chore: add Ruff and apply formatting across codebase

Introduce ruff lint/format config, expand .gitignore, and reformat Python sources.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/conftest.py

@@ -20,10 +20,7 @@ def make_png(
         crc = zlib.crc32(tag + data) & 0xFFFFFFFF
         return struct.pack(">I", len(data)) + tag + data + struct.pack(">I", crc)
 
-    raw = b"".join(
-        b"\x00" + bytes([r, g, b] * width)
-        for _ in range(height)
-    )
+    raw = b"".join(b"\x00" + bytes([r, g, b] * width) for _ in range(height))
     compressed = zlib.compress(raw, 9)
     ihdr = struct.pack(">IIBBBBB", width, height, 8, 2, 0, 0, 0)
     png = (
@@ -37,7 +34,7 @@ def make_png(
 
 @pytest.fixture(autouse=True)
 def _ensure_builtin_modules() -> None:
-    import imagepipeline.modules  # noqa: F401
+    pass  # noqa: F401
 
 
 @pytest.fixture

tests/test_ai_modules.py

@@ -110,9 +110,7 @@ class TestAIParameters:
         assert payload["modalities"] == ["image"]
         assert payload["image_config"] == {"strength": 0.25}
 
-    def test_save_result_matching_source_preserves_png_size(
-        self, tmp_path: Path
-    ) -> None:
+    def test_save_result_matching_source_preserves_png_size(self, tmp_path: Path) -> None:
         try:
             from PIL import Image
         except ImportError:

tests/test_pipeline.py

@@ -113,9 +113,11 @@ class TestPipelineRunner:
                 for src in ctx.input_paths:
                     shutil.copy2(src, ctx.output_dir / src.name)
 
-        with Pipeline(name="order_test", input_dir=input_dir, output_base=output_base, verbose=False) as p:
+        with Pipeline(
+            name="order_test", input_dir=input_dir, output_base=output_base, verbose=False
+        ) as p:
             step_b = p.step("order_tracker", inputs="input")
-            step_a = p.step("order_tracker", inputs=step_b)
+            p.step("order_tracker", inputs=step_b)
             p.run()
 
         assert order == ["order_tracker_01", "order_tracker_02"]
@@ -132,7 +134,9 @@ class TestPipelineRunner:
                 for src in ctx.input_paths:
                     shutil.copy2(src, ctx.output_dir / src.name)
 
-        with Pipeline(name="dup_test", input_dir=input_dir, output_base=output_base, verbose=False) as p:
+        with Pipeline(
+            name="dup_test", input_dir=input_dir, output_base=output_base, verbose=False
+        ) as p:
             first = p.step("number_tracker", inputs="input")
             p.step("number_tracker", inputs=first)
             root = p.run()
@@ -170,7 +174,9 @@ class TestCustomStepId:
                 for src in ctx.input_paths:
                     shutil.copy2(src, ctx.output_dir / src.name)
 
-        with Pipeline(name="named_test", input_dir=input_dir, output_base=output_base, verbose=False) as p:
+        with Pipeline(
+            name="named_test", input_dir=input_dir, output_base=output_base, verbose=False
+        ) as p:
             ref = p.step("named_tracker", inputs="input", step_id="input_bokeh")
             root = p.run()
 
@@ -193,7 +199,9 @@ class TestCustomStepId:
                 for src in ctx.input_paths:
                     shutil.copy2(src, ctx.output_dir / src.name)
 
-        with Pipeline(name="counter_test", input_dir=input_dir, output_base=output_base, verbose=False) as p:
+        with Pipeline(
+            name="counter_test", input_dir=input_dir, output_base=output_base, verbose=False
+        ) as p:
             p.step("counter_tracker", inputs="input")
             p.step("counter_tracker", inputs="input", step_id="custom_mid")
             p.step("counter_tracker", inputs="input")

tests/test_resume.py

@@ -13,7 +13,6 @@ from imagepipeline.core.resume import (
 )
 from imagepipeline.core.step import StepDefinition
 from imagepipeline.modules.imagemagick_grayscale import ImageMagickGrayscale
-from imagepipeline.modules.registry import get_module
 from imagepipeline.modules.rembg import RembgModule
 from imagepipeline.utils.gmic import finalize_gmic_output, split_gmic_command
 from tests.conftest import make_png
@@ -124,7 +123,9 @@ class TestExpectedOutputFilenames:
 
 class TestPipelineResume:
     @pytest.mark.skipif(not shutil.which("magick"), reason="ImageMagick not installed")
-    def test_continue_skips_completed_steps(self, input_dir: Path, output_base: Path, capsys) -> None:
+    def test_continue_skips_completed_steps(
+        self, input_dir: Path, output_base: Path, capsys
+    ) -> None:
         with Pipeline(
             name="resume_test",
             input_dir=input_dir,
@@ -195,9 +196,7 @@ class TestPipelineResume:
             verbose=True,
             existing_outputs={"input_bokeh": external},
         ) as p:
-            reused = p.step(
-                "imagemagick_grayscale", inputs="input", step_id="input_bokeh"
-            )
+            reused = p.step("imagemagick_grayscale", inputs="input", step_id="input_bokeh")
             p.step("imagemagick_grayscale", inputs=reused)
             root = p.run()
 

tests/test_xcf_stack.py

@@ -119,9 +119,7 @@ def _make_stack_fixture(tmp_path: Path) -> dict[str, Path]:
 
 class TestXcfStackRun:
     @patch("imagepipeline.modules.xcf_stack.stack_images_to_xcf")
-    def test_collects_layers_from_explicit_inputs(
-        self, mock_stack: object, tmp_path: Path
-    ) -> None:
+    def test_collects_layers_from_explicit_inputs(self, mock_stack: object, tmp_path: Path) -> None:
         paths = _make_stack_fixture(tmp_path)
         input_path = paths["root"] / "refs" / "photo.jpg"
         input_path.parent.mkdir()
@@ -152,9 +150,7 @@ class TestXcfStackRun:
         ]
 
     @patch("imagepipeline.modules.xcf_stack.stack_images_to_xcf")
-    def test_skip_missing_true_skips_missing_step(
-        self, mock_stack: object, tmp_path: Path
-    ) -> None:
+    def test_skip_missing_true_skips_missing_step(self, mock_stack: object, tmp_path: Path) -> None:
         paths = _make_stack_fixture(tmp_path)
         (paths["step_b"] / "photo.png").unlink()
         input_path = paths["root"] / "photo.jpg"