Fix #154: pandoc warning during exercise knit (#155)

* Fix #154: pandoc warning during exercise knit Fixes this warning: [WARNING] This document format requires a nonempty <title> element. Please specify either 'title' or 'pagetitle' in the metadata. Falling back to 'exercise.knit.utf8' * Update NEWS
rstudio · Mar 26, 2018 · cf6430c · cf6430c
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diff --git a/NEWS.md b/NEWS.md
@@ -1,3 +1,8 @@
+learnr 0.9.3
+===========
+
+* Fixed a spurious console warning when running exercises using Pandoc 2.0. ([#154](https://github.com/rstudio/learnr/issues/154))
+
 learnr 0.9.2
 ===========
 

diff --git a/R/exercise.R b/R/exercise.R
@@ -205,7 +205,8 @@ evaluate_exercise <- function(exercise, envir) {
     knitr = knitr_options,
     pandoc = NULL,
     base_format = rmarkdown::html_fragment(
-                    df_print = exercise$options$exercise.df_print
+                    df_print = exercise$options$exercise.df_print,
+                    pandoc_args = c("--metadata", "pagetitle=PREVIEW")
                   )
   )