将Knitr块保存到R文件 [英] Save knitr chunk to R file

问题描述

在knitr中，有一个read_chunk函数将外部代码读入块中.是否可以逆转该过程.也就是说，创建一个函数write_chunk()来将源代码块中的源代码保存到R文件中?文件名可以与块名相同.

In knitr there is a read_chunk function which read external code into a chunk. Is it possible to reverse the process. That is, make a function write_chunk() which save the source code in the chunk to an R file? The file name may the same as the chunk name.

推荐答案

我找到了使用钩子的解决方案.添加以下钩子:

I found a solution using hooks. Add the following hook:

knit_hooks$set(write_chunk = function(before, options, envir) {
    if (before) {
      fileConn<-file(paste0("chunk_",options$label,".R") )
      writeLines(options$code, fileConn)
      close(fileConn)
    }
})

并在块标题中使用选项<<chunk-name, write_chunk=TRUE>>.

and use option <<chunk-name, write_chunk=TRUE>> in the header of a chunk.

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