Include xaringanthemer package version in output header

DESCRIPTION

-Package: xaringanthemer
 Type: Package
+Package: xaringanthemer
 Title: Xaringan CSS Theme Generator
 Version: 0.2.0.9000
 Date: 2018-04-16
-Authors@R: person("Garrick", "Aden-Buie", email = "g.adenbuie@gmail.com", role = c("aut", "cre"))
-Description: Create and edit your xaringan CSS files from within your R
-    R Markdown slide source. More technically, this package actually creates
-    valid remarkjs CSS themes that are easily used by xarangan.
+Authors@R: 
+    person(given = "Garrick",
+           family = "Aden-Buie",
+           role = c("aut", "cre"),
+           email = "garrick@adenbuie.com")
+Description: Create and edit your xaringan CSS files from within
+    your R R Markdown slide source. More technically, this package
+    actually creates valid remarkjs CSS themes that are easily used by
+    xarangan.
 License: MIT + file LICENSE
 URL: https://github.com/gadenbuie/xaringanthemer
 BugReports: https://github.com/gadenbuie/xaringanthemer/issues
-Encoding: UTF-8
-LazyData: true
-RoxygenNote: 6.1.1
-Roxygen: list(markdown = TRUE)
-Suggests: 
-    testthat,
-    xaringan,
-    here,
-    knitr,
-    rmarkdown
 Imports: 
-    purrr,
-    tibble,
     glue,
+    purrr,
     stringr,
+    tibble,
+    utils,
     whisker
-VignetteBuilder: knitr
+Suggests: 
+    here,
+    knitr,
+    rmarkdown,
+    testthat,
+    xaringan
+VignetteBuilder: 
+    knitr
+Encoding: UTF-8
+LazyData: true
+Roxygen: list(markdown = TRUE)
+RoxygenNote: 6.1.1

R/write_theme.R

   )
   table_row_even_background_color <- table_row_even_background_color %||% background_color
   
+  xaringanthemer_version <- utils::packageVersion("xaringanthemer")
+  
   tf <- system.file("resources", "template.css", package = "xaringanthemer")
   template <- readLines(tf, warn = FALSE)
   template <- paste(template, collapse = "\n")

inst/resources/template.css

  *    - xaringan wiki: https://github.com/yihui/xaringan/wiki
  *    - remarkjs wiki: https://github.com/gnab/remark/wiki
  *
+{{#xaringanthemer_version}} *  Version: {{xaringanthemer_version}}{{/xaringanthemer_version}}
+ *
  * ------------------------------------------------------- */
 @import url({{text_font_url}});
 @import url({{header_font_url}});

inst/scripts/write_xaringan_theme_body.R

 )
 table_row_even_background_color <- table_row_even_background_color %||% background_color
 
+xaringanthemer_version <- utils::packageVersion("xaringanthemer")
+
 tf <- system.file("resources", "template.css", package = "xaringanthemer")
 template <- readLines(tf, warn = FALSE)
 template <- paste(template, collapse = "\n")

man/xaringanthemer-package.Rd

 \alias{xaringanthemer-package}
 \title{xaringanthemer: Xaringan CSS Theme Generator}
 \description{
-Create and edit your xaringan CSS files from within your R
-    R Markdown slide source. More technically, this package actually creates
-    valid remarkjs CSS themes that are easily used by xarangan.
+Create and edit your xaringan CSS files from within
+    your R R Markdown slide source. More technically, this package
+    actually creates valid remarkjs CSS themes that are easily used by
+    xarangan.
 }
 \seealso{
 Useful links:
 
 }
 \author{
-\strong{Maintainer}: Garrick Aden-Buie \email{g.adenbuie@gmail.com}
+\strong{Maintainer}: Garrick Aden-Buie \email{garrick@adenbuie.com}
 
 }
 \keyword{internal}

tests/testthat/css/duo.css

  *    - xaringan wiki: https://github.com/yihui/xaringan/wiki
  *    - remarkjs wiki: https://github.com/gnab/remark/wiki
  *
+ *  Version: a.b.c.d.eeee
+ *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic);
 @import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);

tests/testthat/css/duo_accent.css

  *    - xaringan wiki: https://github.com/yihui/xaringan/wiki
  *    - remarkjs wiki: https://github.com/gnab/remark/wiki
  *
+ *  Version: a.b.c.d.eeee
+ *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic);
 @import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);

tests/testthat/css/duo_accent_inverse.css

  *    - xaringan wiki: https://github.com/yihui/xaringan/wiki
  *    - remarkjs wiki: https://github.com/gnab/remark/wiki
  *
+ *  Version: a.b.c.d.eeee
+ *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic);
 @import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);

tests/testthat/css/mono_accent.css

  *    - xaringan wiki: https://github.com/yihui/xaringan/wiki
  *    - remarkjs wiki: https://github.com/gnab/remark/wiki
  *
+ *  Version: a.b.c.d.eeee
+ *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic);
 @import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);

tests/testthat/css/mono_accent_inverse.css

  *    - xaringan wiki: https://github.com/yihui/xaringan/wiki
  *    - remarkjs wiki: https://github.com/gnab/remark/wiki
  *
+ *  Version: a.b.c.d.eeee
+ *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic);
 @import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);

tests/testthat/css/mono_dark.css

  *    - xaringan wiki: https://github.com/yihui/xaringan/wiki
  *    - remarkjs wiki: https://github.com/gnab/remark/wiki
  *
+ *  Version: a.b.c.d.eeee
+ *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic);
 @import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);

tests/testthat/css/mono_light.css

  *    - xaringan wiki: https://github.com/yihui/xaringan/wiki
  *    - remarkjs wiki: https://github.com/gnab/remark/wiki
  *
+ *  Version: a.b.c.d.eeee
+ *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic);
 @import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);

tests/testthat/css/solarized_dark.css

  *    - xaringan wiki: https://github.com/yihui/xaringan/wiki
  *    - remarkjs wiki: https://github.com/gnab/remark/wiki
  *
+ *  Version: a.b.c.d.eeee
+ *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic);
 @import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);

tests/testthat/css/solarized_light.css

  *    - xaringan wiki: https://github.com/yihui/xaringan/wiki
  *    - remarkjs wiki: https://github.com/gnab/remark/wiki
  *
+ *  Version: a.b.c.d.eeee
+ *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic);
 @import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);

tests/testthat/test-themes.R

   theme_file <- paste0(theme, ".css")
 
   theme_fun(outfile = tmpfile)
-  theme_css <- paste(readLines(tmpfile), collapse = "\n")
+  theme_css <- readLines(tmpfile)
+  # Mask package version in test files
+  theme_css <- sub("( \\*  Version: )[\\d.-]+", "\\1a.b.c.d.eeee", theme_css, perl = TRUE)
+  theme_css <- paste(theme_css, collapse = "\n")
   expect_known_output(cat(theme_css), test_path("css", theme_file))
 }