[R-pkg-devel] Avoid reprocessing Rmd vignette

[Tim Keitt]

http://www.keittlab.org/

On Mon, Mar 19, 2018 at 6:41 AM, Dirk Eddelbuettel <edd at debian.org> wrote:

>
> On 18 March 2018 at 21:57, Tim Keitt wrote:
> | That's a great idea, however my problem is with building a vignette, not
> | running tests, unless they are linked in some way I'm not understanding.
>
> Similar idea applies: condition, just as Inaki and Thierry suggested.  An
> example for a conditional vignette evaluation is
>
> ```{r echo = FALSE, message = FALSE}`r ''`
> hasData <- requireNamespace("hurricaneexposuredata", quietly = TRUE)
>           #1
> if (!hasData) {
>          #2
>     knitr::opts_chunk$set(eval = FALSE)
>          #3
>     msg <- paste("Note: Examples in this vignette require that the",
>                  "`hurricaneexposuredata` package be installed. The
> system",
>                  "currently running this vignette does not have that
> package",
>                  "installed, so code examples will not be evaluated.")
>     msg <- paste(strwrap(msg), collapse="\n")
>     message(msg)
>           #4
> }
> ```
>

That's a great solution. I've used something similar eg
https://raw.githubusercontent.com/thk686/strider/master/vignettes/strider.Rmd

I'm still confused however as I was sure that my code chunks were run
during CRAN check even when the eval option was set to false. But its
sounding like I made the wrong assumption. Not sure why it did not work
before.

THK


>
> and the paper (https://journal.r-project.org/archive/2017/RJ-2017-026/) by
> Brooke Anderson and myself discusses #1 to #4.
>
> Dirk
>
> --
> http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
>

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