Detect

local mon = peripheral.find("monitor")
local x,y = mon.getSize()
mon.setBackgroundColor(colors.blue)
mon.clear()
local xC,yC = math.floor((x+1)/2),math.floor((y+1)/2)
term.clear()
paintutils.drawLine(5,3,26,3,colors.gray)
term.setTextColor(colors.white)
term.setCursorPos(5,3)
term.write("Quel joueur détecter ?")
paintutils.drawLine(5,5,14,5,colors.lightGray)
term.setTextColor(colors.lightBlue)
term.setCursorPos(5,5)
local name = read()
mon.setCursorPos(xC-14,yC-2)
mon.setTextColor(colors.yellow)
mon.write(name.." se trouve à      blocs")
while true do
local i = 1
while not commands.exec("/testfor @a[name="..name..",r="..i.."]") do
  i = i + 1
end
term.setCursorPos(5,7)
term.setBackgroundColor(colors.black)
print("                                             ")
term.setCursorPos(5,7)
term.setBackgroundColor(colors.gray)
term.setTextColor(colors.lime)
print(name.." est à "..tostring(i).." blocs.")
mon.setCursorPos((xC-14)+string.len(name)+14,yC-2)
mon.write("    ")
mon.setCursorPos((xC-14)+string.len(name)+14,yC-2)
mon.setTextColor(colors.orange)
mon.write(tostring(i))
end