Allow custom dependency metadata to be used with the CLI

Add support for a new annotation, @GrabMetadata, that can be used
to provide the coordinates of one or more properties files, such as
the one published by Spring IO Platform, as a source of dependency
metadata. For example:

@GrabMetadata("com.example:metadata:1.0.0")

The referenced properties files must be in the format
group:module=version.

Limitations:

 - Only a single @GrabMetadata annotation is supported
 - The referenced properties file must be accessible in one of the
   default repositories, i.e. it cannot be accessed in a repository
   that's added using @GrabResolver

Closes #814

spring-boot-cli/src/test/java/org/springframework/boot/cli/GrabCommandIntegrationTests.java

@@ -17,6 +17,8 @@
 package org.springframework.boot.cli;
 
 import java.io.File;
+import java.io.FileWriter;
+import java.io.PrintWriter;
 
 import org.junit.After;
 import org.junit.Before;
@@ -26,10 +28,11 @@ import org.springframework.boot.cli.command.grab.GrabCommand;
 import org.springframework.util.FileSystemUtils;
 
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
 
 /**
  * Integration tests for {@link GrabCommand}
- * 
+ *
  * @author Andy Wilkinson
  * @author Dave Syer
  */
@@ -58,4 +61,32 @@ public class GrabCommandIntegrationTests {
 		// Should be resolved from local repository cache
 		assertTrue(output.contains("Downloading: file:"));
 	}
+
+	@Test
+	public void duplicateGrabMetadataAnnotationsProducesAnError() throws Exception {
+		try {
+			this.cli.grab("duplicateGrabMetadata.groovy");
+			fail();
+		}
+		catch (Exception e) {
+			assertTrue(e.getMessage().contains("Duplicate @GrabMetadata annotation"));
+		}
+	}
+
+	@Test
+	public void customMetadata() throws Exception {
+		System.setProperty("grape.root", "target");
+
+		File testArtifactDir = new File("target/repository/test/test/1.0.0");
+		testArtifactDir.mkdirs();
+
+		File testArtifact = new File(testArtifactDir, "test-1.0.0.properties");
+		testArtifact.createNewFile();
+		PrintWriter writer = new PrintWriter(new FileWriter(testArtifact));
+		writer.println("javax.ejb\\:ejb-api=3.0");
+		writer.close();
+
+		this.cli.grab("customGrabMetadata.groovy", "--autoconfigure=false");
+		assertTrue(new File("target/repository/javax/ejb/ejb-api/3.0").isDirectory());
+	}
 }

spring-boot-cli/src/test/java/org/springframework/boot/cli/compiler/ResolveDependencyCoordinatesTransformationTests.java

@@ -50,7 +50,7 @@ import static org.mockito.Mockito.when;
 
 /**
  * Tests for {@link ResolveDependencyCoordinatesTransformation}
- * 
+ *
  * @author Andy Wilkinson
  */
 public final class ResolveDependencyCoordinatesTransformationTests {
@@ -64,9 +64,12 @@ public final class ResolveDependencyCoordinatesTransformationTests {
 
 	private final ArtifactCoordinatesResolver coordinatesResolver = mock(ArtifactCoordinatesResolver.class);
 
-	private final ASTTransformation transformation = new ResolveDependencyCoordinatesTransformation(
+	private final DependencyResolutionContext resolutionContext = new DependencyResolutionContext(
 			this.coordinatesResolver);
 
+	private final ASTTransformation transformation = new ResolveDependencyCoordinatesTransformation(
+			this.resolutionContext);
+
 	@Before
 	public void setupExpectations() {
 		when(this.coordinatesResolver.getGroupId("spring-core")).thenReturn(

spring-boot-cli/src/test/java/org/springframework/boot/cli/compiler/grape/AetherGrapeEngineTests.java

@@ -24,12 +24,13 @@ import java.util.HashMap;
 import java.util.Map;
 
 import org.junit.Test;
+import org.springframework.boot.cli.compiler.DependencyResolutionContext;
 
 import static org.junit.Assert.assertEquals;
 
 /**
  * Tests for {@link AetherGrapeEngine}.
- * 
+ *
  * @author Andy Wilkinson
  */
 public class AetherGrapeEngineTests {
@@ -38,7 +39,8 @@ public class AetherGrapeEngineTests {
 
 	private final AetherGrapeEngine grapeEngine = AetherGrapeEngineFactory.create(
 			this.groovyClassLoader, Arrays.asList(new RepositoryConfiguration("central",
-					URI.create("http://repo1.maven.org/maven2"), false)));
+					URI.create("http://repo1.maven.org/maven2"), false)),
+					new DependencyResolutionContext());
 
 	@Test
 	public void dependencyResolution() {
@@ -47,7 +49,7 @@ public class AetherGrapeEngineTests {
 		this.grapeEngine.grab(args,
 				createDependency("org.springframework", "spring-jdbc", "3.2.4.RELEASE"));
 
-		assertEquals(5, this.groovyClassLoader.getURLs().length);
+		assertEquals(6, this.groovyClassLoader.getURLs().length);
 	}
 
 	@SuppressWarnings("unchecked")
@@ -61,7 +63,7 @@ public class AetherGrapeEngineTests {
 				createDependency("org.springframework", "spring-jdbc", "3.2.4.RELEASE"),
 				createDependency("org.springframework", "spring-beans", "3.2.4.RELEASE"));
 
-		assertEquals(3, this.groovyClassLoader.getURLs().length);
+		assertEquals(4, this.groovyClassLoader.getURLs().length);
 	}
 
 	@Test
@@ -86,7 +88,7 @@ public class AetherGrapeEngineTests {
 				createDependency("org.springframework", "spring-jdbc", "3.2.4.RELEASE"));
 
 		assertEquals(0, this.groovyClassLoader.getURLs().length);
-		assertEquals(5, customClassLoader.getURLs().length);
+		assertEquals(6, customClassLoader.getURLs().length);
 	}
 
 	@Test