/*

 * Reverse_Lines.bsh - a BeanShell macro script for reversing the order

 * of lines in a buffer.  If there are selections, the lines in the selections

 * will be reversed, otherwise the whole buffer will be reversed.

 * NOTE: Lines are not sorted or reverse sorted, simply reversed.

 *

 * Copyright (C) 2002 Ollie Rutherfurd, oliver@rutherfurd.net

 *

 * :mode=beanshell:tabSize=4:indentSize=4:maxLineLen=0:noTabs=false:

 * :indentOnTab=true:indentOnEnter=true:folding=explicit:collapseFolds=1:

 

 * {{{ License

 * 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 the jEdit program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

 * }}}

 *

 * $Id: Reverse_Lines.bsh 28 2003-03-25 22:40:28Z oliver $

 */



void ReverseLines(textArea)

{

	Buffer buffer = textArea.getBuffer();

	Selection[] selections = textArea.getSelection();



	// doesn't work with rectangular selections, check for them up-front

	for(int i = 0; i < selections.length; i++)

	{

		if(selections[i] instanceof Selection.Rect)

		{

			//Toolkit.getDefaultToolkit().beep();

			Macros.error(view, "Sorry, this macro doesn't work with Rectangular Selections.");

			return;

		}

	}



	buffer.beginCompoundEdit();



	// do whole buffer if no selections

	if(selections.length == 0){

		StringBuffer sb = new StringBuffer(buffer.getLength());

		for(int i = buffer.getLineCount() - 1; i >= 0; i--){

			String line = buffer.getLineText(i);

			sb.append(line);

			if(i > 0)	// don't append a newline for the last line

				sb.append('\n');

		}

		buffer.remove(0, buffer.getLength());

		buffer.insert(0, sb.toString());

	}

	// reverse all lines that are selected *NOT* just selected portions of lines

	else{



		for(int i = 0; i < selections.length; i++){



			int startLine = selections[i].getStartLine();

			int endLine = selections[i].getEndLine();

			int startOffset = buffer.getLineStartOffset(startLine);



			if(startLine < endLine){



				StringBuffer sb = new StringBuffer();

				for(int i = endLine; i > startLine; i--){

					String line = buffer.getLineText(i);

					sb.append(line).append('\n');

				}



				// appending first line here, so a check

				// can be made to see whether to append

				// a newline (don't if the original line

				// was the last line of the buffer)

				sb.append(buffer.getLineText(startLine));

				if(endLine < buffer.getLineCount() - 1)

					sb.append('\n');



				String reversed = sb.toString();

				buffer.remove(startOffset, reversed.length());

				buffer.insert(startOffset, reversed);

			}

		}

	}

	buffer.endCompoundEdit();

}



ReverseLines(textArea);