if Preview

local p = {}  local cfg = mw.loadData('Module:If preview/configuration')  --[[ main  This function returns either the first argument or second argument passed to this module, depending on whether the page is being previewed.  ]] function p.main(frame) if cfg.preview then return frame.args[1] or '' else return frame.args[2] or '' end end  --[[ pmain  This function returns either the first argument or second argument passed to this module's parent (i.e. template using this module), depending on whether it is being previewed.  ]] function p.pmain(frame) return p.main(frame:getParent()) end   local function warning_text(warning) return mw.ustring.format( cfg.warning_infrastructure, cfg.templatestyles, warning ) end  function p._warning(args)  local warning = args[1] and args[1]:match('^%s*(.-)%s*$') or '' if warning == '' then return warning_text(cfg.missing_warning) end  if not cfg.preview then return '' end  return warning_text(warning) end  --[[ warning  This function returns a "preview warning", which is the first argument marked up with HTML and some supporting text, depending on whether the page is being previewed.  disabled since we'll implement the template version in general  ]] --function p.warning(frame) --return p._warning(frame.args) --end  --[[ warning, but for pass-through templates like {{preview warning}} ]] function p.pwarning(frame) return p._warning(frame:getParent().args) end  return p