bug#27049: [PATCH 2/2] gnu: Add js-mathjax.

[Arun Isaac <arunisaac@systemreboot.net>]

* gnu/packages/javascript.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* gnu/packages/javascript.scm (js-mathjax): New variable.
---
 gnu/local.mk                |  1 +
 gnu/packages/javascript.scm | 90 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 91 insertions(+)
 create mode 100644 gnu/packages/javascript.scm

diff --git a/gnu/local.mk b/gnu/local.mk
index e7d5ee2f4..efeb57ab9 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -208,6 +208,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/irc.scm  			\
   %D%/packages/iso-codes.scm			\
   %D%/packages/java.scm				\
+  %D%/packages/javascript.scm			\
   %D%/packages/jemalloc.scm			\
   %D%/packages/jrnl.scm				\
   %D%/packages/julia.scm			\
diff --git a/gnu/packages/javascript.scm b/gnu/packages/javascript.scm
new file mode 100644
index 000000000..de8567dc4
--- /dev/null
+++ b/gnu/packages/javascript.scm
@@ -0,0 +1,90 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 Arun Isaac <arunisaac@systemreboot.net>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages javascript)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages base)
+  #:use-module (gnu packages compression)
+  #:use-module (gnu packages fonts)
+  #:use-module (gnu packages lisp)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system trivial))
+
+(define-public js-mathjax
+  (package
+    (name "js-mathjax")
+    (version "2.7.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "https://github.com/mathjax/MathJax/archive/"
+             version ".tar.gz"))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "0sbib5lk0jrvbq6s72ag6ss3wjlz5wnk07ddxij1kp96yg3c1d1b"))))
+    (build-system trivial-build-system)
+    (arguments
+     `(#:modules ((guix build utils))
+       #:builder
+       (begin
+         (use-modules (guix build utils)
+                      (ice-9 match)
+                      (ice-9 regex))
+         (setenv "PATH" (string-join (map (match-lambda
+                                            ((_ . input-path)
+                                             (string-append input-path "/bin")))
+                                          %build-inputs)
+                                     ":"))
+         (let ((install-directory (string-append %output "/share/javascript/mathjax")))
+           (system* "tar" "xvf" (assoc-ref %build-inputs "source")
+                    "MathJax-2.7.1/unpacked" "--strip" "2")
+           (mkdir-p install-directory)
+           (symlink (string-append (assoc-ref %build-inputs "font-mathjax")
+                                   "/share/fonts/mathjax")
+                    (string-append install-directory "/fonts"))
+
+           (for-each
+            (lambda (file)
+              (let ((install-path (string-append install-directory
+                                                 ;; remove prefix "."
+                                                 (string-drop file 1))))
+                (format #t "~a -> ~a~%" file install-path)
+                (cond
+                 ((string-match "\\.js$" file)
+                  (mkdir-p (dirname install-path))
+                  (system (format #f "uglify-js ~a > ~a" file install-path)))
+                 (else
+                  (install-file file (dirname install-path))))))
+            (find-files "."))))))
+    (native-inputs
+     `(("font-mathjax" ,font-mathjax)
+       ("gzip" ,gzip)
+       ("tar" ,tar)
+       ("uglify-js" ,uglify-js)))
+    (home-page "https://www.mathjax.org/")
+    (synopsis "JavaScript display engine for LaTeX, MathML, and AsciiMath")
+    (description "MathJax is a JavaScript display engine for LaTeX, MathML,
+and AsciiMath notation that works in all modern browsers.  It requires no
+plugins or software to be installed on the browser.  So the page author can
+write web documents that include mathematics and be confident that readers will
+be able to view it naturally and easily.")
+    (license license:asl2.0)))
-- 
2.12.2