// groupSequentiellNum.2jsx  
  
//DESCRIPTION: 1, 2, 4, 5, 6 -> 1, 2, 4-6   
  
var s = app.selection[0].parentStory;  
app.findGrepPreferences = app.changeGrepPreferences = NothingEnum.nothing;  
  
app.findGrepPreferences.findWhat = '\\d+, ([\\d+, ])+';  
var r = s.findGrep();  
for ( aLine = r.length-1; aLine >= 0; aLine-- )  
	r[aLine].contents= checkOneLine ( r[aLine].contents );  
  
function checkOneLine ( aString )  
{  
	var a = aString.split( ', ');  
	for ( var i = 0; i < aString.length-1; i++ )  
	{  
		var k = i +1; 
		while ( k < aString.length && a[k] == Number( a[k-1] ) + 1)  
		{  
			k++;  
		}  
		if ( k > i+2 && Number(a[k-1]) >  Number( a[i] ) )  // 1, 2, 4, 5, 6 -> 1, 2, 4-6   
//		if ( Number(a[k-1]) >  Number( a[i] ) ) 	// 1, 2, 4, 5, 6 -> 1–2, 4-6   
		{  
			a[i] = a[i] + '–' + a[k-1];  
			a.splice( i+1, k-1-i );  
		}  
	}  
	return  a.join( ', ');  
}