I case someone runs into this topic. I just found the following
comment from 2012 on BugZilla explaining why Sys.setlocale() does
*not* return invisibly contrary to most++ other setters in R:
PR#15128: Sys.setlocale() - return previous setting invisibly?
Brian Ripley on 2012-12-09 16:53:43 UTC:
> It was a deliberate decision. Unlike options() the locale is usually set at
> startup and it is major thing to change it in a session--and it is usually
> only done recording the previous value to return to. The author certainly
> wanted to see what he was changing from in a session.
https://bugs.r-project.org/bugzilla/show_bug.cgi?id=15128#c1
/Henrik
On Tue, Mar 20, 2018 at 2:11 PM Henrik Bengtsson
wrote:
>
> Contrary to, say, Sys.setenv(), Sys.setlocale() returns it's value
> visibly. This means that if you for instance add:
>
> Sys.setlocale("LC_COLLATE", "C")
>
> to your .Rprofile file, it will print:
>
> [1] "C"
>
> at startup. The workaround is to wrap the call in invisible(), but I'd
> argue that any "setter" function should return invisibly.
>
> Some more details:
>
> > withVisible(Sys.setlocale("LC_COLLATE", "C"))
> $value
> [1] "C"
>
> $visible
> [1] TRUE
>
> > withVisible(Sys.setenv(FOO = "C"))
> $value
> [1] TRUE
>
> $visible
> [1] FALSE
>
> /Henrik
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