/*
 * Squeeze_Empty_Lines.bsh - a BeanShell macro script for the jEdit text editor
 * Copyright (C) 2003 Alexey Vdovichenko
 * tequilacat@mail.ru
 * http://tequilacat.narod.ru
 *
 * 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.
 *
 * Notes on use:
 * This macro is an improvement of standard "Join Lines" function.
 * When there is no selection in buffer, it joins current line and next NON-empty line,  
 *   removing any whitespace content between them.
 * If some text is selected, all empty lines within selected regions are removed.
 * Checked for jEdit 4.1 API
 *
 * Version 1.01: removed annoying debug message box.
 */

//  
void squeezeLine(gnu.regexp.RE re, int from, int to){
  if(from <= to) {
//    Macros.error(view, "Squeeze from "+ from +" to "+ to +"");
    int nLines = to - from + 1;
    
    while(nLines > 0){
  //    Macros.error(view, "line: '"+ textArea.getLineText(from) +"'");
      if(re.isMatch(textArea.getLineText(from))){
        textArea.setCaretPosition(textArea.getLineStartOffset(from));
        textArea.deleteLine();
      }else{
        from++;
      }
      nLines--;
    }
  }
}

void joinLines(gnu.regexp.RE re){
  // last non-whitespace, then look from here to first non-whitespace, and delete between
  textArea.goToEndOfWhiteSpace(false);
  textArea.deleteToEndOfLine();
//  int fromPos = textArea.getCaretPosition();
  int curLine = textArea.getCaretLine()+1;
  
  while(curLine < textArea.getLineCount()){
    textArea.setCaretPosition(textArea.getLineStartOffset(curLine));
    if(re.isMatch(textArea.getLineText(curLine))){ // empty line
      textArea.deleteLine();
    }else{
      // remove from 1st line offset to first non-whitespace
      textArea.goToStartOfWhiteSpace(false);
      textArea.deleteToStartOfLine();
      textArea.backspace();
      break;
    }
  }
}

void squeeze(){
  selections = textArea.getSelection();
  re = new gnu.regexp.RE("^[ \t]*$");
  
  if(selections.length == 0){
    joinLines(re);
    //squeezeLine(re, 0, textArea.getLineCount()-2);
  }else
  for( i = 0; i < selections.length; ++i){
    selItem = selections[i];
    squeezeLine(re, selItem.getStartLine(), selItem.getEndLine());
  }
  textArea.selectNone();
}

squeeze();