/*
    * Copyright (C) 2009, Daniel Cheng (aka SDiZ) <git@sdiz.net>
    * Copyright (C) 2009, Daniel Cheng (aka SDiZ) <j16sdiz+freenet@gmail.com>
    * Copyright (C) 2015 Thomas Meyer <thomas@m3y3r.de> and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
   * SPDX-License-Identifier: BSD-3-Clause
   */
  
  package org.eclipse.jgit.pgm;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.eclipse.jgit.lib.ObjectId;
  import org.eclipse.jgit.lib.Ref;
  import org.eclipse.jgit.pgm.internal.CLIText;
  import org.eclipse.jgit.pgm.opt.CmdLineParser;
  import org.kohsuke.args4j.Argument;
  import org.kohsuke.args4j.CmdLineException;
  import org.kohsuke.args4j.Option;
  
  @Command(usage = "usage_RevParse")
  class RevParse extends TextBuiltin {
  	@Option(name = "--all", usage = "usage_RevParseAll")
  	boolean all;
  
  	@Option(name = "--verify", usage = "usage_RevParseVerify")
  	boolean verify;
  
  	@Argument(index = 0, metaVar = "metaVar_commitish")
  	private List<ObjectId> commits = new ArrayList<>();
  
  	/** {@inheritDoc} */
  	@Override
  	protected void run() {
  		try {
  			if (all) {
  				for (Ref r : db.getRefDatabase().getRefs()) {
  					ObjectId objectId = r.getObjectId();
  					// getRefs skips dangling symrefs, so objectId should never
  					// be null.
  					if (objectId == null) {
  						throw new NullPointerException();
  					}
  					outw.println(objectId.name());
  				}
  			} else {
  				if (verify && commits.size() > 1) {
  					final CmdLineParser clp = new CmdLineParser(this);
  					throw new CmdLineException(clp,
  							CLIText.format(CLIText.get().needSingleRevision));
  				}
  
  				for (ObjectId o : commits) {
  					outw.println(o.name());
  				}
  			}
  		} catch (IOException | CmdLineException e) {
  			throw die(e.getMessage(), e);
  		}
  	}
  }