[bs-120] Support for groovy templates

* Added GroovyTemplate.template() utility and static import in webapp CLI, so

        @RequestMapping("/")
        @ResponseBody
        String home(Model model) {
           template "home.html", model
        }

    renders the template in /templates/home.html

[Fixes #49832753]

pom.xml

@@ -405,6 +405,11 @@
 				<artifactId>groovy</artifactId>
 				<version>2.1.3</version>
 			</dependency>
+			<dependency>
+				<groupId>org.codehaus.groovy</groupId>
+				<artifactId>groovy-templates</artifactId>
+				<version>2.1.3</version>
+			</dependency>
 			<dependency>
 				<groupId>org.eclipse.jetty</groupId>
 				<artifactId>jetty-webapp</artifactId>

spring-bootstrap-cli/pom.xml

@@ -86,6 +86,11 @@
 			<groupId>org.codehaus.groovy</groupId>
 			<artifactId>groovy</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.codehaus.groovy</groupId>
+			<artifactId>groovy-templates</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>org.apache.ivy</groupId>
 			<artifactId>ivy</artifactId>

spring-bootstrap-cli/samples/template.groovy

@@ -0,0 +1,25 @@
+package org.test
+
+import static org.springframework.bootstrap.cli.template.GroovyTemplate.template;
+
+@Component
+class Example implements CommandLineRunner {
+
+	@Autowired
+	private MyService myService
+
+	void run(String... args) {
+		print template("test.txt", ["message":myService.sayWorld()])
+	}
+}
+
+
+@Service
+class MyService {
+
+	String sayWorld() {
+		return "World"
+	}
+}
+
+

spring-bootstrap-cli/src/main/java/org/springframework/bootstrap/cli/compiler/autoconfigure/SpringMvcCompilerAutoConfiguration.java

@@ -40,6 +40,7 @@ public class SpringMvcCompilerAutoConfiguration extends CompilerAutoConfiguratio
 				"org.eclipse.jetty.server.Server").add("org.eclipse.jetty",
 				"jetty-webapp", "8.1.10.v20130312");
 
+		dependencies.add("org.codehaus.groovy", "groovy-templates", "2.1.3");
 		// FIXME restore Tomcat when we can get reload to work
 		// dependencies.ifMissingClasses("org.apache.catalina.startup.Tomcat",
 		// "org.eclipse.jetty.server.Server")
@@ -56,6 +57,8 @@ public class SpringMvcCompilerAutoConfiguration extends CompilerAutoConfiguratio
 	public void applyImports(ImportCustomizer imports) {
 		imports.addStarImports("org.springframework.web.bind.annotation",
 				"org.springframework.web.servlet.config.annotation");
+		imports.addStaticImport(
+				"org.springframework.bootstrap.cli.template.GroovyTemplate", "template");
 	}
 
 }

spring-bootstrap-cli/src/main/java/org/springframework/bootstrap/cli/template/GroovyTemplate.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2012-2013 the original author or authors.
+ *
+ * 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.springframework.bootstrap.cli.template;
+
+import groovy.text.GStringTemplateEngine;
+import groovy.text.Template;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URL;
+import java.util.Collections;
+import java.util.Map;
+
+import org.codehaus.groovy.control.CompilationFailedException;
+
+/**
+ * @author Dave Syer
+ * 
+ */
+public class GroovyTemplate {
+
+	public static String template(String name) throws IOException,
+			CompilationFailedException, ClassNotFoundException {
+		return template(name, Collections.<String, Object> emptyMap());
+	}
+
+	public static String template(String name, Map<String, ?> model) throws IOException,
+			CompilationFailedException, ClassNotFoundException {
+		GStringTemplateEngine engine = new GStringTemplateEngine();
+		File file = new File("templates", name);
+		URL resource = GroovyTemplate.class.getClassLoader().getResource(
+				"templates/" + name);
+		Template template;
+		if (file.exists()) {
+			template = engine.createTemplate(file);
+		} else {
+			if (resource != null) {
+				template = engine.createTemplate(resource);
+			} else {
+				template = engine.createTemplate(name);
+			}
+		}
+		return template.make(model).toString();
+	}
+
+}

spring-bootstrap-cli/src/test/java/org/springframework/bootstrap/cli/SampleIntegrationTests.java

@@ -92,6 +92,13 @@ public class SampleIntegrationTests {
 		assertTrue("Wrong output: " + output, output.contains("Hello World"));
 	}
 
+	@Test
+	public void templateSample() throws Exception {
+		start("samples/template.groovy");
+		String output = getOutput();
+		assertTrue("Wrong output: " + output, output.contains("Hello World!"));
+	}
+
 	@Test
 	public void jobSample() throws Exception {
 		start("samples/job.groovy", "foo=bar");

spring-bootstrap-cli/src/test/resources/templates/test.txt

@@ -0,0 +1 @@
+Hello ${message}!