CLI: implement option -d for deleting tags

Change-Id: I438456b76aefd361384729686271288186d3be3b
Signed-off-by: Ned Twigg <ned.twigg@diffplug.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/TagTest.java

@@ -46,6 +46,7 @@ import static org.junit.Assert.assertEquals;
 
 import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.lib.CLIRepositoryTestCase;
+import org.eclipse.jgit.lib.Ref;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -70,4 +71,26 @@ public class TagTest extends CLIRepositoryTestCase {
 		assertEquals("fatal: tag 'test' already exists",
 				executeUnchecked("git tag test")[0]);
 	}
+
+	@Test
+	public void testTagDelete() throws Exception {
+		git.tag().setName("test").call();
+
+		Ref ref = git.getRepository().getTags().get("test");
+		assertEquals("refs/tags/test", ref.getName());
+
+		assertEquals("", executeUnchecked("git tag -d test")[0]);
+		Ref deletedRef = git.getRepository().getTags().get("test");
+		assertEquals(null, deletedRef);
+	}
+
+	@Test
+	public void testTagDeleteFail() throws Exception {
+		try {
+			assertEquals("fatal: error: tag 'test' not found.",
+					executeUnchecked("git tag -d test")[0]);
+		} catch (Die e) {
+			assertEquals("fatal: error: tag 'test' not found", e.getMessage());
+		}
+	}
 }

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

@@ -200,6 +200,7 @@ switchedToNewBranch=Switched to a new branch ''{0}''
 switchedToBranch=Switched to branch ''{0}''
 tagAlreadyExists=tag ''{0}'' already exists
 tagLabel=tag
+tagNotFound=error: tag ''{0}'' not found.
 taggerInfo=Tagger: {0} <{1}>
 timeInMilliSeconds={0} ms
 treeIsRequired=argument tree is required
@@ -386,6 +387,7 @@ usage_srcPrefix=show the source prefix instead of "a/"
 usage_symbolicVersionForTheProject=Symbolic version for the project
 usage_tags=fetch all tags
 usage_notags=do not fetch tags
+usage_tagDelete=delete tag
 usage_tagMessage=tag message
 usage_untrackedFilesMode=show untracked files
 usage_updateRef=reference to update

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

@@ -68,6 +68,9 @@ class Tag extends TextBuiltin {
 	@Option(name = "-f", usage = "usage_forceReplacingAnExistingTag")
 	private boolean force;
 
+	@Option(name = "-d", usage = "usage_tagDelete")
+	private boolean delete;
+
 	@Option(name = "-m", metaVar = "metaVar_message", usage = "usage_tagMessage")
 	private String message = ""; //$NON-NLS-1$
 
@@ -81,6 +84,14 @@ class Tag extends TextBuiltin {
 	protected void run() throws Exception {
 		try (Git git = new Git(db)) {
 			if (tagName != null) {
+				if (delete) {
+					List<String> deletedTags = git.tagDelete().setTags(tagName)
+							.call();
+					if (deletedTags.isEmpty()) {
+						throw die(MessageFormat
+								.format(CLIText.get().tagNotFound, tagName));
+					}
+				} else {
 					TagCommand command = git.tag().setForceUpdate(force)
 							.setMessage(message).setName(tagName);
 
@@ -92,8 +103,9 @@ class Tag extends TextBuiltin {
 					try {
 						command.call();
 					} catch (RefAlreadyExistsException e) {
-					throw die(MessageFormat.format(CLIText.get().tagAlreadyExists,
-							tagName));
+						throw die(MessageFormat.format(
+								CLIText.get().tagAlreadyExists, tagName));
+					}
 				}
 			} else {
 				ListTagCommand command = git.tagList();

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

@@ -269,6 +269,7 @@ public class CLIText extends TranslationBundle {
 	/***/ public String switchedToBranch;
 	/***/ public String tagAlreadyExists;
 	/***/ public String tagLabel;
+	/***/ public String tagNotFound;
 	/***/ public String taggerInfo;
 	/***/ public String timeInMilliSeconds;
 	/***/ public String tooManyRefsGiven;