[Rd] FR: improve "use" function

[Roland Fuß]

Hello,

Currently `use` fails silently if you try to attach functions from the 
same namespace. It would be nice and more similiar to the use of 
roxygen2 if it could add (and maybe even remove?) functions. Here is a 
simple proof of concept I have posted on Stack Overflow [1]. Something 
similar could be done within `use`. Of course, it would be preferable if 
it didn't need to detach the namespace.

|use("data.table", "fread") ls("package:data.table") #[1] "fread" 
use("data.table", "nafill") ls("package:data.table") #[1] "fread" 
useplus <- function(package, include.only) { loaded <- 
ls(sprintf("package:%s", package), all.names = TRUE) 
unloadNamespace(package) if (missing(include.only)) { use(package) } 
else { use(package, union(loaded, include.only)) } } 
useplus("data.table", "nafill") ls("package:data.table") #[1] "fread" 
"nafill"|


[1] https://stackoverflow.com/q/79633064/1412059

-- 
Dr. Roland Fuß

Thünen-Institut für Agrarklimaschutz/
Thünen Institute of Climate-Smart Agriculture

Bundesallee 65
D-38116 Braunschweig, Germany

Tel./Webex: ++49 531 25701967
Email: roland.fuss using thuenen.de

Arbeitsgruppe "Emissionsberichterstattung"/
Working group "Emission Inventories"
Email: emissionsinventare using thuenen.de