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#' @name getTeamIDs
#'
#' @title Retrieve team IDs for event files
#'
#' @description This function retrieves the team ID needed for the
#' \code{team} argument of \code{getRetrosheet("play", year, team)}.
#'
#' @param year A single valid four-digit numeric year.
#'
#' @return If the file exists, a named vector of IDs for the given year.
#' Otherwise \code{NA}.
#'
#' @details All currently available years can be retrieved with
#' \code{type.convert(substr(getFileNames()$event, 1L, 4L))}
#'
#' @importFrom httr http_error write_disk RETRY timeout
#' @export
#'
#' @examples \donttest{
#' getTeamIDs(2010)
#' }
#'
getTeamIDs <- function(year) {
stopifnot(is.numeric(year), length(year) == 1L)
path <- sprintf("https://www.retrosheet.org/events/%deve.zip", year)
if (!http_error(path)) {
tmp <- tempfile()
on.exit(unlink(tmp))
RETRY("GET", url = path, write_disk(tmp, overwrite=TRUE), timeout(15))
} else {
available <- grep(year, getFileNames()$event)
if(!length(available)) {
return(NA)
}
}
fname <- paste0("TEAM", year)
unzip(tmp, files = fname)
on.exit(unlink(fname), add = TRUE)
read <- suppressWarnings(read.csv(fname, header = FALSE, stringsAsFactors = FALSE))[c(1, 4)]
out <- structure(read[[1L]], .Names = read[[2L]])
out
}
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