New package: libnotify (#15769)

* [libnotify] created template

* [libnotify] added homepage and description

* [libnotify] added dependencies

* [libnotify] patch location to docbook

* [libnotify] more dependency work

* [libnotify] reorder dependencies

* [libnotify] added variant docbook

* [libnotify] more accurate dependency version

* [libnotify] xsltproc still needed

* [libnotify] created test variant

* [libnotify] added gtkdoc varient

* [libnotify] cleaned up leftover fixme

* [libnotify] flake8

* [libnotify] test variant became self.run_tests

* [libnotify] pkgconfig is build dependency

* [libnotify] commented out broken variants

* [libnotify] flake8

var/spack/repos/builtin/packages/libnotify/docbook-location.patch

@@ -0,0 +1,11 @@
+--- a/meson.build	2020-03-30 14:00:26.851258170 -0400
++++ b/meson.build	2020-03-30 14:03:43.134195999 -0400
+@@ -54,7 +54,7 @@
+ 
+ if get_option('man')
+   xsltproc = find_program('xsltproc', required: true)
+-  stylesheet = 'http://docbook.sourceforge.net/release/xsl-ns/current/manpages/docbook.xsl'
++  stylesheet = 'http://cdn.docbook.org/release/xsl/current/manpages/docbook.xsl'
+   xsltproc_command = [
+     xsltproc,
+     '--nonet',

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

@@ -0,0 +1,57 @@
+# 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 *
+
+
+class Libnotify(MesonPackage):
+    """libnotify is a library for sending desktop notifications"""
+
+    homepage = "https://github.com/GNOME/libnotify"
+    url      = "https://github.com/GNOME/libnotify/archive/0.7.9.tar.gz"
+
+    version('0.7.9', sha256='9bd4f5fa911d27567e7cc2d2d09d69356c16703c4e8d22c0b49a5c45651f3af0')
+
+    # Libnotify is having trouble with finding the DTD and XSLT for docbook,
+    # which is required for both of these varients.
+    # variant('docbook', default=False,
+    #         description='Build docbook docs. Currently broken')
+    # variant('gtkdoc', default=False,
+    #         description='Build with gtkdoc. Currently broken')
+
+    depends_on('pkgconfig', type='build')
+    depends_on('glib@2.26.0:')
+    depends_on('gtkplus@2.90:')
+    depends_on('gobject-introspection')
+    depends_on('libxslt', type='build')
+    depends_on('docbook-xsl', type='build')
+    # depends_on('gtk-doc', when='+gtkdoc', type='build')
+    # depends_on('xmlto', when='+docbook', type='build')
+
+    patch('docbook-location.patch')
+
+    def meson_args(self):
+        # spec = self.spec
+        args = []
+
+        # if '+docbook' in spec:
+        #     args.append('-Ddocbook_docs=enabled')
+        # else:
+        #     args.append('-Ddocbook_docs=disabled')
+        args.append('-Ddocbook_docs=disabled')
+
+        # if self.run_tests:
+        #     args.append('-Dtests=true')
+        # else:
+        #     args.append('-Dtests=false')
+        args.append('-Dtests=false')
+
+        # if '+gtkdoc' in spec:
+        #     args.append('-Dgtk_doc=true')
+        # else:
+        #     args.append('-Dgtk_doc=false')
+        args.append('-Dgtk_doc=false')
+
+        return args