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How to use add_testenv_attribute method in tox

Best Python code snippet using tox_python
config.py
Source:config.py
...46        """ add argument to command line parser.  This takes the47        same arguments that ``argparse.ArgumentParser.add_argument``.48        """49        return self.argparser.add_argument(*args, **kwargs)50    def add_testenv_attribute(self, name, type, help, default=None, postprocess=None):51        """ add an ini-file variable for "testenv" section.52        Types are specified as strings like "bool", "line-list", "string", "argv", "path",53        "argvlist".54        The ``postprocess`` function will be called for each testenv55        like ``postprocess(testenv_config=testenv_config, value=value)``56        where ``value`` is the value as read from the ini (or the default value)57        and ``testenv_config`` is a :py:class:`tox.config.TestenvConfig` instance58        which will receive all ini-variables as object attributes.59        Any postprocess function must return a value which will then be set60        as the final value in the testenv section.61        """62        self._testenv_attr.append(VenvAttribute(name, type, default, help, postprocess))63    def add_testenv_attribute_obj(self, obj):64        """ add an ini-file variable as an object.65        This works as the ``add_testenv_attribute`` function but expects66        "name", "type", "help", and "postprocess" attributes on the object.67        """68        assert hasattr(obj, "name")69        assert hasattr(obj, "type")70        assert hasattr(obj, "help")71        assert hasattr(obj, "postprocess")72        self._testenv_attr.append(obj)73    def _parse_args(self, args):74        return self.argparser.parse_args(args)75    def _format_help(self):76        return self.argparser.format_help()77class VenvAttribute:78    def __init__(self, name, type, default, help, postprocess):79        self.name = name80        self.type = type81        self.default = default82        self.help = help83        self.postprocess = postprocess84class DepOption:85    name = "deps"86    type = "line-list"87    help = "each line specifies a dependency in pip/setuptools format."88    default = ()89    def postprocess(self, testenv_config, value):90        deps = []91        config = testenv_config.config92        for depline in value:93            m = re.match(r":(\w+):\s*(\S+)", depline)94            if m:95                iname, name = m.groups()96                ixserver = config.indexserver[iname]97            else:98                name = depline.strip()99                ixserver = None100            name = self._replace_forced_dep(name, config)101            deps.append(DepConfig(name, ixserver))102        return deps103    def _replace_forced_dep(self, name, config):104        """105        Override the given dependency config name taking --force-dep-version106        option into account.107        :param name: dep config, for example ["pkg==1.0", "other==2.0"].108        :param config: Config instance109        :return: the new dependency that should be used for virtual environments110        """111        if not config.option.force_dep:112            return name113        for forced_dep in config.option.force_dep:114            if self._is_same_dep(forced_dep, name):115                return forced_dep116        return name117    @classmethod118    def _is_same_dep(cls, dep1, dep2):119        """120        Returns True if both dependency definitions refer to the121        same package, even if versions differ.122        """123        dep1_name = pkg_resources.Requirement.parse(dep1).project_name124        try:125            dep2_name = pkg_resources.Requirement.parse(dep2).project_name126        except pkg_resources.RequirementParseError:127            # we couldn't parse a version, probably a URL128            return False129        return dep1_name == dep2_name130class PosargsOption:131    name = "args_are_paths"132    type = "bool"133    default = True134    help = "treat positional args in commands as paths"135    def postprocess(self, testenv_config, value):136        config = testenv_config.config137        args = config.option.args138        if args:139            if value:140                args = []141                for arg in config.option.args:142                    if arg:143                        origpath = config.invocationcwd.join(arg, abs=True)144                        if origpath.check():145                            arg = testenv_config.changedir.bestrelpath(origpath)146                    args.append(arg)147            testenv_config._reader.addsubstitutions(args)148        return value149class InstallcmdOption:150    name = "install_command"151    type = "argv"152    default = "pip install {opts} {packages}"153    help = "install command for dependencies and package under test."154    def postprocess(self, testenv_config, value):155        if '{packages}' not in value:156            raise tox.exception.ConfigError(157                "'install_command' must contain '{packages}' substitution")158        return value159def parseconfig(args=None, plugins=()):160    """161    :param list[str] args: Optional list of arguments.162    :type pkg: str163    :rtype: :class:`Config`164    :raise SystemExit: toxinit file is not found165    """166    pm = get_plugin_manager(plugins)167    if args is None:168        args = sys.argv[1:]169    # prepare command line options170    parser = Parser()171    pm.hook.tox_addoption(parser=parser)172    # parse command line options173    option = parser._parse_args(args)174    interpreters = tox.interpreters.Interpreters(hook=pm.hook)175    config = Config(pluginmanager=pm, option=option, interpreters=interpreters)176    config._parser = parser177    config._testenv_attr = parser._testenv_attr178    # parse ini file179    basename = config.option.configfile180    if os.path.isfile(basename):181        inipath = py.path.local(basename)182    elif os.path.isdir(basename):183        # Assume 'tox.ini' filename if directory was passed184        inipath = py.path.local(os.path.join(basename, 'tox.ini'))185    else:186        for path in py.path.local().parts(reverse=True):187            inipath = path.join(basename)188            if inipath.check():189                break190        else:191            inipath = py.path.local().join('setup.cfg')192            if not inipath.check():193                helpoptions = option.help or option.helpini194                feedback("toxini file %r not found" % (basename),195                         sysexit=not helpoptions)196                if helpoptions:197                    return config198    try:199        parseini(config, inipath)200    except tox.exception.InterpreterNotFound:201        exn = sys.exc_info()[1]202        # Use stdout to match test expectations203        py.builtin.print_("ERROR: " + str(exn))204    # post process config object205    pm.hook.tox_configure(config=config)206    return config207def feedback(msg, sysexit=False):208    py.builtin.print_("ERROR: " + msg, file=sys.stderr)209    if sysexit:210        raise SystemExit(1)211class VersionAction(argparse.Action):212    def __call__(self, argparser, *args, **kwargs):213        version = tox.__version__214        py.builtin.print_("%s imported from %s" % (version, tox.__file__))215        raise SystemExit(0)216class SetenvDict:217    def __init__(self, dict, reader):218        self.reader = reader219        self.definitions = dict220        self.resolved = {}221        self._lookupstack = []222    def __contains__(self, name):223        return name in self.definitions224    def get(self, name, default=None):225        try:226            return self.resolved[name]227        except KeyError:228            try:229                if name in self._lookupstack:230                    raise KeyError(name)231                val = self.definitions[name]232            except KeyError:233                return os.environ.get(name, default)234            self._lookupstack.append(name)235            try:236                self.resolved[name] = res = self.reader._replace(val)237            finally:238                self._lookupstack.pop()239            return res240    def __getitem__(self, name):241        x = self.get(name, _dummy)242        if x is _dummy:243            raise KeyError(name)244        return x245    def keys(self):246        return self.definitions.keys()247    def __setitem__(self, name, value):248        self.definitions[name] = value249        self.resolved[name] = value250@hookimpl251def tox_addoption(parser):252    # formatter_class=argparse.ArgumentDefaultsHelpFormatter)253    parser.add_argument("--version", nargs=0, action=VersionAction,254                        dest="version",255                        help="report version information to stdout.")256    parser.add_argument("-h", "--help", action="store_true", dest="help",257                        help="show help about options")258    parser.add_argument("--help-ini", "--hi", action="store_true", dest="helpini",259                        help="show help about ini-names")260    parser.add_argument("-v", action='count', dest="verbosity", default=0,261                        help="increase verbosity of reporting output. -vv mode turns off "262                        "output redirection for package installation")263    parser.add_argument("--showconfig", action="store_true",264                        help="show configuration information for all environments. ")265    parser.add_argument("-l", "--listenvs", action="store_true",266                        dest="listenvs", help="show list of test environments "267                                              "(with description if verbose)")268    parser.add_argument("-a", "--listenvs-all", action="store_true",269                        dest="listenvs_all",270                        help="show list of all defined environments"271                             "(with description if verbose)")272    parser.add_argument("-c", action="store", default="tox.ini",273                        dest="configfile",274                        help="config file name or directory with 'tox.ini' file.")275    parser.add_argument("-e", action="append", dest="env",276                        metavar="envlist",277                        help="work against specified environments (ALL selects all).")278    parser.add_argument("--notest", action="store_true", dest="notest",279                        help="skip invoking test commands.")280    parser.add_argument("--sdistonly", action="store_true", dest="sdistonly",281                        help="only perform the sdist packaging activity.")282    parser.add_argument("--installpkg", action="store", default=None,283                        metavar="PATH",284                        help="use specified package for installation into venv, instead of "285                             "creating an sdist.")286    parser.add_argument("--develop", action="store_true", dest="develop",287                        help="install package in the venv using 'setup.py develop' via "288                             "'pip -e .'")289    parser.add_argument('-i', action="append",290                        dest="indexurl", metavar="URL",291                        help="set indexserver url (if URL is of form name=url set the "292                             "url for the 'name' indexserver, specifically)")293    parser.add_argument("--pre", action="store_true", dest="pre",294                        help="install pre-releases and development versions of dependencies. "295                             "This will pass the --pre option to install_command "296                             "(pip by default).")297    parser.add_argument("-r", "--recreate", action="store_true",298                        dest="recreate",299                        help="force recreation of virtual environments")300    parser.add_argument("--result-json", action="store",301                        dest="resultjson", metavar="PATH",302                        help="write a json file with detailed information "303                        "about all commands and results involved.")304    # We choose 1 to 4294967295 because it is the range of PYTHONHASHSEED.305    parser.add_argument("--hashseed", action="store",306                        metavar="SEED", default=None,307                        help="set PYTHONHASHSEED to SEED before running commands.  "308                             "Defaults to a random integer in the range [1, 4294967295] "309                             "([1, 1024] on Windows). "310                             "Passing 'noset' suppresses this behavior.")311    parser.add_argument("--force-dep", action="append",312                        metavar="REQ", default=None,313                        help="Forces a certain version of one of the dependencies "314                             "when configuring the virtual environment. REQ Examples "315                             "'pytest<2.7' or 'django>=1.6'.")316    parser.add_argument("--sitepackages", action="store_true",317                        help="override sitepackages setting to True in all envs")318    parser.add_argument("--alwayscopy", action="store_true",319                        help="override alwayscopy setting to True in all envs")320    parser.add_argument("--skip-missing-interpreters", action="store_true",321                        help="don't fail tests for missing interpreters")322    parser.add_argument("--workdir", action="store",323                        dest="workdir", metavar="PATH", default=None,324                        help="tox working directory")325    parser.add_argument("args", nargs="*",326                        help="additional arguments available to command positional substitution")327    parser.add_testenv_attribute(328        name="envdir", type="path", default="{toxworkdir}/{envname}",329        help="set venv directory -- be very careful when changing this as tox "330             "will remove this directory when recreating an environment")331    # add various core venv interpreter attributes332    def setenv(testenv_config, value):333        setenv = value334        config = testenv_config.config335        if "PYTHONHASHSEED" not in setenv and config.hashseed is not None:336            setenv['PYTHONHASHSEED'] = config.hashseed337        return setenv338    parser.add_testenv_attribute(339        name="setenv", type="dict_setenv", postprocess=setenv,340        help="list of X=Y lines with environment variable settings")341    def basepython_default(testenv_config, value):342        if value is None:343            for f in testenv_config.factors:344                if f in default_factors:345                    return default_factors[f]346            return sys.executable347        return str(value)348    parser.add_testenv_attribute(349        name="basepython", type="string", default=None, postprocess=basepython_default,350        help="executable name or path of interpreter used to create a "351             "virtual test environment.")352    def merge_description(testenv_config, value):353        """the reader by default joins generated description with new line,354         replace new line with space"""355        return value.replace('\n', ' ')356    parser.add_testenv_attribute(357        name="description", type="string", default='', postprocess=merge_description,358        help="short description of this environment")359    parser.add_testenv_attribute(360        name="envtmpdir", type="path", default="{envdir}/tmp",361        help="venv temporary directory")362    parser.add_testenv_attribute(363        name="envlogdir", type="path", default="{envdir}/log",364        help="venv log directory")365    parser.add_testenv_attribute(366        name="downloadcache", type="string", default=None,367        help="(ignored) has no effect anymore, pip-8 uses local caching by default")368    parser.add_testenv_attribute(369        name="changedir", type="path", default="{toxinidir}",370        help="directory to change to when running commands")371    parser.add_testenv_attribute_obj(PosargsOption())372    parser.add_testenv_attribute(373        name="skip_install", type="bool", default=False,374        help="Do not install the current package. This can be used when "375             "you need the virtualenv management but do not want to install "376             "the current package")377    parser.add_testenv_attribute(378        name="ignore_errors", type="bool", default=False,379        help="if set to True all commands will be executed irrespective of their "380             "result error status.")381    def recreate(testenv_config, value):382        if testenv_config.config.option.recreate:383            return True384        return value385    parser.add_testenv_attribute(386        name="recreate", type="bool", default=False, postprocess=recreate,387        help="always recreate this test environment.")388    def passenv(testenv_config, value):389        # Flatten the list to deal with space-separated values.390        value = list(391            itertools.chain.from_iterable(392                [x.split(' ') for x in value]))393        passenv = set([394            "PATH", "PIP_INDEX_URL", "LANG", "LANGUAGE", "LD_LIBRARY_PATH"395        ])396        # read in global passenv settings397        p = os.environ.get("TOX_TESTENV_PASSENV", None)398        if p is not None:399            env_values = [x for x in p.split() if x]400            value.extend(env_values)401        # we ensure that tmp directory settings are passed on402        # we could also set it to the per-venv "envtmpdir"403        # but this leads to very long paths when run with jenkins404        # so we just pass it on by default for now.405        if sys.platform == "win32":406            passenv.add("SYSTEMDRIVE")  # needed for pip6407            passenv.add("SYSTEMROOT")   # needed for python's crypto module408            passenv.add("PATHEXT")      # needed for discovering executables409            passenv.add("COMSPEC")      # needed for distutils cygwincompiler410            passenv.add("TEMP")411            passenv.add("TMP")412        else:413            passenv.add("TMPDIR")414        for spec in value:415            for name in os.environ:416                if fnmatchcase(name.upper(), spec.upper()):417                    passenv.add(name)418        return passenv419    parser.add_testenv_attribute(420        name="passenv", type="line-list", postprocess=passenv,421        help="environment variables needed during executing test commands "422             "(taken from invocation environment). Note that tox always "423             "passes through some basic environment variables which are "424             "needed for basic functioning of the Python system. "425             "See --showconfig for the eventual passenv setting.")426    parser.add_testenv_attribute(427        name="whitelist_externals", type="line-list",428        help="each lines specifies a path or basename for which tox will not warn "429             "about it coming from outside the test environment.")430    parser.add_testenv_attribute(431        name="platform", type="string", default=".*",432        help="regular expression which must match against ``sys.platform``. "433             "otherwise testenv will be skipped.")434    def sitepackages(testenv_config, value):435        return testenv_config.config.option.sitepackages or value436    def alwayscopy(testenv_config, value):437        return testenv_config.config.option.alwayscopy or value438    parser.add_testenv_attribute(439        name="sitepackages", type="bool", default=False, postprocess=sitepackages,440        help="Set to ``True`` if you want to create virtual environments that also "441             "have access to globally installed packages.")442    parser.add_testenv_attribute(443        name="alwayscopy", type="bool", default=False, postprocess=alwayscopy,444        help="Set to ``True`` if you want virtualenv to always copy files rather "445             "than symlinking.")446    def pip_pre(testenv_config, value):447        return testenv_config.config.option.pre or value448    parser.add_testenv_attribute(449        name="pip_pre", type="bool", default=False, postprocess=pip_pre,450        help="If ``True``, adds ``--pre`` to the ``opts`` passed to "451             "the install command. ")452    def develop(testenv_config, value):453        option = testenv_config.config.option454        return not option.installpkg and (value or option.develop)455    parser.add_testenv_attribute(456        name="usedevelop", type="bool", postprocess=develop, default=False,457        help="install package in develop/editable mode")458    parser.add_testenv_attribute_obj(InstallcmdOption())459    parser.add_testenv_attribute(460        name="list_dependencies_command",461        type="argv",462        default="pip freeze",463        help="list dependencies for a virtual environment")464    parser.add_testenv_attribute_obj(DepOption())465    parser.add_testenv_attribute(466        name="commands", type="argvlist", default="",467        help="each line specifies a test command and can use substitution.")468    parser.add_testenv_attribute(469        "ignore_outcome", type="bool", default=False,470        help="if set to True a failing result of this testenv will not make "471             "tox fail, only a warning will be produced")472    parser.add_testenv_attribute(473        "extras", type="line-list",474        help="list of extras to install with the source distribution or "475             "develop install")476class Config(object):477    """ Global Tox config object. """478    def __init__(self, pluginmanager, option, interpreters):479        #: dictionary containing envname to envconfig mappings480        self.envconfigs = {}481        self.invocationcwd = py.path.local()482        self.interpreters = interpreters483        self.pluginmanager = pluginmanager484        #: option namespace containing all parsed command line options485        self.option = option486    @property...
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