///////    File: arbsortlines.C    ///////
//  applying arbqsort to TextLines object 
//
//  To compile:
//  CC arbsortl.o ../arbsort/arbqsort.o SortKey.o TxtLines.o

#include        <iostream.h>
#include        <stdlib.h>
#include        "TextLines.h"
#include        "SortKey.h"
#include        "../arbsort/arbqsort.h"


int keycmp(TextLines *tl, int i, int j)
{ extern SortKey sortkey;
  TextLines& txtobj= *tl;
     return( sortkey.cmp(txtobj[i], txtobj[j]) );
}

void lineswap(TextLines *tl, int i, int j)
{    tl->swap(i,j);    }

SortKey sortkey;   // default global sort key

int main(int argc, String argv[])
{    if (argc > 2)
     {   cerr << "Usage: " << argv[0] << " key_position\n";
         exit(1);
     }
     if (argc == 2)
         sortkey = SortKey(atoi(argv[1]));
     TextLines txtobj;
     txtobj.input(cin);
     quicksort(&txtobj, 0, txtobj.length()-1,
               CMP_FN(keycmp), SWAP_FN(lineswap));
     txtobj.display();
     return(0);
}