Convert a PDF file to text.

Takes a path to a PDF file and returns its text content as a single character string, extracted with the poppler `pdftotext` utility (the same extractor the original `oddpub` package relied on, implemented here as a standard system call). Different extractors format text differently; the detectors in this package were tuned to the layout `pdftotext` produces. To analyze the result with the plain-text detectors, write it to a `.txt` file first (see Examples).

Usage

rt_read_pdf(filepath)

Arguments

filepath

The path to the PDF file as a string (must end in `.pdf`).

Value

A character string with the extracted text.

Examples

if (FALSE) { # \dontrun{
# Path to a PDF file.
pdf_path <- system.file(
  "extdata", "PMID32171256-PMC7071725.pdf", package = "rtransparency"
)

# Extract the text, write it to a TXT file, then run the detectors.
article_txt <- rt_read_pdf(pdf_path)
writeLines(article_txt, "article.txt")
rt_coi("article.txt")
} # }