fix: allow installation of uv workspaces sourced packages

Fixes: #233

Author: ssbarnea

src/tox_uv/_installer.py

@@ -5,9 +5,11 @@
 import logging
 from collections import defaultdict
 from collections.abc import Sequence
+from functools import cached_property
 from itertools import chain
 from typing import TYPE_CHECKING, Any, Final
 
+import tomllib
 from packaging.requirements import Requirement
 from packaging.utils import parse_sdist_filename, parse_wheel_filename
 from tox.config.types import Command
@@ -101,6 +103,17 @@ def install(self, arguments: Any, section: str, of_type: str) -> None:  # noqa:
             _LOGGER.warning("uv cannot install %r", arguments)  # pragma: no cover
             raise SystemExit(1)  # pragma: no cover
 
+    @cached_property
+    def _sourced_pkg_names(self) -> set[str]:
+        pyproject_file = self._env.conf._conf.src_path.parent / "pyproject.toml"  # noqa: SLF001
+        if not pyproject_file.exists():  # check if it's static PEP-621 metadata
+            return set()
+        with pyproject_file.open("rb") as file_handler:
+            pyproject = tomllib.load(file_handler)
+
+        sources = pyproject.get("tool", {}).get("uv", {}).get("sources", {})
+        return {key for key, val in sources.items() if val.get("workspace", False)}
+
     def _install_list_of_deps(  # noqa: C901, PLR0912
         self,
         arguments: Sequence[
@@ -114,7 +127,15 @@ def _install_list_of_deps(  # noqa: C901, PLR0912
             if isinstance(arg, Requirement):  # pragma: no branch
                 groups["req"].append(str(arg))  # pragma: no cover
             elif isinstance(arg, (WheelPackage, SdistPackage, EditablePackage)):
-                groups["req"].extend(str(i) for i in arg.deps)
+                for i in arg.deps:
+                    if (
+                        isinstance(i, Requirement)
+                        and i.name in self._sourced_pkg_names
+                        and "." not in groups["uv_editable"]
+                    ):
+                        groups["uv_editable"].append(".")
+                        continue
+                    groups["req"].append(str(i))
                 parser = parse_sdist_filename if isinstance(arg, SdistPackage) else parse_wheel_filename
                 name, *_ = parser(arg.path.name)
                 groups["pkg"].append(f"{name}@{arg.path}")