tikhomirov@74: /*
tikhomirov@74:  * Copyright (c) 2010-2011 TMate Software Ltd
tikhomirov@74:  *  
tikhomirov@74:  * This program is free software; you can redistribute it and/or modify
tikhomirov@74:  * it under the terms of the GNU General Public License as published by
tikhomirov@74:  * the Free Software Foundation; version 2 of the License.
tikhomirov@74:  *
tikhomirov@74:  * This program is distributed in the hope that it will be useful,
tikhomirov@74:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@74:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@74:  * GNU General Public License for more details.
tikhomirov@74:  *
tikhomirov@74:  * For information on how to redistribute this software under
tikhomirov@74:  * the terms of a license other than GNU General Public License
tikhomirov@102:  * contact TMate Software at support@hg4j.com
tikhomirov@2:  */
tikhomirov@74: package org.tmatesoft.hg.repo;
tikhomirov@2: 
tikhomirov@2: import java.io.File;
tikhomirov@148: import java.io.IOException;
tikhomirov@148: 
tikhomirov@148: import org.tmatesoft.hg.core.HgException;
tikhomirov@2: 
tikhomirov@2: /**
tikhomirov@148:  * Utility methods to find Mercurial repository at a given location
tikhomirov@74:  * 
tikhomirov@74:  * @author Artem Tikhomirov
tikhomirov@74:  * @author TMate Software Ltd.
tikhomirov@2:  */
tikhomirov@95: public class HgLookup {
tikhomirov@2: 
tikhomirov@148: 	public HgRepository detectFromWorkingDir() throws HgException {
tikhomirov@2: 		return detect(System.getProperty("user.dir"));
tikhomirov@2: 	}
tikhomirov@2: 
tikhomirov@148: 	public HgRepository detect(String location) throws HgException {
tikhomirov@95: 		return detect(new File(location));
tikhomirov@95: 	}
tikhomirov@95: 
tikhomirov@95: 	// look up in specified location and above
tikhomirov@148: 	public HgRepository detect(File location) throws HgException {
tikhomirov@95: 		File dir = location;
tikhomirov@2: 		File repository;
tikhomirov@2: 		do {
tikhomirov@2: 			repository = new File(dir, ".hg");
tikhomirov@2: 			if (repository.exists() && repository.isDirectory()) {
tikhomirov@2: 				break;
tikhomirov@2: 			}
tikhomirov@2: 			repository = null;
tikhomirov@2: 			dir = dir.getParentFile();
tikhomirov@2: 			
tikhomirov@2: 		} while(dir != null);
tikhomirov@2: 		if (repository == null) {
tikhomirov@95: 			// return invalid repository
tikhomirov@95: 			return new HgRepository(location.getPath());
tikhomirov@2: 		}
tikhomirov@148: 		try {
tikhomirov@148: 			String repoPath = repository.getParentFile().getCanonicalPath();
tikhomirov@148: 			return new HgRepository(repoPath, repository);
tikhomirov@148: 		} catch (IOException ex) {
tikhomirov@148: 			throw new HgException(location.toString(), ex);
tikhomirov@148: 		}
tikhomirov@4: 	}
tikhomirov@2: }