1 generate_md_episodes <- function() {
3 if (require("knitr") && packageVersion("knitr") < '1.9.19')
4 stop("knitr must be version 1.9.20 or higher")
6 if (!require("stringr"))
7 stop("The package stringr is required for generating the lessons.")
9 if (require("checkpoint") && packageVersion("checkpoint") >= '0.4.0') {
11 checkpoint:::scanForPackages(project = "_episodes_rmd",
12 verbose=FALSE, use.knitr = TRUE)$pkgs
14 stop("The checkpoint package (>= 0.4.0) is required to build the lessons.")
17 missing_pkgs <- required_pkgs[!(required_pkgs %in% rownames(installed.packages()))]
19 if (length(missing_pkgs)) {
20 message("Installing missing required packages: ",
21 paste(missing_pkgs, collapse=", "))
22 install.packages(missing_pkgs)
25 ## find all the Rmd files, and generate the paths for their respective outputs
26 src_rmd <- list.files(pattern = "??-*.Rmd$", path = "_episodes_rmd", full.names = TRUE)
27 dest_md <- file.path("_episodes", gsub("Rmd$", "md", basename(src_rmd)))
29 ## knit the Rmd into markdown
30 mapply(function(x, y) {
31 knitr::knit(x, output = y)
36 generate_md_episodes()