ApplyCommand: fix "no newline at end" detection

Check the last line of the last hunk of a file, not the last line of
the whole patch.

Note that C git only checks that this line starts with "\ " and is at
least 12 characters long because of possible different texts when non-
English messages are used.

Change-Id: I0db81699eb3e99ed7b536a3e2b8dc97df1f58a89
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>

org.eclipse.jgit.test/tst-rsrc/org/eclipse/jgit/diff/hello.patch

@@ -0,0 +1,16 @@
+diff --git a/hello b/hello
+index b6fc4c6..0abaeaa 100644
+--- a/hello
++++ b/hello
+@@ -1 +1 @@
+-hello
+\ No newline at end of file
++bye
+\ No newline at end of file
+diff --git a/yello b/yello
+index 391a8cb..d1ed081 100644
+--- a/yello
++++ b/yello
+@@ -1 +1 @@
+-yello
++yellow

org.eclipse.jgit.test/tst-rsrc/org/eclipse/jgit/diff/hello_PostImage

@@ -0,0 +1 @@
+bye

org.eclipse.jgit.test/tst-rsrc/org/eclipse/jgit/diff/hello_PreImage

@@ -0,0 +1 @@
+hello

org.eclipse.jgit.test/tst/org/eclipse/jgit/api/ApplyCommandTest.java

@@ -20,6 +20,7 @@ import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 
 import org.eclipse.jgit.api.errors.PatchApplyException;
@@ -251,6 +252,11 @@ public class ApplyCommandTest extends RepositoryTestCase {
 
 	private void checkBinary(String name, boolean hasPreImage)
 			throws Exception {
+		checkBinary(name, hasPreImage, 1);
+	}
+
+	private void checkBinary(String name, boolean hasPreImage,
+			int numberOfFiles) throws Exception {
 		try (Git git = new Git(db)) {
 			byte[] post = IO
 					.readWholeStream(getTestResource(name + "_PostImage"), 0)
@@ -266,7 +272,7 @@ public class ApplyCommandTest extends RepositoryTestCase {
 			}
 			ApplyResult result = git.apply()
 					.setPatch(getTestResource(name + ".patch")).call();
-			assertEquals(1, result.getUpdatedFiles().size());
+			assertEquals(numberOfFiles, result.getUpdatedFiles().size());
 			assertEquals(f, result.getUpdatedFiles().get(0));
 			assertArrayEquals(post, Files.readAllBytes(f.toPath()));
 		}
@@ -303,6 +309,18 @@ public class ApplyCommandTest extends RepositoryTestCase {
 		checkBinary("emptyLine", true);
 	}
 
+	@Test
+	public void testMultiFileNoNewline() throws Exception {
+		// This test needs two files. One is in the test resources.
+		try (Git git = new Git(db)) {
+			Files.write(db.getWorkTree().toPath().resolve("yello"),
+					"yello".getBytes(StandardCharsets.US_ASCII));
+			git.add().addFilepattern("yello").call();
+			git.commit().setMessage("yello").call();
+		}
+		checkBinary("hello", true, 2);
+	}
+
 	@Test
 	public void testAddA1() throws Exception {
 		ApplyResult result = init("A1", false, true);

org.eclipse.jgit/src/org/eclipse/jgit/api/ApplyCommand.java

@@ -742,7 +742,11 @@ public class ApplyCommand extends GitCommand<ApplyResult> {
 			return false;
 		}
 		HunkHeader lastHunk = hunks.get(hunks.size() - 1);
-		RawText lhrt = new RawText(lastHunk.getBuffer());
+		byte[] buf = new byte[lastHunk.getEndOffset()
+				- lastHunk.getStartOffset()];
+		System.arraycopy(lastHunk.getBuffer(), lastHunk.getStartOffset(), buf,
+				0, buf.length);
+		RawText lhrt = new RawText(buf);
 		return lhrt.getString(lhrt.size() - 1)
 				.equals("\\ No newline at end of file"); //$NON-NLS-1$
 	}