/*
Move_Lines_Down.bsh - Beanshell macro to move a selection of lines down by one
line.  This should handle multiple selections, but doesn't work quite right.

Copyright (c) Dale Anson, 2004

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
   3. The name of the author may not be used to endorse or promote products
   derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

// check buffer read-only status
if ( buffer.isReadOnly() ) {
   Macros.error( view, "File is read only." );
   return ;
}

// get the current selection or the current line if no selection
Selection[] selections = textArea.getSelection();

// this doesn't work right with multiple selection, so don't do anything
if (selections.length > 1) {
   Macros.error( view, "Line move does not work with multiple selection." );
   return ;
}

String ls = buffer.getStringProperty( "lineSeparator" );

int line = textArea.getCaretLine();

// make sure last line ends with a line separator
String line_text = textArea.getLineText(textArea.getLineCount() - 1);
if (!line_text.endsWith(ls) && line >= textArea.getLineCount() - 3) {
    buffer.insert(buffer.getLength(), ls);
}

// if nothing is selected, select current line
if (selection == null || selections.length == 0) {
   selections = new Selection[1];
   int start_offset = textArea.getLineStartOffset(line);
   int end_offset = textArea.getLineEndOffset(line);
   selections[0] = new Selection.Range(start_offset, end_offset);
   textArea.addToSelection(selections[0]);
}

// adjust the start and end line offsets to reselect after the move
int[] startLines = new int[selections.length];
int[] endLines = new int[selections.length];
for (int i = 0; i < selections.length; i++) {
   startLines[i] = selections[i].getStartLine() + 1;
   endLines[i] = selections[i].getEndLine() + 1;
}

// cut the selected text, move down one line, and paste it back in
Registers.cut( textArea, '_' );
textArea.goToNextLine( false );
Registers.paste( textArea, '_', false );
textArea.goToPrevLine( false );

// indent lines
for (int i = 0; i < startLines.length; i++) {
    buffer.indentLines( startLines[i] - 1, endLines[i] );
}

// reselect the moved text
textArea.selectNone();
for (int i = 0; i < startLines.length; i++) {
   selection = new Selection.Range(
      textArea.getLineStartOffset( startLines[i] ),
      textArea.getLineStartOffset( endLines[i] )
   );
   textArea.addToSelection(selection);
}



