Lua-System docs

## terminalsize.lua

    local sys = require("system")

    sys.autotermrestore()  -- set up auto restore of terminal settings on exit

    -- setup Windows console to handle ANSI processing
    sys.setconsoleflags(io.stdout, sys.getconsoleflags(io.stdout) + sys.COF_VIRTUAL_TERMINAL_PROCESSING)
    sys.setconsoleflags(io.stdin, sys.getconsoleflags(io.stdin) + sys.CIF_VIRTUAL_TERMINAL_INPUT)

    -- setup Posix to disable canonical mode and echo
    local of_attr = sys.tcgetattr(io.stdin)
    sys.setnonblock(io.stdin, true)
    sys.tcsetattr(io.stdin, sys.TCSANOW, {
      lflag = of_attr.lflag - sys.L_ICANON - sys.L_ECHO, -- disable canonical mode and echo
    })

    -- generate string to move cursor horizontally
    -- positive goes right, negative goes left
    local function cursor_move_horiz(n)
      if n == 0 then
        return ""
      end
      return "\27[" .. (n > 0 and n or -n) .. (n > 0 and "C" or "D")
    end

    local rows, cols
    print("Change the terminal window size, press any key to exit")
    while not sys.readansi(0.2) do  -- use readansi to not leave stray bytes in the input buffer
      local nrows, ncols = sys.termsize()
      if rows ~= nrows or cols ~= ncols then
        rows, cols = nrows, ncols
        local text = "Terminal size: " .. rows .. "x" .. cols .. "     "
        io.write(text .. cursor_move_horiz(-#text))
        io.flush()
      end
    end

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