[R-pkg-devel] Example fails in check

[Duncan Murdoch]

On 26/07/2019 2:37 a.m., Sigbert Klinke wrote:
> Hi,
> 
> im my package development I get the following error when checking an
> example:
> 
>   > m <- findMatch('test', x[[1]], FUN='leven(code)') %>% addWave(x[[2]])
> 
>     Error in findMatch("test", x[[1]], FUN = "leven(code)") %>%
> addWave(x[[2]]) :
>       could not find function "%>%"
>     Execution halted
> 
> In my DESCRIPTION file I wrote
> 
> Imports:
>     rio,
>     stringi,
>     magrittr
> 
> So, I expected that magrittr is loaded when the example is executed.

Loaded doesn't mean it is on the search list.  To get that you need 
library(magrittr), or require(magrittr).

Examples can't see things that are internal to the package.  Importing a 
package only makes it available internally.   If you want it visible 
externally (as it needs to be in an example), you need to export it.

So if you want users of your package to have access to magrittr pipes, 
you should put something like this in your NAMESPACE file, as well as 
the declaration in your DESCRIPTION file:

importFrom(magrittr, "%>%")
export("%>%")

Duncan Murdoch




> 
> If I add an "library(magrittr)" at the beginning of the example then the
> example is okay.
> 
> Any ideas what goes wrong?
> 
> Sigbert
>