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core.py8.7 KB · 235 lines
"""distutils.core The only module that needs to be imported to use the Distutils; providesthe 'setup' function (which is to be called from the setup script).  Alsoindirectly provides the Distribution and Command classes, although they arereally defined in distutils.dist and distutils.cmd.""" import osimport sys from distutils.debug import DEBUGfrom distutils.errors import * # Mainly import these so setup scripts can "from distutils.core import" them.from distutils.dist import Distributionfrom distutils.cmd import Commandfrom distutils.config import PyPIRCCommandfrom distutils.extension import Extension # This is a barebones help message generated displayed when the user# runs the setup script with no arguments at all.  More useful help# is generated with various --help options: global help, list commands,# and per-command help.USAGE = """\usage: %(script)s [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]   or: %(script)s --help [cmd1 cmd2 ...]   or: %(script)s --help-commands   or: %(script)s cmd --help""" def gen_usage (script_name):    script = os.path.basename(script_name)    return USAGE % vars()  # Some mild magic to control the behaviour of 'setup()' from 'run_setup()'._setup_stop_after = None_setup_distribution = None # Legal keyword arguments for the setup() functionsetup_keywords = ('distclass', 'script_name', 'script_args', 'options',                  'name', 'version', 'author', 'author_email',                  'maintainer', 'maintainer_email', 'url', 'license',                  'description', 'long_description', 'keywords',                  'platforms', 'classifiers', 'download_url',                  'requires', 'provides', 'obsoletes',                  ) # Legal keyword arguments for the Extension constructorextension_keywords = ('name', 'sources', 'include_dirs',                      'define_macros', 'undef_macros',                      'library_dirs', 'libraries', 'runtime_library_dirs',                      'extra_objects', 'extra_compile_args', 'extra_link_args',                      'swig_opts', 'export_symbols', 'depends', 'language') def setup (**attrs):    """The gateway to the Distutils: do everything your setup script needs    to do, in a highly flexible and user-driven way.  Briefly: create a    Distribution instance; find and parse config files; parse the command    line; run each Distutils command found there, customized by the options    supplied to 'setup()' (as keyword arguments), in config files, and on    the command line.     The Distribution instance might be an instance of a class supplied via    the 'distclass' keyword argument to 'setup'; if no such class is    supplied, then the Distribution class (in dist.py) is instantiated.    All other arguments to 'setup' (except for 'cmdclass') are used to set    attributes of the Distribution instance.     The 'cmdclass' argument, if supplied, is a dictionary mapping command    names to command classes.  Each command encountered on the command line    will be turned into a command class, which is in turn instantiated; any    class found in 'cmdclass' is used in place of the default, which is    (for command 'foo_bar') class 'foo_bar' in module    'distutils.command.foo_bar'.  The command class must provide a    'user_options' attribute which is a list of option specifiers for    'distutils.fancy_getopt'.  Any command-line options between the current    and the next command are used to set attributes of the current command    object.     When the entire command-line has been successfully parsed, calls the    'run()' method on each command object in turn.  This method will be    driven entirely by the Distribution object (which each command object    has a reference to, thanks to its constructor), and the    command-specific options that became attributes of each command    object.    """     global _setup_stop_after, _setup_distribution     # Determine the distribution class -- either caller-supplied or    # our Distribution (see below).    klass = attrs.get('distclass')    if klass:        del attrs['distclass']    else:        klass = Distribution     if 'script_name' not in attrs:        attrs['script_name'] = os.path.basename(sys.argv[0])    if 'script_args'  not in attrs:        attrs['script_args'] = sys.argv[1:]     # Create the Distribution instance, using the remaining arguments    # (ie. everything except distclass) to initialize it    try:        _setup_distribution = dist = klass(attrs)    except DistutilsSetupError as msg:        if 'name' not in attrs:            raise SystemExit("error in setup command: %s" % msg)        else:            raise SystemExit("error in %s setup command: %s" % \                  (attrs['name'], msg))     if _setup_stop_after == "init":        return dist     # Find and parse the config file(s): they will override options from    # the setup script, but be overridden by the command line.    dist.parse_config_files()     if DEBUG:        print("options (after parsing config files):")        dist.dump_option_dicts()     if _setup_stop_after == "config":        return dist     # Parse the command line and override config files; any    # command-line errors are the end user's fault, so turn them into    # SystemExit to suppress tracebacks.    try:        ok = dist.parse_command_line()    except DistutilsArgError as msg:        raise SystemExit(gen_usage(dist.script_name) + "\nerror: %s" % msg)     if DEBUG:        print("options (after parsing command line):")        dist.dump_option_dicts()     if _setup_stop_after == "commandline":        return dist     # And finally, run all the commands found on the command line.    if ok:        try:            dist.run_commands()        except KeyboardInterrupt:            raise SystemExit("interrupted")        except OSError as exc:            if DEBUG:                sys.stderr.write("error: %s\n" % (exc,))                raise            else:                raise SystemExit("error: %s" % (exc,))         except (DistutilsError,                CCompilerError) as msg:            if DEBUG:                raise            else:                raise SystemExit("error: " + str(msg))     return dist # setup ()  def run_setup (script_name, script_args=None, stop_after="run"):    """Run a setup script in a somewhat controlled environment, and    return the Distribution instance that drives things.  This is useful    if you need to find out the distribution meta-data (passed as    keyword args from 'script' to 'setup()', or the contents of the    config files or command-line.     'script_name' is a file that will be read and run with 'exec()';    'sys.argv[0]' will be replaced with 'script' for the duration of the    call.  'script_args' is a list of strings; if supplied,    'sys.argv[1:]' will be replaced by 'script_args' for the duration of    the call.     'stop_after' tells 'setup()' when to stop processing; possible    values:      init        stop after the Distribution instance has been created and        populated with the keyword arguments to 'setup()'      config        stop after config files have been parsed (and their data        stored in the Distribution instance)      commandline        stop after the command-line ('sys.argv[1:]' or 'script_args')        have been parsed (and the data stored in the Distribution)      run [default]        stop after all commands have been run (the same as if 'setup()'        had been called in the usual way     Returns the Distribution instance, which provides all information    used to drive the Distutils.    """    if stop_after not in ('init', 'config', 'commandline', 'run'):        raise ValueError("invalid value for 'stop_after': %r" % (stop_after,))     global _setup_stop_after, _setup_distribution    _setup_stop_after = stop_after     save_argv = sys.argv.copy()    g = {'__file__': script_name}    try:        try:            sys.argv[0] = script_name            if script_args is not None:                sys.argv[1:] = script_args            with open(script_name, 'rb') as f:                exec(f.read(), g)        finally:            sys.argv = save_argv            _setup_stop_after = None    except SystemExit:        # Hmm, should we do something if exiting with a non-zero code        # (ie. error)?        pass     if _setup_distribution is None:        raise RuntimeError(("'distutils.core.setup()' was never called -- "               "perhaps '%s' is not a Distutils setup script?") % \              script_name)     # I wonder if the setup script's namespace -- g and l -- would be of    # any interest to callers?    #print "_setup_distribution:", _setup_distribution    return _setup_distribution # run_setup ()