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posit-dev / ark

Ark, an R kernel
MIT License
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Expose environment variables from R process #507

Closed juliasilge closed 3 weeks ago

juliasilge commented 3 weeks ago

Addresses https://github.com/posit-dev/positron/issues/2723

With this new function (callable via call_method() in Positron) we can get the values for a set of environment variables starting with a given regex from the R process:

.ps.rpc.get_env_vars("POSITRON")
#> $POSITRON
#> [1] "1"
#> 
#> $POSITRON_VERSION
#> [1] "2024.09.0"

If you need more than one set, you can do something like .ps.rpc.get_env_vars("POSITRON|VSCODE").

juliasilge commented 3 weeks ago

@jmcphers also thought that a regex was a bad idea and we should do the work of passing specific env vars by name. This tiny new helper now works like this:

.ps.rpc.get_env_vars(c("USER", "POSITRON", "POTATO"))
$USER
[1] "juliasilge"

$POSITRON
[1] "1"

$POTATO
[1] ""

So basically an unfancy and tiny wrapper around Sys.getenv().

juliasilge commented 3 weeks ago

I opened this issue to track a push-based model when the need becomes more urgent: https://github.com/posit-dev/positron/issues/4641