/**
 * $Id$
 * $Date$
 *
 */

package org.xmlsh.builtin.commands;

import java.io.File;
import java.util.List;
import org.xmlsh.core.BuiltinCommand;
import org.xmlsh.core.XValue;
import org.xmlsh.core.XVariable;
import org.xmlsh.sh.shell.ShellConstants;

public class xcd extends BuiltinCommand {

  @Override
  public int run(List<XValue> args) throws Exception {
    mLogger.entry();
    String sdir = null;
    String oldpwd = mShell.getEnv().getVarString(ShellConstants.ENV_PWD);
    if(args.size() < 1) {
      XVariable xhome = mShell.getEnv().getVar(ShellConstants.ENV_HOME);
      String home = xhome == null ? null : xhome.getValue().toString();
      if(home == null)
        home = System.getProperty(ShellConstants.PROP_USER_HOME);
      if(home == null) {
        mShell.printErr("cd: Cannot cd to HOME");
        return 1;
      }
      sdir = home;
    }
    else
      sdir = args.get(0).toString();

    if(sdir.equals("-"))
      sdir = mShell.getEnv().getVarString(ShellConstants.ENV_OLDPWD);

    File newDir = mShell.getFile(sdir);
    if(newDir != null && newDir.exists() && newDir.isDirectory()
        && newDir.canRead()) {
      mShell.setCurdir(newDir);
      mShell.getEnv().setVar(ShellConstants.ENV_OLDPWD, oldpwd);
      return 0;
    }
    else {
      mShell.printErr("cd: Cannot cd to: " + sdir);
      return 1;
    }

  }

}
//
//
// Copyright (C) 2008-2014 David A. Lee.
//
// The contents of this file are subject to the "Simplified BSD License" (the
// "License");
// you may not use this file except in compliance with the License. You may
// obtain a copy of the
// License at http://www.opensource.org/licenses/bsd-license.php
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is David A. Lee
//
// Portions created by (your name) are Copyright (C) (your legal entity). All
// Rights Reserved.
//
// Contributor(s): none.
//