Get the path of current script

I would like to set the working directory to the path of current script programmatically but first I need to get the path of current script.

So I would like to be able to do:

current_path = ...retrieve the path of current script ...
setwd(current_path) 

Just like the RStudio menu does:

So far I tried:

initial.options <- commandArgs(trailingOnly = FALSE)
file.arg.name <- "--file="
script.name <- sub(file.arg.name, "", initial.options[grep(file.arg.name, initial.options)])
script.basename <- dirname(script.name)

script.name returns NULL

source("script.R", chdir = TRUE)

Returns: Error in file(filename, "r", encoding = encoding) : cannot open the connection In addition: Warning message: In file(filename, "r", encoding = encoding) : cannot open file '/script.R': No such file or directory

dirname(parent.frame(2)$ofile)

Returns: Error in dirname(parent.frame(2)$ofile) : a character vector argument expected ...because parent.frame is null

frame_files <- lapply(sys.frames(), function(x) x$ofile)
frame_files <- Filter(Negate(is.null), frame_files)
PATH <- dirname(frame_files[[length(frame_files)]])

Returns: Null because frame_files is a list of 0

thisFile <- function() {
    cmdArgs <- commandArgs(trailingOnly = FALSE)
    needle <- "--file="
    match <- grep(needle, cmdArgs)
    if (length(match) > 0) {
        # Rscript
        return(normalizePath(sub(needle, "", cmdArgs[match])))
    } else {
        # 'source'd via R console
        return(normalizePath(sys.frames()[[1]]$ofile))
    }
}

Returns: Error in path.expand(path) : invalid 'path' argument

Also I saw all answers from here, here, here and here. No joy.

Working with RStudio 1.1.383

EDIT: It would be great if there was no need for an external library to achieve this.