Opt-out bookdown environment definition for lipic article (#393)

This is done inside the setup chunk of the skeleton.Rmd
rstudio · Jun 9, 2021 · b348d83 · b348d83
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diff --git a/NEWS.md b/NEWS.md
@@ -1,6 +1,8 @@
 rticles 0.20
 ---------------------------------------------------------------------
 
+- `lipics_article()` skeleton now sets option `bookdown.theorem.preamble` to FALSE to work with `bookdown::pdf_book()` and avoid conflicst in theorem environment definition. This requires **bookdown** 0.23 or higher (#392).
+
 - `oup_article()` template now largely compatible to that of `elsevier_article()` (thanks, @dmkaplan2000, #403)
 
 - `elsevier_article()` now supports `biblio-style` Pandoc's variable to set the natbib bibliography style in YAML header (thanks, @gregmacfarlane, #402).

diff --git a/inst/rmarkdown/templates/lipics/skeleton/skeleton.Rmd b/inst/rmarkdown/templates/lipics/skeleton/skeleton.Rmd
@@ -173,8 +173,16 @@ appendix: |
   List of different predefined enumeration styles:
 output:
   rticles::lipics_article: default
+  # To use with bookdown feature
+  bookdown::pdf_book:
+    base_format: rticles::lipics_article
 ---
 
+```{r setup, include = FALSE}
+# deactivate addition of preamble when this format is used with bookdown
+options(bookdown.theorem.preamble = FALSE)
+```
+
 # Typesetting instructions -- Summary
 
 LIPIcs is a series of open access high-quality conference proceedings across all fields in informatics established in cooperation with Schloss Dagstuhl.