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#' A simple function to turn named arguments into a form-encoded string
#' @export
#' @param \dots arbitrary named arguments that will become part of a form-encoded url.
#' @param a something
#' @details This function is called in every BigML API function. It helps
#' build the URL that requests are forwarded to. It automatically adds any
#' default user and api key settings specified by
#' \code{\link{setCredentials}}. However, it also can be used to access
#' advanced options that are otherwise undocumented here. For instance, it's
#' possible to filter and/or sort on a number of different api requests,
#' using a number of different fields (e.g., see the documentation on
#' \href{https://bigml.com/developers/datasets#d_list}{listing and sorting
#' datasets}.)
#' Other usage includes specifying \code{username} and \code{api_key}
#' for individual API requests; or \code{limit} or \code{offset} parameters
#' useful for paging through list requests. Finally, it's possible to
#' enable a simple debug mode by passing debug=TRUE. This will print the
#' url request string to the screen, along with any posted json objects.
#' @return form-encoded string result
#' @template author
#' @examples
#' \dontrun{
#' formEncodeURL(username="user1", api_key="test", limit=100, debug=TRUE)
#' # "?username=user1&api_key=test&limit=100&debug=TRUE"
#' }
formEncodeURL <-
function (a,...)
{
opt_args = list(...)
sys_user = Sys.getenv("BIGML_USERNAME")
sys_key = Sys.getenv("BIGML_API_KEY")
if (!"username" %in% opt_args && sys_user != ''){
opt_args$username = sys_user
}
if (!"api_key" %in% opt_args && sys_key != ''){
opt_args$api_key = sys_key
}
res = ""
for (v in names(opt_args)) {
encoded = curlPercentEncode(opt_args[v])
res = paste(res, v, "=", encoded, "&", sep = "")
}
if (nchar(res) <= 0){
return('')
} else{
res = strtrim(res, nchar(res) - 1)
return(paste("?", res, sep = ""))
}
}
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