#!/usr/bin/gawk -f 
BEGIN {
    FS="\t";
    OFS="\t";
    print  "old", "oldStart", "oldEnd","new", "newStart", "newEnd","newgap";
}


{
    offset = $1;
    oldName = $2;
    oldSize = $3;
    newName = $4;
    newSize = $5;
}

newName != curChrom {
    curChrom = newName;
    prevEnd = 0;
}

{
    print oldName, 0, oldSize, newName, offset, offset+oldSize, offset-prevEnd;
    prevEnd = offset+oldSize;
}