Personal R settings file.

.Rprofile

# rstan::rstan_options(auto_write = TRUE)
if (Sys.info()["sysname"] == "Windows"){
	# For improved execution time, we recommend calling
	Sys.setenv(LOCAL_CPPFLAGS = '-march=corei7 -mtune=corei7')
}

# don't ask to save workspace on quit; `q()`
# utils::assignInNamespace(
#   "q", 
#   function(save = "no", status = 0, runLast = TRUE) 
#   {
#     .Internal(quit(save, status, runLast))
#   }, 
#   "base"
# )

# speed up package installation
# as per https://www.jumpingrivers.com/blog/speeding-up-package-installation/
if (requireNamespace("parallel", quietly = TRUE)) {
  options(Ncpus = as.integer(ceiling(0.75*parallel::detectCores())))
  options(mc.cores = parallel::detectCores())
}

# Use binary packages on Ubuntu 20.04 from RStudio Package Manager
# URL from https://packagemanager.rstudio.com/client/#/repos/1/overview
# Additionally make change in Rprofile.site file which is in ${R_HOME}/etc
# Find ${R_HOME} with R.home(component = "home") or Sys.getenv("R_HOME")
local({
  if (Sys.info()["sysname"] == "Linux") {
    r <- getOption("repos")
   #  r["CRAN"] <- "https://packagemanager.rstudio.com/all/__linux__/focal/latest"
   r["CRAN"] <- "https://packagemanager.posit.co/cran/__linux__/focal/latest"
    options(repos = r)
  }

  # Running R in Terminal requires amending the HTTPUserAgent
  # https://tshafer.com/blog/2023/07/posit-package-manager-linux
  if (Sys.getenv('RSTUDIO') != 1L) {
    options(HTTPUserAgent = sprintf(
      "R/%s R (%s)",
      getRversion(),
      paste(
        getRversion(),
        R.version["platform"],
        R.version["arch"],
        R.version["os"]
      )
    ))
  }
})