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#' Check if running R via radian (formerly known as rtichoke and rice)
#'
#' @return A logical
#'
#' @references
#' 1. radian - A 21 century R console (previously known as rtichoke and rice),
#' \url{https://github.com/randy3k/radian}
is_radian <- function() {
## radian (>= 0.3.0)
if (nzchar(Sys.getenv("RADIAN_VERSION"))) return(TRUE)
## rtichoke (< 0.3.0)
if (nzchar(Sys.getenv("RTICHOKE_VERSION"))) return(TRUE)
## rice (<= 0.1.1)
if (nzchar(Sys.getenv("RICE_VERSION"))) return(TRUE)
## rice (< 0.0.9)
tolower(basename(Sys.getenv("_"))) == "rice"
}
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