Vim plugin: prefix messages with "Black: " (#3194)

[etc/vim.git] / src / black / trans.py

diff --git a/src/black/trans.py b/src/black/trans.py
index 01aa80eaaf84760f765ae34eef651d7336e28c09..dc9c5520d5bdfcaf7e56bd8c93fae537e779f0ed 100644 (file)
--- a/src/black/trans.py
+++ b/src/black/trans.py
@@ -1,10 +1,11 @@
 """
 String transformers that can split and merge strings.
 """
+import re
+import sys
 from abc import ABC, abstractmethod
 from collections import defaultdict
 from dataclasses import dataclass
-import re
 from typing import (
     Any,
     Callable,
@@ -21,29 +22,38 @@ from typing import (
     TypeVar,
     Union,
 )
-import sys
 
 if sys.version_info < (3, 8):
-    from typing_extensions import Literal, Final
+    from typing_extensions import Final, Literal
 else:
     from typing import Literal, Final
 
 from mypy_extensions import trait
 
-from black.rusty import Result, Ok, Err
-
-from black.mode import Feature
-from black.nodes import syms, replace_child, parent_type
-from black.nodes import is_empty_par, is_empty_lpar, is_empty_rpar
-from black.nodes import OPENING_BRACKETS, CLOSING_BRACKETS, STANDALONE_COMMENT
-from black.lines import Line, append_leaves
 from black.brackets import BracketMatchError
 from black.comments import contains_pragma_comment
-from black.strings import has_triple_quotes, get_string_prefix, assert_is_leaf_string
-from black.strings import normalize_string_quotes
-
-from blib2to3.pytree import Leaf, Node
+from black.lines import Line, append_leaves
+from black.mode import Feature
+from black.nodes import (
+    CLOSING_BRACKETS,
+    OPENING_BRACKETS,
+    STANDALONE_COMMENT,
+    is_empty_lpar,
+    is_empty_par,
+    is_empty_rpar,
+    parent_type,
+    replace_child,
+    syms,
+)
+from black.rusty import Err, Ok, Result
+from black.strings import (
+    assert_is_leaf_string,
+    get_string_prefix,
+    has_triple_quotes,
+    normalize_string_quotes,
+)
 from blib2to3.pgen2 import token
+from blib2to3.pytree import Leaf, Node
 
 
 class CannotTransform(Exception):
@@ -121,7 +131,7 @@ def hug_power_op(line: Line, features: Collection[Feature]) -> Iterator[Line]:
 
         return False
 
-    leaves: List[Leaf] = []
+    new_line = line.clone()
     should_hug = False
     for idx, leaf in enumerate(line.leaves):
         new_leaf = leaf.clone()
@@ -139,18 +149,14 @@ def hug_power_op(line: Line, features: Collection[Feature]) -> Iterator[Line]:
         if should_hug:
             new_leaf.prefix = ""
 
-        leaves.append(new_leaf)
-
-    yield Line(
-        mode=line.mode,
-        depth=line.depth,
-        leaves=leaves,
-        comments=line.comments,
-        bracket_tracker=line.bracket_tracker,
-        inside_brackets=line.inside_brackets,
-        should_split_rhs=line.should_split_rhs,
-        magic_trailing_comma=line.magic_trailing_comma,
-    )
+        # We have to be careful to make a new line properly:
+        # - bracket related metadata must be maintained (handled by Line.append)
+        # - comments need to copied over, updating the leaf IDs they're attached to
+        new_line.append(new_leaf, preformatted=True)
+        for comment_leaf in line.comments_after(leaf):
+            new_line.append(comment_leaf, preformatted=True)
+
+    yield new_line
 
 
 class StringTransformer(ABC):