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#' #' Verify minimum pandoc version
#' #'
#' #' Verifies that pandoc version 2.0 or later is available.
#' #'
#' #' @param report Character. In case pandoc version is < 2.0 errors if
#' #' \code{error}, warns if \code{warn}, or remains silent otherwise.
#' #'
#' #' @return Logical. \code{TRUE} if pandoc version is 2.0 or later, \code{FALSE}
#' #' otherwise.
#' #' @export
#' #'
#' #' @examples
#' #'
#' #' verify_pandoc_version(report = "silent")
#'
#' verify_pandoc_version <- function(report = "error") {
#' assertthat::assert_that(length(report) == 1)
#' assertthat::assert_that(is.character(report))
#'
#' lua_available <- utils::compareVersion("2.0", as.character(rmarkdown::pandoc_version())) <= 0
#'
#' report_fun <- switch(
#' report
#' , "error" = stop
#' , "warn" = function(x) { warning(x); return(FALSE) }
#' , function(x) return(FALSE)
#' )
#'
#' if(!lua_available) {
#' report_fun("Lua filters require pandoc 2.0 or later (https://pandoc.org/).")
#' }
#'
#' lua_available
#' }
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