Fixed #1469: --diff option is ignored when input is from stdin. Relea…

…se hot fix release 5.5.2

CHANGELOG.md

@@ -4,6 +4,9 @@ Changelog
 NOTE: isort follows the [semver](https://semver.org/) versioning standard.
 Find out more about isort's release policy [here](https://pycqa.github.io/isort/docs/major_releases/release_policy/).
 
+### 5.5.2 [Hotfix] September 9, 2020
+  - Fixed #1469: --diff option is ignored when input is from stdin.
+
 ### 5.5.1 September 4, 2020
   - Fixed #1454: Ensure indented import sections with import heading and a preceding comment don't cause import sorting loops.
   - Fixed #1453: isort error when float to top on almost empty file.

isort/_version.py

@@ -1 +1 @@
-__version__ = "5.5.1"
+__version__ = "5.5.2"

isort/main.py

@@ -836,6 +836,7 @@ def main(argv: Optional[Sequence[str]] = None, stdin: Optional[TextIOWrapper] =
             input_stream=sys.stdin if stdin is None else stdin,
             output_stream=sys.stdout,
             config=config,
+            show_diff=show_diff,
         )
     else:
         skipped: List[str] = []

pyproject.toml

@@ -3,7 +3,7 @@ line-length = 100
 
 [tool.poetry]
 name = "isort"
-version = "5.5.1"
+version = "5.5.2"
 description = "A Python utility / library to sort Python imports."
 authors = ["Timothy Crosley <timothy.crosley@gmail.com>"]
 license = "MIT"

tests/unit/test_main.py

@@ -165,6 +165,23 @@ def test_main(capsys, tmpdir):
 """
     )
 
+    # Should be able to stream diff
+    input_content = TextIOWrapper(
+        BytesIO(
+            b"""
+import b
+import a
+"""
+        )
+    )
+    main.main(config_args + ["-", "--diff"], stdin=input_content)
+    out, error = capsys.readouterr()
+    assert not error
+    assert "+" in out
+    assert "-" in out
+    assert "import a" in out
+    assert "import b" in out
+
     # Should be able to run with just a file
     python_file = tmpdir.join("has_imports.py")
     python_file.write(