R/utils-io.R

In roxygen2: In-Line Documentation for R

readLines <- function(...) cli::cli_abort("Use read_lines!", .internal = TRUE)
writeLines <- function(...) cli::cli_abort("Use write_lines!", .internal = TRUE)

read_lines <- function(path, n = -1L) {
  base::readLines(path, n = n, encoding = "UTF-8", warn = FALSE)
}

write_lines <- function(text, path, line_ending = detect_line_ending(path)) {
  # we need to convert any embedded newlines as well
  text <- gsub("\r?\n", line_ending, text)

  path <- file(path, open = "wb")
  base::writeLines(enc2utf8(text), path, sep = line_ending, useBytes = TRUE)
  close(path)
}

detect_line_ending <- function(path) {
  tryCatch(
    {
      samp <- suppressWarnings(readChar(path, nchars = 500))
      if (isTRUE(grepl("\r\n", samp))) "\r\n" else "\n"
    },
    error = function(e) "\n"
  )
}