move to pyproject installer

pyproject.toml

@@ -0,0 +1,37 @@
+[project]
+name = "shlib"
+version = "1.5"
+description = "shell library"
+readme = "README.rst"
+dependencies = [
+    "braceexpand",   # optional
+    "inform>=1.28",  # optional
+]
+requires-python = ">=3.6"
+keywords = [
+    "shlib",
+    "shell",
+    "shell utilities",
+]
+authors = [
+    {name = "Ken Kundert"},
+    {email = "shlib@nurdletech.com"}
+]
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
+    "Natural Language :: English",
+    "Operating System :: POSIX :: Linux",
+    "Programming Language :: Python :: 3",
+    "Topic :: Utilities",
+]
+
+[project.urls]
+homepage = "https://github.com/kenkundert/shlib"
+documentation = "https://github.com/kenkundert/shlib"
+repository = "https://github.com/kenkundert/shlib"
+
+[build-system]
+requires = ["flit_core >=2,<4"]
+build-backend = "flit_core.buildapi"

shlib/shlib.py

@@ -454,14 +454,14 @@ def lsf(*args, **kwargs):
 # Path list functions (leaves, cartesian_product, brace_expand, etc.) {{{1
 def _leaves(path, hidden, report):
     try:
-        for each in path.iterdir():
-            if each.is_dir():
+        if path.is_file():
+            if hidden or not path.name.startswith("."):
+                yield path
+        elif path.is_dir():
+            for each in path.iterdir():
                 if hidden or not each.name.startswith("."):
                     for p in _leaves(each, hidden, report):
                         yield p
-            elif each.is_file():
-                if hidden or not each.name.startswith("."):
-                    yield each
     except OSError as e:
         if report:
             report(e)