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#' Tachyons
#'
#' Tachyons is a collection of CSS utility classes that works beautifully with
#' \pkg{xaringan} presentations using the `remarkjs`` class syntax.
#'
#' @section Usage: To add tachyons to your xaringan presentation, add the
#' following code chunk to your slides' R Markdown file.
#'
#' ````markdown
#' ```{r xaringan-tachyons, echo=FALSE}
#' xaringanExtra::use_tachyons()
#' ```
#' ````
#'
#' Tachyons provides small, single-purpose CSS classes that are easily composed
#' to achieve larger functionality and styles. In the [remarkjs content classes
#' syntax](https://github.com/gnab/remark/wiki/Markdown#content-classes), you
#' can compose classes by chaining them together. For example, the following
#' markdown produces a box with a washed green background (`.bg-washed-green`),
#' a dark green border (`.b--dark-green`) on all sides (`.ba`) with line width
#' 2 (`.bw2`) and border radius (`.br3`). The box has a shadow (`.shadow-5`)
#' and medium-large horizontal padding (`.ph4`) with a large top margin
#' (`.mt5`).
#'
#' ```markdown
#' .bg-washed-green.b--dark-green.ba.bw2.br3.shadow-5.ph4.mt5[
#' The only way to write good code is to write tons of bad code first.
#' Feeling shame about bad code stops you from getting to good code
#'
#' .tr[
#' — Hadley Wickham
#' ]]
#' ```
#' @examples
#' use_tachyons()
#'
#' @references [tachyons](http://tachyons.io/),
#' [Tachyons Cheat Sheet](https://roperzh.github.io/tachyons-cheatsheet/)
#' @return An `htmltools::tagList()` with the tachyons dependencies, or an
#' [htmltools::htmlDependency()].
#' @name tachyons
NULL
#' @describeIn tachyons Adds tachyons to your xaringan slides.
#' @param minified Use the minified Tachyons css file? Default is `TRUE`.
#' @export
use_tachyons <- function(minified = TRUE) {
htmltools::tagList(
html_dependency_tachyons(minified)
)
}
#' @describeIn tachyons Returns an [htmltools::htmlDependency()] with the tile
#' view dependencies. Most users will want to use `use_tachyons()`.
#' @export
html_dependency_tachyons <- function(minified = TRUE) {
tachyons_version <- "4.12.0"
htmltools::htmlDependency(
name = "tachyons",
version = tachyons_version,
package = "xaringanExtra",
src = "jslib/tachyons",
stylesheet = paste0("tachyons", if (minified) ".min", ".css"),
all_files = FALSE
)
}
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