BUG: Exit with status 0 even if stdin closes abruptly

Discovered with:

    diff-logs < file.log | head -n 2

Author: kernc

diff-logs.py

@@ -54,4 +54,7 @@
 for line in sys.stdin:
     for pattern, replacement in PATTERNS.items():
         line = re.sub(pattern, replacement, line)
-    print(line, end='')
+    try:
+        print(line, end='')
+    except BrokenPipeError:
+        break