X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/8d6d92aa5b5248b5ff70ebf7977f8af5cbcb10b9..8c3c190f9978d08b8b6e505112a019a20cc9e6fc:/black.py

diff --git a/black.py b/black.py
index 2a913fc..2668747 100644
--- a/black.py
+++ b/black.py
@@ -2,7 +2,7 @@ import ast
 import asyncio
 from abc import ABC, abstractmethod
 from collections import defaultdict
-from concurrent.futures import Executor, ProcessPoolExecutor
+from concurrent.futures import Executor, ThreadPoolExecutor, ProcessPoolExecutor
 from contextlib import contextmanager
 from datetime import datetime
 from enum import Enum
@@ -613,12 +613,21 @@ def reformat_many(
     sources: Set[Path], fast: bool, write_back: WriteBack, mode: Mode, report: "Report"
 ) -> None:
     """Reformat multiple files using a ProcessPoolExecutor."""
+    executor: Executor
     loop = asyncio.get_event_loop()
     worker_count = os.cpu_count()
     if sys.platform == "win32":
         # Work around https://bugs.python.org/issue26903
         worker_count = min(worker_count, 61)
-    executor = ProcessPoolExecutor(max_workers=worker_count)
+    try:
+        executor = ProcessPoolExecutor(max_workers=worker_count)
+    except OSError:
+        # we arrive here if the underlying system does not support multi-processing
+        # like in AWS Lambda, in which case we gracefully fallback to
+        # a ThreadPollExecutor with just a single worker (more workers would not do us
+        # any good due to the Global Interpreter Lock)
+        executor = ThreadPoolExecutor(max_workers=1)
+
     try:
         loop.run_until_complete(
             schedule_formatting(
@@ -633,7 +642,8 @@ def reformat_many(
         )
     finally:
         shutdown(loop)
-        executor.shutdown()
+        if executor is not None:
+            executor.shutdown()
 
 
 async def schedule_formatting(
@@ -5224,7 +5234,7 @@ def generate_ignored_nodes(leaf: Leaf) -> Iterator[LN]:
     """
     container: Optional[LN] = container_of(leaf)
     while container is not None and container.type != token.ENDMARKER:
-        if fmt_on(container):
+        if is_fmt_on(container):
             return
 
         # fix for fmt: on in children
@@ -5238,17 +5248,21 @@ def generate_ignored_nodes(leaf: Leaf) -> Iterator[LN]:
             container = container.next_sibling
 
 
-def fmt_on(container: LN) -> bool:
-    is_fmt_on = False
+def is_fmt_on(container: LN) -> bool:
+    """Determine whether formatting is switched on within a container.
+    Determined by whether the last `# fmt:` comment is `on` or `off`.
+    """
+    fmt_on = False
     for comment in list_comments(container.prefix, is_endmarker=False):
         if comment.value in FMT_ON:
-            is_fmt_on = True
+            fmt_on = True
         elif comment.value in FMT_OFF:
-            is_fmt_on = False
-    return is_fmt_on
+            fmt_on = False
+    return fmt_on
 
 
 def contains_fmt_on_at_column(container: LN, column: int) -> bool:
+    """Determine if children at a given column have formatting switched on."""
     for child in container.children:
         if (
             isinstance(child, Node)
@@ -5256,13 +5270,14 @@ def contains_fmt_on_at_column(container: LN, column: int) -> bool:
             or isinstance(child, Leaf)
             and child.column == column
         ):
-            if fmt_on(child):
+            if is_fmt_on(child):
                 return True
 
     return False
 
 
 def first_leaf_column(node: Node) -> Optional[int]:
+    """Returns the column of the first leaf child of a node."""
     for child in node.children:
         if isinstance(child, Leaf):
             return child.column