Fix commands with arguments that start with "-" (#182)

* Fix commands with arguments that start with "-"

Parameters that start with "-" are interpreted as a new argument. argparse.REMAINDER forces it to interpret all everything left in the command as a list of strings instead of new arguments. Fixes issue #177

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* add test

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update tests/_legacy/test_cwp.py

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: jaimergp <jaimergp@users.noreply.github.com>

menuinst/_legacy/cwp.py

@@ -11,15 +11,17 @@
 from menuinst.knownfolders import FOLDERID, get_folder_path
 
 
-def main():
+def main(argv=None):
     # call as: python cwp.py [--no-console] PREFIX ARGs...
     parser = argparse.ArgumentParser()
     parser.add_argument(
         "--no-console", action="store_true", help="Create subprocess with CREATE_NO_WINDOW flag."
     )
     parser.add_argument("prefix", help="Prefix to be 'activated' before calling `args`.")
-    parser.add_argument("args", nargs="*", help="Command (and arguments) to be executed.")
-    parsed_args = parser.parse_args()
+    parser.add_argument(
+        "args", nargs=argparse.REMAINDER, help="Command (and arguments) to be executed."
+    )
+    parsed_args = parser.parse_args(argv)
 
     no_console = parsed_args.no_console
     prefix = parsed_args.prefix

tests/_legacy/test_cwp.py

@@ -0,0 +1,21 @@
+import sys
+from subprocess import check_output
+
+import pytest
+
+cwp = pytest.importorskip("menuinst._legacy.cwp", reason="Windows only")
+
+
+def test_cwp():
+    out = check_output(
+        [
+            sys.executable,
+            cwp.__file__,
+            sys.prefix,
+            "python",
+            "-c",
+            "import sys; print(sys.prefix)",
+        ],
+        text=True,
+    )
+    assert out.strip() == sys.prefix