From d146001fcd287b5d0b17f820b4caabcdec1b976d Mon Sep 17 00:00:00 2001
From: Noritada Kobayashi <noritada.kobayashi@gmail.com>
Date: Tue, 9 Jan 2024 20:10:31 +0900
Subject: [PATCH] Switch dynamic version handling from pkg_resources (in
 setuptools) to packaging

This fixes following `ModuleNotFoundError` resulting from missing
dependency on setuptools:

    % rye add pygrib --path /path/to/repo
    % rye sync
    % rye run python -c 'import pygrib'
    ModuleNotFoundError: No module named 'pkg_resources'

In the executable code of pygrib, setuptools is only used for version
comparison purposes, and since setuptools is larger than necessary, this
commit replaces it with packaging, which is a more compact module
containing reusable core utilities for Python packaging compliant with
recent PEPs.
---
 Changelog              | 4 ++++
 pyproject.toml         | 1 +
 src/pygrib/_pygrib.pyx | 4 ++--
 3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/Changelog b/Changelog
index 12eaaf7d..4a5fc040 100644
--- a/Changelog
+++ b/Changelog
@@ -1,3 +1,7 @@
+since version 2.1.5 release
+===========================
+* switch dynamic version handling from pkg_resources (in setuptools) to packaging
+
 version 2.1.5 release
 =====================
 * remove python 3.6 support, add python 3.11,3.12
diff --git a/pyproject.toml b/pyproject.toml
index 5618a2d5..af194b67 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,6 +29,7 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
 dependencies = [
+    "packaging",
     "pyproj",
     "numpy",
 ]
diff --git a/src/pygrib/_pygrib.pyx b/src/pygrib/_pygrib.pyx
index 949f29d4..f5896676 100644
--- a/src/pygrib/_pygrib.pyx
+++ b/src/pygrib/_pygrib.pyx
@@ -9,7 +9,7 @@ import os
 from datetime import datetime
 from io import BufferedReader
 from os import PathLike
-from pkg_resources import parse_version
+from packaging import version
 from numpy import ma
 import pyproj
 npc.import_array()
@@ -1391,7 +1391,7 @@ cdef class gribmessage(object):
                 else:
                     scalea = 1.
                     scaleb = 1.
-                if parse_version(grib_api_version) < parse_version('1.9.0'):
+                if version.parse(grib_api_version) < version.parse('1.9.0'):
                     projparams['a']=self['scaledValueOfMajorAxisOfOblateSpheroidEarth']*scalea
                     projparams['b']=self['scaledValueOfMinorAxisOfOblateSpheroidEarth']*scaleb
                 else: