Error while building a ggplot2 extension. Could not find function ggproto

Question

I try to build a custom geom to extend ggplot2.

While the function works, I am not able to build the package as I have the following error message:

    ==> devtools::document(roclets=c('rd', 'collate', 'namespace'))

    Updating ggvis documentation
Loading ggvis
    Error in ggproto("GeomDash", Geom, required_aes = c("x", "y"), non_missing_aes = c("linetype",  (from geom_dash.R#57) : 
impossible de trouver la fonction "ggproto"
    Calls: suppressPackageStartupMessages ... withr_with_dir -> force -> source_many -> source_one -> eval -> eval
Ex�cution arr�t�e

Exited with status 1.

I installed the dev version of ggplot2 as recommanded by Hadley. With no success. For some reason it does not show an error when I try with a dummy function such as:

    f <- function(x){
        return(ggproto(x))}

But it doesn't work even with the initial code of geom_segment or by integrating the ggproto function in the package's folder.

You can find my function here

I've already created a package to extend ggplot2 with no problem. It still builds just fine.

Any suggestion? Cheers.

You need to update you NAMESPACE file (or have Roxygen update it for you). If you look at the NAMESPACE of your problem package, it only has a single line, and it's an export line--no namespaces are imported. Compare this to the NAMESPACE of your working package, which has lines to import() each of the packages mentioned as Imports in your DESCRIPTION file. — Gregor Thomas
I fill have a look. Isn't Roxygen supposed to create the NAMESPACE file according to the DESCRIPTION file ? — Hobo Sheep
Especially if the geom_function contains the following lines: #' @import ggplot2 grid #' @importFrom ggplot2 ggproto — Hobo Sheep

Hobo Sheep Hobo Sheep · Accepted Answer · 2018-07-18T07:35:03

The problem was solved by editing the NAMESPACE as suggested by @Gregor.

Removing the existing NAMESPACE file and running

    devtools::document()

allowed the creation of a clean NAMESPACE file containing the required exports and imports.

Error while building a ggplot2 extension. Could not find function ggproto

1 Answers