Replace pkg_resources with importlib

No more dependency on setuptools!

nmodl/_binwrapper.py

@@ -3,41 +3,45 @@
 A generic wrapper to access nmodl binaries from a python installation
 Please create a softlink with the binary name to be called.
 """
-
 import os
-import sys
 import stat
-from pkg_resources import working_set
+import sys
+
+if sys.version_info >= (3, 9):
+    from importlib.metadata import metadata
+    from importlib.resources import files
+else:
+    from importlib_metadata import metadata
+    from importlib_resources import files
+
 from find_libpython import find_libpython
 
 
 def main():
     """Sets the environment to run the real executable (returned)"""
 
-    package_name = "nmodl"
-
-    if package_name not in working_set.by_key:
-        print ("INFO : Using nmodl-nightly Package (Developer Version)")
-        package_name = 'nmodl-nightly'
-
-    assert (
-        package_name in working_set.by_key
-    ), "NMODL package not found! Verify PYTHONPATH"
+    try:
+        metadata("nmodl-nightly")
+        print("INFO : Using nmodl-nightly Package (Developer Version)")
+    except Exception:
+        pass
 
-    NMODL_PREFIX = os.path.join(working_set.by_key[package_name].location, "nmodl")
-    NMODL_HOME = os.path.join(NMODL_PREFIX, ".data")
-    NMODL_BIN = os.path.join(NMODL_HOME, "bin")
+    NMODL_PREFIX = files("nmodl")
+    NMODL_HOME = NMODL_PREFIX / ".data"
+    NMODL_BIN = NMODL_HOME / "bin"
 
     # add libpython*.so path to environment
     os.environ["NMODL_PYLIB"] = find_libpython()
 
     # add nmodl home to environment (i.e. necessary for nrnunits.lib)
-    os.environ["NMODLHOME"] = NMODL_HOME
+    os.environ["NMODLHOME"] = str(NMODL_HOME)
 
     # set PYTHONPATH for embedded python to properly find the nmodl module
-    os.environ["PYTHONPATH"] = working_set.by_key[package_name].location + ':' + os.environ.get("PYTHONPATH", "")
+    os.environ["PYTHONPATH"] = (
+        str(NMODL_PREFIX) + ":" + os.environ.get("PYTHONPATH", "")
+    )
 
-    exe = os.path.join(NMODL_BIN, os.path.basename(sys.argv[0]))
+    exe = NMODL_BIN / os.path.basename(sys.argv[0])
     st = os.stat(exe)
     os.chmod(exe, st.st_mode | stat.S_IEXEC)
     os.execv(exe, sys.argv)

pyproject.toml

@@ -10,7 +10,8 @@ dynamic = ["version"]
 dependencies = [
     "find_libpython",
     "sympy>=1.3",
-    "setuptools",
+    "importlib-metadata;python_version<'3.9'",
+    "importlib-resources;python_version<'3.9'",
 ]
 scripts = {nmodl = "nmodl._binwrapper:main"}
 requires-python = ">=3.8"