Vignette fails to be built by pkgdown

Question

I have a R package that I am trying to setup pkgdown for. I'm following the instructions here, and am running build_site() to generate the docs directory. When running this command, I get the error

Quitting from lines 28-29 (Data-Model.Rmd) 
Error : package or namespace load failed for 'dm':
 .onLoad failed in loadNamespace() for 'dm', details:
  call: register_pkgdown_methods()
  error: rlang::is_installed(c("DiagrammeR", "DiagrammeRsvg")) is not TRUE

Showing that the build is failing when trying to render one of the vignettes. However, if I just try to knit this vignette in a fresh interactive session, it knits fine.

I have tried including DiagrammeR and DiagrammeRsvg in Depends, Imports, or Suggests, and it still fails with the same error.

Any idea what I can do to fix this? The vignette is located on my github here. I understand this is not the ideal way to share an example, but it can repro'd by cloning the repo and running pkgdown::build_site()

Answer 1

The error is fairly informative; it tells you that

rlang::is_installed(c("DiagrammeR", "DiagrammeRsvg"))

is not TRUE. I suspect if you run that line it will in fact return FALSE. I installed DiagrammeRsvg and the vignette built successfully.

I am not entirely sure why building the vignette with pkgdown requires SVG export of your diagrams, but knitting them doesn't. Hopefully that solves the issue, though.