Lua-System docs

## compat.lua

    -- This example shows how to remove platform differences to create a
    -- cross-platform level playing field.

    local sys = require "system"

    if sys.windows then
      -- Windows holds multiple copies of environment variables, to ensure getenv
      -- returns what setenv sets we need to use the system.getenv instead of
      -- os.getenv.
      os.getenv = sys.getenv  -- luacheck: ignore

      -- Set console output to UTF-8 encoding.
      sys.setconsoleoutputcp(sys.CODEPAGE_UTF8)

      -- Set up the terminal to handle ANSI escape sequences on Windows.
      if sys.isatty(io.stdout) then
        sys.setconsoleflags(io.stdout, sys.getconsoleflags(io.stdout) + sys.COF_VIRTUAL_TERMINAL_PROCESSING)
      end
      if sys.isatty(io.stderr) then
        sys.setconsoleflags(io.stderr, sys.getconsoleflags(io.stderr) + sys.COF_VIRTUAL_TERMINAL_PROCESSING)
      end
      if sys.isatty(io.stdin) then
        sys.setconsoleflags(io.stdin, sys.getconsoleflags(io.stdout) + sys.ENABLE_VIRTUAL_TERMINAL_INPUT)
      end

    else
      -- On Posix, one can set a variable to an empty string, but on Windows, this
      -- will remove the variable from the environment. To make this consistent
      -- across platforms, we will remove the variable from the environment if the
      -- value is an empty string.
      local old_setenv = sys.setenv
      function sys.setenv(name, value)
        if value == "" then value = nil end
        return old_setenv(name, value)
      end
    end

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