# These settings control the behavior of all chunks in the novice R materials. # For example, to generate the lessons with all the output hidden, simply change # `results` from "markup" to "hide". # For more information on available chunk options, see # http://yihui.name/knitr/options#chunk_options library("knitr") fix_fig_path <- function(pth) file.path("..", pth) ## We set the path for the figures globally below, so if we want to ## customize it for individual episodes, we can append a prefix to the ## global path. For instance, if we call knitr_fig_path("01-") in the ## first episode of the lesson, it will generate the figures in ## `fig/rmd-01-` knitr_fig_path <- function(prefix) { new_path <- paste0(opts_chunk$get("fig.path"), prefix) opts_chunk$set(fig.path = new_path) } ## We use the rmd- prefix for the figures generated by the lessons so ## they can be easily identified and deleted by `make clean-rmd`. The ## working directory when the lessons are generated is the root so the ## figures need to be saved in fig/, but when the site is generated, ## the episodes will be one level down. We fix the path using the ## `fig.process` option. opts_chunk$set(tidy = FALSE, results = "markup", comment = NA, fig.align = "center", fig.path = "fig/rmd-", fig.process = fix_fig_path, fig.width = 8.5, fig.height = 8.5, fig.retina = 2) # The hooks below add html tags to the code chunks and their output so that they # are properly formatted when the site is built. hook_in <- function(x, options) { lg <- tolower(options$engine) style <- paste0(".language-", lg) stringr::str_c("\n\n~~~\n", paste0(x, collapse="\n"), "\n~~~\n{: ", style, "}\n\n") } hook_out <- function(x, options) { x <- gsub("\n$", "", x) stringr::str_c("\n\n~~~\n", paste0(x, collapse="\n"), "\n~~~\n{: .output}\n\n") } hook_error <- function(x, options) { x <- gsub("\n$", "", x) stringr::str_c("\n\n~~~\n", paste0(x, collapse="\n"), "\n~~~\n{: .error}\n\n") } hook_warning <- function(x, options) { x <- gsub("\n$", "", x) stringr::str_c("\n\n~~~\n", paste0(x, collapse = "\n"), "\n~~~\n{: .warning}\n\n") } knit_hooks$set(source = hook_in, output = hook_out, warning = hook_warning, error = hook_error, message = hook_out)