ruff rules B904 and PLW1510

pyproject.toml

@@ -88,14 +88,12 @@ extend-select = [
 ]
 ignore = [
   "B023",        # Function definition does not bind loop variable
-  "B904",        # Raise exception with `raise ... from err`
-  "PLW1510",     # `subprocess.run` without explicit `check` argument
   "T201",        # Print statements
-  "ISC001",      # Conflicts with the formatter in 0.1.2
+  "ISC001",      # Conflicts with ruff format
 ]
 unfixable = [
-  "F841", # Removes unused variables
-  "T20",  # Removes print statements
+  "F841",        # Removes unused variables
+  "T20",         # Removes print statements
 ]
 
 [tool.ruff.lint.mccabe]

removestar/removestar.py

@@ -61,7 +61,7 @@ def fix_code(
     try:
         tree = ast.parse(code, filename=file)
     except SyntaxError as e:
-        raise RuntimeError(f"SyntaxError: {e}")
+        raise RuntimeError(f"SyntaxError: {e}") from e
 
     checker = Checker(tree)
 
@@ -352,24 +352,24 @@ def get_module_names(mod, directory, *, allow_dynamic=True, _found=()):
     """
     try:
         names = get_names_from_dir(mod, directory, allow_dynamic=allow_dynamic, _found=_found)
-    except ExternalModuleError:
+    except ExternalModuleError as e:
         if allow_dynamic:
             names = get_names_dynamically(mod)
         else:
             raise NotImplementedError(
                 "Static determination of external module imports is not supported."
-            )
+            ) from e
     return names
 
 
 def get_names_dynamically(mod):
     d = {}
     try:
         exec(f"from {mod} import *", d)
-    except ImportError:
-        raise RuntimeError(f"Could not import {mod}")
+    except ImportError as import_e:
+        raise RuntimeError(f"Could not import {mod}") from import_e
     except Exception as e:
-        raise RuntimeError(f"Error importing {mod}: {e}")
+        raise RuntimeError(f"Error importing {mod}: {e}") from e
     return d.keys() - set(MAGIC_GLOBALS)
 
 
@@ -382,9 +382,9 @@ def get_names_from_dir(mod, directory, *, allow_dynamic=True, _found=()):
     try:
         names = get_names(code, filename)
     except SyntaxError as e:
-        raise RuntimeError(f"Could not parse {filename}: {e}")
-    except RuntimeError:
-        raise RuntimeError(f"Could not parse the names from {filename}")
+        raise RuntimeError(f"Could not parse {filename}: {e}") from e
+    except RuntimeError as runtime_e:
+        raise RuntimeError(f"Could not parse the names from {filename}") from runtime_e
 
     for name in names.copy():
         if name.endswith(".*"):

tests/test_removestar.py

@@ -1527,6 +1527,7 @@ def test_cli(tmpdir):
         [sys.executable, "-m", "removestar", "--_this-file", "none"],
         capture_output=True,
         encoding="utf-8",
+        check=False,
     )
     assert p.stderr == ""
     assert p.stdout == __file__
@@ -1535,6 +1536,7 @@ def test_cli(tmpdir):
         [sys.executable, "-m", "removestar", directory],
         capture_output=True,
         encoding="utf-8",
+        check=False,
     )
     warnings = set(
         f"""\
@@ -1688,6 +1690,7 @@ def func():
         [sys.executable, "-m", "removestar", "--quiet", directory],
         capture_output=True,
         encoding="utf-8",
+        check=False,
     )
     assert p.stderr == ""
     for d in diffs:
@@ -1699,6 +1702,7 @@ def func():
         [sys.executable, "-m", "removestar", "--verbose", directory],
         capture_output=True,
         encoding="utf-8",
+        check=False,
     )
     changes = set(
         f"""\
@@ -1736,6 +1740,7 @@ def func():
         [sys.executable, "-m", "removestar", "--no-dynamic-importing", directory],
         capture_output=True,
         encoding="utf-8",
+        check=False,
     )
     static_error = set(
         f"""\
@@ -1765,6 +1770,7 @@ def func():
         ],
         capture_output=True,
         encoding="utf-8",
+        check=False,
     )
     assert p.stderr == ""
     for d in diffs:
@@ -1780,6 +1786,7 @@ def func():
         [sys.executable, "-m", "removestar", "--quiet", "-i", directory],
         capture_output=True,
         encoding="utf-8",
+        check=False,
     )
     assert p.stderr == ""
     assert p.stdout == ""
@@ -1832,6 +1839,7 @@ def func():
         [sys.executable, "-m", "removestar", directory / "notarealfile.py"],
         capture_output=True,
         encoding="utf-8",
+        check=False,
     )
     assert p.stderr == red(f"Error: {directory}/notarealfile.py: no such file or directory") + "\n"
     assert p.stdout == ""