# Getting PDFs from pre-print servers

## Just get some PDFs

In this vignette we go through the process of getting some PDFs. First we need to set-up a tibble of papers that we are interested in.

    library(heapsofpapers)

    two_pdfs <-
      tibble::tibble(
        locations_are = c("https://osf.io/preprints/socarxiv/z4qg9/download",
                          "https://osf.io/preprints/socarxiv/a29h8/download"),
        save_here = c("competing_effects_on_the_average_age_of_infant_death.pdf",
                      "cesr_an_r_package_for_the_canadian_election_study.pdf")
      )

Now we want to download those PDFs (this will just download them into the current working directory).

    heapsofpapers::get_and_save(
      data = two_pdfs,
      links = "locations_are",
      save_names = "save_here"
    )

## Get some PDFs and save them in a particular folder

Now it may be useful to have the PDFs saved into a specific folder. So this time make a folder ‘inputs’ in the current working directory. Those same PDFs will now be saved into that folder.

    heapsofpapers::get_and_save(
      data = two_pdfs,
      links = "locations_are",
      save_names = "save_here",
      dir = "inputs"
    )

## Check which PDFs already exist in a particular folder

Now we can check which of these we have.

    heapsofpapers::check_for_existence(data = two_pdfs,
                                       save_names = "save_here",
                                       dir = "inputs")