[Rd] Fwd: Using existing envars in Renviron on friendly Windows

[Tomas Kalibera]

On 10/15/21 6:44 PM, Michał Bojanowski wrote:
> Perhaps a small update to ?.Renviron would be in order to mention that...

Would you have a more specific suggestion how to update the 
documentation? Please note that it already says

"‘value’ is then processed in a similar way to a Unix shell: in 
particular the outermost level of (single or double) quotes is stripped, 
and backslashes are removed except inside quotes."

Thanks,
Tomas

> On Fri, Oct 15, 2021 at 6:43 PM Michał Bojanowski <michal2992 using gmail.com> wrote:
>> Indeed quoting works! Kevin suggested the same, but he didnt reply to the list.
>> Thank you all!
>> Michal
>>
>> On Fri, Oct 15, 2021 at 6:40 PM Ivan Krylov <krylov.r00t using gmail.com> wrote:
>>> Sorry for the noise! I wasn't supposed to send my previous message.
>>>
>>> On Fri, 15 Oct 2021 16:44:28 +0200
>>> Michał Bojanowski <michal2992 using gmail.com> wrote:
>>>
>>>> AVAR=${APPDATA}/foo/bar
>>>>
>>>> Which is a documented way of referring to existing environment
>>>> variables. Now, with that in R I'm getting:
>>>>
>>>> Sys.getenv("APPDATA")    # That works OK
>>>> [1] "C:\\Users\\mbojanowski\\AppData\\Roaming"
>>>>
>>>> so OK, but:
>>>>
>>>> Sys.getenv("AVAR")
>>>> [1] "C:UsersmbojanowskiAppDataRoaming/foo/bar"
>>> Hmm, a function called by readRenviron does seem to remove backslashes,
>>> but not if they are encountered inside quotes:
>>>
>>> https://github.com/r-devel/r-svn/blob/3f8b75857fb1397f9f3ceab6c75554e1a5386adc/src/main/Renviron.c#L149
>>>
>>> Would AVAR="${APPDATA}"/foo/bar work?
>>>
>>> --
>>> Best regards,
>>> Ivan
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