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#' knit engine
#'
#' You can include templates and their rendered output in an RMarkdown document.
#' This is achieved using the `jinjar` RMarkdown engine, which reads chunk options:
#'
#' * `data`: A named list of variables to pass to the template.
#' * `engine.opts`: A named list of engine options:
#' * `lang`: A string (e.g. `"sql"`, `"html"`) to specify the syntax
#' highlighting applied to the template and its rendered output.
#' * `config`: An engine configuration object (see [jinjar_config()]).
#' @noRd
knit_jinjar <- function(options) {
engine_output <- get("engine_output", envir = asNamespace("knitr"))
if (identical(.Platform$GUI, "RStudio") && is.character(options$data)) {
options$data <- get(options$data, envir = globalenv()) # nocov
}
code <- paste(options$code, collapse = "\n")
out <- if (options$eval) {
config <- options$engine.opts$config %||% default_config()
render(code, !!!options$data, .config = config)
} else ""
# override styling and syntax highlighting
lang <- options$engine.opts$lang
options$class.source <- c(options$class.source, lang, "bg-info")
options$class.output <- c(options$class.output, lang, "bg-success")
options$comment <- NULL
engine_output(options, code, out)
}
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