Live preview not working with rmd using `bookdown::render_book`

[renkun-ken]

Consider the following rmd using bookdown::render_book provided in #855:

---
output: bookdown::gitbook
knit: bookdown::render_book
---

# Test

Para.

---

# Next

Live preview does not work with such document:

processing file: main.Rmd


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  |                                                                      |   0%

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  ordinary text without R code




output file: /Users/ken/.vscode-R/tmp/main.knit.md


Error in relativeTo(basepath, dir) : 
  The path /Users/ken/Workspaces/test/rbook/libs/header-attrs-2.11 does not appear to be a descendant of /Users/ken/.vscode-R/tmp/
Calls: cat ... html_dependencies_as_string -> lapply -> FUN -> relativeTo

Backtrace:

1: stop("The path ", file, " does not appear to be a descendant of ", 
2: relativeTo(basepath, dir)
3: FUN(X[[i]], ...)
4: lapply(dependencies, makeDependencyRelative, basepath = output_dir, 
5: html_dependencies_as_string(dependencies, lib_dir, output_dir)

6: as_tmpfile(html_dependencies_as_string(dependencies, lib_dir, 
7: pandoc_html_extras_args(extras, self_contained, lib_dir, output_dir)
8: base(...)

9: output_format$pre_processor(front_matter, input, runtime, knit_meta, 
10: rmarkdown::render(file_path, output_format = set_html, output_file = output_file_loc, 

11: cat(lim, rmarkdown::render(file_path, output_format = set_html, 

Execution halted

[VSC-R] main.Rmd process exited with exit code 1

Looks like rendering to ~/.vscode-R/tmp makes the paths inconsistent.

[cherryamme]

I meet the same problem . shows : 'Error in relativeTo(basepath, dir) : The path $WORKDIR/libs/header-attrs-2.9 does not appear to be a descendant of $HOME/.vscode-R/tmp/ Calls: cat ... html_dependencies_as_string -> lapply -> FUN -> relativeTo'

[ElianHugh]

It looks like this is also an issue with the bookdown format and outputs that use libs in general. We can get around this by using output_options = list(self_contained = TRUE. However, we run into another problem -- bookdown is not respecting the output_dir argument. So no matter what we specify, the files will always be knit to the working directory, leading to another error

[SuibianP]

I am also running into this issue as well trying to use the revealjs package which is a Rmd wrapper around the reveal.js presentation framework. The output is rendered as if it were a plain Markdown file. However, it does work correctly if I directly invoke rmarkdown::render from the console.

I tried to add self_contained = true as per https://github.com/rstudio/revealjs#document-dependencies, to no avail.

• Is there any workaround without touching the extension itself to modify output_options?

this is also an issue with the bookdown format and outputs that use libs in general

• What is the blocker for this, if rmarkdown::render just works?

I am very new to R and Rmd, and sorry if any of these questions sounds nonsensical.

[ElianHugh]

Hi @SuibianP ,

Thank you for the comment. It's been a little while since I looked at this so I may need a refresher.

I haven't used revealjs before so I'll have to look into the specific reason it doesn't work. If it's a lib folder problem like bookdown, it's because our preview mechanism generates an html file in a temporary folder, and expects the file to work as-is. An issue I ran into with bookdown was that there was no way of telling it where to put the lib folder that worked at the time = file can't knit

Custom knit and rmarkdown::render don't run into this problem because we don't try to hide the knit files in a temporary folder.

[SuibianP]

Hi @ElianHugh,

Thanks for the reply. I tried to diff the pandoc command lines and here is what I think makes the difference,

 --to
-html4
+revealjs
 --from
-markdown+autolink_bare_uris+tex_math_single_backslash
+markdown+autolink_bare_uris+tex_math_single_backslash-implicit_figures

Seems that the output key in the front matter (revealjs::revealjs_presentation) is not respected?

[SuibianP]

The relevant snippet seems to be https://github.com/rstudio/revealjs/blob/e1893aed9df79d26db48538ace56cc0d55ae2f0c/R/revealjs_presentation.R#L319.

Is it that the pandoc options not respected for render_site?

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