54 lines
1.4 KiB
Python
54 lines
1.4 KiB
Python
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#!/usr/bin/env python3
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# Copyright (c) 2026, NVIDIA CORPORATION & AFFILIATES. ALL RIGHTS RESERVED.
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#
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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import re
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import sys
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def main() -> int:
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# We pre-compile this regular expression as a micro-optimization for speed. The
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# assumption is that the shebang is correct, so everything in the happy path should be
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# as fast as possible.
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FIRST_LINE_RE = re.compile(r"#!\s*/usr/bin/env.*")
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ret = 0
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for f in sys.argv[1:]:
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with open(f) as fd:
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first_line = fd.readline()
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if not first_line.startswith("#!"):
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# Not a shebang
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continue
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if FIRST_LINE_RE.match(first_line):
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# Already correct
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continue
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ret = 1
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if not (
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m := re.match(r"#!\s*(?:/bin/(\w+)|/usr/bin/(\w+))\s*(.*)", first_line)
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):
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# Not assert, pre-commit may compile with -O
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raise AssertionError(f"Failed to match shebang for {first_line}")
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fixed = f"#!/usr/bin/env {m[1] or m[2]}".rstrip()
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if rest := m[3].strip():
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fixed += f" {rest}"
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fixed += "\n"
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with open(f) as fd:
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# Read the remaining lines, we need them in order to overwrite
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lines = fd.readlines()
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lines[0] = fixed
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with open(f, "w") as fd:
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fd.writelines(lines)
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return ret
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if __name__ == "__main__":
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sys.exit(main())
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