Feature Request: Allow passing a multi-line string of packages to pak::pak()

[SermetPekin]

Hi @gaborcsardi

I was thinking it would be super handy if pak::pak() could also accept a plain multi-line string (in addition to a character vector with lots of quotes and commas). It makes copy-pasting and managing large lists of dependencies much easier.

Ideally, the function would ignore blank lines, trim spaces, and let us use # to comment out specific packages.

Here's a quick helper function I wrote to show what I mean:

parse_packages <- function(text) {
  pkgs <- unlist(strsplit(text, "\n"))
  pkgs <- trimws(pkgs)
  pkgs <- pkgs[!grepl("^#", pkgs)]
  pkgs <- pkgs[pkgs != ""]
  return(pkgs)
}

Usage:

pak::pak(parse_packages("
# ...........................................
# Requirements 
# ...........................................
  dplyr
  lme4
  # ggplot2
  tidyverse/tibble
  
"))

Would it make sense to support this natively in pak(), or include a small helper function like this to do the heavy lifting?