Add a command to produce a self-contained executable JAR for a CLI app

A new command, jar, has been added to the CLI. The command can be
used to create a self-contained executable JAR file from a CLI app.

Basic usage is:

spring jar <jar-name> <source-files>

For example:

spring jar my-app.jar *.groovy

The resulting jar will contain the classes generated by compiling the
source files, all of the application's dependencies, and entries
on the application's classpath.

By default a CLI application has the current working directory on
its classpath. This can be overridden using the --classpath option.
Any file that is referenced directly by the classpath is always
included in the jar. Any file that is found a result of being
contained within a directory that is on the classpath is subject to
filtering to determine whether or not it should be included. The
default includes are public/**, static/**, resources/**,
META-INF/**, *. The default excludes are .*, repository/**, build/**,
target/**. To be included in the jar, a file must match one of the
includes and none of the excludes. The filters can be overridden using
the --include and --exclude options.

Closes #241

spring-boot-cli/src/it/java/org/springframework/boot/cli/CommandLineIT.java

@@ -43,7 +43,7 @@ public class CommandLineIT {
 		Invocation cli = this.cli.invoke("hint");
 		assertThat(cli.await(), equalTo(0));
 		assertThat(cli.getErrorOutput().length(), equalTo(0));
-		assertThat(cli.getStandardOutputLines().size(), equalTo(6));
+		assertThat(cli.getStandardOutputLines().size(), equalTo(7));
 	}
 
 	@Test

spring-boot-cli/src/it/java/org/springframework/boot/cli/JarCommandIT.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright 2012-2014 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.boot.cli;
+
+import java.io.File;
+
+import org.junit.Test;
+import org.springframework.boot.cli.infrastructure.CommandLineInvoker;
+import org.springframework.boot.cli.infrastructure.CommandLineInvoker.Invocation;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * @author Andy Wilkinson
+ */
+public class JarCommandIT {
+
+	private final CommandLineInvoker cli = new CommandLineInvoker(new File(
+			"src/it/resources/jar-command"));
+
+	@Test
+	public void noArguments() throws Exception {
+		Invocation invocation = this.cli.invoke("jar");
+		invocation.await();
+		assertEquals(0, invocation.getStandardOutput().length());
+		assertEquals(
+				"The name of the resulting jar and at least one source file must be specified",
+				invocation.getErrorOutput().trim());
+	}
+
+	@Test
+	public void noSources() throws Exception {
+		Invocation invocation = this.cli.invoke("jar", "test-app.jar");
+		invocation.await();
+		assertEquals(0, invocation.getStandardOutput().length());
+		assertEquals(
+				"The name of the resulting jar and at least one source file must be specified",
+				invocation.getErrorOutput().trim());
+	}
+
+	@Test
+	public void jarCreation() throws Exception {
+		File jar = new File("target/test-app.jar");
+		Invocation invocation = this.cli.invoke("jar", jar.getAbsolutePath(),
+				"jar.groovy");
+		invocation.await();
+		assertEquals(0, invocation.getErrorOutput().length());
+		assertTrue(jar.exists());
+
+		ProcessBuilder builder = new ProcessBuilder(System.getProperty("java.home")
+				+ "/bin/java", "-jar", jar.getAbsolutePath());
+		Process process = builder.start();
+		Invocation appInvocation = new Invocation(process);
+		appInvocation.await();
+
+		assertEquals(0, appInvocation.getErrorOutput().length());
+		assertTrue(appInvocation.getStandardOutput().contains("Hello World!"));
+		assertTrue(appInvocation.getStandardOutput().contains("/static/test.txt"));
+	}
+}

spring-boot-cli/src/it/java/org/springframework/boot/cli/infrastructure/CommandLineInvoker.java

@@ -37,6 +37,16 @@ import org.springframework.util.Assert;
  */
 public final class CommandLineInvoker {
 
+	private final File workingDirectory;
+
+	public CommandLineInvoker() {
+		this(new File("."));
+	}
+
+	public CommandLineInvoker(File workingDirectory) {
+		this.workingDirectory = workingDirectory;
+	}
+
 	public Invocation invoke(String... args) throws IOException {
 		return new Invocation(runCliProcess(args));
 	}
@@ -45,7 +55,7 @@ public final class CommandLineInvoker {
 		List<String> command = new ArrayList<String>();
 		command.add(findLaunchScript().getAbsolutePath());
 		command.addAll(Arrays.asList(args));
-		return new ProcessBuilder(command).start();
+		return new ProcessBuilder(command).directory(this.workingDirectory).start();
 	}
 
 	private File findLaunchScript() {
@@ -70,9 +80,9 @@ public final class CommandLineInvoker {
 	}
 
 	/**
-	 * An ongoing CLI invocation.
+	 * An ongoing Process invocation.
 	 */
-	public final class Invocation {
+	public static final class Invocation {
 
 		private final StringBuffer err = new StringBuffer();
 
@@ -80,7 +90,7 @@ public final class CommandLineInvoker {
 
 		private final Process process;
 
-		Invocation(Process process) {
+		public Invocation(Process process) {
 			this.process = process;
 			new Thread(new StreamReadingRunnable(this.process.getErrorStream(), this.err))
 					.start();

spring-boot-cli/src/it/resources/jar-command/jar.groovy

@@ -0,0 +1,21 @@
+package org.test
+
+@Component
+class Example implements CommandLineRunner {
+
+	@Autowired
+	private MyService myService
+
+	void run(String... args) {
+		println "Hello ${this.myService.sayWorld()}"
+		println getClass().getResource('/static/test.txt')
+	}
+}
+
+@Service
+class MyService {
+
+	String sayWorld() {
+		return 'World!'
+	}
+}