Cherry-Pick: Support --no-commit

Change-Id: Ic4c313a8971a5aa15745518c49e2587a1a0fe8d4
Signed-off-by: Konrad Kügler <swamblumat-eclipsebugs@yahoo.de>

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

@@ -76,6 +76,18 @@ public class CherryPickCommandTest extends RepositoryTestCase {
 	@Test
 	public void testCherryPick() throws IOException, JGitInternalException,
 			GitAPIException {
+		doTestCherryPick(false);
+	}
+
+	@Test
+	public void testCherryPickNoCommit() throws IOException,
+			JGitInternalException, GitAPIException {
+		doTestCherryPick(true);
+	}
+
+	private void doTestCherryPick(boolean noCommit) throws IOException,
+			JGitInternalException,
+			GitAPIException {
 		Git git = new Git(db);
 
 		writeTrashFile("a", "first line\nsec. line\nthird line\n");
@@ -102,12 +114,15 @@ public class CherryPickCommandTest extends RepositoryTestCase {
 		git.add().addFilepattern("a").call();
 		git.commit().setMessage("enhanced a").call();
 
-		git.cherryPick().include(fixingA).call();
+		CherryPickResult pickResult = git.cherryPick().include(fixingA)
+				.setNoCommit(noCommit).call();
 
+		assertEquals(CherryPickStatus.OK, pickResult.getStatus());
 		assertFalse(new File(db.getWorkTree(), "b").exists());
 		checkFile(new File(db.getWorkTree(), "a"),
 				"first line\nsecond line\nthird line\nfeature++\n");
 		Iterator<RevCommit> history = git.log().call().iterator();
+		if (!noCommit)
 			assertEquals("fixed a", history.next().getFullMessage());
 		assertEquals("enhanced a", history.next().getFullMessage());
 		assertEquals("create a", history.next().getFullMessage());
@@ -205,6 +220,35 @@ public class CherryPickCommandTest extends RepositoryTestCase {
 		assertEquals(RepositoryState.SAFE, db.getRepositoryState());
 	}
 
+	@Test
+	public void testCherryPickConflictResolutionNoCOmmit() throws Exception {
+		Git git = new Git(db);
+		RevCommit sideCommit = prepareCherryPick(git);
+
+		CherryPickResult result = git.cherryPick().include(sideCommit.getId())
+				.setNoCommit(true).call();
+
+		assertEquals(CherryPickStatus.CONFLICTING, result.getStatus());
+		assertTrue(db.readDirCache().hasUnmergedPaths());
+		String expected = "<<<<<<< master\na(master)\n=======\na(side)\n>>>>>>> 527460a side\n";
+		assertEquals(expected, read("a"));
+		assertTrue(new File(db.getDirectory(), Constants.MERGE_MSG).exists());
+		assertEquals("side\n\nConflicts:\n\ta\n", db.readMergeCommitMsg());
+		assertFalse(new File(db.getDirectory(), Constants.CHERRY_PICK_HEAD)
+				.exists());
+		assertEquals(RepositoryState.SAFE, db.getRepositoryState());
+
+		// Resolve
+		writeTrashFile("a", "a");
+		git.add().addFilepattern("a").call();
+
+		assertEquals(RepositoryState.SAFE, db.getRepositoryState());
+
+		git.commit().setOnly("a").setMessage("resolve").call();
+
+		assertEquals(RepositoryState.SAFE, db.getRepositoryState());
+	}
+
 	@Test
 	public void testCherryPickConflictReset() throws Exception {
 		Git git = new Git(db);

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

@@ -93,6 +93,8 @@ public class CherryPickCommand extends GitCommand<CherryPickResult> {
 
 	private Integer mainlineParentNumber;
 
+	private boolean noCommit = false;
+
 	/**
 	 * @param repo
 	 */
@@ -162,6 +164,7 @@ public class CherryPickCommand extends GitCommand<CherryPickResult> {
 							merger.getResultTreeId());
 					dco.setFailOnConflict(true);
 					dco.checkout();
+					if (!noCommit)
 						newHead = new Git(getRepository()).commit()
 								.setMessage(srcCommit.getFullMessage())
 								.setReflogComment(reflogPrefix + " " //$NON-NLS-1$
@@ -178,6 +181,7 @@ public class CherryPickCommand extends GitCommand<CherryPickResult> {
 							.formatWithConflicts(srcCommit.getFullMessage(),
 									merger.getUnmergedPaths());
 
+					if (!noCommit)
 						repo.writeCherryPickHead(srcCommit.getId());
 					repo.writeMergeCommitMsg(message);
 
@@ -303,6 +307,23 @@ public class CherryPickCommand extends GitCommand<CherryPickResult> {
 		return this;
 	}
 
+	/**
+	 * Allows cherry-picking changes without committing them.
+	 * <p>
+	 * NOTE: The behavior of cherry-pick is undefined if you pick multiple
+	 * commits or if HEAD does not match the index state before cherry-picking.
+	 *
+	 * @param noCommit
+	 *            true to cherry-pick without committing, false to commit after
+	 *            each pick (default)
+	 * @return {@code this}
+	 * @since 3.5
+	 */
+	public CherryPickCommand setNoCommit(boolean noCommit) {
+		this.noCommit = noCommit;
+		return this;
+	}
+
 	private String calculateOurName(Ref headRef) {
 		if (ourCommitName != null)
 			return ourCommitName;