From 268dcb677ce80331e0ef104d8335c2ada32872fb Mon Sep 17 00:00:00 2001
From: "Yilei \"Dolee\" Yang" <yileiyang@google.com>
Date: Fri, 17 Mar 2023 21:39:21 -0700
Subject: [PATCH] Do not add an extra blank line to an import line that has fmt
 disabled (#3610)

---
 CHANGES.md                                 |  3 +++
 src/black/comments.py                      |  1 +
 src/black/lines.py                         | 21 +++++++++++++++++++++
 src/blib2to3/pytree.py                     |  6 ++++++
 tests/data/simple_cases/fmtonoff.py        |  1 -
 tests/data/simple_cases/fmtpass_imports.py | 19 +++++++++++++++++++
 6 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 tests/data/simple_cases/fmtpass_imports.py

diff --git a/CHANGES.md b/CHANGES.md
index eff2640..06a0ab7 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -10,6 +10,9 @@
 
 <!-- Changes that affect Black's stable style -->
 
+- Import lines with `# fmt: skip` and `# fmt: off` no longer have an extra blank line
+  added when they are right after another import line (#3610)
+
 ### Preview style
 
 <!-- Changes that affect Black's preview style -->
diff --git a/src/black/comments.py b/src/black/comments.py
index 7cf15bf..619123a 100644
--- a/src/black/comments.py
+++ b/src/black/comments.py
@@ -203,6 +203,7 @@ def convert_one_fmt_off_pair(node: Node) -> bool:
                     STANDALONE_COMMENT,
                     hidden_value,
                     prefix=standalone_comment_prefix,
+                    fmt_pass_converted_first_leaf=first_leaf_of(first),
                 ),
             )
             return True
diff --git a/src/black/lines.py b/src/black/lines.py
index 329dfc4..66bba14 100644
--- a/src/black/lines.py
+++ b/src/black/lines.py
@@ -195,6 +195,26 @@ class Line:
             return False
         return self.leaves[-1].type == token.COLON
 
+    def is_fmt_pass_converted(
+        self, *, first_leaf_matches: Optional[Callable[[Leaf], bool]] = None
+    ) -> bool:
+        """Is this line converted from fmt off/skip code?
+
+        If first_leaf_matches is not None, it only returns True if the first
+        leaf of converted code matches.
+        """
+        if len(self.leaves) != 1:
+            return False
+        leaf = self.leaves[0]
+        if (
+            leaf.type != STANDALONE_COMMENT
+            or leaf.fmt_pass_converted_first_leaf is None
+        ):
+            return False
+        return first_leaf_matches is None or first_leaf_matches(
+            leaf.fmt_pass_converted_first_leaf
+        )
+
     def contains_standalone_comments(self, depth_limit: int = sys.maxsize) -> bool:
         """If so, needs to be split before emitting."""
         for leaf in self.leaves:
@@ -597,6 +617,7 @@ class EmptyLineTracker:
             self.previous_line
             and self.previous_line.is_import
             and not current_line.is_import
+            and not current_line.is_fmt_pass_converted(first_leaf_matches=is_import)
             and depth == self.previous_line.depth
         ):
             return (before or 1), 0
diff --git a/src/blib2to3/pytree.py b/src/blib2to3/pytree.py
index 15a1420..ea60c89 100644
--- a/src/blib2to3/pytree.py
+++ b/src/blib2to3/pytree.py
@@ -392,6 +392,10 @@ class Leaf(Base):
     _prefix = ""  # Whitespace and comments preceding this token in the input
     lineno: int = 0  # Line where this token starts in the input
     column: int = 0  # Column where this token starts in the input
+    # If not None, this Leaf is created by converting a block of fmt off/skip
+    # code, and `fmt_pass_converted_first_leaf` points to the first Leaf in the
+    # converted code.
+    fmt_pass_converted_first_leaf: Optional["Leaf"] = None
 
     def __init__(
         self,
@@ -401,6 +405,7 @@ class Leaf(Base):
         prefix: Optional[Text] = None,
         fixers_applied: List[Any] = [],
         opening_bracket: Optional["Leaf"] = None,
+        fmt_pass_converted_first_leaf: Optional["Leaf"] = None,
     ) -> None:
         """
         Initializer.
@@ -419,6 +424,7 @@ class Leaf(Base):
         self.fixers_applied: Optional[List[Any]] = fixers_applied[:]
         self.children = []
         self.opening_bracket = opening_bracket
+        self.fmt_pass_converted_first_leaf = fmt_pass_converted_first_leaf
 
     def __repr__(self) -> str:
         """Return a canonical string representation."""
diff --git a/tests/data/simple_cases/fmtonoff.py b/tests/data/simple_cases/fmtonoff.py
index e40ea2c..d1f15cd 100644
--- a/tests/data/simple_cases/fmtonoff.py
+++ b/tests/data/simple_cases/fmtonoff.py
@@ -195,7 +195,6 @@ import sys
 from third_party import X, Y, Z
 
 from library import some_connection, some_decorator
-
 # fmt: off
 from third_party import (X,
                          Y, Z)
diff --git a/tests/data/simple_cases/fmtpass_imports.py b/tests/data/simple_cases/fmtpass_imports.py
new file mode 100644
index 0000000..8b3c0bc
--- /dev/null
+++ b/tests/data/simple_cases/fmtpass_imports.py
@@ -0,0 +1,19 @@
+# Regression test for https://github.com/psf/black/issues/3438
+
+import ast
+import collections  # fmt: skip
+import dataclasses
+# fmt: off
+import os
+# fmt: on
+import pathlib
+
+import re  # fmt: skip
+import secrets
+
+# fmt: off
+import sys
+# fmt: on
+
+import tempfile
+import zoneinfo
-- 
2.39.2