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#' @title Download circus models
#' @name download_model
#'
#' @description Downloads pre-compiled models from the *circus*-repository.
#' The *circus*-repository contains a variety of fitted models to help
#' the systematic testing of other packages
#'
#' @param name Model name.
#' @param url String with the URL from where to download the model data.
#' Optional, and should only be used in case the repository-URL is
#' changing. By default, models are downloaded from
#' `https://raw.github.com/easystats/circus/master/data/`.
#'
#' @return A model from the *circus*-repository, or `NULL` if model could
#' not be downloaded (e.g., due to server problems).
#'
#' @details The code that generated the model is available at the
#' <https://easystats.github.io/circus/reference/index.html>.
#'
#' @references <https://easystats.github.io/circus/>
#'
#' @export
download_model <- function(name, url = NULL) {
.download_data_github(name, url)
}
# Download rda files from github
.download_data_github <- function(name, url) {
check_if_installed("httr", "to download models from the circus-repo")
if (is.null(url)) {
url <- "https://raw.github.com/easystats/circus/master/data/"
}
url <- paste0(url, name, ".rda")
temp_file <- tempfile()
on.exit(unlink(temp_file))
result <- tryCatch(
{
request <- httr::GET(url)
httr::stop_for_status(request)
},
error = function(e) {
format_alert(
"Could not download model. Request failed with following error:",
e$message
)
NULL
}
)
if (is.null(result)) {
return(NULL)
}
writeBin(httr::content(request, type = "raw"), temp_file)
x <- load(temp_file)
model <- get(x)
rm(x)
model
}
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