Nothing
output_format = function(to = 'html') {
to
function(
meta = NULL, template = NULL, options = NULL, keep_md = FALSE,
keep_tex = FALSE, latex_engine = 'xelatex'
) {
opts = rmarkdown::pandoc_options(
to = to, keep_tex = keep_tex, latex_engine = latex_engine, args = '--template'
)
opts$convert_fun = function(input, output, ...) {
mark(input, output, NULL, to, options, template, meta)
}
rmarkdown::output_format(
NULL, opts, keep_md = keep_md,
pre_processor = function(meta, input, runtime, knit_meta, ...) {
# knitr::knit_meta() has been emptied at this stage and only available
# in the `knit_meta` argument; make a copy in .env so that it can be
# accessed in add_html_deps() later
.env$knit_meta = knit_meta; NULL
},
on_exit = function() .env$knit_meta = NULL,
clean_supporting = 'local' %in% normalize_options(options)[['embed_resources']]
)
}
}
#' R Markdown output formats
#'
#' Convenience functions for R Markdown v2 users.
#'
#' We refer to this \pkg{markdown} package plus \pkg{knitr} as \dQuote{R
#' Markdown v1}, and the \pkg{rmarkdown} package as \dQuote{R Markdown v2}. The
#' former uses \pkg{commonmark} to convert Markdown, and the latter uses Pandoc.
#' However, the latter also accept custom converting tools in addition to
#' Pandoc. The output formats here provide the custom converting function
#' [mark()] to \pkg{rmarkdown}, so that users can take advantage of
#' [rmarkdown::render()] and the Knit button in RStudio. It is absolutely not
#' necessary to rely on \pkg{rmarkdown}. The only point is convenience. If you
#' do not use `rmarkdown::render()` or the Knit button, you can definitely just
#' call `markdown::mark()` directly.
#' @param meta,template,options Arguments to be passed to [mark()].
#' @param keep_md,keep_tex Whether to keep the intermediate \file{.md} and
#' \file{.tex} files generated from \file{.Rmd}.
#' @param latex_engine The LaTeX engine to compile \file{.tex} to \file{.pdf}.
#' This argument and `keep_tex` are for `latex_format()` only, and ignored in
#' `html_format()`.
#' @export
html_format = output_format('html')
#' @rdname html_format
#' @export
latex_format = output_format('latex')
# get metadata from a certain field under an output format
yaml_field = function(yaml, format, name = 'meta') {
if (is.list(out <- yaml[['output']]) &&
is.list(out <- out[[sprintf('markdown::%s_format', format)]]))
out[[name]]
}
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