Add black to pre-commit (#3192)

.pre-commit-config.yaml

@@ -46,5 +46,16 @@ repos:
         pass_filenames: false
         exclude: target
 
+  # Black
+  - repo: https://github.com/psf/black
+    rev: 23.1.0
+    hooks:
+      - id: black
+        exclude: |
+          (?x)^(
+            crates/ruff/resources/.*|
+            crates/ruff_python_formatter/resources/.*
+          )$
+
 ci:
   skip: [cargo-fmt, clippy, dev-generate-all]

scripts/add_plugin.py

@@ -95,7 +95,7 @@ mod tests {
     with (ROOT_DIR / "crates/ruff/src/codes.rs").open("r") as fp:
         while (line := next(fp)).strip() != "// ruff":
             text += line
-        text += " "*8 + f"// {plugin}\n"
+        text += " " * 8 + f"// {plugin}\n"
         text += line
         text += fp.read()
 

scripts/add_rule.py

@@ -140,7 +140,7 @@ pub fn {rule_name_snake}(checker: &mut Checker) {{}}
             text += line
         text += line
         linter_variant = pascal_case(linter)
-        text += " "*8 + f'({linter_variant}, "{code}") => Rule::{name},\n'
+        text += " " * 8 + f'({linter_variant}, "{code}") => Rule::{name},\n'
         text += fp.read()
 
     with (ROOT_DIR / "crates/ruff/src/codes.rs").open("w") as fp:

scripts/generate_known_standard_library.py

@@ -42,7 +42,7 @@ pub static KNOWN_STANDARD_LIBRARY: Lazy<FxHashMap<(u32, u32), FxHashSet<&'static
         FxHashMap::from_iter([
 """,
     )
-    for (major, minor) in VERSIONS:
+    for major, minor in VERSIONS:
         version = f"{major}.{minor}"
         url = URL.format(version)
         invdata = fetch_inventory(FakeApp(), "", url)