Update Tag to use TagCommand API

Change-Id: I4f7f8e29c47980536398d73f2a71ed2b2c00f4f2
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>

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

@@ -1,6 +1,7 @@
 /*
- * Copyright (C) 2008, Charles O'Farrell <charleso@charleso.org>
+ * Copyright (C) 2010, Chris Aniszczyk <caniszczyk@gmail.com>
  * Copyright (C) 2009, Google Inc.
+ * Copyright (C) 2008, Charles O'Farrell <charleso@charleso.org>
  * Copyright (C) 2008, Robin Rosenberg <robin.rosenberg.lists@dewire.com>
  * Copyright (C) 2008, Robin Rosenberg <robin.rosenberg@dewire.com>
  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
@@ -47,14 +48,10 @@
 
 package org.eclipse.jgit.pgm;
 
-import java.text.MessageFormat;
-
-import org.eclipse.jgit.lib.Constants;
+import org.eclipse.jgit.api.Git;
+import org.eclipse.jgit.api.TagCommand;
 import org.eclipse.jgit.lib.ObjectId;
-import org.eclipse.jgit.lib.ObjectInserter;
-import org.eclipse.jgit.lib.ObjectLoader;
-import org.eclipse.jgit.lib.PersonIdent;
-import org.eclipse.jgit.lib.RefUpdate;
+import org.eclipse.jgit.revwalk.RevWalk;
 import org.kohsuke.args4j.Argument;
 import org.kohsuke.args4j.Option;
 
@@ -74,55 +71,14 @@ class Tag extends TextBuiltin {
 
 	@Override
 	protected void run() throws Exception {
-		if (object == null) {
-			object = db.resolve(Constants.HEAD);
-			if (object == null)
-				throw die(MessageFormat.format(CLIText.get().cannotResolve, Constants.HEAD));
-		}
-
-		if (!tagName.startsWith(Constants.R_TAGS))
-			tagName = Constants.R_TAGS + tagName;
+		Git git = new Git(db);
+		TagCommand command = git.tag().setForceUpdate(force).setMessage(message).setName(tagName);
 
-		String shortName = tagName.substring(Constants.R_TAGS.length());
-		if (!force && db.resolve(tagName) != null) {
-			throw die(MessageFormat.format(CLIText.get().fatalErrorTagExists
-					, shortName));
+		if (object != null) {
+			RevWalk walk = new RevWalk(db);
+			command.setObjectId(walk.parseAny(object));
 		}
 
-		final ObjectLoader ldr = db.open(object);
-		final ObjectInserter inserter = db.newObjectInserter();
-		final ObjectId id;
-		try {
-			final org.eclipse.jgit.lib.TagBuilder tag;
-
-			tag = new org.eclipse.jgit.lib.TagBuilder();
-			tag.setObjectId(object, ldr.getType());
-			tag.setTagger(new PersonIdent(db));
-			tag.setMessage(message.replaceAll("\r", ""));
-			tag.setTag(shortName);
-			id = inserter.insert(tag);
-			inserter.flush();
-		} finally {
-			inserter.release();
-		}
-
-		RefUpdate ru = db.updateRef(tagName);
-		ru.setForceUpdate(force);
-		ru.setNewObjectId(id);
-		ru.setRefLogMessage("tagged " + shortName, false);
-		switch (ru.update()) {
-		case NEW:
-		case FAST_FORWARD:
-		case FORCED:
-			break;
-
-		case REJECTED:
-			throw die(MessageFormat.format(CLIText.get().fatalErrorTagExists,
-					shortName));
-
-		default:
-			throw die(MessageFormat.format(CLIText.get().failedToLockTag,
-					shortName, ru.getResult()));
-		}
+		command.call();
 	}
 }