Customization of the Paraview module file to its nonstandard directory structure (#5799)

* Add the custom paraview lib directory structure to the library paths in the paraview module file.

* Fixing flake8 issues.

* Checking if lib64 exists for paraview module file generation, else use lib.

* Fixing more flake8 problems I introduced.

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

@@ -23,6 +23,7 @@
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ##############################################################################
 from spack import *
+import os
 
 
 class Paraview(CMakePackage):
@@ -89,6 +90,17 @@ def url_for_version(self, version):
         else:
             return self._urlfmt.format(version.up_to(2), version, '')
 
+    def setup_environment(self, spack_env, run_env):
+        if os.path.isdir(self.prefix.lib64):
+            lib_dir = self.prefix.lib64
+        else:
+            lib_dir = self.prefix.lib
+        paraview_version = 'paraview-%s' % self.spec.version.up_to(2)
+        run_env.prepend_path('LIBRARY_PATH', join_path(lib_dir,
+                             paraview_version))
+        run_env.prepend_path('LD_LIBRARY_PATH', join_path(lib_dir,
+                             paraview_version))
+
     def cmake_args(self):
         """Populate cmake arguments for ParaView."""
         spec = self.spec