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296 lines
9.3 KiB
Python
296 lines
9.3 KiB
Python
2 years ago
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import argparse
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import sys
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from json import dumps
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from os.path import abspath
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from platform import python_version
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from typing import List, Optional
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try:
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from unicodedata2 import unidata_version
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except ImportError:
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from unicodedata import unidata_version
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from charset_normalizer import from_fp
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from charset_normalizer.models import CliDetectionResult
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from charset_normalizer.version import __version__
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def query_yes_no(question: str, default: str = "yes") -> bool:
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"""Ask a yes/no question via input() and return their answer.
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"question" is a string that is presented to the user.
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"default" is the presumed answer if the user just hits <Enter>.
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It must be "yes" (the default), "no" or None (meaning
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an answer is required of the user).
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The "answer" return value is True for "yes" or False for "no".
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Credit goes to (c) https://stackoverflow.com/questions/3041986/apt-command-line-interface-like-yes-no-input
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"""
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valid = {"yes": True, "y": True, "ye": True, "no": False, "n": False}
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if default is None:
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prompt = " [y/n] "
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elif default == "yes":
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prompt = " [Y/n] "
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elif default == "no":
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prompt = " [y/N] "
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else:
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raise ValueError("invalid default answer: '%s'" % default)
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while True:
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sys.stdout.write(question + prompt)
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choice = input().lower()
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if default is not None and choice == "":
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return valid[default]
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elif choice in valid:
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return valid[choice]
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else:
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sys.stdout.write("Please respond with 'yes' or 'no' " "(or 'y' or 'n').\n")
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def cli_detect(argv: Optional[List[str]] = None) -> int:
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"""
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CLI assistant using ARGV and ArgumentParser
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:param argv:
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:return: 0 if everything is fine, anything else equal trouble
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"""
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parser = argparse.ArgumentParser(
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description="The Real First Universal Charset Detector. "
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"Discover originating encoding used on text file. "
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"Normalize text to unicode."
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)
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parser.add_argument(
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"files", type=argparse.FileType("rb"), nargs="+", help="File(s) to be analysed"
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)
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parser.add_argument(
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"-v",
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"--verbose",
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action="store_true",
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default=False,
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dest="verbose",
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help="Display complementary information about file if any. "
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"Stdout will contain logs about the detection process.",
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)
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parser.add_argument(
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"-a",
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"--with-alternative",
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action="store_true",
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default=False,
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dest="alternatives",
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help="Output complementary possibilities if any. Top-level JSON WILL be a list.",
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)
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parser.add_argument(
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"-n",
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"--normalize",
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action="store_true",
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default=False,
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dest="normalize",
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help="Permit to normalize input file. If not set, program does not write anything.",
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)
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parser.add_argument(
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"-m",
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"--minimal",
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action="store_true",
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default=False,
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dest="minimal",
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help="Only output the charset detected to STDOUT. Disabling JSON output.",
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)
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parser.add_argument(
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"-r",
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"--replace",
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action="store_true",
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default=False,
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dest="replace",
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help="Replace file when trying to normalize it instead of creating a new one.",
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)
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parser.add_argument(
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"-f",
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"--force",
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action="store_true",
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default=False,
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dest="force",
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help="Replace file without asking if you are sure, use this flag with caution.",
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)
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parser.add_argument(
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"-t",
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"--threshold",
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action="store",
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default=0.2,
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type=float,
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dest="threshold",
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help="Define a custom maximum amount of chaos allowed in decoded content. 0. <= chaos <= 1.",
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)
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parser.add_argument(
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"--version",
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action="version",
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version="Charset-Normalizer {} - Python {} - Unicode {}".format(
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__version__, python_version(), unidata_version
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),
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help="Show version information and exit.",
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)
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args = parser.parse_args(argv)
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if args.replace is True and args.normalize is False:
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print("Use --replace in addition of --normalize only.", file=sys.stderr)
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return 1
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if args.force is True and args.replace is False:
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print("Use --force in addition of --replace only.", file=sys.stderr)
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return 1
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if args.threshold < 0.0 or args.threshold > 1.0:
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print("--threshold VALUE should be between 0. AND 1.", file=sys.stderr)
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return 1
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x_ = []
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for my_file in args.files:
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matches = from_fp(my_file, threshold=args.threshold, explain=args.verbose)
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best_guess = matches.best()
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if best_guess is None:
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print(
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'Unable to identify originating encoding for "{}". {}'.format(
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my_file.name,
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"Maybe try increasing maximum amount of chaos."
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if args.threshold < 1.0
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else "",
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),
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file=sys.stderr,
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)
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x_.append(
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CliDetectionResult(
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abspath(my_file.name),
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None,
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[],
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[],
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"Unknown",
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[],
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False,
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1.0,
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0.0,
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None,
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True,
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)
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)
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else:
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x_.append(
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CliDetectionResult(
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abspath(my_file.name),
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best_guess.encoding,
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best_guess.encoding_aliases,
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[
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cp
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for cp in best_guess.could_be_from_charset
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if cp != best_guess.encoding
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],
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best_guess.language,
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best_guess.alphabets,
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best_guess.bom,
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best_guess.percent_chaos,
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best_guess.percent_coherence,
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None,
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True,
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)
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)
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if len(matches) > 1 and args.alternatives:
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for el in matches:
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if el != best_guess:
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x_.append(
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CliDetectionResult(
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abspath(my_file.name),
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el.encoding,
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el.encoding_aliases,
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[
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cp
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for cp in el.could_be_from_charset
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if cp != el.encoding
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],
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el.language,
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el.alphabets,
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el.bom,
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el.percent_chaos,
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el.percent_coherence,
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None,
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False,
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)
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)
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if args.normalize is True:
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if best_guess.encoding.startswith("utf") is True:
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print(
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'"{}" file does not need to be normalized, as it already came from unicode.'.format(
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my_file.name
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),
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file=sys.stderr,
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)
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if my_file.closed is False:
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my_file.close()
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continue
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o_: List[str] = my_file.name.split(".")
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if args.replace is False:
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o_.insert(-1, best_guess.encoding)
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if my_file.closed is False:
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my_file.close()
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elif (
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args.force is False
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and query_yes_no(
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'Are you sure to normalize "{}" by replacing it ?'.format(
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my_file.name
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),
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"no",
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)
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is False
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):
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if my_file.closed is False:
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my_file.close()
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continue
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try:
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x_[0].unicode_path = abspath("./{}".format(".".join(o_)))
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with open(x_[0].unicode_path, "w", encoding="utf-8") as fp:
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fp.write(str(best_guess))
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except IOError as e:
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print(str(e), file=sys.stderr)
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if my_file.closed is False:
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my_file.close()
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return 2
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if my_file.closed is False:
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my_file.close()
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if args.minimal is False:
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print(
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dumps(
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[el.__dict__ for el in x_] if len(x_) > 1 else x_[0].__dict__,
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ensure_ascii=True,
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indent=4,
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)
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)
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else:
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for my_file in args.files:
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print(
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", ".join(
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[
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el.encoding or "undefined"
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for el in x_
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if el.path == abspath(my_file.name)
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]
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)
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)
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return 0
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if __name__ == "__main__":
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cli_detect()
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