# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt

"""Convert pickle to JSON for coverage.py."""

from coverage.backward import pickle
from coverage.data import CoverageData


def pickle_read_raw_data(cls_unused, file_obj):
    """Replacement for CoverageData._read_raw_data."""
    return pickle.load(file_obj)


def pickle2json(infile, outfile):
    """Convert a coverage.py 3.x pickle data file to a 4.x JSON data file."""
    try:
        old_read_raw_data = CoverageData._read_raw_data
        CoverageData._read_raw_data = pickle_read_raw_data

        covdata = CoverageData()

        with open(infile, 'rb') as inf:
            covdata.read_fileobj(inf)

        covdata.write_file(outfile)
    finally:
        CoverageData._read_raw_data = old_read_raw_data


if __name__ == "__main__":
    from optparse import OptionParser

    parser = OptionParser(usage="usage: %s [options]" % __file__)
    parser.description = "Convert .coverage files from pickle to JSON format"
    parser.add_option(
        "-i", "--input-file", action="store", default=".coverage",
        help="Name of input file. Default .coverage",
    )
    parser.add_option(
        "-o", "--output-file", action="store", default=".coverage",
        help="Name of output file. Default .coverage",
    )

    (options, args) = parser.parse_args()

    pickle2json(options.input_file, options.output_file)