[bs-135] Plugin model for spring commands

* Added CommandFactory and a ServiceLoader model for providing
implementations
* Added ScriptCommand (wrapping groovy script). Service providers
are recommended to implement OptionHandler in their script, but a
regulare Script or a Runnable will also work.

[#50427095]

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

@@ -28,6 +28,7 @@ import org.junit.After;
 import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.Test;
+import org.springframework.bootstrap.cli.command.RunCommand;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;

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

@@ -11,6 +11,8 @@ import org.junit.Test;
 import org.junit.rules.ExpectedException;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
+import org.springframework.bootstrap.cli.SpringBootstrapCli.NoArgumentsException;
+import org.springframework.bootstrap.cli.SpringBootstrapCli.NoHelpCommandArgumentsException;
 
 import static org.hamcrest.Matchers.equalTo;
 import static org.junit.Assert.assertThat;

spring-bootstrap-cli/src/test/java/org/springframework/bootstrap/cli/command/ScriptCommandTests.java

@@ -0,0 +1,54 @@
+/*
+ * 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.command;
+
+import groovy.lang.Script;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * @author Dave Syer
+ * 
+ */
+public class ScriptCommandTests {
+
+	public static boolean executed = false;
+
+	@Test
+	public void testScript() throws Exception {
+		ScriptCommand command = new ScriptCommand("script", "Run a test command");
+		command.run("World");
+		assertEquals("World",
+				((String[]) ((Script) command.getMain()).getProperty("args"))[0]);
+	}
+
+	@Test
+	public void testOptions() throws Exception {
+		ScriptCommand command = new ScriptCommand("test", "Run a test command");
+		command.run("World", "--foo");
+		ByteArrayOutputStream out = new ByteArrayOutputStream();
+		((OptionHandler) command.getMain()).printHelp(new PrintStream(out));
+		assertTrue("Wrong output: " + out, out.toString().contains("--foo"));
+		assertTrue(executed);
+	}
+
+}

spring-bootstrap-cli/src/test/resources/commands/script.groovy

@@ -0,0 +1 @@
+println "Hello ${args[0]}"

spring-bootstrap-cli/src/test/resources/commands/test.groovy

@@ -0,0 +1,19 @@
+package org.test.command
+
+@Grab("org.eclipse.jgit:org.eclipse.jgit:2.3.1.201302201838-r")
+import org.eclipse.jgit.api.Git
+
+class TestCommand extends OptionHandler {
+
+	void options() {
+		option "foo", "Foo set"
+	}
+
+	void run(OptionSet options) {
+		// Demonstrate use of Grape.grab to load dependencies before running
+		println "Clean : " + Git.open(".." as File).status().call().isClean()
+		org.springframework.bootstrap.cli.command.ScriptCommandTests.executed = true
+		println "Hello ${options.nonOptionArguments()}: ${options.has('foo')}"
+	}
+
+}