Provides functions to retrieve the location of R scripts loaded
through the source
function or run from the command line
using the Rscript
command. This functionality is analogous
to the Bash shell’s ${BASH_SOURCE[0]}. Users can first set the project
root’s path relative to the script path and then all subsequent paths
relative to the root. This system ensures that all paths lead to the
same location regardless of where any script is executed/loaded from
without resorting to the use of setwd
at the top of the
scripts.