Bear.get_dependencies() - Code Metrics - Inspection of "Bear: get_dependencies() -> BEAR_DEPS" - coala-analyzer/coala - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#2592)

by Udayan

created 2016-08-08 09:29 UTC

Bear.get_dependencies() A

↳ Parent: Bear

Complexity

Conditions

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
dl	0
loc	12
rs	9.4285
c	0
b	0
f	0

import traceback
from functools import partial
from os import makedirs
from os.path import join, abspath, exists
from shutil import copyfileobj
from urllib.request import urlopen

from appdirs import user_data_dir

from pyprint.Printer import Printer

from coala_utils.decorators import (enforce_signature, classproperty,
                                    get_public_members)

from coalib.bears.requirements.PackageRequirement import PackageRequirement

from coalib.bears.requirements.PipRequirement import PipRequirement

from coalib.output.printers.LogPrinter import LogPrinter
from coalib.results.Result import Result
from coalib.settings.FunctionMetadata import FunctionMetadata
from coalib.settings.Section import Section
from coalib.settings.ConfigurationGathering import get_config_directory


class Bear(Printer, LogPrinter):
    """
    A bear contains the actual subroutine that is responsible for checking
    source code for certain specifications. However it can actually do
    whatever it wants with the files it gets. If you are missing some Result
    type, feel free to contact us and/or help us extending the coalib.

    This is the base class for every bear. If you want to write an bear, you
    will probably want to look at the GlobalBear and LocalBear classes that
    inherit from this class. In any case you'll want to overwrite at least the
    run method. You can send debug/warning/error messages through the
    debug(), warn(), err() functions. These will send the
    appropriate messages so that they are outputted. Be aware that if you use
    err(), you are expected to also terminate the bear run-through
    immediately.

    If you need some setup or teardown for your bear, feel free to overwrite
    the set_up() and tear_down() functions. They will be invoked
    before/after every run invocation.

    Settings are available at all times through self.section.

    To indicate which languages your bear supports, just give it the
    ``LANGUAGES`` value which should be a set of string(s):

    >>> class SomeBear(Bear):
    ...     LANGUAGES = {'C', 'CPP','C#', 'D'}

    To indicate the requirements of the bear, assign ``REQUIREMENTS`` a set
    with instances of ``PackageRequirements``.

    >>> class SomeBear(Bear):
    ...     REQUIREMENTS = {
    ...         PackageRequirement('pip', 'coala_decorators', '0.2.1')}

    If your bear uses requirements from a manager we have a subclass from,
    you can use the subclass, such as ``PipRequirement``, without specifying
    manager:

    >>> class SomeBear(Bear):
    ...     REQUIREMENTS = {PipRequirement('coala_decorators', '0.2.1')}

    To specify multiple requirements using ``pip``, you can use the multiple
    method. This can receive both tuples of strings, in case you want a specific
    version, or a simple string, in case you want the latest version to be
    specified.

    >>> class SomeBear(Bear):
    ...     REQUIREMENTS = PipRequirement.multiple(
    ...         ('colorama', '0.1'), 'coala_decorators')

    To specify additional attributes to your bear, use the following:

    >>> class SomeBear(Bear):
    ...     AUTHORS = {'Jon Snow'}
    ...     AUTHORS_EMAILS = {'[email protected]'}
    ...     MAINTAINERS = {'Catelyn Stark'}
    ...     MAINTAINERS_EMAILS = {'[email protected]'}
    ...     LICENSE = 'AGPL-3.0'
    ...     ASCIINEMA_URL = 'https://asciinema.org/a/80761'

    If the maintainers are the same as the authors, they can be omitted:

    >>> class SomeBear(Bear):
    ...     AUTHORS = {'Jon Snow'}
    ...     AUTHORS_EMAILS = {'[email protected]'}
    >>> SomeBear.maintainers
    {'Jon Snow'}
    >>> SomeBear.maintainers_emails
    {'[email protected]'}

    If your bear needs to include local files, then specify it giving strings
    containing relative file paths to the INCLUDE_LOCAL_FILES set:

    >>> class SomeBear(Bear):
    ...     INCLUDE_LOCAL_FILES = {'checkstyle.jar', 'google_checks.xml'}

    To keep track easier of what a bear can do, simply tell it to the CAN_FIX
    and the CAN_DETECT sets. Possible values:

    >>> CAN_DETECT = {'Syntax', 'Formatting', 'Security', 'Complexity', 'Smell',
    ... 'Unused Code', 'Redundancy', 'Variable Misuse', 'Spelling',
    ... 'Memory Leak', 'Documentation', 'Duplication', 'Commented Code',
    ... 'Grammar', 'Missing Import', 'Unreachable Code', 'Undefined Element',
    ... 'Code Simplification'}
    >>> CAN_FIX = {'Syntax', ...}

    Specifying something to CAN_FIX makes it obvious that it can be detected
    too, so it may be omitted:

    >>> class SomeBear(Bear):
    ...     CAN_DETECT = {'Syntax', 'Security'}
    ...     CAN_FIX = {'Redundancy'}
    >>> list(sorted(SomeBear.can_detect))
    ['Redundancy', 'Security', 'Syntax']

    Every bear has a data directory which is unique to that particular bear:

    >>> class SomeBear(Bear): pass
    >>> class SomeOtherBear(Bear): pass
    >>> SomeBear.data_dir == SomeOtherBear.data_dir
    False

    BEAR_DEPS contains bear classes that are to be executed before this bear
    gets executed. The results of these bears will then be passed to the
    run method as a dict via the dependency_results argument. The dict
    will have the name of the Bear as key and the list of its results as
    results:

    >>> class SomeBear(Bear):
    ...      BEAR_DEPS = ["AnotherBear"]
    >>> SomeBear.BEAR_DEPS
    ['AnotherBear']
    """

    LANGUAGES = set()
    REQUIREMENTS = set()
    AUTHORS = set()
    AUTHORS_EMAILS = set()
    MAINTAINERS = set()
    MAINTAINERS_EMAILS = set()
    PLATFORMS = {'any'}
    LICENSE = ''
    INCLUDE_LOCAL_FILES = set()
    CAN_DETECT = set()
    CAN_FIX = set()
    ASCIINEMA_URL = ''
    BEAR_DEPS = []

    @classproperty
    def name(cls):
        """
        :return: The name of the bear
        """
        return cls.__name__

    @classproperty
    def can_detect(cls):
        """
        :return: A set that contains everything a bear can detect, gathering
                 information from what it can fix too.
        """
        return cls.CAN_DETECT | cls.CAN_FIX

    @classproperty
    def maintainers(cls):
        """
        :return: A set containing ``MAINTAINERS`` if specified, else takes
                 ``AUTHORS`` by default.
        """
        return cls.AUTHORS if cls.MAINTAINERS == set() else cls.MAINTAINERS

    @classproperty
    def maintainers_emails(cls):
        """
        :return: A set containing ``MAINTAINERS_EMAILS`` if specified, else
                 takes ``AUTHORS_EMAILS`` by default.
        """
        return (cls.AUTHORS_EMAILS if cls.MAINTAINERS_EMAILS == set()
                else cls.MAINTAINERS)

    @enforce_signature
    def __init__(self,
                 section: Section,
                 message_queue,
                 timeout=0):
        """
        Constructs a new bear.

        :param section:       The section object where bear settings are
                              contained.
        :param message_queue: The queue object for messages. Can be ``None``.
        :param timeout:       The time the bear is allowed to run. To set no
                              time limit, use 0.
        :raises TypeError:    Raised when ``message_queue`` is no queue.
        :raises RuntimeError: Raised when bear requirements are not fulfilled.
        """
        Printer.__init__(self)
        LogPrinter.__init__(self, self)

        if message_queue is not None and not hasattr(message_queue, "put"):
            raise TypeError("message_queue has to be a Queue or None.")

        self.section = section
        self.message_queue = message_queue
        self.timeout = timeout

        self.setup_dependencies()
        cp = type(self).check_prerequisites()
        if cp is not True:
            error_string = ("The bear " + self.name +
                            " does not fulfill all requirements.")
            if cp is not False:
                error_string += " " + cp

            self.warn(error_string)
            raise RuntimeError(error_string)

    def _print(self, output, **kwargs):
        self.debug(output)

    def log_message(self, log_message, timestamp=None, **kwargs):
        if self.message_queue is not None:
            self.message_queue.put(log_message)

    def run(self, *args, dependency_results=None, **kwargs):
        raise NotImplementedError

    def run_bear_from_section(self, args, kwargs):
        try:
            kwargs.update(
                self.get_metadata().create_params_from_section(self.section))
        except ValueError as err:
            self.warn("The bear {} cannot be executed.".format(
                self.name), str(err))
            return

        return self.run(*args, **kwargs)

    def execute(self, *args, **kwargs):
        name = self.name
        try:
            self.debug("Running bear {}...".format(name))
            # If it's already a list it won't change it
            result = self.run_bear_from_section(args, kwargs)
            return [] if result is None else list(result)
        except:
            self.warn(
                "Bear {} failed to run. Take a look at debug messages (`-L "
                "DEBUG`) for further information.".format(name))
            self.debug(
                "The bear {bear} raised an exception. If you are the writer "
                "of this bear, please make sure to catch all exceptions. If "
                "not and this error annoys you, you might want to get in "
                "contact with the writer of this bear.\n\nTraceback "
                "information is provided below:\n\n{traceback}"
                "\n".format(bear=name, traceback=traceback.format_exc()))

    @staticmethod
    def kind():
        """
        :return: The kind of the bear
        """
        raise NotImplementedError

    @classmethod
    def get_metadata(cls):
        """
        :return: Metadata for the run function. However parameters like
                 ``self`` or parameters implicitly used by coala (e.g.
                 filename for local bears) are already removed.
        """
        return FunctionMetadata.from_function(
            cls.run,
            omit={"self", "dependency_results"})

    @classmethod
    def __json__(cls):
        """
        Override JSON export of ``Bear`` object.
        """
        _dict = get_public_members(cls)
        metadata = cls.get_metadata()
        non_optional_params = metadata.non_optional_params
        optional_params = metadata.optional_params
        _dict["metadata"] = {
            "desc": metadata.desc,
            "non_optional_params": ({param: non_optional_params[param][0]}
                                    for param in non_optional_params),
            "optional_params": ({param: optional_params[param][0]}
                                for param in optional_params)}

        # Delete attributes that cannot be serialized
        unserializable_attributes = ["new_result", "printer"]
        for attribute in unserializable_attributes:
            _dict.pop(attribute, None)
        return _dict

    @classmethod
    def missing_dependencies(cls, lst):
        """
        Checks if the given list contains all dependencies.

        :param lst: A list of all already resolved bear classes (not
                    instances).
        :return:    A list of missing dependencies.
        """
        dep_classes = cls.BEAR_DEPS

        for item in lst:
            if item in dep_classes:
                dep_classes.remove(item)

        return dep_classes

    @classmethod
    def get_non_optional_settings(cls):
        """
        This method has to determine which settings are needed by this bear.
        The user will be prompted for needed settings that are not available
        in the settings file so don't include settings where a default value
        would do.

        :return: A dictionary of needed settings as keys and a tuple of help
                 text and annotation as values
        """
        return cls.get_metadata().non_optional_params

    @staticmethod
    def setup_dependencies():
        """
        This is a user defined function that can download and set up
        dependencies (via download_cached_file or arbitary other means) in an OS
        independent way.
        """

    @classmethod
    def check_prerequisites(cls):
        """
        Checks whether needed runtime prerequisites of the bear are satisfied.

        This function gets executed at construction and returns True by
        default.

        Section value requirements shall be checked inside the ``run`` method.

        :return: True if prerequisites are satisfied, else False or a string
                 that serves a more detailed description of what's missing.
        """
        return True

    def get_config_dir(self):
        """
        Gives the directory where the configuration file is

        :return: Directory of the config file
        """
        return get_config_directory(self.section)

    def download_cached_file(self, url, filename):
        """
        Downloads the file if needed and caches it for the next time. If a
        download happens, the user will be informed.

        Take a sane simple bear:

        >>> from queue import Queue
        >>> bear = Bear(Section("a section"), Queue())

        We can now carelessly query for a neat file that doesn't exist yet:

        >>> from os import remove
        >>> if exists(join(bear.data_dir, "a_file")):
        ...     remove(join(bear.data_dir, "a_file"))
        >>> file = bear.download_cached_file("http://gitmate.com/", "a_file")

        If we download it again, it'll be much faster as no download occurs:

        >>> newfile = bear.download_cached_file("http://gitmate.com/", "a_file")
        >>> newfile == file
        True

        :param url:      The URL to download the file from.
        :param filename: The filename it should get, e.g. "test.txt".
        :return:         A full path to the file ready for you to use!
        """
        filename = join(self.data_dir, filename)
        if exists(filename):
            return filename

        self.info("Downloading {filename!r} for bear {bearname} from {url}."
                  .format(filename=filename, bearname=self.name, url=url))

        with urlopen(url) as response, open(filename, 'wb') as out_file:
            copyfileobj(response, out_file)
        return filename

    @classproperty
    def data_dir(cls):
        """
        Returns a directory that may be used by the bear to store stuff. Every
        bear has an own directory dependent on their name.
        """
        data_dir = abspath(join(user_data_dir('coala-bears'), cls.name))

        makedirs(data_dir, exist_ok=True)
        return data_dir

    @property
    def new_result(self):
        """
        Returns a partial for creating a result with this bear already bound.
        """
        return partial(Result.from_values, self)


1			import traceback
2			from functools import partial
3			from os import makedirs
4			from os.path import join, abspath, exists
5			from shutil import copyfileobj
6			from urllib.request import urlopen
7
8			from appdirs import user_data_dir
9
10			from pyprint.Printer import Printer
11
12			from coala_utils.decorators import (enforce_signature, classproperty,
13			get_public_members)
14
15			from coalib.bears.requirements.PackageRequirement import PackageRequirement
			0 ignored issues – show Unused Code introduced 2016-05-23 19:58 UTC by Report Bug Copy Issue Report Unused PackageRequirement imported from coalib.bears.requirements.PackageRequirement Loading history...
16			from coalib.bears.requirements.PipRequirement import PipRequirement
			0 ignored issues – show Unused Code introduced 2016-06-19 17:12 UTC by Report Bug Copy Issue Report Unused PipRequirement imported from coalib.bears.requirements.PipRequirement Loading history...
17			from coalib.output.printers.LogPrinter import LogPrinter
18			from coalib.results.Result import Result
19			from coalib.settings.FunctionMetadata import FunctionMetadata
20			from coalib.settings.Section import Section
21			from coalib.settings.ConfigurationGathering import get_config_directory
22
23
24			class Bear(Printer, LogPrinter):
25			"""
26			A bear contains the actual subroutine that is responsible for checking
27			source code for certain specifications. However it can actually do
28			whatever it wants with the files it gets. If you are missing some Result
29			type, feel free to contact us and/or help us extending the coalib.
30
31			This is the base class for every bear. If you want to write an bear, you
32			will probably want to look at the GlobalBear and LocalBear classes that
33			inherit from this class. In any case you'll want to overwrite at least the
34			run method. You can send debug/warning/error messages through the
35			debug(), warn(), err() functions. These will send the
36			appropriate messages so that they are outputted. Be aware that if you use
37			err(), you are expected to also terminate the bear run-through
38			immediately.
39
40			If you need some setup or teardown for your bear, feel free to overwrite
41			the set_up() and tear_down() functions. They will be invoked
42			before/after every run invocation.
43
44			Settings are available at all times through self.section.
45
46			To indicate which languages your bear supports, just give it the
47			``LANGUAGES`` value which should be a set of string(s):
48
49			>>> class SomeBear(Bear):
50			... LANGUAGES = {'C', 'CPP','C#', 'D'}
51
52			To indicate the requirements of the bear, assign ``REQUIREMENTS`` a set
53			with instances of ``PackageRequirements``.
54
55			>>> class SomeBear(Bear):
56			... REQUIREMENTS = {
57			... PackageRequirement('pip', 'coala_decorators', '0.2.1')}
58
59			If your bear uses requirements from a manager we have a subclass from,
60			you can use the subclass, such as ``PipRequirement``, without specifying
61			manager:
62
63			>>> class SomeBear(Bear):
64			... REQUIREMENTS = {PipRequirement('coala_decorators', '0.2.1')}
65
66			To specify multiple requirements using ``pip``, you can use the multiple
67			method. This can receive both tuples of strings, in case you want a specific
68			version, or a simple string, in case you want the latest version to be
69			specified.
70
71			>>> class SomeBear(Bear):
72			... REQUIREMENTS = PipRequirement.multiple(
73			... ('colorama', '0.1'), 'coala_decorators')
74
75			To specify additional attributes to your bear, use the following:
76
77			>>> class SomeBear(Bear):
78			... AUTHORS = {'Jon Snow'}
79			... AUTHORS_EMAILS = {'[email protected]'}
80			... MAINTAINERS = {'Catelyn Stark'}
81			... MAINTAINERS_EMAILS = {'[email protected]'}
82			... LICENSE = 'AGPL-3.0'
83			... ASCIINEMA_URL = 'https://asciinema.org/a/80761'
84
85			If the maintainers are the same as the authors, they can be omitted:
86
87			>>> class SomeBear(Bear):
88			... AUTHORS = {'Jon Snow'}
89			... AUTHORS_EMAILS = {'[email protected]'}
90			>>> SomeBear.maintainers
91			{'Jon Snow'}
92			>>> SomeBear.maintainers_emails
93			{'[email protected]'}
94
95			If your bear needs to include local files, then specify it giving strings
96			containing relative file paths to the INCLUDE_LOCAL_FILES set:
97
98			>>> class SomeBear(Bear):
99			... INCLUDE_LOCAL_FILES = {'checkstyle.jar', 'google_checks.xml'}
100
101			To keep track easier of what a bear can do, simply tell it to the CAN_FIX
102			and the CAN_DETECT sets. Possible values:
103
104			>>> CAN_DETECT = {'Syntax', 'Formatting', 'Security', 'Complexity', 'Smell',
105			... 'Unused Code', 'Redundancy', 'Variable Misuse', 'Spelling',
106			... 'Memory Leak', 'Documentation', 'Duplication', 'Commented Code',
107			... 'Grammar', 'Missing Import', 'Unreachable Code', 'Undefined Element',
108			... 'Code Simplification'}
109			>>> CAN_FIX = {'Syntax', ...}
110
111			Specifying something to CAN_FIX makes it obvious that it can be detected
112			too, so it may be omitted:
113
114			>>> class SomeBear(Bear):
115			... CAN_DETECT = {'Syntax', 'Security'}
116			... CAN_FIX = {'Redundancy'}
117			>>> list(sorted(SomeBear.can_detect))
118			['Redundancy', 'Security', 'Syntax']
119
120			Every bear has a data directory which is unique to that particular bear:
121
122			>>> class SomeBear(Bear): pass
123			>>> class SomeOtherBear(Bear): pass
124			>>> SomeBear.data_dir == SomeOtherBear.data_dir
125			False
126
127			BEAR_DEPS contains bear classes that are to be executed before this bear
128			gets executed. The results of these bears will then be passed to the
129			run method as a dict via the dependency_results argument. The dict
130			will have the name of the Bear as key and the list of its results as
131			results:
132
133			>>> class SomeBear(Bear):
134			... BEAR_DEPS = ["AnotherBear"]
135			>>> SomeBear.BEAR_DEPS
136			['AnotherBear']
137			"""
138
139			LANGUAGES = set()
140			REQUIREMENTS = set()
141			AUTHORS = set()
142			AUTHORS_EMAILS = set()
143			MAINTAINERS = set()
144			MAINTAINERS_EMAILS = set()
145			PLATFORMS = {'any'}
146			LICENSE = ''
147			INCLUDE_LOCAL_FILES = set()
148			CAN_DETECT = set()
149			CAN_FIX = set()
150			ASCIINEMA_URL = ''
151			BEAR_DEPS = []
152
153			@classproperty
154			def name(cls):
155			"""
156			:return: The name of the bear
157			"""
158			return cls.__name__
159
160			@classproperty
161			def can_detect(cls):
162			"""
163			:return: A set that contains everything a bear can detect, gathering
164			information from what it can fix too.
165			"""
166			return cls.CAN_DETECT \| cls.CAN_FIX
167
168			@classproperty
169			def maintainers(cls):
170			"""
171			:return: A set containing ``MAINTAINERS`` if specified, else takes
172			``AUTHORS`` by default.
173			"""
174			return cls.AUTHORS if cls.MAINTAINERS == set() else cls.MAINTAINERS
175
176			@classproperty
177			def maintainers_emails(cls):
178			"""
179			:return: A set containing ``MAINTAINERS_EMAILS`` if specified, else
180			takes ``AUTHORS_EMAILS`` by default.
181			"""
182			return (cls.AUTHORS_EMAILS if cls.MAINTAINERS_EMAILS == set()
183			else cls.MAINTAINERS)
184
185			@enforce_signature
186			def __init__(self,
187			section: Section,
188			message_queue,
189			timeout=0):
190			"""
191			Constructs a new bear.
192
193			:param section: The section object where bear settings are
194			contained.
195			:param message_queue: The queue object for messages. Can be ``None``.
196			:param timeout: The time the bear is allowed to run. To set no
197			time limit, use 0.
198			:raises TypeError: Raised when ``message_queue`` is no queue.
199			:raises RuntimeError: Raised when bear requirements are not fulfilled.
200			"""
201			Printer.__init__(self)
202			LogPrinter.__init__(self, self)
203
204			if message_queue is not None and not hasattr(message_queue, "put"):
205			raise TypeError("message_queue has to be a Queue or None.")
206
207			self.section = section
208			self.message_queue = message_queue
209			self.timeout = timeout
210
211			self.setup_dependencies()
212			cp = type(self).check_prerequisites()
213			if cp is not True:
214			error_string = ("The bear " + self.name +
215			" does not fulfill all requirements.")
216			if cp is not False:
217			error_string += " " + cp
218
219			self.warn(error_string)
220			raise RuntimeError(error_string)
221
222			def _print(self, output, **kwargs):
223			self.debug(output)
224
225			def log_message(self, log_message, timestamp=None, **kwargs):
226			if self.message_queue is not None:
227			self.message_queue.put(log_message)
228
229			def run(self, args, dependency_results=None, *kwargs):
230			raise NotImplementedError
231
232			def run_bear_from_section(self, args, kwargs):
233			try:
234			kwargs.update(
235			self.get_metadata().create_params_from_section(self.section))
236			except ValueError as err:
237			self.warn("The bear {} cannot be executed.".format(
238			self.name), str(err))
239			return
240
241			return self.run(args, *kwargs)
242
243			def execute(self, args, *kwargs):
244			name = self.name
245			try:
246			self.debug("Running bear {}...".format(name))
247			# If it's already a list it won't change it
248			result = self.run_bear_from_section(args, kwargs)
249			return [] if result is None else list(result)
250			except:
251			self.warn(
252			"Bear {} failed to run. Take a look at debug messages (`-L "
253			"DEBUG`) for further information.".format(name))
254			self.debug(
255			"The bear {bear} raised an exception. If you are the writer "
256			"of this bear, please make sure to catch all exceptions. If "
257			"not and this error annoys you, you might want to get in "
258			"contact with the writer of this bear.\n\nTraceback "
259			"information is provided below:\n\n{traceback}"
260			"\n".format(bear=name, traceback=traceback.format_exc()))
261
262			@staticmethod
263			def kind():
264			"""
265			:return: The kind of the bear
266			"""
267			raise NotImplementedError
268
269			@classmethod
270			def get_metadata(cls):
271			"""
272			:return: Metadata for the run function. However parameters like
273			``self`` or parameters implicitly used by coala (e.g.
274			filename for local bears) are already removed.
275			"""
276			return FunctionMetadata.from_function(
277			cls.run,
278			omit={"self", "dependency_results"})
279
280			@classmethod
281			def __json__(cls):
282			"""
283			Override JSON export of ``Bear`` object.
284			"""
285			_dict = get_public_members(cls)
286			metadata = cls.get_metadata()
287			non_optional_params = metadata.non_optional_params
288			optional_params = metadata.optional_params
289			_dict["metadata"] = {
290			"desc": metadata.desc,
291			"non_optional_params": ({param: non_optional_params[param][0]}
292			for param in non_optional_params),
293			"optional_params": ({param: optional_params[param][0]}
294			for param in optional_params)}
295
296			# Delete attributes that cannot be serialized
297			unserializable_attributes = ["new_result", "printer"]
298			for attribute in unserializable_attributes:
299			_dict.pop(attribute, None)
300			return _dict
301
302			@classmethod
303			def missing_dependencies(cls, lst):
304			"""
305			Checks if the given list contains all dependencies.
306
307			:param lst: A list of all already resolved bear classes (not
308			instances).
309			:return: A list of missing dependencies.
310			"""
311			dep_classes = cls.BEAR_DEPS
312
313			for item in lst:
314			if item in dep_classes:
315			dep_classes.remove(item)
316
317			return dep_classes
318
319			@classmethod
320			def get_non_optional_settings(cls):
321			"""
322			This method has to determine which settings are needed by this bear.
323			The user will be prompted for needed settings that are not available
324			in the settings file so don't include settings where a default value
325			would do.
326
327			:return: A dictionary of needed settings as keys and a tuple of help
328			text and annotation as values
329			"""
330			return cls.get_metadata().non_optional_params
331
332			@staticmethod
333			def setup_dependencies():
334			"""
335			This is a user defined function that can download and set up
336			dependencies (via download_cached_file or arbitary other means) in an OS
337			independent way.
338			"""
339
340			@classmethod
341			def check_prerequisites(cls):
342			"""
343			Checks whether needed runtime prerequisites of the bear are satisfied.
344
345			This function gets executed at construction and returns True by
346			default.
347
348			Section value requirements shall be checked inside the ``run`` method.
349
350			:return: True if prerequisites are satisfied, else False or a string
351			that serves a more detailed description of what's missing.
352			"""
353			return True
354
355			def get_config_dir(self):
356			"""
357			Gives the directory where the configuration file is
358
359			:return: Directory of the config file
360			"""
361			return get_config_directory(self.section)
362
363			def download_cached_file(self, url, filename):
364			"""
365			Downloads the file if needed and caches it for the next time. If a
366			download happens, the user will be informed.
367
368			Take a sane simple bear:
369
370			>>> from queue import Queue
371			>>> bear = Bear(Section("a section"), Queue())
372
373			We can now carelessly query for a neat file that doesn't exist yet:
374
375			>>> from os import remove
376			>>> if exists(join(bear.data_dir, "a_file")):
377			... remove(join(bear.data_dir, "a_file"))
378			>>> file = bear.download_cached_file("http://gitmate.com/", "a_file")
379
380			If we download it again, it'll be much faster as no download occurs:
381
382			>>> newfile = bear.download_cached_file("http://gitmate.com/", "a_file")
383			>>> newfile == file
384			True
385
386			:param url: The URL to download the file from.
387			:param filename: The filename it should get, e.g. "test.txt".
388			:return: A full path to the file ready for you to use!
389			"""
390			filename = join(self.data_dir, filename)
391			if exists(filename):
392			return filename
393
394			self.info("Downloading {filename!r} for bear {bearname} from {url}."
395			.format(filename=filename, bearname=self.name, url=url))
396
397			with urlopen(url) as response, open(filename, 'wb') as out_file:
398			copyfileobj(response, out_file)
399			return filename
400
401			@classproperty
402			def data_dir(cls):
403			"""
404			Returns a directory that may be used by the bear to store stuff. Every
405			bear has an own directory dependent on their name.
406			"""
407			data_dir = abspath(join(user_data_dir('coala-bears'), cls.name))
408
409			makedirs(data_dir, exist_ok=True)
410			return data_dir
411
412			@property
413			def new_result(self):
414			"""
415			Returns a partial for creating a result with this bear already bound.
416			"""
417			return partial(Result.from_values, self)
418

coala-analyzer / coala

Pull Request — master (#2592)

Bear.get_dependencies() A

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