Fix grammar for type alias support (#3949)

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

diff --git a/src/black/concurrency.py b/src/black/concurrency.py
index 1598f51e43f5a08b4ed428ebb15413798a0e3991..55c96b66c86e14fb4fb4b2a8f5aef54aa0e34dd3 100644 (file)
--- a/src/black/concurrency.py
+++ b/src/black/concurrency.py
@@ -9,6 +9,7 @@ import logging
 import os
 import signal
 import sys
+import traceback
 from concurrent.futures import Executor, ProcessPoolExecutor, ThreadPoolExecutor
 from multiprocessing import Manager
 from pathlib import Path
@@ -17,7 +18,7 @@ from typing import Any, Iterable, Optional, Set
 from mypy_extensions import mypyc_attr
 
 from black import WriteBack, format_file_in_place
-from black.cache import Cache, filter_cached, read_cache, write_cache
+from black.cache import Cache
 from black.mode import Mode
 from black.output import err
 from black.report import Changed, Report
@@ -80,7 +81,8 @@ def reformat_many(
 
     executor: Executor
     if workers is None:
-        workers = os.cpu_count() or 1
+        workers = int(os.environ.get("BLACK_NUM_WORKERS", 0))
+        workers = workers or os.cpu_count() or 1
     if sys.platform == "win32":
         # Work around https://bugs.python.org/issue26903
         workers = min(workers, 60)
@@ -132,10 +134,9 @@ async def schedule_formatting(
     `write_back`, `fast`, and `mode` options are passed to
     :func:`format_file_in_place`.
     """
-    cache: Cache = {}
+    cache = Cache.read(mode)
     if write_back not in (WriteBack.DIFF, WriteBack.COLOR_DIFF):
-        cache = read_cache(mode)
-        sources, cached = filter_cached(cache, sources)
+        sources, cached = cache.filtered_cached(sources)
         for src in sorted(cached):
             report.done(src, Changed.CACHED)
     if not sources:
@@ -170,8 +171,10 @@ async def schedule_formatting(
             src = tasks.pop(task)
             if task.cancelled():
                 cancelled.append(task)
-            elif task.exception():
-                report.failed(src, str(task.exception()))
+            elif exc := task.exception():
+                if report.verbose:
+                    traceback.print_exception(type(exc), exc, exc.__traceback__)
+                report.failed(src, str(exc))
             else:
                 changed = Changed.YES if task.result() else Changed.NO
                 # If the file was written back or was successfully checked as
@@ -184,4 +187,4 @@ async def schedule_formatting(
     if cancelled:
         await asyncio.gather(*cancelled, return_exceptions=True)
     if sources_to_cache:
-        write_cache(cache, sources_to_cache, mode)
+        cache.write(sources_to_cache)