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Allow specifying `--workers` via environment variable (#3743)
[etc/vim.git] / src / black / concurrency.py
diff --git a/src/black/concurrency.py b/src/black/concurrency.py
index 1598f51e43f5a08b4ed428ebb15413798a0e3991..893eba6675a738a7b1eab2471075caa87130430a 100644 (file)
--- a/src/black/concurrency.py
+++ b/src/black/concurrency.py
@@ -80,7 +80,8 @@ 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)
vim configuration

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