Add package for open source Shiny Server (#3688)

* The beginnings of a package for shiny-server

Just stashing a WIP.

This doesn't work.

This goes for a while and/but blows up with some OpenSSL related issue.

* Make it work!

Yay!

* shiny-server needs R with X support

My environment gets this for "free" from my packages.yaml, but it
should be explicity.

* Address feedback

- python version
- gcc dependency
- Flake8 comment rules

* Richer caveats and warnings.

* Convert to CMakePackage and fix python version typo

* Fix typo: noqab -> noqa

* Ensure proper build location, clean up comments

var/spack/repos/builtin/packages/shiny-server/package.py

@@ -0,0 +1,77 @@
+##############################################################################
+# Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://github.com/llnl/spack
+# Please also see the LICENSE file for our notice and the LGPL.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License (as
+# published by the Free Software Foundation) version 2.1, February 1999.
+#
+# This program 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 terms and
+# conditions of the GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##############################################################################
+from spack import *
+
+
+class ShinyServer(CMakePackage):
+    """Shiny server lets you put shiny web applications and interactive
+       documents online. Take your shiny apps and share them with your
+       organization or the world."""
+
+    #
+    # HEADS UP:
+    # 1. The shiny server installation step will download various node
+    #    and npm bits from the net.  They seem to have them well
+    #    constrained ("npm shrinkwrap"?), but this package is not
+    #    "air gappable".
+    # 2. Docs say that it requires 'gcc'.  depends_on() won't do the
+    #    right thing, it's Up To You.
+    #
+    homepage = "https://www.rstudio.com/products/shiny/shiny-server/"
+    url = "https://github.com/rstudio/shiny-server/archive/v1.5.3.838.tar.gz"
+
+    version('1.5.3.838', '96f20fdcdd94c9e9bb851baccb82b97f')
+
+    depends_on('python@:2.9.99')  # docs say: "Really.  3.x will not work"
+    depends_on('cmake@2.8.10:')
+    depends_on('git')
+    depends_on('r+X')
+    depends_on('openssl')
+
+    def cmake_args(self):
+        spec = self.spec
+        options = []
+
+        options.extend([
+            "-DPYTHON=%s" % join_path(spec['python'].prefix.bin, 'python'),
+        ])
+
+        return options
+
+    # Recompile the npm modules included in the project
+    @run_after('build')
+    def build_node(self):
+        bash = which('bash')
+        mkdirp('build')
+        bash('-c', 'bin/npm --python="$PYTHON" install')
+        bash('-c', 'bin/node ./ext/node/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js --python="$PYTHON" rebuild')  # noqa: E501
+
+    def setup_environment(self, spack_env, run_env):
+        run_env.prepend_path('PATH',
+                             join_path(self.prefix, 'shiny-server', 'bin'))
+        # shiny comes with its own pandoc; hook it up...
+        run_env.prepend_path('PATH',
+                             join_path(self.prefix, 'shiny-server',
+                                       'ext', 'pandoc', 'static'))