gnu: Add font-google-material-design-icons.

* gnu/packages/font.scm (font-google-material-design-icons): New
variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/fonts.scm

@@ -1142,3 +1142,51 @@ Holmes type foundry, released under the same license as the Go programming
 language.  It includes a set of proportional, sans-serif fonts, and a set of
 monospace, slab-serif fonts.")
      (license (package-license go-1.4)))))
+
+(define-public font-google-material-design-icons
+  (package
+   (name "font-google-material-design-icons")
+   (version "3.0.1")
+   (source (origin
+            (method url-fetch)
+            (uri (string-append
+                   "https://github.com/google/material-design-icons/archive/"
+                    version ".tar.gz"))
+            (sha256
+             (base32
+              "183n0qv3q8w6n27libarq1fhc4mqv2d3sasbfmbn7x9r5pw9c6ga"))
+            (file-name (string-append name "-" version ".tar.gz"))))
+   (build-system trivial-build-system)
+   (native-inputs
+    `(("tar" ,tar)
+      ("gzip" ,gzip)))
+   (arguments
+    `(#:modules ((guix build utils))
+      #:builder (begin
+                  (use-modules (guix build utils))
+                  (let* ((font-dir (string-append %output
+                                                  "/share/fonts/truetype"))
+                         (source (assoc-ref %build-inputs "source"))
+                         (font-filename "MaterialIcons-Regular.ttf")
+                         (src-ttf-file (string-append "material-design-icons-"
+                                                      ,version
+                                                      "/iconfont/"
+                                                      font-filename))
+                         (dest-ttf-file (string-append font-dir font-filename))
+                         (gzip (assoc-ref %build-inputs "gzip"))
+                         (tar (assoc-ref %build-inputs "tar")))
+                    (setenv "PATH" (string-append gzip "/bin:"
+                                                  tar "/bin:"))
+                    (system* "tar" "xf" source)
+                    (mkdir-p font-dir)
+                    (copy-file src-ttf-file dest-ttf-file)))))
+   (home-page "http://google.github.io/material-design-icons")
+   (synopsis "Icon font of Google Material Design icons")
+   (description
+    "Material design system icons are simple, modern, friendly, and sometimes
+quirky.  Each icon is created using our design guidelines to depict in simple
+and minimal forms the universal concepts used commonly throughout a UI.
+Ensuring readability and clarity at both large and small sizes, these icons
+have been optimized for beautiful display on all common platforms and display
+resolutions.")
+   (license license:asl2.0)))