[pgm] Add option --heads for ls-remote

TODO: find a way to use option -h which is already captured by
TextBuiltin's option --help which also uses the alias -h.

Bug: 444072
Change-Id: Ie66584c2fc7fc224014a43cf928547703dd9d213
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

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

@@ -93,4 +93,15 @@ public class LsRemoteTest extends CLIRepositoryTestCase {
 				"d0b1ef2b3dea02bb2ca824445c04e6def012c32c	refs/tags/tag3^{}",
 				"" }, result.toArray());
 	}
+
+	@Test
+	public void testLsRemoteHeads() throws Exception {
+		final List<String> result = CLIGitCommand.execute(
+				"git ls-remote --heads "
+				+ db.getDirectory(), db);
+		assertArrayEquals(new String[] {
+				"d0b1ef2b3dea02bb2ca824445c04e6def012c32c	refs/heads/master",
+				"d0b1ef2b3dea02bb2ca824445c04e6def012c32c	refs/heads/test",
+				"" }, result.toArray());
+	}
 }

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

@@ -203,6 +203,7 @@ usage_Gc=Cleanup unnecessary files and optimize the local repository
 usage_Glog=View commit history as a graph
 usage_IndexPack=Build pack index file for an existing packed archive
 usage_LsRemote=List references in a remote repository
+usage_lsRemoteHeads=Show only refs starting with refs/heads
 usage_LsTree=List the contents of a tree object
 usage_MakeCacheTree=Show the current cache tree structure
 usage_MergeBase=Find as good common ancestors as possible for a merge

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

@@ -58,6 +58,9 @@ import org.kohsuke.args4j.Option;
 
 @Command(common = true, usage = "usage_LsRemote")
 class LsRemote extends TextBuiltin {
+	@Option(name = "--heads", usage = "usage_lsRemoteHeads")
+	private boolean heads;
+
 	@Option(name = "--timeout", metaVar = "metaVar_service", usage = "usage_abortConnectionIfNoActivity")
 	int timeout = -1;
 
@@ -67,7 +70,7 @@ class LsRemote extends TextBuiltin {
 	@Override
 	protected void run() throws Exception {
 		LsRemoteCommand command = Git.lsRemoteRepository().setRemote(remote)
-				.setTimeout(timeout);
+				.setTimeout(timeout).setHeads(heads);
 		TreeSet<Ref> refs = new TreeSet<Ref>(new Comparator<Ref>() {
 
 			public int compare(Ref r1, Ref r2) {