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#! /usr/bin/python
# -*- coding: utf-8 -*-

# bin/chardet
# Part of chardet, the Universal Encoding Detector.
#
# Copyright © 2008–2009 Ben Finney <ben+python@benfinney.id.au>
#
# This is free software; you may copy, modify and/or distribute this
# work under the terms of the GNU Lesser General Public License;
# either version 2.1 or, at your option, any later version.
# No warranty expressed or implied. See the file COPYING for details.

""" %prog [options] [file ...]

Report heuristically-detected character encoding for each file.

For every specified file (defaulting to stdin if no files are
specified), reads and determines the character encoding of the file
content. Reports the name and confidence level for each file's
detected character encoding.
"""

import sys
import optparse
import chardet


class OptionParser(optparse.OptionParser, object):
    """ Command-line parser for this program """

    def __init__(self, *args, **kwargs):
        """ Set up a new instance """
        super(OptionParser, self).__init__(*args, **kwargs)

        global __doc__
        self.usage = __doc__.strip()


def detect_encoding(in_file):
    """ Detect encoding of text in `in_file`

        Parameters
          in_file
            Opened file object to read and examine.

        Return value
            The mapping as returned by `chardet.detect`.

        """
    in_data = in_file.read()
    params = chardet.detect(in_data)
    return params


def report_file_encoding(in_file, encoding_params):
    """ Return a report of the file's encoding

        Parameters
          in_file
            File object being reported. Should have an appropriate
            `name` attribute.

          encoding_params
            Mapping as returned by `detect_encoding` on the file's
            data.

        Return value
            The report is a single line of text showing filename,
            detected encoding, and detection confidence.

        """
    file_name = in_file.name
    encoding_name = encoding_params['encoding']
    confidence = encoding_params['confidence']
    report = (
        "%(file_name)s: %(encoding_name)s"
        " (confidence: %(confidence)0.2f)") % vars()
    return report


def process_file(in_file):
    """ Process a single file

        Parameters
          in_file
            Opened file object to read and examine.

        Return value
            None.

        Reads the file contents, detects the encoding, and writes a
        report line to stdout.
        """
    encoding_params = detect_encoding(in_file)
    encoding_report = report_file_encoding(in_file, encoding_params)
    message = "%(encoding_report)s\n" % vars()
    sys.stdout.write(message)


class DetectEncodingApp(object):
    """ Application behaviour for 'detect-encoding' program """

    def __init__(self, argv):
        """ Set up a new instance """
        self._parse_commandline(argv)

    def _parse_commandline(self, argv):
        """ Parse command-line arguments """
        option_parser = OptionParser()
        (options, args) = option_parser.parse_args(argv[1:])
        self.file_names = args

    def _emit_file_error(self, file_name, error):
        """ Emit an error message regarding file processing """
        error_name = error.__class__.__name__
        message = (
            "%(file_name)s: %(error_name)s: %(error)s\n") % vars()
        sys.stderr.write(message)

    def _process_all_files(self, file_names):
        """ Process all files in list """
        if not len(file_names):
            file_names = [None]
        for file_name in file_names:
            try:
                if file_name is None:
                    file_name = sys.stdin.name
                    in_file = sys.stdin
                else:
                    in_file = open(file_name)
                process_file(in_file)
            except IOError, exc:
                self._emit_file_error(file_name, exc)

    def main(self):
        """ Main entry point for application """
        self._process_all_files(self.file_names)


def __main__(argv=None):
    """ Mainline code for this program """

    from sys import argv as sys_argv
    if argv is None:
        argv = sys_argv

    app = DetectEncodingApp(argv)
    exitcode = None
    try:
        app.main()
    except SystemExit, e:
        exitcode = e.code

    return exitcode

if __name__ == "__main__":
    exitcode = __main__(argv=sys.argv)
    sys.exit(exitcode)