[R] detecting the sourcing of site profile on Startup versus post-Startup

Jeff Newmiller jdnewmil at dcn.davis.CA.us
Thu Apr 24 03:31:33 CEST 2014

Regardless of whether this is possible, it seems like a bad idea (side effects in a functional programming environment). If you want to do something special in startup then write a different function that does that stuff and then call the desired functions explicitly when you want them to be called.
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Sent from my phone. Please excuse my brevity.

On April 23, 2014 6:11:09 PM PDT, Benjamin Tyner <btyner at gmail.com> wrote:
> Thanks  Duncan!  Yes, I considered taking advantage of .First, but was
>concerned that the .First defined by the site profile could be masked
>by a
>possible .First defined by the user profile (I neglected to mention
> "--no-init-profile"  [sic]  in  the  example  I gave was a simplifying
>   assumption, sorry about that).
>   On 04/23/2014 06:55 AM, Duncan Murdoch wrote:
>     On 22/04/2014, 8:59 PM, Benjamin Tyner wrote:
>     Greetings,
> Is there any way to programmatically detect whether a piece of code is
>   being run within the initial (Startup) sourcing of the site profile?
>   For example, say I have a site profile, "/path/to/Rprofile.site". Is
>   there any function "my_func" which would return different values for
>     these two instances:
>         Rscript --no-site-profile --no-init-profile -e
>    "sys.source('/path/to/Rprofile.site',  envir  = .BaseNamespaceEnv);
>     my_func()"
>     versus:
>         export R_PROFILE=/path/to/Rprofile.site
>         Rscript --no-init-profile -e "my_func()"
>The commandArgs() function could see the different command lines and
>     function could deduce the difference from that.
>As far as I know, R keeps no other records of the startup process, but
>you can modify other files, you could leave a record when .First was
>    and see that it was run before Rprofile.site in the first case. See
>     ?Startup.
>     Duncan Murdoch
>   --
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>and provide commented, minimal, self-contained, reproducible code.

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