gnu: Add r-rintrojs.

* gnu/packages/cran.scm (r-rintrojs): New variable.

gnu/packages/cran.scm

@@ -16375,3 +16375,65 @@ platform-specific genetic knowledge and empirical signal to readily detect and
 quantify somatic @dfn{single nucleotide variants} (SNVs) in @dfn{circulating
 cell free DNA} (cfDNA).")
     (license license:gpl3)))
+
+;; This package includes minified JavaScript files.  When upgrading please
+;; check that there are no new minified JavaScript files.
+(define-public r-rintrojs
+  (package
+    (name "r-rintrojs")
+    (version "0.2.2")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (cran-uri "rintrojs" version))
+       (sha256
+        (base32
+         "0vyqb3pyrh12saddar71ac9csn2vkd2j8ln6ygpqys8ky1lc3427"))))
+    (properties `((upstream-name . "rintrojs")))
+    (build-system r-build-system)
+    (arguments
+     `(#:modules ((guix build utils)
+                  (guix build r-build-system)
+                  (srfi srfi-1)
+                  (ice-9 popen))
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'process-javascript
+           (lambda* (#:key inputs #:allow-other-keys)
+             (with-directory-excursion "inst/javascript/introjs/"
+               (call-with-values
+                   (lambda ()
+                     (unzip2
+                      `((,(assoc-ref inputs "intro.js")
+                         "intro.min.js"))))
+                 (lambda (sources targets)
+                   (for-each (lambda (source target)
+                               (format #t "Processing ~a --> ~a~%"
+                                       source target)
+                               (let ((minified (open-pipe* OPEN_READ "uglify-js" source)))
+                                 (call-with-output-file target
+                                   (lambda (port)
+                                     (dump-port minified port)))))
+                             sources targets))))
+             #t)))))
+    (native-inputs
+     `(("uglify-js" ,uglify-js)
+       ("intro.js"
+        ,(origin
+           (method url-fetch)
+           (uri "https://raw.githubusercontent.com/usablica/intro.js/v2.9.3/intro.js")
+           (sha256
+            (base32
+             "1qf8n1sfy9qkiqqnfgg0xbhmfgh0g3mqsjas8qhz230h3zzlzxj8"))))))
+    (propagated-inputs
+     `(("r-jsonlite" ,r-jsonlite)
+       ("r-shiny" ,r-shiny)))
+    (home-page "https://github.com/carlganz/rintrojs")
+    (synopsis "Wrapper for the Intro.js library")
+    (description
+     "This package provides a wrapper for the @url{http://www.introjs.com,
+Intro.js} library.  This package makes it easy to include step-by-step
+introductions, and clickable hints in a Shiny application.  It supports both
+static introductions in the UI, and programmatic introductions from the
+server-side.")
+    (license license:agpl3+)))