Revert "Merge pull request #2870 from webknjaz/maintenance/fail-loudl…

…y-on-invalid-summary" This reverts commit 77678ab, reversing changes made to f2de347. Fixes #2893.
pypa · Nov 29, 2021 · 68795af · 68795af
1 parent ac88873
commit 68795af
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diff --git a/changelog.d/2893.change.rst b/changelog.d/2893.change.rst
@@ -0,0 +1 @@
+Restore deprecated support for newlines in the Summary field.
diff --git a/setuptools/dist.py b/setuptools/dist.py
@@ -145,11 +145,11 @@ def read_pkg_file(self, file):
 
 
 def single_line(val):
-    """Validate that the value does not have line breaks."""
-    # Ref: https://github.com/pypa/setuptools/issues/1390
+    # quick and dirty validation for description pypa/setuptools#1390
     if '\n' in val:
-        raise ValueError('Newlines are not allowed')
-
+        # TODO after 2021-07-31: Replace with `raise ValueError("newlines not allowed")`
+        warnings.warn("newlines not allowed and will break in the future")
+        val = val.replace('\n', ' ')
     return val