Check datasets in package with utf-8, latin1 or bytes characters

Here is a hack of tools:::.check_package_datasets() to show what dataset has utf-8, latin1 or bytes characters.
pkgDir must be the path of the package.



  check_package_datasets <- function (pkgDir) 
  {
    oLC_ct <- Sys.getlocale("LC_CTYPE")
    on.exit(Sys.setlocale("LC_CTYPE", oLC_ct))
    Sys.setlocale("LC_CTYPE", "C")
    oop <- options(warn = -1)
    on.exit(options(oop), add = TRUE)
    check_one <- function(x, ds) {
      if (!length(x)) 
        return()
      if (is.list(x)) 
        lapply(unclass(x), check_one, ds = ds)
      if (is.character(x)) {
        xx <- unclass(x)
        enc <- Encoding(xx)
        latin1 <<- latin1 + sum(enc == "latin1")
        utf8 <<- utf8 + sum(enc == "UTF-8")
        bytes <<- bytes + sum(enc == "bytes")
        unk <- xx[enc == "unknown"]
        ind <- .Call(tools:::C_check_nonASCII2, unk)
        if (length(ind)) {
          non_ASCII <<- c(non_ASCII, unk[ind])
          where <<- c(where, rep.int(ds, length(ind)))
        }
      }
      a <- attributes(x)
      if (!is.null(a)) {
        lapply(a, check_one, ds = ds)
        check_one(names(a), ds)
      }
      invisible()
    }
    sink(tempfile())
    on.exit(sink(), add = TRUE)
    files <- tools:::list_files_with_type(file.path(pkgDir, "data"), 
                                          "data")
    files <- unique(basename(tools:::file_path_sans_ext(files)))
    ans <- vector("list", length(files))
    dataEnv <- new.env(hash = TRUE)
    names(ans) <- files
    old <- setwd(pkgDir)
    point_try <- function(expr, msg) {
      oop <- options(warn = 1)
      on.exit(options(oop))
      outConn <- file(open = "w+")
      sink(outConn, type = "output")
      sink(outConn, type = "message")
      tryCatch(withRestarts(withCallingHandlers(expr, error = {
        function(e) invokeRestart("grmbl", e, sys.calls())
      }), grmbl = function(e, calls) {
        n <- length(sys.calls())
        calls <- calls[-seq.int(length.out = n - 1L)]
        calls <- rev(calls)[-c(1L, 2L)]
        tb <- lapply(calls, deparse)
        message(msg, conditionMessage(e), "\nCall sequence:\n", 
                paste(c(utils::head(.eval_with_capture(traceback(tb))$output, 
                                    5), "  ..."), collapse = "\n"), "\n")
      }), error = identity, finally = {
        sink(type = "message")
        sink(type = "output")
        close(outConn)
      })
    }
    for (f in files) {
      msg <- sprintf("Error loading dataset %s: ", sQuote(f))
      point_try(utils::data(list = f, package = character(), envir = dataEnv), 
                msg)
    }
    setwd(old)
    non_ASCII <- where <- character()
    latin1 <- utf8 <- bytes <- 0L
    closeAllConnections()
    preutf8 <- 0
    prelatin1 <- 0
    prebytes <- 0
    for (ds in ls(envir = dataEnv, all.names = TRUE)) {
      
      if (inherits(suppressWarnings(suppressMessages(try(check_one(get(ds, 
                                                                       envir = dataEnv), ds), silent = TRUE))), "try-error")) {
        msg <- sprintf("Error loading dataset %s:\n ", sQuote(ds))
        message(msg, geterrmessage())
      }
      if (utf8-preutf8 != 0) print(paste0(ds, "  ", utf8-preutf8, " utf-8"))
      if (latin1-prelatin1 != 0) print(paste0(ds, "  ", latin1-prelatin1, " latin1"))
      if (bytes-prebytes != 0) print(paste0(ds, "  ", bytes-prebytes, " bytes"))
      preutf8 <- utf8
      prelatin1 <- latin1
      prebytes <- bytes
    }
    unknown <- unique(cbind(non_ASCII, where))
    structure(list(latin1 = latin1, utf8 = utf8, bytes = bytes, 
                   unknown = unknown), class = "check_package_datasets")
  }
  
  

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