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Main program.

Args:
    fixer_pkg: the name of a package where the fixers are located.
    args: optional; a list of command line arguments. If omitted,
          sys.argv[1:] is used.

Returns a suggested exit status (0, 1, 2).

        def main(fixer_pkg='py3kwarn2to3.fixes', args=None):
    """Main program.

    Args:
        fixer_pkg: the name of a package where the fixers are located.
        args: optional; a list of command line arguments. If omitted,
              sys.argv[1:] is used.

    Returns a suggested exit status (0, 1, 2).

    """
    # Set up option parser
    parser = optparse.OptionParser(usage="2to3 [options] file|dir ...")
    parser.add_option("-d", "--doctests", action="store_true",
                      help="Fix up doctests only")
    parser.add_option("-f", "--fix", action="append", default=[],
                      help="Each FIX specifies a transformation; default: all")
    parser.add_option("-j", "--processes", action="store", default=1,
                      type="int", help="Run 2to3 concurrently")
    parser.add_option("-x", "--nofix", action="append", default=[],
                      help="Prevent a transformation from being run")
    parser.add_option("-l", "--list-fixes", action="store_true",
                      help="List available transformations")
    parser.add_option("-p", "--print-function", action="store_true",
                      help="Modify the grammar so that print() is a function")
    parser.add_option("-v", "--verbose", action="store_true",
                      help="More verbose logging")
    parser.add_option("--no-diffs", action="store_true",
                      help="Don't show diffs of the refactoring")
    parser.add_option("-w", "--write", action="store_true",
                      help="Write back modified files")
    parser.add_option("-n", "--nobackups", action="store_true", default=False,
                      help="Don't write backups for modified files")
    parser.add_option("-o", "--output-dir", action="store", type="str",
                      default="", help="Put output files in this directory "
                      "instead of overwriting the input files.  Requires -n.")
    parser.add_option("-W", "--write-unchanged-files", action="store_true",
                      help="Also write files even if no changes were required"
                      " (useful with --output-dir); implies -w.")
    parser.add_option("--add-suffix", action="store", type="str", default="",
                      help="Append this string to all output filenames."
                      " Requires -n if non-empty.  "
                      "ex: --add-suffix='3' will generate .py3 files.")

    # Parse command line arguments
    refactor_stdin = False
    flags = {}
    options, args = parser.parse_args(args)
    if options.write_unchanged_files:
        flags["write_unchanged_files"] = True
        if not options.write:
            warn("--write-unchanged-files/-W implies -w.")
        options.write = True
    # If we allowed these, the original files would be renamed to backup names
    # but not replaced.
    if options.output_dir and not options.nobackups:
        parser.error("Can't use --output-dir/-o without -n.")
    if options.add_suffix and not options.nobackups:
        parser.error("Can't use --add-suffix without -n.")

    if not options.write and options.no_diffs:
        warn("not writing files and not printing diffs; that's not very useful")
    if not options.write and options.nobackups:
        parser.error("Can't use -n without -w")
    if options.list_fixes:
        print("Available transformations for the -f/--fix option:")
        for fixname in refactor.get_all_fix_names(fixer_pkg):
            print(fixname)
        if not args:
            return 0
    if not args:
        print("At least one file or directory argument required.", file=sys.stderr)
        print("Use --help to show usage.", file=sys.stderr)
        return 2
    if "-" in args:
        refactor_stdin = True
        if options.write:
            print("Can't write to stdin.", file=sys.stderr)
            return 2
    if options.print_function:
        flags["print_function"] = True

    # Set up logging handler
    level = logging.DEBUG if options.verbose else logging.INFO
    logging.basicConfig(format='%(name)s: %(message)s', level=level)
    logger = logging.getLogger('py3kwarn2to3.main')

    # Initialize the refactoring tool
    avail_fixes = set(refactor.get_fixers_from_package(fixer_pkg))
    unwanted_fixes = set(fixer_pkg + ".fix_" + fix for fix in options.nofix)
    explicit = set()
    if options.fix:
        all_present = False
        for fix in options.fix:
            if fix == "all":
                all_present = True
            else:
                explicit.add(fixer_pkg + ".fix_" + fix)
        requested = avail_fixes.union(explicit) if all_present else explicit
    else:
        requested = avail_fixes.union(explicit)
    fixer_names = requested.difference(unwanted_fixes)
    input_base_dir = os.path.commonprefix(args)
    if (input_base_dir and not input_base_dir.endswith(os.sep)
        and not os.path.isdir(input_base_dir)):
        # One or more similar names were passed, their directory is the base.
        # os.path.commonprefix() is ignorant of path elements, this corrects
        # for that weird API.
        input_base_dir = os.path.dirname(input_base_dir)
    if options.output_dir:
        input_base_dir = input_base_dir.rstrip(os.sep)
        logger.info('Output in %r will mirror the input directory %r layout.',
                    options.output_dir, input_base_dir)
    rt = StdoutRefactoringTool(
            sorted(fixer_names), flags, sorted(explicit),
            options.nobackups, not options.no_diffs,
            input_base_dir=input_base_dir,
            output_dir=options.output_dir,
            append_suffix=options.add_suffix)

    # Refactor all files and directories passed as arguments
    if not rt.errors:
        if refactor_stdin:
            rt.refactor_stdin()
        else:
            try:
                rt.refactor(args, options.write, options.doctests,
                            options.processes)
            except refactor.MultiprocessingUnsupported:
                assert options.processes > 1
                print("Sorry, -j isn't "
                      "supported on this platform.", file=sys.stderr)
                return 1
        rt.summarize()

    # Return error status (0 if rt.errors is zero)
    return int(bool(rt.errors))
        


src/p/y/py3kwarn-HEAD/py3kwarn2to3/tests/test_main.py   py3kwarn(Download)
        sys.stderr = err_capture
        try:
            return main.main("py3kwarn2to3.fixes", args)
        finally:
            sys.stdin = save_stdin