function CodeBlock(block)
  if block.classes[1] == "moon" or block.classes[1] == "moonscript" then
    local fname = os.tmpname()
    local handle = io.open(fname, "w")
    handle:write(block.text)
    handle:close()

    local p = io.popen(string.format("pygmentize -f html -l moonscript.py %s -x", fname))
    local out = p:read("*a")
    return pandoc.RawBlock("html", out)
  end
end