gistfile1.lua

local _docTable = {}

function document(docStr)
    return function(thingToDocument)
        _docTable[thingToDocument] = docStr
    end
end
document[[Adds documentation for a function]](document)

function help(thingToLookup)
    local ret =  _docTable[thingToLookup] or "Help not found"
    print(ret)
    return ret
end

help(document)