Insert comment in YAML header advising not to edit

        knitr::knit(x, output = y)

    }, src_rmd, dest_md)

    # Read the generated md files and add comments advising not to edit them

    sapply(dest_md, function(y) {

      con = file(y)

      mdfile <- readLines(con)

      if (mdfile[1] != "---")

        stop("Input file does not have a valid header")

        mdfile <- append(mdfile, "# Please do not edit this file directly; it is auto generated.", after = 1)

        mdfile <- append(mdfile, paste("# Instead, please edit", 

                                       basename(y), "in _episodes_rmd/"), after = 2)

        writeLines(mdfile, con)

    })    

}

generate_md_episodes()