deactivate extension about yaml metadata block for pandoc 2.13+ (#383)

* deactivate extension about yaml metadata block for pandoc 2.13+ * Leave an explanatory comment * Add NEWS bullet Co-authored-by: Jenny Bryan <[email protected]>
tidyverse · Jul 21, 2021 · 293225e · 293225e
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diff --git a/NEWS.md b/NEWS.md
@@ -1,5 +1,7 @@
 # reprex (development version)
 
+`reprex_document()` has been adjusted for compatibility with changes introduced in Pandoc 2.13 around YAML headers (#375, #383 @cderv).
+
 `reprex_rtf()` (and the unexported `prex_rtf()`) work again.
 One of the filepaths involved in the highlight call was borked, but now it's not (#379).
 

diff --git a/R/reprex_document.R b/R/reprex_document.R
@@ -116,7 +116,8 @@ reprex_document <- function(venue = c("gh", "r", "rtf", "html", "slack", "so", "
       opts_chunk = opts_chunk
     ),
     pandoc = rmarkdown::pandoc_options(
-      to = "gfm",
+      # https://github.com/tidyverse/reprex/issues/375
+      to = paste0("gfm", if (rmarkdown::pandoc_available("2.13")) "-yaml_metadata_block"),
       from = rmarkdown::from_rmarkdown(implicit_figures = FALSE),
       ext = ".md",
       args = pandoc_args