Add new byte-order-marker checker/fixer
diff --git a/pre_commit_hooks/fix_byte_order_marker.py b/pre_commit_hooks/fix_byte_order_marker.py
new file mode 100644
index 0000000..1ffe047
--- /dev/null
+++ b/pre_commit_hooks/fix_byte_order_marker.py
@@ -0,0 +1,30 @@
+import argparse
+from typing import Optional
+from typing import Sequence
+
+
+def main(argv: Optional[Sequence[str]] = None) -> int:
+ parser = argparse.ArgumentParser()
+ parser.add_argument('filenames', nargs='*', help='Filenames to check')
+ args = parser.parse_args(argv)
+
+ retv = 0
+
+ for filename in args.filenames:
+ with open(filename, 'rb') as f_b:
+ bts = f_b.read(3)
+
+ if bts == b'\xef\xbb\xbf':
+ with open(filename, newline='', encoding='utf-8-sig') as f:
+ contents = f.read()
+ with open(filename, 'w', newline='', encoding='utf-8') as f:
+ f.write(contents)
+
+ print(f'{filename}: removed byte-order marker')
+ retv = 1
+
+ return retv
+
+
+if __name__ == '__main__':
+ exit(main())
