Add the pyhepmc package to the stack (#672)

packages/key4hep-stack/package.py

@@ -117,6 +117,7 @@ class Key4hepStack(BundlePackage, Key4hepPackage):
     depends_on("py-pylint", when="+devtools")
     depends_on("py-boto3", when="+devtools")
     depends_on("py-gcovr", when="+devtools")
+    depends_on("py-pyhepmc", when="+devtools")
     depends_on("py-h5py", when="+devtools")
     depends_on("py-ipykernel", when="+devtools")
     depends_on("py-ipython", when="+devtools")

packages/py-pyhepmc/package.py

@@ -0,0 +1,37 @@
+# Copyright 2013-2021 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)
+
+
+class PyPyhepmc(PythonPackage):
+    """Python bindings for HepMC3"""
+
+    homepage = "https://github.com/scikit-hep/pyhepmc"
+    pypi = "pyhepmc/pyhepmc-2.14.0.tar.gz"
+    git = "https://github.com/scikit-hep/pyhepmc.git"
+
+    tags = ["hep"]
+
+    maintainers = ["jmcarcell"]
+
+    version("main", branch="main")
+
+    version(
+        "2.14.0",
+        sha256="17a6f941e4fa06d08a628990f6816d1da5e545d65f533e6f598740d2cb76ace4",
+    )
+
+    depends_on("cmake", type="build")
+    depends_on("py-setuptools-scm", type="build")
+
+    depends_on("hepmc3", type=("build", "run"))
+    depends_on("[email protected]:", type=("build", "run"))
+    depends_on("py-pybind11", type=("build", "run"))
+    # In v2.14.0 a dot command is run at import time to check which formats are supported
+    # The system dot on Alma 9 does not support any formats and importing fails so graphviz is required
+    depends_on("graphviz", type="run")
+
+    @run_before("install")
+    def use_external_pybind11(self):
+        filter_file("(EXTERNAL_PYBIND11.*) OFF", r"\1 ON", "CMakeLists.txt")