Smart Double Brackets

script

// Smart bracket key

// If a selection is present, wrap the text in brackets. If no selection, scan text for last bracket and close it if last one was an open bracket, or insert open bracket if not.

var open = "[[";
var close = "]]";

var range = editor.getSelectedRange();
var priorText = editor.getTextInRange(0, range[0]);

if (range[1] > 0) { 
 //text selected, wrap it!
 editor.setSelectedText(open + editor.getSelectedText() + close);
 editor.setSelectedRange(range[0] + range[1] + open.length + close.length, 0);
}
else {
 // no selection, find last 
 var lastOpen = priorText.lastIndexOf(open);
 var lastClose = priorText.lastIndexOf(close);
 
 if	(lastOpen == -1 || lastClose > lastOpen) { // no close, use open
   editor.setSelectedText(open);
   editor.setSelectedRange(range[0]+open.length, 0);
 }
 else { // close last open
   editor.setSelectedText(close);
   editor.setSelectedRange(range[0]+close.length, 0);
 }
}