Check CRAN Results

cran-check.R

# started with `foghorn`, but that comes with dependencies and
# slows down R startup.  `browseURL` just barely slows startup, 
# even if actual page is slow to load.

check_cran_old <- function(email) {
  utils::browseURL(
    sprintf(
      "https://cran.r-project.org/web/checks/check_results_%s.html",
      gsub("[^A-Za-z0-9_:.-]", "_", sub("@", "_at_", email))
) ) }
if(interactive()) check_cran_old("john.doe@gmail.com")

# an alternative that is not as disruptive as `browserURL`.
# The regex is likely to be pretty fragile to changes in
# page structure, but the benefit is no dependencies:

check_cran <- function(
  email, cache='~/.R-cran-status.RDS', cache.life=24 * 3600
) {
  url <- sprintf(
    "https://cran.r-project.org/web/checks/check_results_%s.html",
    gsub("[^A-Za-z0-9_:.-]", "_", sub("@", "_at_", email))
  )
  display_check <- function(x, extra=NULL) {
    print(x)
    err.cols <- unlist(x[names(x) %in% c("WARNING", "ERROR")])
    if(sum(as.numeric(err.cols), na.rm=TRUE))
      writeLines(c("\033[41mErrors/Warnings Present\033[m", url))
    writeLines(c(extra, ""))
  }
  renew.cache <- TRUE
  if(file.exists(cache)) {
    cache.dat <- readRDS(cache)
    cache.age <- Sys.time() - cache.dat[[1]]
    if(as.double(cache.age, 'secs') < cache.life) {
      renew.cache <- FALSE
      display_check(
        cache.dat[[2]],
        c("",
          sprintf(
            "cached CRAN status (%s old).", format(round(cache.age))
  ) ) ) } }
  if(renew.cache) {
    cat("connecting to CRAN...")
    page <- readLines(url)
    cat("\r                     \r")
    pattern <- "\\s*<t[hd].*?>(.*?)</t[hd]>"
    has.rows <- grep(pattern, page, perl=TRUE)
    strings <- gregexpr(pattern, page[has.rows], perl=TRUE)
    res <- sapply(
      regmatches(page[has.rows], strings),
      function(x) {
        submatch <- regexec(pattern, x, perl=TRUE)
        vapply(regmatches(x, submatch), "[[", character(1L), 2)
      }
    )
    res.mx <- t(gsub("<[^>]*>|^\\s+|\\s+$", "", res))
    res.mx.2 <- res.mx[-1, ]
    colnames(res.mx.2) <- res.mx[1, ]
    res.df <- as.data.frame(res.mx.2, stringsAsFactors=FALSE)
    saveRDS(list(Sys.time(), res.df), cache)
    display_check(res.df)
  }
}
if(interactive()) check_cran('j.doe@gmail.com')

It works, reporting the values as your screenshot on Twitter did, but I get this error on start.

Error in display_check(cache.dat[[2]], c("", sprintf("cached CRAN status (%s old).", : (list) object cannot be coerced to type 'double'

You must have Errors/Warnings on CRAN! I did not have them when I wrote this, so that branch of the code was not properly tested. I just fixed it. Let me know if it still doesn't work for you. (@adamhsparks; not sure how notifications work on gist).

Thanks for helping test this.