local shell=require("shell")
local tty=require("tty")

local args=shell.parse(...)
local gpu=tty.gpu()

if#args==0 then
local w,h=gpu.getViewport()
io.write(w," ",h,"\n")
return
end

if#args~=2 then
print("Usage: resolution [<width> <height>]")
return
end

local w=tonumber(args[1])
local h=tonumber(args[2])
if not w or not h then
io.stderr:write("invalid width or height\n")
return 1
end

local result,reason=gpu.setResolution(w,h)
if not result then
if reason then
io.stderr:write(reason..'\n')
end
return 1
end
tty.clear()