Added Merge command to the CLI

This merge command accepts the merge strategy as option and uses the
resolve strategy as default. It expects exactly one other
revision which is merged with current head.

Change-Id: Ia8c188b93ade4afabe6a9ccf267faf045f359a3a
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>

org.eclipse.jgit.pgm/META-INF/MANIFEST.MF

@@ -14,6 +14,7 @@ Import-Package: org.eclipse.jgit.api;version="[0.12.0,0.13.0)",
  org.eclipse.jgit.errors;version="[0.12.0,0.13.0)",
  org.eclipse.jgit.iplog;version="[0.12.0,0.13.0)",
  org.eclipse.jgit.lib;version="[0.12.0,0.13.0)",
+ org.eclipse.jgit.merge;version="0.12.0",
  org.eclipse.jgit.nls;version="[0.12.0,0.13.0)",
  org.eclipse.jgit.notes;version="[0.12.0,0.13.0)",
  org.eclipse.jgit.revplot;version="[0.12.0,0.13.0)",

org.eclipse.jgit.pgm/META-INF/services/org.eclipse.jgit.pgm.TextBuiltin

@@ -14,6 +14,7 @@ org.eclipse.jgit.pgm.Init
 org.eclipse.jgit.pgm.Log
 org.eclipse.jgit.pgm.LsRemote
 org.eclipse.jgit.pgm.LsTree
+org.eclipse.jgit.pgm.Merge
 org.eclipse.jgit.pgm.MergeBase
 org.eclipse.jgit.pgm.Push
 org.eclipse.jgit.pgm.ReceivePack

org.eclipse.jgit.pgm/resources/org/eclipse/jgit/pgm/CLIText.properties

@@ -19,9 +19,11 @@ cannotChekoutNoHeadsAdvertisedByRemote=cannot checkout; no HEAD advertised by re
 cannotCreateCommand=Cannot create command {0}
 cannotCreateOutputStream=cannot create output stream
 cannotDeatchHEAD=Cannot deatch HEAD
+cannotDeleteFile=error: The following file could not be deleted:
 cannotDeleteTheBranchWhichYouAreCurrentlyOn=Cannot delete the branch '{0}' which you are currently on.
 cannotGuessLocalNameFrom=cannot guess local name from {0}
 cannotLock=Cannot lock {0}
+cannotMergeDetachedHead=Cannot merge into detached HEAD
 cannotReadBecause=cannot read {0}: {1}
 cannotReadPackageInformation=Cannot read package information.
 cannotRenameDetachedHEAD=Cannot rename detached HEAD
@@ -39,6 +41,7 @@ dateInfo=Date:   {0}
 deletedBranch=Deleted branch {0}
 deletedRemoteBranch=Deleted remote branch {0}
 doesNotExist={0} does not exist
+dontOverwriteLocalChanges=error: Your local changes to the following file would be overwritten by merge:
 everythingUpToDate=Everything up-to-date
 expectedNumberOfbytes=Expected {0} bytes.
 exporting=Exporting {0}
@@ -54,6 +57,9 @@ initializedEmptyGitRepositoryIn=Initialized empty Git repository in {0}
 invalidHttpProxyOnlyHttpSupported=Invalid http_proxy: {0}: Only http supported.
 jgitVersion=jgit version {0}
 listeningOn=Listening on {0}
+mergeConflict=CONFLICT(content): Merge conflict in {0}
+mergeFailed=Automatic merge failed; fix conflicts and then commit the result
+mergeMadeBy=Merge made by {0}
 metaVar_DAG=DAG
 metaVar_KEY=KEY
 metaVar_arg=ARG
@@ -115,6 +121,7 @@ noteObjectTooLargeToPrint=Note object {0} too large to print
 onlyOneMetaVarExpectedIn=Only one {0} expected in {1}.
 pushTo=To {0}
 pathsRequired=at least one path has to be specified when using --only
+refDoesNotExistOrNoCommit={0} does not exist or is not referring to a commit
 remoteMessage=remote: {0}
 remoteRefObjectChangedIsNotExpectedOne=remote ref object changed - is not expected one {0}
 remoteSideDoesNotSupportDeletingRefs=remote side does not support deleting refs
@@ -123,6 +130,7 @@ serviceNotSupported=Service '{0}' not supported
 skippingObject=skipping {0} {1}
 timeInMilliSeconds={0} ms
 tooManyRefsGiven=Too many refs given
+unknownMergeStratey=unknown merge strategy {0} specified
 unsupportedOperation=Unsupported operation: {0}
 usage_CommandLineClientForamazonsS3Service=Command line client for Amazon's S3 service
 usage_CommitAuthor=Override the author name used in the commit. You can use the standard A U Thor <author@example.com> format.
@@ -136,6 +144,7 @@ usage_DisplayTheVersionOfJgit=Display the version of jgit
 usage_IPZillaPassword=IPZilla Password
 usage_IPZillaURL=IPZilla URL
 usage_IPZillausername=IPZilla Username
+usage_MergesTwoDevelopmentHistories=Merges two developement histories
 usage_RepositoryToReadFrom=Repository to read from
 usage_RepositoryToReceiveInto=Repository to receive into
 usage_ServerSideBackendForJgitFetch=Server side backend for 'jgit fetch'
@@ -183,6 +192,7 @@ usage_inputOutputFile=Input/output file
 usage_listBothRemoteTrackingAndLocalBranches=list both remote-tracking and local branches
 usage_listCreateOrDeleteBranches=List, create, or delete branches
 usage_logAllPretty=format:%H %ct %P' output=log --all '--pretty=format:%H %ct %P' output
+usage_mergeStrategy=Use the given merge strategy. Can be supplied more than once to specify them in the order they should be tried. If there is no -s option, the resolve strategy is used. Currently the following strategies are supported: ours, theirs, simple-two-way-in-core, resolve
 usage_moveRenameABranch=move/rename a branch
 usage_nameStatus=show only name and status of files
 usage_noPrefix=do not show any source or destination prefix

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/CLIText.java

@@ -73,9 +73,11 @@ public class CLIText extends TranslationBundle {
 	/***/ public String cannotCreateCommand;
 	/***/ public String cannotCreateOutputStream;
 	/***/ public String cannotDeatchHEAD;
+	/***/ public String cannotDeleteFile;
 	/***/ public String cannotDeleteTheBranchWhichYouAreCurrentlyOn;
 	/***/ public String cannotGuessLocalNameFrom;
 	/***/ public String cannotLock;
+	/***/ public String cannotMergeDetachedHead;
 	/***/ public String cannotReadBecause;
 	/***/ public String cannotReadPackageInformation;
 	/***/ public String cannotRenameDetachedHEAD;
@@ -92,6 +94,7 @@ public class CLIText extends TranslationBundle {
 	/***/ public String deletedBranch;
 	/***/ public String deletedRemoteBranch;
 	/***/ public String doesNotExist;
+	/***/ public String dontOverwriteLocalChanges;
 	/***/ public String everythingUpToDate;
 	/***/ public String expectedNumberOfbytes;
 	/***/ public String exporting;
@@ -107,6 +110,9 @@ public class CLIText extends TranslationBundle {
 	/***/ public String invalidHttpProxyOnlyHttpSupported;
 	/***/ public String jgitVersion;
 	/***/ public String listeningOn;
+	/***/ public String mergeConflict;
+	/***/ public String mergeFailed;
+	/***/ public String mergeMadeBy;
 	/***/ public String metaVar_command;
 	/***/ public String metaVar_commitish;
 	/***/ public String metaVar_object;
@@ -134,6 +140,7 @@ public class CLIText extends TranslationBundle {
 	/***/ public String onlyOneMetaVarExpectedIn;
 	/***/ public String pushTo;
 	/***/ public String pathsRequired;
+	/***/ public String refDoesNotExistOrNoCommit;
 	/***/ public String remoteMessage;
 	/***/ public String remoteRefObjectChangedIsNotExpectedOne;
 	/***/ public String remoteSideDoesNotSupportDeletingRefs;
@@ -142,6 +149,7 @@ public class CLIText extends TranslationBundle {
 	/***/ public String skippingObject;
 	/***/ public String timeInMilliSeconds;
 	/***/ public String tooManyRefsGiven;
+	/***/ public String unknownMergeStratey;
 	/***/ public String unsupportedOperation;
 	/***/ public String warningNoCommitGivenOnCommandLine;
 }

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Merge.java

@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2011, Christian Halstrick <christian.halstrick@sap.com>
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.eclipse.jgit.pgm;
+
+import java.text.MessageFormat;
+import java.util.Map;
+
+import org.eclipse.jgit.api.Git;
+import org.eclipse.jgit.api.MergeResult;
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.merge.MergeStrategy;
+import org.eclipse.jgit.merge.ResolveMerger.MergeFailureReason;
+import org.kohsuke.args4j.Argument;
+import org.kohsuke.args4j.Option;
+
+@Command(common = true, usage = "usage_MergesTwoDevelopmentHistories")
+class Merge extends TextBuiltin {
+
+	@Option(name = "--strategy", aliases = { "-s" }, usage = "usage_mergeStrategy")
+	private String strategyName;
+
+	private MergeStrategy mergeStrategy = MergeStrategy.RESOLVE;
+
+	@Argument(required = true)
+	private String ref;
+
+	@Override
+	protected void run() throws Exception {
+		// determine the merge strategy
+		if (strategyName != null) {
+			mergeStrategy = MergeStrategy.get(strategyName);
+			if (mergeStrategy == null)
+				throw die(MessageFormat.format(
+						CLIText.get().unknownMergeStratey, strategyName));
+		}
+
+		// determine the other revision we want to merge with HEAD
+		final ObjectId src = db.resolve(ref + "^{commit}");
+		if (src == null)
+			throw die(MessageFormat.format(
+					CLIText.get().refDoesNotExistOrNoCommit, ref));
+
+		Git git = new Git(db);
+		MergeResult result = git.merge().setStrategy(mergeStrategy)
+				.include(src).call();
+
+		switch (result.getMergeStatus()) {
+		case ALREADY_UP_TO_DATE:
+		case FAST_FORWARD:
+			out.println(result.getMergeStatus().toString());
+			break;
+		case CONFLICTING:
+			for (String collidingPath : result.getConflicts().keySet())
+				out.println(MessageFormat.format(CLIText.get().mergeConflict,
+						collidingPath));
+			out.println(CLIText.get().mergeFailed);
+			break;
+		case FAILED:
+			for (Map.Entry<String, MergeFailureReason> entry : result
+					.getFailingPaths().entrySet())
+				switch (entry.getValue()) {
+				case DIRTY_WORKTREE:
+				case DIRTY_INDEX:
+					out.println(CLIText.get().dontOverwriteLocalChanges);
+					out.println("        " + entry.getKey());
+					break;
+				case COULD_NOT_DELETE:
+					out.println(CLIText.get().cannotDeleteFile);
+					out.println("        " + entry.getKey());
+					break;
+				}
+			break;
+		case MERGED:
+			out.println(MessageFormat.format(CLIText.get().mergeMadeBy,
+					mergeStrategy.getName()));
+		case NOT_SUPPORTED:
+			out.println(MessageFormat.format(
+					CLIText.get().unsupportedOperation, result.toString()));
+		}
+	}
+}