[R-pkg-devel] Avoid reprocessing Rmd vignette

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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