New package: go-md2man (#12397)

* bump eospac version

* Revert "bump eospac version"

This reverts commit 835b1f822d.

* new package: go-md2man

* address comments by @adamjstewart

var/spack/repos/builtin/packages/go-md2man/package.py

@@ -0,0 +1,45 @@
+# 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 GoMd2man(Package):
+    """go-md2man converts markdown into roff (man pages)"""
+
+    homepage = "https://github.com/cpuguy83/go-md2man"
+    url      = "https://github.com/cpuguy83/go-md2man/archive/v1.0.10.tar.gz"
+
+    version('1.0.10', sha256='76aa56849123b99b95fcea2b15502fd886dead9a5c35be7f78bdc2bad6be8d99')
+
+    depends_on('go')
+
+    resource(name='blackfriday',
+             url='https://github.com/russross/blackfriday/archive/v1.5.2.tar.gz',
+             sha256='626138a08abb8579474a555e9d45cb5260629a2c07e8834428620a650dc9f195',
+             placement='blackfriday',
+             destination=join_path('src', 'github.com', 'russross'))
+
+    def patch(self):
+        mkdirp(join_path(self.stage.source_path,
+               'src', 'github.com', 'russross'))
+
+        mkdirp(join_path(self.stage.source_path,
+               'src', 'github.com', 'cpuguy83'))
+
+        ln = which('ln')
+        ln('-s', self.stage.source_path, join_path(
+           'src', 'github.com', 'cpuguy83', 'go-md2man'))
+
+    def install(self, spec, prefix):
+
+        with working_dir('src'):
+            env['GOPATH'] = self.stage.source_path
+            go = which('go')
+            go('build', '-v', join_path(
+               'github.com', 'cpuguy83', 'go-md2man'))
+
+            mkdir(prefix.bin)
+            install('go-md2man', prefix.bin)