Add -o option to commit command

This change adds the --only/ -o option to the commit command.

Change-Id: I44352d56877f8204d985cb7a35a2e0faffb7d341
Signed-off-by: Philipp Thun <philipp.thun@sap.com>

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

@@ -62,8 +62,9 @@ metaVar_base=base
 metaVar_bucket=BUCKET
 metaVar_command=command
 metaVar_commandDetail=DETAIL
-metaVar_commitOrTag=COMMIT|TAG
 metaVar_commitish=commit-ish
+metaVar_commitOrTag=COMMIT|TAG
+metaVar_commitPaths=paths
 metaVar_configFile=FILE
 metaVar_connProp=conn.prop
 metaVar_diffAlg=ALGORITHM
@@ -113,6 +114,7 @@ notFound=!! NOT FOUND !!
 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
 remoteMessage=remote: {0}
 remoteRefObjectChangedIsNotExpectedOne=remote ref object changed - is not expected one {0}
 remoteSideDoesNotSupportDeletingRefs=remote side does not support deleting refs
@@ -125,6 +127,8 @@ 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.
 usage_CommitMessage=Use the given <msg> as the commit message
+usage_CommitOnly=commit specified paths only
+usage_CommitPaths=see --only
 usage_CreateABareRepository=Create a bare repository
 usage_CreateATag=Create a tag
 usage_CreateAnEmptyGitRepository=Create an empty git repository

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

@@ -133,6 +133,7 @@ public class CLIText extends TranslationBundle {
 	/***/ public String noteObjectTooLargeToPrint;
 	/***/ public String onlyOneMetaVarExpectedIn;
 	/***/ public String pushTo;
+	/***/ public String pathsRequired;
 	/***/ public String remoteMessage;
 	/***/ public String remoteRefObjectChangedIsNotExpectedOne;
 	/***/ public String remoteSideDoesNotSupportDeletingRefs;

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

@@ -37,6 +37,9 @@
  */
 package org.eclipse.jgit.pgm;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import org.eclipse.jgit.api.CommitCommand;
 import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.api.errors.ConcurrentRefUpdateException;
@@ -47,6 +50,7 @@ import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.util.RawParseUtils;
+import org.kohsuke.args4j.Argument;
 import org.kohsuke.args4j.Option;
 
 @Command(common = true, usage = "usage_recordChangesToRepository")
@@ -54,12 +58,18 @@ class Commit extends TextBuiltin {
 	// I don't support setting the committer, because also the native git
 	// command doesn't allow this.
 
-	@Option(name = "--author", metaVar="metaVar_author", usage = "usage_CommitAuthor")
+	@Option(name = "--author", metaVar = "metaVar_author", usage = "usage_CommitAuthor")
 	private String author;
 
-	@Option(name = "--message", aliases = { "-m" }, metaVar="metaVar_message", usage="usage_CommitMessage", required=true)
+	@Option(name = "--message", aliases = { "-m" }, metaVar = "metaVar_message", usage = "usage_CommitMessage", required = true)
 	private String message;
 
+	@Option(name = "--only", aliases = { "-o" }, usage = "usage_CommitOnly")
+	private boolean only;
+
+	@Argument(metaVar = "metaVar_commitPaths", usage = "usage_CommitPaths")
+	private List<String> paths = new ArrayList<String>();
+
 	@Override
 	protected void run() throws NoHeadException, NoMessageException,
 			ConcurrentRefUpdateException, JGitInternalException, Exception {
@@ -68,6 +78,11 @@ class Commit extends TextBuiltin {
 			commitCmd.setAuthor(RawParseUtils.parsePersonIdent(author));
 		if (message != null)
 			commitCmd.setMessage(message);
+		if (only && paths.isEmpty())
+			throw die(CLIText.get().pathsRequired);
+		if (!paths.isEmpty())
+			for (String p : paths)
+				commitCmd.setOnly(p);
 		Ref head = db.getRef(Constants.HEAD);
 		RevCommit commit = commitCmd.call();
 

org.eclipse.jgit/resources/org/eclipse/jgit/JGitText.properties

@@ -153,6 +153,7 @@ duplicateRef=Duplicate ref: {0}
 duplicateRemoteRefUpdateIsIllegal=Duplicate remote ref update is illegal. Affected remote name: {0}
 duplicateStagesNotAllowed=Duplicate stages not allowed
 eitherGitDirOrWorkTreeRequired=One of setGitDir or setWorkTree must be called.
+emptyCommit=No changes
 emptyPathNotPermitted=Empty path not permitted.
 encryptionError=Encryption error: {0}
 endOfFileInEscape=End of file in escape
@@ -207,6 +208,7 @@ hunkBelongsToAnotherFile=Hunk belongs to another file
 hunkDisconnectedFromFile=Hunk disconnected from file
 hunkHeaderDoesNotMatchBodyLineCountOf=Hunk header {0} does not match body line count of {1}
 illegalArgumentNotA=Not {0}
+illegalCombinationOfArguments=The combination of arguments {0} and {1} is not allowed
 illegalStateExists=exists {0}
 improperlyPaddedBase64Input=Improperly padded Base64 input.
 inMemoryBufferLimitExceeded=In-memory buffer limit exceeded

org.eclipse.jgit/src/org/eclipse/jgit/JGitText.java

@@ -213,6 +213,7 @@ public class JGitText extends TranslationBundle {
 	/***/ public String duplicateRemoteRefUpdateIsIllegal;
 	/***/ public String duplicateStagesNotAllowed;
 	/***/ public String eitherGitDirOrWorkTreeRequired;
+	/***/ public String emptyCommit;
 	/***/ public String emptyPathNotPermitted;
 	/***/ public String encryptionError;
 	/***/ public String endOfFileInEscape;
@@ -267,6 +268,7 @@ public class JGitText extends TranslationBundle {
 	/***/ public String hunkDisconnectedFromFile;
 	/***/ public String hunkHeaderDoesNotMatchBodyLineCountOf;
 	/***/ public String illegalArgumentNotA;
+	/***/ public String illegalCombinationOfArguments;
 	/***/ public String illegalStateExists;
 	/***/ public String improperlyPaddedBase64Input;
 	/***/ public String inMemoryBufferLimitExceeded;

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

@@ -43,7 +43,9 @@
 package org.eclipse.jgit.api;
 
 import java.io.IOException;
+import java.io.InputStream;
 import java.text.MessageFormat;
+import java.util.ArrayList;
 import java.util.LinkedList;
 import java.util.List;
 
@@ -55,6 +57,12 @@ import org.eclipse.jgit.api.errors.NoHeadException;
 import org.eclipse.jgit.api.errors.NoMessageException;
 import org.eclipse.jgit.api.errors.WrongRepositoryStateException;
 import org.eclipse.jgit.dircache.DirCache;
+import org.eclipse.jgit.dircache.DirCacheBuilder;
+import org.eclipse.jgit.dircache.DirCacheEditor;
+import org.eclipse.jgit.dircache.DirCacheEditor.DeletePath;
+import org.eclipse.jgit.dircache.DirCacheEditor.PathEdit;
+import org.eclipse.jgit.dircache.DirCacheEntry;
+import org.eclipse.jgit.dircache.DirCacheIterator;
 import org.eclipse.jgit.errors.UnmergedPathException;
 import org.eclipse.jgit.lib.CommitBuilder;
 import org.eclipse.jgit.lib.Constants;
@@ -68,6 +76,9 @@ import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.lib.RepositoryState;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
+import org.eclipse.jgit.treewalk.CanonicalTreeParser;
+import org.eclipse.jgit.treewalk.FileTreeIterator;
+import org.eclipse.jgit.treewalk.TreeWalk;
 
 /**
  * A class used to execute a {@code Commit} command. It has setters for all
@@ -87,6 +98,10 @@ public class CommitCommand extends GitCommand<RevCommit> {
 
 	private boolean all;
 
+	private List<String> only = new ArrayList<String>();
+
+	private boolean[] onlyProcessed;
+
 	private boolean amend;
 
 	/**
@@ -170,6 +185,9 @@ public class CommitCommand extends GitCommand<RevCommit> {
 			// lock the index
 			DirCache index = repo.lockDirCache();
 			try {
+				if (!only.isEmpty())
+					index = createTemporaryIndex(headId, index);
+
 				ObjectInserter odi = repo.newObjectInserter();
 				try {
 					// Write the index as tree to the object database. This may
@@ -241,6 +259,165 @@ public class CommitCommand extends GitCommand<RevCommit> {
 		}
 	}
 
+	private DirCache createTemporaryIndex(ObjectId headId, DirCache index)
+			throws IOException {
+		ObjectInserter inserter = null;
+
+		// get DirCacheEditor to modify the index if required
+		DirCacheEditor dcEditor = index.editor();
+
+		// get DirCacheBuilder for newly created in-core index to build a
+		// temporary index for this commit
+		DirCache inCoreIndex = DirCache.newInCore();
+		DirCacheBuilder dcBuilder = inCoreIndex.builder();
+
+		onlyProcessed = new boolean[only.size()];
+		boolean emptyCommit = true;
+
+		TreeWalk treeWalk = new TreeWalk(repo);
+		int dcIdx = treeWalk.addTree(new DirCacheIterator(index));
+		int fIdx = treeWalk.addTree(new FileTreeIterator(repo));
+		int hIdx = -1;
+		if (headId != null)
+			hIdx = treeWalk.addTree(new RevWalk(repo).parseTree(headId));
+		treeWalk.setRecursive(true);
+
+		while (treeWalk.next()) {
+			String path = treeWalk.getPathString();
+			// check if current entry's path matches a specified path
+			int pos = lookupOnly(path);
+
+			CanonicalTreeParser hTree = null;
+			if (hIdx != -1)
+				hTree = treeWalk.getTree(hIdx, CanonicalTreeParser.class);
+
+			if (pos >= 0) {
+				// include entry in commit
+
+				DirCacheIterator dcTree = treeWalk.getTree(dcIdx,
+						DirCacheIterator.class);
+				FileTreeIterator fTree = treeWalk.getTree(fIdx,
+						FileTreeIterator.class);
+
+				// check if entry refers to a tracked file
+				boolean tracked = dcTree != null || hTree != null;
+				if (!tracked)
+					break;
+
+				if (fTree != null) {
+					// create a new DirCacheEntry with data retrieved from disk
+					final DirCacheEntry dcEntry = new DirCacheEntry(path);
+					long entryLength = fTree.getEntryLength();
+					dcEntry.setLength(entryLength);
+					dcEntry.setLastModified(fTree.getEntryLastModified());
+					dcEntry.setFileMode(fTree.getEntryFileMode());
+
+					boolean objectExists = (dcTree != null && fTree
+							.idEqual(dcTree))
+							|| (hTree != null && fTree.idEqual(hTree));
+					if (objectExists) {
+						dcEntry.setObjectId(fTree.getEntryObjectId());
+					} else {
+						// insert object
+						if (inserter == null)
+							inserter = repo.newObjectInserter();
+
+						InputStream inputStream = fTree.openEntryStream();
+						try {
+							dcEntry.setObjectId(inserter.insert(
+									Constants.OBJ_BLOB, entryLength,
+									inputStream));
+						} finally {
+							inputStream.close();
+						}
+					}
+
+					// update index
+					dcEditor.add(new PathEdit(path) {
+						@Override
+						public void apply(DirCacheEntry ent) {
+							ent.copyMetaData(dcEntry);
+						}
+					});
+					// add to temporary in-core index
+					dcBuilder.add(dcEntry);
+
+					if (emptyCommit && (hTree == null || !hTree.idEqual(fTree)))
+						// this is a change
+						emptyCommit = false;
+				} else {
+					// if no file exists on disk, remove entry from index and
+					// don't add it to temporary in-core index
+					dcEditor.add(new DeletePath(path));
+
+					if (emptyCommit && hTree != null)
+						// this is a change
+						emptyCommit = false;
+				}
+
+				// keep track of processed path
+				onlyProcessed[pos] = true;
+			} else {
+				// add entries from HEAD for all other paths
+				if (hTree != null) {
+					// create a new DirCacheEntry with data retrieved from HEAD
+					final DirCacheEntry dcEntry = new DirCacheEntry(path);
+					dcEntry.setObjectId(hTree.getEntryObjectId());
+					dcEntry.setFileMode(hTree.getEntryFileMode());
+
+					// add to temporary in-core index
+					dcBuilder.add(dcEntry);
+				}
+			}
+		}
+
+		// there must be no unprocessed paths left at this point; otherwise an
+		// untracked or unknown path has been specified
+		for (int i = 0; i < onlyProcessed.length; i++)
+			if (!onlyProcessed[i])
+				throw new JGitInternalException(MessageFormat.format(
+						JGitText.get().entryNotFoundByPath, only.get(i)));
+
+		// there must be at least one change
+		if (emptyCommit)
+			throw new JGitInternalException(JGitText.get().emptyCommit);
+
+		// update index
+		dcEditor.commit();
+		// finish temporary in-core index used for this commit
+		dcBuilder.finish();
+		return inCoreIndex;
+	}
+
+	/**
+	 * Look an entry's path up in the list of paths specified by the --only/ -o
+	 * option
+	 *
+	 * In case the complete (file) path (e.g. "d1/d2/f1") cannot be found in
+	 * <code>only</code>, lookup is also tried with (parent) directory paths
+	 * (e.g. "d1/d2" and "d1").
+	 *
+	 * @param pathString
+	 *            entry's path
+	 * @return the item's index in <code>only</code>; -1 if no item matches
+	 */
+	private int lookupOnly(String pathString) {
+		int i = 0;
+		for (String o : only) {
+			String p = pathString;
+			while (true) {
+				if (p.equals(o))
+					return i;
+				int l = p.lastIndexOf("/");
+				if (l < 1)
+					break;
+				p = p.substring(0, l);
+			}
+			i++;
+		}
+		return -1;
+	}
+
 	/**
 	 * Sets default values for not explicitly specified options. Then validates
 	 * that all required data has been provided.
@@ -386,14 +563,20 @@ public class CommitCommand extends GitCommand<RevCommit> {
 
 	/**
 	 * If set to true the Commit command automatically stages files that have
-	 * been modified and deleted, but new files you not known by the repository
-	 * are not affected. This corresponds to the parameter -a on the command
-	 * line.
+	 * been modified and deleted, but new files not known by the repository are
+	 * not affected. This corresponds to the parameter -a on the command line.
 	 *
 	 * @param all
 	 * @return {@code this}
+	 * @throws JGitInternalException
+	 *             in case of an illegal combination of arguments/ options
 	 */
 	public CommitCommand setAll(boolean all) {
+		checkCallable();
+		if (!only.isEmpty())
+			throw new JGitInternalException(MessageFormat.format(
+					JGitText.get().illegalCombinationOfArguments, "--all",
+					"--only"));
 		this.all = all;
 		return this;
 	}
@@ -407,8 +590,33 @@ public class CommitCommand extends GitCommand<RevCommit> {
 	 * @return {@code this}
 	 */
 	public CommitCommand setAmend(boolean amend) {
+		checkCallable();
 		this.amend = amend;
 		return this;
 	}
 
+	/**
+	 * Commit dedicated path only
+	 *
+	 * This method can be called several times to add multiple paths. Full file
+	 * paths are supported as well as directory paths; in the latter case this
+	 * commits all files/ directories below the specified path.
+	 *
+	 * @param only
+	 *            path to commit
+	 * @return {@code this}
+	 */
+	public CommitCommand setOnly(String only) {
+		checkCallable();
+		if (all)
+			throw new JGitInternalException(MessageFormat.format(
+					JGitText.get().illegalCombinationOfArguments, "--only",
+					"--all"));
+		String o = only.endsWith("/") ? only.substring(0, only.length() - 1)
+				: only;
+		// ignore duplicates
+		if (!this.only.contains(o))
+			this.only.add(o);
+		return this;
+	}
 }