从函数内部将函数环境设置为调用环境（parent.frame）的函数环境

I am still struggling with R scoping and environments. I would like to be able to construct simple helper functions that get called from my 'main' functions that can directly reference all the variables within those main functions - but I don't want to have to define the helper functions within each of my main functions. I am still struggling with R scoping and enviro