Don't write back stdin to stdout when --check is passed

diff --git a/black.py b/black.py
index 203fbfa9055be595a358e94bd1c16b9a3911f23f..54044a5f564630289d7236e95fa0548d0049342b 100644 (file)
--- a/black.py
+++ b/black.py
@@ -102,7 +102,9 @@ def main(
         report = Report()
         try:
             if not p.is_file() and str(p) == '-':
-                changed = format_stdin_to_stdout(line_length=line_length, fast=fast)
+                changed = format_stdin_to_stdout(
+                    line_length=line_length, fast=fast, write_back=not check
+                )
             else:
                 changed = format_file_in_place(
                     p, line_length=line_length, fast=fast, write_back=not check
@@ -178,7 +180,9 @@ def format_file_in_place(
     return True
 
 
-def format_stdin_to_stdout(line_length: int, fast: bool) -> bool:
+def format_stdin_to_stdout(
+    line_length: int, fast: bool, write_back: bool = False
+) -> bool:
     """Format file on stdin and pipe output to stdout. Return True if changed."""
     contents = sys.stdin.read()
     try:
@@ -189,7 +193,8 @@ def format_stdin_to_stdout(line_length: int, fast: bool) -> bool:
         return False
 
     finally:
-        sys.stdout.write(contents)
+        if write_back:
+            sys.stdout.write(contents)
 
 
 def format_file_contents(

diff --git a/tests/test_black.py b/tests/test_black.py
index ee883ec011d1be2ea9015cc48fdbe95843a358e4..7dba611141c099e9054421f55bd371ac242fced3 100644 (file)
--- a/tests/test_black.py
+++ b/tests/test_black.py
@@ -89,7 +89,7 @@ class BlackTestCase(unittest.TestCase):
         try:
             sys.stdin, sys.stdout = StringIO(source), StringIO()
             sys.stdin.name = '<stdin>'
-            black.format_stdin_to_stdout(line_length=ll, fast=True)
+            black.format_stdin_to_stdout(line_length=ll, fast=True, write_back=True)
             sys.stdout.seek(0)
             actual = sys.stdout.read()
         finally: