local buffer=require("buffer")
local tty_stream=require("tty").stream

local core_stdin=buffer.new("r",tty_stream)
local core_stdout=buffer.new("w",tty_stream)
local core_stderr=buffer.new("w",setmetatable(
{
write=function(_,str)
return tty_stream:write("\27[31m"..str.."\27[37m")
end
},{__index=tty_stream}))

core_stdout:setvbuf("no")
core_stderr:setvbuf("no")
core_stdin.tty=true
core_stdout.tty=true
core_stderr.tty=true

core_stdin.close=tty_stream.close
core_stdout.close=tty_stream.close
core_stderr.close=tty_stream.close

local io_mt=getmetatable(io)or{}
io_mt.__index=function(_,k)
return
k=='stdin'and io.input()or
k=='stdout'and io.output()or
k=='stderr'and io.error()or
nil
end

setmetatable(io,io_mt)

io.input(core_stdin)
io.output(core_stdout)
io.error(core_stderr)