/*
 * Delete_Blank_Lines.bsh - Beanshell macro to delete all blank lines
 * from a buffer.  In this case a blank line a taken as a line with
 * no characters on it (not even whitespace characters).
 *
 * Copyright (C) 2002 Lee Turner (lee@leeturner.org)
 * Version 1.0
 *
 * :tabSize=4:indentSize=4:noTabs=false:
 * :folding=explicit:collapseFolds=1:
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

// Lets first check to see if the buffer is readonly as we can't make
// updates to a readonly buffer now can we......
if(buffer.isReadOnly())
{
	Macros.error(view, "This file is read only.");
	return;
}

// Best check to see if they want to do it first.
result = Macros.confirm(view, "Are you sure you want to remove all blank lines from this buffer?",JOptionPane.YES_NO_OPTION);

if(result == JOptionPane.YES_OPTION)
{

	textArea.setCaretPosition(0);
	buffer.beginCompoundEdit();

	try
	{
		while(textArea.getCaretLine()+1 < buffer.getLineCount() )
		{
			textArea.selectLine();
			String selectedLine = textArea.getSelectedText();
			if (selectedLine == null)
			{
				textArea.deleteLine();
			}
			else
			{
				textArea.goToNextLine(false);
			}
		}
	}
	finally
	{
		if(buffer.insideCompoundEdit())
		{
			buffer.endCompoundEdit();
		}
	}
}