[ESS] run R code upon starting each ESS session

[Dirk Eddelbuettel]

On 3 October 2023 at 18:52, Manuel Teodoro via ESS-help wrote:
| Is there a way to run R code upon starting each ESS session?
| 
| Something like Rprofile but I'd like to make it more dependent to emacs.
| 
| What I want is to have a few options settings in my R sessions by default.
| Since I use it in different computers but my Emacs configuration is shared
| among all of them, I would prefer to keep this also within my emacs config.
| 
| It can be either calling an R script, specifying the path to Rprofile
| directly to ESS or passing a string of R code to run at startup.
| 
| Any ideas are appreciated

Cool question. My immediate thought (weighted by the fact that I cannot write
elisp code ;-) ) was to test for that in the _the standard R startup files_.
A quick check of what `Sys.getenv()` returns inside Emacs reveals the
`INSIDE_EMACS` env var so now I just added

    if (interactive() && nzchar(Sys.getenv("INSIDE_EMACS")))  {
        cat("Hello Emacs user.\n")
    }

to the bottom of .Rprofile and indeed:

  [... other stuff including the fortunes::fortune call output ...] 

  Hello Emacs user.
  > setwd('/home/edd/')
  > 

but not when I start R on the terminal.  That could be start for you.

Dirk

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