fix(cli): fix parsing CLI objects to classnames

nejch · nejch · commit 32c990fd6a9e · 2021-02-26T20:00:23.000+01:00
diff --git a/gitlab/cli.py b/gitlab/cli.py
@@ -21,11 +21,16 @@
 import functools
 import re
 import sys
-from typing import Any, Callable, Dict, Tuple
+from typing import Any, Callable, Dict, Tuple, Type
+
+from requests.structures import CaseInsensitiveDict
 
 import gitlab.config
 
-camel_re = re.compile("(.)([A-Z])")
+# Full credit for this regex goes to:
+# https://github.com/jpvanhal/inflection/blob/master/inflection/__init__.py
+camel_upperlower_regex = re.compile(r"([A-Z]+)([A-Z][a-z])")
+camel_lowerupper_regex = re.compile(r"([a-z\d])([A-Z])")
 
 # custom_actions = {
 #    cls: {
@@ -72,12 +77,20 @@ def die(msg: str, e=None) -> None:
     sys.exit(1)
 
 
-def what_to_cls(what: str) -> str:
-    return "".join([s.capitalize() for s in what.split("-")])
+def what_to_cls(what: str, namespace: Type) -> Type:
+    """Given a kebab-case string from a CLI argument, return a corresponding
+    (CamelCase) class in a given namespace with a case-insensitive lookup."""
+    classes = CaseInsensitiveDict(namespace.__dict__)
+    lowercase_class = what.replace("-", "")
+
+    return classes[lowercase_class]
 
 
 def cls_to_what(cls) -> str:
-    return camel_re.sub(r"\1-\2", cls.__name__).lower()
+    """Convert CamelCase class names to kebab-case in two steps, to ensure names
+    with whole upper-case words are correctly dash-separated as well."""
+    dash_upper = camel_upperlower_regex.sub(r"\1-\2", cls.__name__)
+    return camel_lowerupper_regex.sub(r"\1-\2", dash_upper).lower()
 
 
 def _get_base_parser(add_help: bool = True) -> argparse.ArgumentParser:
diff --git a/gitlab/tests/test_cli.py b/gitlab/tests/test_cli.py
@@ -29,20 +29,37 @@
 import gitlab.v4.cli
 
 
-def test_what_to_cls():
-    assert "Foo" == cli.what_to_cls("foo")
-    assert "FooBar" == cli.what_to_cls("foo-bar")
+@pytest.mark.parametrize(
+    "what,expected_class",
+    [
+        ("class", "Class"),
+        ("test-class", "TestClass"),
+        ("test-longer-class", "TestLongerClass"),
+    ],
+)
+def test_what_to_cls(what, expected_class):
+    def _namespace():
+        pass
 
+    ExpectedClass = type(expected_class, (), {})
+    _namespace.__dict__[expected_class] = ExpectedClass
 
-def test_cls_to_what():
-    class Class(object):
-        pass
+    assert cli.what_to_cls(what, _namespace) == ExpectedClass
 
-    class TestClass(object):
-        pass
 
-    assert "test-class" == cli.cls_to_what(TestClass)
-    assert "class" == cli.cls_to_what(Class)
+@pytest.mark.parametrize(
+    "class_name,expected_what",
+    [
+        ("Class", "class"),
+        ("TestClass", "test-class"),
+        ("TestUPPERCASEClass", "test-uppercase-class"),
+        ("UPPERCASETestClass", "uppercase-test-class"),
+    ],
+)
+def test_cls_to_what(class_name, expected_what):
+    TestClass = type(class_name, (), {})
+
+    assert cli.cls_to_what(TestClass) == expected_what
 
 
 def test_die():
diff --git a/gitlab/v4/cli.py b/gitlab/v4/cli.py
@@ -28,8 +28,8 @@
 
 class GitlabCLI(object):
     def __init__(self, gl, what, action, args):
-        self.cls_name = cli.what_to_cls(what)
-        self.cls = gitlab.v4.objects.__dict__[self.cls_name]
+        self.cls = cli.what_to_cls(what, namespace=gitlab.v4.objects)
+        self.cls_name = self.cls.__name__
         self.what = what.replace("-", "_")
         self.action = action.lower()
         self.gl = gl
