Add package for Hugo (static website generator) (#10358)

var/spack/repos/builtin/packages/hugo/package.py

+# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+from spack.util.executable import which
+
+
+class Hugo(Package):
+    """The world's fastest framework for building websites."""
+
+    homepage = "https://gohugo.io"
+    url      = "https://github.com/gohugoio/hugo/archive/v0.53.tar.gz"
+
+    version('0.53', sha256='48e65a33d3b10527101d13c354538379d9df698e5c38f60f4660386f4232e65c')
+
+    # Uses go modules.
+    # See https://gohugo.io/getting-started/installing/#fetch-from-github
+    depends_on('go@1.11:', when='@0.48:', type='build')
+
+    def install(self, spec, prefix):
+        go = which('go')
+        go('build')
+        mkdir(prefix.bin)
+        install('hugo', prefix.bin)