[R-pkg-devel] Having shiny as an optional dependency

I did briefly wonder why your reply to me cited an email from Akshit Achara
who asked about third party C++ API. I assumed it was because the solution
to his problem and mine was the same.

In the meantime, I got a reply from Kurt Hornik who said I have a top-level
call

soundcorrsGUI <- shiny::shinyApp (ui, server)

so what I should really do is to move "shiny" from "Suggests" to "Imports".
I don't want to do this, however, because the GUI is just an addition, the
package is perfectly usable without it. I wrapped "soundcorrsGUI" in a
function:

soundcorrsGUI <- function () {

if (!requireNamespace("shiny",quietly=T) ||
!requireNamespace("shinyjqui",quietly=T))
stop ("\"soundcorrsGUI\" requires packages \"shiny\" and \"shinyjqui\".")

shiny::shinyApp (ui, server)

}

and this seems to solve the problem with "shiny", but now I have a problem
with "shinyjqui". I actually only need one function from it: in the call to
"shinyApp" above,

ui <- shiny::navbarPage ([?] ui.soundchanges [?])

where

ui.soundchanges <- shiny::fluidPage ([?]

shinyjqui::sortableCheckboxGroupInput [?])

I tried wrapping "ui.soundchanges" in a function in the same way as I did
with "soundcorrsGUI" but this doesn't help.

Is there a way to make it work without turning "shiny" and "shinyjqui" into
obligatory dependencies?

Best wishes,
Kamil Stachowski

On Mon, 16 Nov 2020, 00:55 Uwe Ligges, <ligges at statistik.tu-dortmund.de>
wrote:

On 14.11.2020 19:53, Kamil Stachowski wrote:

This is actually what I do. Before you replied, I was told to write to

CRAN

and explain, and they will decide whether the packages will be installed

on

CRAN machines. Thank you for your help nonetheless.

No, I told you about a "third party C++ API" you asked for, not about an
R package. R packages  from BioC + CRAN should be availabe on CRAN, in
that case it is a problem in your package.

Best,
Uwe Ligges

Best,
Kamil

On Sat, 14 Nov 2020 at 19:39, G?bor Cs?rdi <csardi.gabor at gmail.com>

wrote:

You probably import functions from shiny. Don't do that, refer to them
with the `::` operator instead.

Gabor

On Sat, Nov 14, 2020 at 6:12 PM Kamil Stachowski
<kamil.stachowski at gmail.com> wrote:

I wrote a package that contains a graphical interface written with

packages

"shiny" and "shinyjqui". My package can also be used from the CLI, so I
listed both "shiny" and "shinyjqui" as optional dependencies. I ran R

CMD

check --as-cran on my computer in R 3.6.3 and devel, and both passed
without any errors or warnings. However, when I tried uploading the

package

to CRAN, I got this error:

Error in loadNamespace(x) : there is no package called ?shiny?
Error: unable to load R code in package ?soundcorrs?
Execution halted
ERROR: lazy loading failed for package ?soundcorrs?

How can I fix this?

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