Add css_file arg to theme_xaringan_inverse()

R/ggplot2.R

   background_color = NULL,
   accent_color = NULL,
   accent_secondary_color = NULL,
+  css_file = NULL,
   ...
 ) {
-  requires_xaringanthemer_env()
+  requires_xaringanthemer_env(css_file = css_file, try_css = TRUE)
   requires_package(fn = "xaringan_theme")
 
   background_color <- background_color %||% xaringanthemer_env$inverse_background_color

man/theme_xaringan_inverse.Rd

   background_color = NULL,
   accent_color = NULL,
   accent_secondary_color = NULL,
+  css_file = NULL,
   ...
 )
 }
 \item{accent_secondary_color}{Color for secondary accents, inherits from
 \code{text_bold_color}}
 
+\item{css_file}{Path to a \pkg{xaringanthemer} CSS file, from which the
+theme variables and values will be inferred. In general, if you use the
+\pkg{xaringathemer} defaults, you will not need to set this. This feature
+lets you create a \pkg{ggplot2} theme for your \pkg{xaringan} slides, even
+if you have only saved your theme CSS file and you aren't creating your
+CSS theme with \pkg{xaringanthemer} in your slides' source file.}
+
 \item{...}{
   Arguments passed on to \code{\link[=theme_xaringan_base]{theme_xaringan_base}}
   \describe{