[py-meshio] Added py-meshio package (#25578)

* Added py-meshio package

* Added setuptools dependency to py-meshio package

* Update var/spack/repos/builtin/packages/py-meshio/package.py

Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>

* Update var/spack/repos/builtin/packages/py-meshio/package.py

Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>

* Update var/spack/repos/builtin/packages/py-meshio/package.py

Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>

* Update var/spack/repos/builtin/packages/py-meshio/package.py

Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>

* Update var/spack/repos/builtin/packages/py-meshio/package.py

Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>

* added missing py-importlib-metadata dependency in py-meshio

Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>

var/spack/repos/builtin/packages/py-meshio/package.py

@@ -0,0 +1,24 @@
+# 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)
+
+from spack import *
+
+
+class PyMeshio(PythonPackage):
+    """MeshIO is a Python library to read and write many mesh formats."""
+
+    homepage = "https://github.com/nschloe/meshio"
+    pypi = "meshio/meshio-5.0.0.tar.gz"
+
+    version('5.0.0', sha256='f6327c06d6171d30e0991d3dcb048751035f9cfac1f19e2444971275fd971188')
+
+    # MeshIO uses a setup.cfg/pyproject.toml structure, which spack doesn't yet handle.
+    # This patch adds a small setup.py file that spack can call.
+    patch('setup.patch')
+
+    depends_on('python@3.7:', type=('build', 'run'))
+    depends_on('py-setuptools', type='build')
+    depends_on('py-numpy', type=('build', 'run'))
+    depends_on('py-importlib-metadata', when='^python@:3.7', type=('build', 'run'))

var/spack/repos/builtin/packages/py-meshio/setup.patch

@@ -0,0 +1,10 @@
+diff --git a/setup.py b/setup.py
+new file mode 100644
+index 0000000..7f1a176
+--- /dev/null
++++ b/setup.py
+@@ -0,0 +1,4 @@
++from setuptools import setup
++
++if __name__ == "__main__":
++    setup()