Move to preview

CHANGES.md

@@ -11,13 +11,14 @@
 <!-- Changes that affect Black's stable style -->
 
 - Don't move comments along with delimiters, which could cause crashes (#4248)
-- Fixed a bug where `if` clauses in `match-case` blocks are not wrapped with parenthesis
-  when the line is too long (#4269)
 
 ### Preview style
 
 <!-- Changes that affect Black's preview style -->
 
+- Fixed a bug where `if` clauses in `match-case` blocks are not wrapped with parenthesis
+  when the line is too long (#4269)
+
 ### Configuration
 
 <!-- Changes to how Black can be configured -->

docs/the_black_code_style/future_style.md

@@ -34,6 +34,8 @@ Currently, the following features are included in the preview style:
   quotes of a docstring
 - `remove_redundant_guard_parens`: Removes redundant parentheses in `if` guards for
   `case` blocks.
+- `parens_for_long_if_clauses_in_case_block`: Fixed a bug where `if` clauses in
+  `match-case` blocks are not wrapped with parenthesis when the line is too long
 
 (labels/unstable-features)=
 

src/black/linegen.py

@@ -1311,8 +1311,12 @@ def normalize_invisible_parens(  # noqa: C901
             )
 
         # Fixes a bug where invisible parens are not properly wrapped around
-        # if statement.
-        if isinstance(child, Node) and child.type == syms.guard:
+        # if statement when line is too long.
+        if (
+            isinstance(child, Node)
+            and child.type == syms.guard
+            and Preview.parens_for_long_if_clauses_in_case_block in mode
+        ):
             normalize_invisible_parens(
                 child, parens_after={"if"}, mode=mode, features=features
             )

src/black/mode.py

@@ -180,6 +180,7 @@ class Preview(Enum):
     is_simple_lookup_for_doublestar_expression = auto()
     docstring_check_for_newline = auto()
     remove_redundant_guard_parens = auto()
+    parens_for_long_if_clauses_in_case_block = auto()
 
 
 UNSTABLE_FEATURES: Set[Preview] = {

src/black/resources/black.schema.json

@@ -88,7 +88,8 @@
           "typed_params_trailing_comma",
           "is_simple_lookup_for_doublestar_expression",
           "docstring_check_for_newline",
-          "remove_redundant_guard_parens"
+          "remove_redundant_guard_parens",
+          "parens_for_long_if_clauses_in_case_block"
         ]
       },
       "description": "Enable specific features included in the `--unstable` style. Requires `--preview`. No compatibility guarantees are provided on the behavior or existence of any unstable features."

tests/data/cases/pattern_matching_with_if_stmt.py

@@ -1,4 +1,4 @@
-# flags: --minimum-version=3.10
+# flags: --preview --minimum-version=3.10
 match "test":
     case "test" if "first long condition" != "some loooooooooooooooooooooooooooooooooooooog condition":
         print("Test")