Add scala support (#104)

Adds support for adding Smithy source files to Scala project jars.

examples/jar-plugin/scala-project/README.md

@@ -0,0 +1,16 @@
+# Example Project - Scala Project
+
+This is an example Gradle Smithy project. In addition to serving as documentation,
+this project is run as an integration test for the plugin.
+
+This project demonstrates using the Smithy Gradle Plugin with a Scala project. 
+The Jar created by the Scala plugin will include the Smithy models built by the 
+`smithyBuild` task.
+
+## Using the example as a starting point
+
+Since this sample is run as an integration test, by default it is only configured
+to use a locally published version of the plugin. To use this as a starting point
+for your own project, uncomment the lines in `settings.gradle.kts` that configure
+Gradle to use public sources.
+

examples/jar-plugin/scala-project/build.gradle.kts

@@ -0,0 +1,15 @@
+// This project adds smithy models to a JAR created by a Kotlin project
+
+plugins {
+    scala
+    id("software.amazon.smithy.gradle.smithy-jar").version("0.8.0")
+}
+
+dependencies {
+    implementation("org.scala-lang:scala-library:2.13.11")
+}
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}

examples/jar-plugin/scala-project/model/main.smithy

@@ -0,0 +1,5 @@
+namespace smithy.example
+
+structure Baz {
+    foo: String
+}

examples/jar-plugin/scala-project/settings.gradle.kts

@@ -0,0 +1,9 @@
+rootProject.name = "scala-project"
+
+pluginManagement {
+    repositories {
+        mavenLocal()
+        gradlePluginPortal()
+        mavenCentral()
+    }
+}

examples/jar-plugin/scala-project/smithy-build.json

@@ -0,0 +1,6 @@
+{
+  "version": "1.0",
+  "projections": {
+    "foo": {}
+  }
+}

examples/jar-plugin/scala-project/src/main/scala/example/Main.scala

@@ -0,0 +1,9 @@
+package example
+
+object Main {
+    def main(args: Array[String]): Unit = {
+        println(greeting())
+    }
+
+    def greeting(): String = "Hello, world!"
+}

smithy-jar-plugin/src/it/java/software/amazon/smithy/gradle/ScalaProjectTest.java

@@ -0,0 +1,33 @@
+package software.amazon.smithy.gradle;
+
+import org.gradle.testkit.runner.BuildResult;
+import org.gradle.testkit.runner.GradleRunner;
+import org.junit.jupiter.api.Test;
+
+public class ScalaProjectTest {
+    @Test
+    public void testScalaProject() {
+        Utils.withCopy("jar-plugin/scala-project", buildDir -> {
+            BuildResult result = GradleRunner.create()
+                    .forwardOutput()
+                    .withProjectDir(buildDir)
+                    .withArguments("clean", "build", "--stacktrace")
+                    .build();
+
+            Utils.assertSmithyBuildTaskRan(result);
+            Utils.assertValidationRan(result);
+            Utils.assertArtifactsCreated(buildDir,
+                    "build/smithyprojections/scala-project/source/build-info/smithy-build-info.json",
+                    "build/smithyprojections/scala-project/source/model/model.json",
+                    "build/smithyprojections/scala-project/source/sources/main.smithy",
+                    "build/smithyprojections/scala-project/source/sources/manifest",
+                    "build/libs/scala-project.jar");
+            Utils.assertJarContains(buildDir,
+                    "build/libs/scala-project.jar",
+                    "META-INF/smithy/manifest",
+                    "META-INF/smithy/main.smithy",
+                    "example/Main.class"
+            );
+        });
+    }
+}

smithy-jar-plugin/src/main/java/software/amazon/smithy/gradle/SmithyJarPlugin.java

@@ -37,7 +37,8 @@ public class SmithyJarPlugin implements Plugin<Project> {
             "android",
             "android-library",
             "org.jetbrains.kotlin.jvm",
-            "org.jetbrains.kotlin.android"
+            "org.jetbrains.kotlin.android",
+            "scala"
     );
     private boolean wasApplied = false;
     private SmithyExtension extension;

smithy-templates.json

@@ -91,6 +91,16 @@
         ".gitignore"
       ]
     },
+    "scala-project": {
+      "documentation": "Add Smithy models to a jar created by a Scala project.",
+      "path": "examples/jar-plugin/scala-project",
+      "include": [
+        "gradle/",
+        "gradlew",
+        "gradlew.bat",
+        ".gitignore"
+      ]
+    },
     "multiple-jars": {
       "documentation": "Build a Smithy JAR using both the java-library plugin and manually defined tasks.",
       "path": "examples/jar-plugin/multiple-jars",