From eeb0eb8cf80dae44e3015800d2503411fdd24f7f Mon Sep 17 00:00:00 2001
From: David Hotham <david.hotham@blueyonder.co.uk>
Date: Sun, 28 Aug 2022 12:44:37 +0100
Subject: [PATCH] simplify handling of extras

it's never None, or True, or False: it's just a (possibly-empty)
collection of strings
---
 src/poetry_plugin_export/exporter.py |  5 ++--
 src/poetry_plugin_export/walker.py   | 35 +++++++++++-----------------
 tests/test_exporter.py               | 19 ++-------------
 3 files changed, 19 insertions(+), 40 deletions(-)

diff --git a/src/poetry_plugin_export/exporter.py b/src/poetry_plugin_export/exporter.py
index 617fa23..8eda1dc 100644
--- a/src/poetry_plugin_export/exporter.py
+++ b/src/poetry_plugin_export/exporter.py
@@ -14,6 +14,7 @@
 
 
 if TYPE_CHECKING:
+    from collections.abc import Collection
     from pathlib import Path
 
     from packaging.utils import NormalizedName
@@ -40,14 +41,14 @@ def __init__(self, poetry: Poetry, io: IO) -> None:
         self._with_hashes = True
         self._with_credentials = False
         self._with_urls = True
-        self._extras: bool | list[NormalizedName] | None = []
+        self._extras: Collection[NormalizedName] = ()
         self._groups: Iterable[str] = [MAIN_GROUP]
 
     @classmethod
     def is_format_supported(cls, fmt: str) -> bool:
         return fmt in cls.EXPORT_METHODS
 
-    def with_extras(self, extras: bool | list[NormalizedName] | None) -> Exporter:
+    def with_extras(self, extras: Collection[NormalizedName]) -> Exporter:
         self._extras = extras
 
         return self
diff --git a/src/poetry_plugin_export/walker.py b/src/poetry_plugin_export/walker.py
index 8ec5ab9..4d295d7 100644
--- a/src/poetry_plugin_export/walker.py
+++ b/src/poetry_plugin_export/walker.py
@@ -11,9 +11,9 @@
 
 
 if TYPE_CHECKING:
+    from collections.abc import Collection
     from collections.abc import Iterable
     from collections.abc import Iterator
-    from collections.abc import Sequence
 
     from packaging.utils import NormalizedName
     from poetry.core.packages.dependency import Dependency
@@ -53,7 +53,7 @@ def get_project_dependency_packages(
     locker: Locker,
     project_requires: list[Dependency],
     project_python_marker: BaseMarker | None = None,
-    extras: bool | Sequence[NormalizedName] | None = None,
+    extras: Collection[NormalizedName] = (),
 ) -> Iterator[DependencyPackage]:
     # Apply the project python marker to all requirements.
     if project_python_marker is not None:
@@ -67,22 +67,17 @@ def get_project_dependency_packages(
     repository = locker.locked_repository()
 
     # Build a set of all packages required by our selected extras
-    extra_package_names: set[str] | None = None
-
-    if extras is not True:
-        locked_extras = {
-            canonicalize_name(extra): [
-                canonicalize_name(dependency) for dependency in dependencies
-            ]
-            for extra, dependencies in locker.lock_data.get("extras", {}).items()
-        }
-        extra_package_names = set(
-            get_extra_package_names(
-                repository.packages,
-                locked_extras,
-                extras or (),
-            )
-        )
+    locked_extras = {
+        canonicalize_name(extra): [
+            canonicalize_name(dependency) for dependency in dependencies
+        ]
+        for extra, dependencies in locker.lock_data.get("extras", {}).items()
+    }
+    extra_package_names = get_extra_package_names(
+        repository.packages,
+        locked_extras,
+        extras,
+    )
 
     # If a package is optional and we haven't opted in to it, do not select
     selected = []
@@ -92,9 +87,7 @@ def get_project_dependency_packages(
         except IndexError:
             continue
 
-        if extra_package_names is not None and (
-            package.optional and package.name not in extra_package_names
-        ):
+        if package.optional and package.name not in extra_package_names:
             # a package is locked as optional, but is not activated via extras
             continue
 
diff --git a/tests/test_exporter.py b/tests/test_exporter.py
index ee608ac..ed9dc4d 100644
--- a/tests/test_exporter.py
+++ b/tests/test_exporter.py
@@ -35,6 +35,7 @@
 
 
 if TYPE_CHECKING:
+    from collections.abc import Collection
     from pathlib import Path
 
     from packaging.utils import NormalizedName
@@ -889,22 +890,6 @@ def test_exporter_exports_requirements_txt_without_optional_packages(
 @pytest.mark.parametrize(
     ["extras", "lines"],
     [
-        (
-            None,
-            [f"foo==1.2.3 ; {MARKER_PY}"],
-        ),
-        (
-            False,
-            [f"foo==1.2.3 ; {MARKER_PY}"],
-        ),
-        (
-            True,
-            [
-                f"bar==4.5.6 ; {MARKER_PY}",
-                f"foo==1.2.3 ; {MARKER_PY}",
-                f"spam==0.1.0 ; {MARKER_PY}",
-            ],
-        ),
         (
             ["feature-bar"],
             [
@@ -918,7 +903,7 @@ def test_exporter_exports_requirements_txt_without_optional_packages(
 def test_exporter_exports_requirements_txt_with_optional_packages(
     tmp_path: Path,
     poetry: Poetry,
-    extras: bool | list[NormalizedName] | None,
+    extras: Collection[NormalizedName],
     lines: list[str],
 ) -> None:
     poetry.locker.mock_lock_data(  # type: ignore[attr-defined]