shinyrmd needs additional empty lines between content and knit meta

[gadenbuie]

If a shiny prerendered or shinyrmd source .Rmd ends with a single newline, the additional content added to support the prerendered format are added immediately after the content. This breaks pandoc's handling of the last line, e.g. it won't be processed into a paragraph tag.

Source

---
title: "shinyrmd issue"
output: 
  html_document:
    keep_md: true
runtime: shinyrmd
---

Here's some standard content, notice only one final empty line in the source file.

Edit: it seems that GitHub formatting removes the trailing empty line of the code block above. It's important that there is only one (or no) final empty line in the source file.

Markdown

---
title: "shinyrmd issue"
output: 
  html_document:
    keep_md: true
runtime: shinyrmd
---

Here's some standard content, notice only one final empty line in the source file.
<!--html_preserve-->
<script type="application/shiny-prerendered" data-context="dependencies">
<!-- ... inline json and other things ... -->

HTML

<!-- ... truncated ... -->

Here’s some standard content, notice only one final empty line in the
source file. <!--html_preserve-->
<script type="application/shiny-prerendered" data-context="dependencies">
<!-- ... inline json and other things ... -->

If only one more line were added at the end of the Rmd source file, we'd have this HTML:

<!-- ... truncated ... -->

<p>Here’s some standard content, notice only one final empty line in the
source file.</p>
<!--html_preserve-->
<script type="application/shiny-prerendered" data-context="dependencies">
<!-- ... inline json and other things ... -->

[cderv]

Thanks. That is quite a specific issue ! Indeed Pandoc won't see that as a paragraph. I guess adding a blank line before inserting the preserve part should be enough.

I noticed that we are still using <!--html_preserve--> keyword. I wonder if we should switch to using Pandoc's raw block but I guess there is no need and too many risk to break something 😄

Curious how did you found this one ! 😅

[github-actions]

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