Add support for --version in JGit CLI

Bug: 419000
Change-Id: I43f5267182ea69d1f9abbff33136e0491c629071
Signed-off-by: Kaloyan Raev <kaloyan.r@zend.com>

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

@@ -258,6 +258,7 @@ usage_displayAListOfAllRegisteredJgitCommands=Display a list of all registered j
 usage_displayAllPossibleMergeBases=display all possible merge bases
 usage_displayThejavaStackTraceOnExceptions=display the Java stack trace on exceptions
 usage_displayThisHelpText=display this help text
+usage_displayVersion=display jgit version
 usage_dstPrefix=show the destination prefix instead of "b/"
 usage_enableTheServiceInAllRepositories=enable the service in all repositories
 usage_exportRepositoriesOverGit=Export repositories over git://

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

@@ -73,6 +73,9 @@ public class Main {
 	@Option(name = "--help", usage = "usage_displayThisHelpText", aliases = { "-h" })
 	private boolean help;
 
+	@Option(name = "--version", usage = "usage_displayVersion")
+	private boolean version;
+
 	@Option(name = "--show-stack-trace", usage = "usage_displayThejavaStackTraceOnExceptions")
 	private boolean showStackTrace;
 
@@ -167,7 +170,7 @@ public class Main {
 		try {
 			clp.parseArgument(argv);
 		} catch (CmdLineException err) {
-			if (argv.length > 0 && !help) {
+			if (argv.length > 0 && !help && !version) {
 				writer.println(MessageFormat.format(CLIText.get().fatalError, err.getMessage()));
 				writer.flush();
 				System.exit(1);
@@ -204,6 +207,11 @@ public class Main {
 			System.exit(1);
 		}
 
+		if (version) {
+			String cmdId = Version.class.getSimpleName().toLowerCase();
+			subcommand = CommandCatalog.get(cmdId).create();
+		}
+
 		final TextBuiltin cmd = subcommand;
 		if (cmd.requiresRepository())
 			cmd.init(openGitDir(gitdir), null);