monitor = peripheral.wrap("top");

file = fs.open("d.json","r");
d = textutils.unserialize(file.readLine());
file.close();


function adddeath(deadmeat)
  local playerindex = nil;
  for i,plyr in pairs(d) do
    if plyr.p == deadmeat then
      playerindex = i;
    end
  end
  if not playerindex then
    playerindex = #d+1;
    d[playerindex] = { };
    d[playerindex].p = deadmeat;
    d[playerindex].d = 0;
  end
  d[playerindex].d = d[playerindex].d + 1;
  file = fs.open("d.json","w");
  file.writeLine(textutils.serialize(d));
  file.close();
end

function sortfn(a,b)
return a.d > b.d;
end

function printlist()
  local ds = table.sort(d,sortfn);
  monitor.clear();
  monitor.setCursorPos(1,1);
  local i;
  monitor.write("Death Counter 3000");
  i = 2;
  for _,p in pairs(d) do
    monitor.setCursorPos(1,i);
    monitor.write(p.p);
    monitor.setCursorPos(17,i);
    monitor.write("|" .. p.d);
    i = i + 1;
  end
end


repeat
  printlist();
  _,p = os.pullEvent("chat_death");
  adddeath(p);
until false