lfcr.py 640 Bytes
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#! /usr/bin/env python3
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"Replace LF with CRLF in argument files.  Print names of changed files."

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import sys, re, os
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def main():
    for filename in sys.argv[1:]:
        if os.path.isdir(filename):
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            print(filename, "Directory!")
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            continue
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        with open(filename, "rb") as f:
            data = f.read()
        if b'\0' in data:
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            print(filename, "Binary!")
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            continue
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        newdata = re.sub(b"\r?\n", b"\r\n", data)
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        if newdata != data:
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            print(filename)
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            with open(filename, "wb") as f:
                f.write(newdata)
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if __name__ == '__main__':
    main()