Commit 3396ab8e authored by John Blischak's avatar John Blischak
Browse files

Add hook so that output from R Markdown chunks which generate a warning 

or an error has the class "error" and appears in red font.

https://github.com/swcarpentry/lesson-example/blob/gh-pages/LAYOUT.md#topics
parent a7c7240a

tools/chunk-options.R

+9 −3
Original line number Diff line number Diff line
@@ -9,7 +9,7 @@ opts_chunk$set(tidy = FALSE, results = "markup", comment = NA, 
               fig.align = "center", fig.path = "fig/")



# The hooks below add html tags to the code chunks and their output so that they

# are properly formatted when the site is built with jekyll.

# are properly formatted when the site is built.

hook_in <- function(x, options) {

  stringr::str_c("\n\n~~~{.r}\n",

                 paste0(x, collapse="\n"),
@@ -22,5 +22,11 @@ hook_out <- function(x, options) { 
                 "\n~~~\n\n")

}



knit_hooks$set(source = hook_in, output = hook_out, warning = hook_out,

               error = hook_out, message = hook_out)
 
hook_error <- function(x, options) {

  stringr::str_c("\n\n~~~{.error}\n",

                 paste0(x, collapse="\n"),

                 "\n~~~\n\n")

}



knit_hooks$set(source = hook_in, output = hook_out, warning = hook_error,

               error = hook_error, message = hook_out)