverage-maven-plugin</groupId>
+        <artifactId>integration_tests_parent</artifactId>
+        <version>1.0-SNAPSHOT</version>
+        <relativePath>../integration_tests_parent/pom.xml</relativePath>
+    </parent>
+
+    <artifactId>test_ScalaMavenPlugin_Scala32Plus_ScalaTest</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <name>Test Scoverage Report using scala-maven-plugin, Scala 3.2+ and ScalaTest</name>
+    <description>Test Scoverage Report using scala-maven-plugin, Scala 3.2+ and ScalaTest</description>
+
+    <properties>
+        <scala.compat.version>3</scala.compat.version>
+        <scala.version>3.3.1</scala.version>
+        <scala.library.artifact.id>scala3-library_3</scala.library.artifact.id>
+    </properties>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+            </plugin>
+            <plugin>
+                <groupId>net.alchim31.maven</groupId>
+                <artifactId>scala-maven-plugin</artifactId>
+            </plugin>
+            <plugin>
+                <groupId>org.scalatest</groupId>
+                <artifactId>scalatest-maven-plugin</artifactId>
+            </plugin>
+            <plugin>
+                <groupId>@project.groupId@</groupId>
+                <artifactId>@project.artifactId@</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/it/test_ScalaMavenPlugin_Scala32Plus_ScalaTest/src/main/scala/HelloServiceScala.scala

@@ -0,0 +1,6 @@
+package service
+
+object HelloServiceScala {
+  def hello = { "Hello" }
+
+}

src/it/test_ScalaMavenPlugin_Scala32Plus_ScalaTest/src/test/scala/HelloServiceScalaTest.scala

@@ -0,0 +1,12 @@
+package service
+
+import org.scalatest.wordspec.AnyWordSpec
+
+class HelloServiceScalaTest extends AnyWordSpec {
+
+  "HelloService" should {
+    "say hello" in {
+      assert(HelloServiceScala.hello == "Hello")
+    }
+  }
+}

src/it/test_ScalaMavenPlugin_Scala32Plus_ScalaTest/validate.groovy

@@ -0,0 +1,19 @@
+try {
+
+    def logFile = new File(basedir, "build.log")
+    def lines = logFile.readLines()
+    assert lines.contains("[INFO] Statement coverage.: 100.00%")
+    assert lines.contains("[INFO] Branch coverage....: 100.00%")
+
+    def scoverageFile = new File(basedir, "target/scoverage.xml")
+    assert scoverageFile.exists()
+
+    def reportFile = new File(basedir, "target/site/scoverage/index.html")
+    assert reportFile.exists()
+
+    return true
+
+} catch (Throwable e) {
+    e.printStackTrace()
+    return false
+}

src/it/test_ScalaMavenPlugin_Scala32Plus_ScalaTest_ScalaVersion_Not_Set/invoker.properties

@@ -0,0 +1 @@
+invoker.goals=clean verify site -e -ntp

src/it/test_ScalaMavenPlugin_Scala32Plus_ScalaTest_ScalaVersion_Not_Set/pom.xml

@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>it.scoverage-maven-plugin</groupId>
+        <artifactId>integration_tests_parent</artifactId>
+        <version>1.0-SNAPSHOT</version>
+        <relativePath>../integration_tests_parent/pom.xml</relativePath>
+    </parent>
+
+    <artifactId>test_ScalaMavenPlugin_Scala32Plus_ScalaTest_ScalaVersion_Not_Set</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <name>Test Scoverage Report using scala-maven-plugin, Scala 3.2+ and ScalaTest when scala.version is not set</name>
+    <description>Test Scoverage Report using scala-maven-plugin, Scala 3.2+ and ScalaTest when scala.version is not set</description>
+
+    <properties>
+        <scala.compat.version>3</scala.compat.version>
+        <scala.version/>
+        <scala.library.artifact.id>scala3-library_3</scala.library.artifact.id>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.scala-lang</groupId>
+            <artifactId>${scala.library.artifact.id}</artifactId>
+            <version>3.3.1</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+            </plugin>
+            <plugin>
+                <groupId>net.alchim31.maven</groupId>
+                <artifactId>scala-maven-plugin</artifactId>
+            </plugin>
+            <plugin>
+                <groupId>org.scalatest</groupId>
+                <artifactId>scalatest-maven-plugin</artifactId>
+            </plugin>
+            <plugin>
+                <groupId>@project.groupId@</groupId>
+                <artifactId>@project.artifactId@</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/it/test_ScalaMavenPlugin_Scala32Plus_ScalaTest_ScalaVersion_Not_Set/src/main/scala/HelloServiceScala.scala

@@ -0,0 +1,6 @@
+package service
+
+object HelloServiceScala {
+  def hello = { "Hello" }
+
+}

src/it/test_ScalaMavenPlugin_Scala32Plus_ScalaTest_ScalaVersion_Not_Set/src/test/scala/HelloServiceScalaTest.scala

@@ -0,0 +1,12 @@
+package service
+
+import org.scalatest.wordspec.AnyWordSpec
+
+class HelloServiceScalaTest extends AnyWordSpec {
+
+  "HelloService" should {
+    "say hello" in {
+      assert(HelloServiceScala.hello == "Hello")
+    }
+  }
+}

src/it/test_ScalaMavenPlugin_Scala32Plus_ScalaTest_ScalaVersion_Not_Set/validate.groovy

@@ -0,0 +1,19 @@
+try {
+
+    def logFile = new File(basedir, "build.log")
+    def lines = logFile.readLines()
+    assert lines.contains("[INFO] Statement coverage.: 100.00%")
+    assert lines.contains("[INFO] Branch coverage....: 100.00%")
+
+    def scoverageFile = new File(basedir, "target/scoverage.xml")
+    assert scoverageFile.exists()
+
+    def reportFile = new File(basedir, "target/site/scoverage/index.html")
+    assert reportFile.exists()
+
+    return true
+
+} catch (Throwable e) {
+    e.printStackTrace()
+    return false
+}

src/main/java/org/scoverage/plugin/SCoveragePreCompileMojo.java

@@ -24,9 +24,7 @@
 import java.io.OutputStreamWriter;
 import java.util.*;
 import java.util.stream.Collectors;
-import java.util.stream.Stream;
 
-import edu.emory.mathcs.backport.java.util.Arrays;
 import org.apache.maven.artifact.Artifact;
 import org.apache.maven.artifact.factory.ArtifactFactory;
 import org.apache.maven.artifact.repository.ArtifactRepository;
@@ -228,6 +226,7 @@ public void execute() throws MojoExecutionException
 
         String scalaBinaryVersion = null;
         String resolvedScalaVersion = resolveScalaVersion();
+        boolean scala2 = true;
         if ( resolvedScalaVersion != null )
         {
             if ( "2.12".equals( resolvedScalaVersion ) || resolvedScalaVersion.startsWith( "2.12." ) )
@@ -238,9 +237,14 @@ else if ( "2.13".equals( resolvedScalaVersion ) || resolvedScalaVersion.startsWi
             {
                 scalaBinaryVersion = "2.13";
             }
+            else if ( resolvedScalaVersion.compareTo("3.2.") > 0 ) // Scala 3 is supported from 3.2.0
+            {
+                scalaBinaryVersion = "3";
+                scala2 = false;
+            }
             else
             {
-                getLog().warn( String.format( "Skipping SCoverage execution - unsupported Scala version \"%s\"",
+                getLog().warn( String.format( "Skipping SCoverage execution - unsupported Scala version \"%s\". Supported Scala versions are 2.12.8+, 2.13.0+ and 3.2.0+ .",
                                               resolvedScalaVersion ) );
                 return;
             }
@@ -278,16 +282,18 @@ else if ( "2.13".equals( resolvedScalaVersion ) || resolvedScalaVersion.startsWi
 
         try
         {
-            List<Artifact> pluginArtifacts = getScalaScoveragePluginArtifacts( resolvedScalaVersion, scalaBinaryVersion );
-            Artifact runtimeArtifact = getScalaScoverageRuntimeArtifact( scalaBinaryVersion );
-
-            addScoverageDependenciesToClasspath( runtimeArtifact );
+            List<Artifact> pluginArtifacts = getScalaScoveragePluginArtifacts( resolvedScalaVersion, scalaBinaryVersion, scala2 );
+            if ( scala2 ) // Scala 3 doesn't need scalac-scoverage-runtime
+            {
+                Artifact runtimeArtifact = getScalaScoverageRuntimeArtifact( scalaBinaryVersion );
+                addScoverageDependenciesToClasspath( runtimeArtifact );
+            }
 
-            String arg = DATA_DIR_OPTION + dataDirectory.getAbsolutePath();
+            String arg = ( scala2 ? SCALA2_DATA_DIR_OPTION : SCALA3_COVERAGE_OUT_OPTION ) + dataDirectory.getAbsolutePath();
             String _scalacOptions = quoteArgument( arg );
             String addScalacArgs = arg;
 
-            arg = SOURCE_ROOT_OPTION + project.getBasedir().getAbsolutePath();
+            arg = scala2 ? ( SOURCE_ROOT_OPTION + project.getBasedir().getAbsolutePath() ) : "";
             _scalacOptions = _scalacOptions + SPACE + quoteArgument( arg );
             addScalacArgs = addScalacArgs + PIPE + arg;
 
@@ -305,17 +311,19 @@ else if ( "2.13".equals( resolvedScalaVersion ) || resolvedScalaVersion.startsWi
                 addScalacArgs = addScalacArgs + PIPE + arg;
             }
 
-            if ( highlighting )
+            if ( highlighting && scala2 )
             {
                 _scalacOptions = _scalacOptions + SPACE + "-Yrangepos";
                 addScalacArgs = addScalacArgs + PIPE + "-Yrangepos";
             }
 
-            String _scalacPlugins = pluginArtifacts.stream()
-                    .map(x -> String.format("%s:%s:%s", x.getGroupId(), x.getArtifactId(),x.getVersion())).collect(Collectors.joining(" "));
+            String _scalacPlugins = scala2 ? pluginArtifacts.stream()
+                    .map(x -> String.format("%s:%s:%s", x.getGroupId(), x.getArtifactId(), x.getVersion())).collect(Collectors.joining(" ")) : "";
 
-            arg = PLUGIN_OPTION + pluginArtifacts.stream().map(x -> x.getFile().getAbsolutePath()).collect(Collectors.joining(String.valueOf(java.io.File.pathSeparatorChar)));
-            addScalacArgs = addScalacArgs + PIPE + arg;
+            if ( scala2 ) {
+                arg = PLUGIN_OPTION + pluginArtifacts.stream().map(x -> x.getFile().getAbsolutePath()).collect(Collectors.joining(String.valueOf(java.io.File.pathSeparatorChar)));
+                addScalacArgs = addScalacArgs + PIPE + arg;
+            }
 
             Properties projectProperties = project.getProperties();
 
@@ -358,9 +366,11 @@ else if ( "2.13".equals( resolvedScalaVersion ) || resolvedScalaVersion.startsWi
     // Private utility methods
 
     private static final String SCALA_LIBRARY_GROUP_ID = "org.scala-lang";
-    private static final String SCALA_LIBRARY_ARTIFACT_ID = "scala-library";
+    private static final String SCALA2_LIBRARY_ARTIFACT_ID = "scala-library";
+    private static final String SCALA3_LIBRARY_ARTIFACT_ID = "scala3-library_3";
 
-    private static final String DATA_DIR_OPTION = "-P:scoverage:dataDir:";
+    private static final String SCALA2_DATA_DIR_OPTION = "-P:scoverage:dataDir:";
+    private static final String SCALA3_COVERAGE_OUT_OPTION = "-coverage-out:";
     private static final String SOURCE_ROOT_OPTION = "-P:scoverage:sourceRoot:";
     private static final String EXCLUDED_PACKAGES_OPTION = "-P:scoverage:excludedPackages:";
     private static final String EXCLUDED_FILES_OPTION = "-P:scoverage:excludedFiles:";
@@ -378,15 +388,19 @@ private String quoteArgument( String arg )
     private String resolveScalaVersion()
     {
         String result = scalaVersion;
-        if ( result == null )
+        if ( result == null || result.isEmpty() )
         {
             // check project direct dependencies (transitive dependencies cannot be checked in this Maven lifecycle phase)
             @SuppressWarnings( "unchecked" )
             List<Dependency> dependencies = project.getDependencies();
             for ( Dependency dependency: dependencies )
             {
                 if ( SCALA_LIBRARY_GROUP_ID.equals( dependency.getGroupId() )
-                    && SCALA_LIBRARY_ARTIFACT_ID.equals( dependency.getArtifactId() ) )
+                    && (
+                            SCALA2_LIBRARY_ARTIFACT_ID.equals( dependency.getArtifactId() ) ||
+                            SCALA3_LIBRARY_ARTIFACT_ID.equals( dependency.getArtifactId() )
+                       )
+                )
                 {
                     result = dependency.getVersion();
                     break;
@@ -428,22 +442,25 @@ private ArtifactVersion getScalacPluginVersion() {
         }
     }
 
-    private List<Artifact> getScalaScoveragePluginArtifacts(String resolvedScalaVersion, String scalaMainVersion )
+    private List<Artifact> getScalaScoveragePluginArtifacts( String resolvedScalaVersion, String scalaBinaryVersion, boolean scala2 )
         throws ArtifactNotFoundException, ArtifactResolutionException
     {
         String resolvedScalacPluginVersion = getScalacPluginVersion().toString();
         List<Artifact> resolvedArtifacts = new ArrayList<>();
-        resolvedArtifacts.add(getResolvedArtifact("org.scoverage", "scalac-scoverage-plugin_" + resolvedScalaVersion, resolvedScalacPluginVersion));
-        resolvedArtifacts.add(getResolvedArtifact("org.scoverage", "scalac-scoverage-domain_" + scalaMainVersion, resolvedScalacPluginVersion));
-        resolvedArtifacts.add(getResolvedArtifact("org.scoverage", "scalac-scoverage-serializer_" + scalaMainVersion, resolvedScalacPluginVersion));
+        if ( scala2 ) // Scala 3 doesn't need scalac-scoverage-plugin
+        {
+            resolvedArtifacts.add(getResolvedArtifact("org.scoverage", "scalac-scoverage-plugin_" + resolvedScalaVersion, resolvedScalacPluginVersion));
+        }
+        resolvedArtifacts.add(getResolvedArtifact("org.scoverage", "scalac-scoverage-domain_" + scalaBinaryVersion, resolvedScalacPluginVersion));
+        resolvedArtifacts.add(getResolvedArtifact("org.scoverage", "scalac-scoverage-serializer_" + scalaBinaryVersion, resolvedScalacPluginVersion));
         return resolvedArtifacts;
     }
 
-    private Artifact getScalaScoverageRuntimeArtifact( String scalaMainVersion )
+    private Artifact getScalaScoverageRuntimeArtifact( String scalaBinaryVersion )
         throws ArtifactNotFoundException, ArtifactResolutionException
     {
         return getResolvedArtifact(
-                "org.scoverage", "scalac-scoverage-runtime_" + scalaMainVersion,
+                "org.scoverage", "scalac-scoverage-runtime_" + scalaBinaryVersion,
                 getScalacPluginVersion().toString() );
     }