neper: add package (spack#174)

* neper: add package
* Fix formatting

Author: jcortial-safran

repos/spack_repo/builtin/packages/neper/package.py

@@ -0,0 +1,62 @@
+# Copyright Spack Project Developers. See COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+
+from spack_repo.builtin.build_systems.cmake import CMakePackage
+
+from spack.package import *
+
+
+class Neper(CMakePackage):
+    """Neper is a software package for polycrystal generation and meshing.
+    The polycrystals can be 2D or 3D."""
+
+    homepage = "https://neper.info/"
+    url = "https://github.com/neperfepx/neper/archive/refs/tags/v4.10.1.tar.gz"
+
+    maintainers("jcortial-safran")
+
+    license("GPL-3.0-only", checked_by="jcortial-safran")
+
+    version("4.10.1", sha256="73aeb29658a73fa5fd1deec74daacc1d43fcf0f771da4157a00fb3736dbdc37e")
+
+    variant("gsl", default=True, description="Enable GNU scientific library")
+    variant("openmp", default=True, description="Enable OpenMP")
+    variant(
+        "nlopt",
+        default="external",
+        description="Enable NlOpt, using either the vendored or an external package",
+        values=("none", "internal", "external"),
+        multi=False,
+    )
+    variant(
+        "scotch",
+        default="external",
+        description="Enable SCOTCH, using either the vendored or an external package",
+        values=("none", "internal", "external"),
+        multi=False,
+    )
+
+    depends_on("c", type="build")
+    depends_on("cxx", type="build")
+
+    depends_on("gsl", when="+gsl")
+    depends_on("nlopt", when="nlopt=external")
+    depends_on("scotch", when="scotch=external")
+
+    depends_on("cmake@3:", type="build")
+
+    root_cmakelists_dir = "src"
+
+    def cmake_args(self):
+        args = [
+            self.define("CMAKE_INSTALL_COMPLETION_PREFIX", self.prefix),
+            self.define_from_variant("HAVE_GSL", "gsl"),
+            self.define_from_variant("HAVE_OPENMP", "openmp"),
+            self.define("HAVE_NLOPT", not self.spec.satisfies("nlopt=none")),
+            self.define("FORCE_BUILTIN_NLOPT", self.spec.satisfies("nlopt=internal")),
+            self.define("HAVE_LIBSCOTCH", not self.spec.satisfies("scotch=none")),
+            self.define("FORCE_BUILTIN_LIBSCOTCH", self.spec.satisfies("scotch=internal")),
+        ]
+        return args