Improved the dice rolling algo

shared/naturalCrit/rollDice.js

@@ -0,0 +1,32 @@
+var _ = require('lodash');
+
+module.exports = function(notation){
+	notation = notation.replace(/ /g,'');
+	var parts = notation.split(/(?=[\-\+])/g);
+
+	return _.reduce(parts, function(r, part){
+		if(!_.isNumber(r)) return r;
+		var res = 0;
+		var neg = false;
+		if(part[0] == '-') neg = true;
+		if(part[0] == '-' || part[0] == '+') part = part.substring(1);
+
+		//Check for dice
+		if(part.indexOf('d') !== -1){
+			var numDice = part.split('d')[0];
+			var die = part.split('d')[1];
+
+			var diceRolls = _.times(numDice, function(){
+				return _.random(1, die);
+			});
+			res = _.sum(diceRolls);
+			if(numDice == 1 && die == 20){
+				if(diceRolls[0] == 1)  return 'Fail!';
+				if(diceRolls[0] == 20) return 'Crit!';
+			}
+		}else{
+			res = part * 1;
+		}
+		return r + (neg ? -res : res);
+	}, 0)
+}