rewrite definitions without pkg_resources

Author: alphaville

open-codegen/opengen/definitions.py

@@ -1,21 +1,27 @@
-import pkg_resources
+from importlib.resources import files, as_file
 
 
 def templates_dir():
     """Directory where the templates are found (for internal use, mainly)"""
-    return pkg_resources.resource_filename('opengen', 'templates/')
+    resource = files("opengen") / "templates"
+    with as_file(resource) as path:
+        return str(path)
 
 
 def templates_subdir(subdir=None):
     """
     Directory where the templates are found and subfolder relative
-    to that path(for internal use, mainly)
+    to that path (for internal use, mainly)
     """
-    if subdir is None:
-        return templates_dir()
-    return pkg_resources.resource_filename('opengen', 'templates/%s/' % subdir)
+    resource = files("opengen") / "templates"
+    if subdir is not None:
+        resource = resource / subdir
+    with as_file(resource) as path:
+        return str(path)
 
 
 def original_icasadi_dir():
     """Directory where the original icasadi files are found (for internal use)"""
-    return pkg_resources.resource_filename('opengen', 'icasadi/')
+    resource = files("opengen") / "icasadi"
+    with as_file(resource) as path:
+        return str(path)