Enforce valid py formatter option names

crates/ruff_python_formatter/resources/test/fixtures/black/cases/ignore_pyi.pyi

@@ -15,7 +15,6 @@ def g():
     # hi
     ...
 
-# FIXME(#8905): Uncomment, leads to unstable formatting
-# def h():
-#     ...
-#     # bye
+def h():
+    ...
+    # bye

crates/ruff_python_formatter/resources/test/fixtures/black/cases/line_ranges_fmt_off_decorator.py

@@ -9,3 +9,12 @@ class MyClass:
     # fmt: on
     def method():
         print   ( "str" )
+
+    @decor(
+        a=1,
+        # fmt: off
+        b=(2,   3),
+        # fmt: on
+    )
+    def func():
+          pass

crates/ruff_python_formatter/resources/test/fixtures/black/cases/line_ranges_fmt_off_decorator.py.expect

@@ -1,4 +1,4 @@
-# flags: --line-ranges=12-12
+# flags: --line-ranges=12-12 --line-ranges=21-21
 # NOTE: If you need to modify this file, pay special attention to the --line-ranges=
 # flag above as it's formatting specifically these lines.
 
@@ -10,3 +10,12 @@ class MyClass:
     # fmt: on
     def method():
         print("str")
+
+    @decor(
+        a=1,
+        # fmt: off
+        b=(2,   3),
+        # fmt: on
+    )
+    def func():
+        pass

crates/ruff_python_formatter/resources/test/fixtures/black/cases/linelength6.options.json

@@ -1 +1 @@
-{"line_length": 6}
+{"line_width": 6}

crates/ruff_python_formatter/resources/test/fixtures/black/cases/power_op_newline.options.json

@@ -1 +1 @@
-{"line_length": 0}
+{"line_width": 1}

crates/ruff_python_formatter/resources/test/fixtures/import_black_tests.py

@@ -48,7 +48,8 @@ def import_fixture(fixture: Path, fixture_set: str):
             if "--line-length=" in flags:
                 [_, length_and_rest] = flags.split("--line-length=", 1)
                 length = length_and_rest.split(" ", 1)[0]
-                options["line_length"] = int(length)
+                length = int(length)
+                options["line_width"] = 1 if length == 0 else length
 
             if "--skip-magic-trailing-comma" in flags:
                 options["magic_trailing_comma"] = "ignore"

crates/ruff_python_formatter/src/options.rs

@@ -11,7 +11,7 @@ use std::str::FromStr;
 #[cfg_attr(
     feature = "serde",
     derive(serde::Serialize, serde::Deserialize),
-    serde(default)
+    serde(default, deny_unknown_fields)
 )]
 pub struct PyFormatOptions {
     /// Whether we're in a `.py` file or `.pyi` file, which have different rules.

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__ignore_pyi.pyi.snap

@@ -22,10 +22,9 @@ def g():
     # hi
     ...
 
-# FIXME(#8905): Uncomment, leads to unstable formatting
-# def h():
-#     ...
-#     # bye
+def h():
+    ...
+    # bye
 ```
 
 ## Black Differences
@@ -41,17 +40,6 @@ def g():
  class y: ...  # comment
  
  # whitespace doesn't matter (note the next line has a trailing space and tab)
-@@ -13,6 +12,7 @@
-     # hi
-     ...
- 
--def h():
--    ...
--    # bye
-+# FIXME(#8905): Uncomment, leads to unstable formatting
-+# def h():
-+#     ...
-+#     # bye
 ```
 
 ## Ruff Output
@@ -71,10 +59,9 @@ def g():
     # hi
     ...
 
-# FIXME(#8905): Uncomment, leads to unstable formatting
-# def h():
-#     ...
-#     # bye
+def h():
+    ...
+    # bye
 ```
 
 ## Black Output

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__line_ranges_fmt_off_decorator.py.snap

@@ -16,15 +16,24 @@ class MyClass:
     # fmt: on
     def method():
         print   ( "str" )
+
+    @decor(
+        a=1,
+        # fmt: off
+        b=(2,   3),
+        # fmt: on
+    )
+    def func():
+          pass
 ```
 
 ## Black Differences
 
 ```diff
 --- Black
 +++ Ruff
-@@ -1,12 +1,10 @@
--# flags: --line-ranges=12-12
+@@ -1,15 +1,13 @@
+-# flags: --line-ranges=12-12 --line-ranges=21-21
  # NOTE: If you need to modify this file, pay special attention to the --line-ranges=
  # flag above as it's formatting specifically these lines.
  
@@ -37,6 +46,15 @@ class MyClass:
      def method():
 -        print("str")
 +        print   ( "str" )
+ 
+     @decor(
+         a=1,
+@@ -18,4 +16,4 @@
+         # fmt: on
+     )
+     def func():
+-        pass
++          pass
 ```
 
 ## Ruff Output
@@ -52,12 +70,21 @@ class MyClass:
     # fmt: on
     def method():
         print   ( "str" )
+
+    @decor(
+        a=1,
+        # fmt: off
+        b=(2,   3),
+        # fmt: on
+    )
+    def func():
+          pass
 ```
 
 ## Black Output
 
 ```python
-# flags: --line-ranges=12-12
+# flags: --line-ranges=12-12 --line-ranges=21-21
 # NOTE: If you need to modify this file, pay special attention to the --line-ranges=
 # flag above as it's formatting specifically these lines.
 
@@ -69,6 +96,15 @@ class MyClass:
     # fmt: on
     def method():
         print("str")
+
+    @decor(
+        a=1,
+        # fmt: off
+        b=(2,   3),
+        # fmt: on
+    )
+    def func():
+        pass
 ```
 
 

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__power_op_newline.py.snap

@@ -13,21 +13,24 @@ importA;()<<0**0#
 ```diff
 --- Black
 +++ Ruff
-@@ -1,6 +1,2 @@
- importA
--(
--    ()
--    << 0
+@@ -2,5 +2,5 @@
+ (
+     ()
+     << 0
 -    ** 0
--)  #
-+() << 0**0  #
++    **0
+ )  #
 ```
 
 ## Ruff Output
 
 ```python
 importA
-() << 0**0  #
+(
+    ()
+    << 0
+    **0
+)  #
 ```
 
 ## Black Output