unsubst

local p = {}  local specialParams = { ['$N'] = 'template name', ['$B'] = 'template content', }  p[''] = function ( frame ) if not frame:getParent() then error( '{{#invoke:Unsubst|unsubst}} makes no sense without a parent frame' ) end for k, v in pairs( specialParams ) do if not frame.args[k] then error( '{{#invoke:Unsubst|unsubst}} requires parameter ' .. k .. ' (' .. v .. ')' ) end end  if mw.isSubsting() then ---- substing -- Combine passed args with passed defaults local args = {} for k, v in pairs( frame.args ) do if not specialParams[k] then if v == '__DATE__' then v = mw.getContentLanguage():formatDate( 'F Y' ) end args[k] = v end end for k, v in pairs( frame:getParent().args ) do args[k] = v end  -- Now, build an equivalent template invocation -- First numbered args, then named local ret = '{{' .. frame.args['$N'] for k, v in ipairs( args ) do if string.find( v, '=', 1, true ) then -- likely something like 1=foo=bar, we need to do it as a named arg break end ret = ret .. '|' .. v args[k] = nil end for k, v in pairs( args ) do ret = ret .. '|' .. k .. '=' .. v end  return ret .. '}}' else ---- Not substing -- Just return the "body" return frame.args['$B'] end end  return p