pylint: upgrade to 1.4.0

third_party/pylint/lint.py

 # Copyright (c) 2003-2014 LOGILAB S.A. (Paris, FRANCE).
 # http://www.logilab.fr/ -- mailto:contact@logilab.fr
 #
 # This program is free software; you can redistribute it and/or modify it under
 # the terms of the GNU General Public License as published by the Free Software
 # Foundation; either version 2 of the License, or (at your option) any later
 # version.
 #
 # This program is distributed in the hope that it will be useful, but WITHOUT
 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 # FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details
 #
 # You should have received a copy of the GNU General Public License along with
 # this program; if not, write to the Free Software Foundation, Inc.,
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 """ %prog [options] module_or_package
 
   Check that a module satisfies a coding standard (and more !).
 
     %prog --help
 
   Display this help message and exit.
 
     %prog --help-msg <msg-id>[,<msg-id>]
 
   Display help messages about given message identifiers and exit.
 """
+from __future__ import print_function
 
 # import this first to avoid builtin namespace pollution
 from pylint.checkers import utils #pylint: disable=unused-import
 
 import sys
 import os
 import tokenize
+from collections import defaultdict
+from contextlib import contextmanager
 from operator import attrgetter
 from warnings import warn
+from itertools import chain
+try:
+    import multiprocessing
+except ImportError:
+    multiprocessing = None
 
-from logilab.common.configuration import UnsupportedAction, OptionsManagerMixIn
+import six
+from logilab.common.configuration import (
+    UnsupportedAction, OptionsManagerMixIn)
 from logilab.common.optik_ext import check_csv
 from logilab.common.interface import implements
 from logilab.common.textutils import splitstrip, unquote
 from logilab.common.ureports import Table, Text, Section
 from logilab.common.__pkginfo__ import version as common_version
-
 from astroid import MANAGER, AstroidBuildingException
 from astroid.__pkginfo__ import version as astroid_version
 from astroid.modutils import load_module_from_name, get_module_part
 
 from pylint.utils import (
     MSG_TYPES, OPTION_RGX,
     PyLintASTWalker, UnknownMessage, MessagesHandlerMixIn, ReportsHandlerMixIn,
     MessagesStore, FileState, EmptyReport,
-    expand_modules, tokenize_module)
-from pylint.interfaces import IRawChecker, ITokenChecker, IAstroidChecker
+    expand_modules, tokenize_module, Message)
+from pylint.interfaces import IRawChecker, ITokenChecker, IAstroidChecker, CONFIDENCE_LEVELS
 from pylint.checkers import (BaseTokenChecker,
                              table_lines_from_stats,
                              initialize as checkers_initialize)
-from pylint.reporters import initialize as reporters_initialize
+from pylint.reporters import initialize as reporters_initialize, CollectingReporter
 from pylint import config
-
 from pylint.__pkginfo__ import version
 
 
+def _get_new_args(message):
+    location = (
+        message.abspath,
+        message.path,
+        message.module,
+        message.obj,
+        message.line,
+        message.column,
+    )
+    return (
+        message.msg_id,
+        message.symbol,
+        location,
+        message.msg,
+        message.confidence,
+    )
 
 def _get_python_path(filepath):
-    dirname = os.path.dirname(os.path.realpath(
-        os.path.expanduser(filepath)))
+    dirname = os.path.realpath(os.path.expanduser(filepath))
+    if not os.path.isdir(dirname):
+        dirname = os.path.dirname(dirname)
     while True:
         if not os.path.exists(os.path.join(dirname, "__init__.py")):
             return dirname
         old_dirname = dirname
         dirname = os.path.dirname(dirname)
         if old_dirname == dirname:
             return os.getcwd()
 
 
+def _merge_stats(stats):
+    merged = {}
+    for stat in stats:
+        for key, item in six.iteritems(stat):
+            if key not in merged:
+                merged[key] = item
+            else:
+                if isinstance(item, dict):
+                    merged[key].update(item)
+                else:
+                    merged[key] = merged[key] + item
+    return merged
+
+
 # Python Linter class #########################################################
 
 MSGS = {
     'F0001': ('%s',
               'fatal',
               'Used when an error occurred preventing the analysis of a \
               module (unable to find it for instance).'),
     'F0002': ('%s: %s',
               'astroid-error',
               'Used when an unexpected error occurred while building the '
@@ skipping 53 matching lines @@
     'E0011': ('Unrecognized file option %r',
               'unrecognized-inline-option',
               'Used when an unknown inline option is encountered.'),
     'E0012': ('Bad option value %r',
               'bad-option-value',
               'Used when a bad value for an inline option is encountered.'),
     }
 
 
 def _deprecated_option(shortname, opt_type):
-    def _warn_deprecated(option, optname, *args):
+    def _warn_deprecated(option, optname, *args): # pylint: disable=unused-argument
         sys.stderr.write('Warning: option %s is deprecated and ignored.\n' % (optname,))
     return {'short': shortname, 'help': 'DEPRECATED', 'hide': True,
             'type': opt_type, 'action': 'callback', 'callback': _warn_deprecated}
 
 
+if multiprocessing is not None:
+    class ChildLinter(multiprocessing.Process): # pylint: disable=no-member
+        def run(self):
+            tasks_queue, results_queue, config = self._args # pylint: disable=no-member
+
+            for file_or_module in iter(tasks_queue.get, 'STOP'):
+                result = self._run_linter(config, file_or_module[0])
+                try:
+                    results_queue.put(result)
+                except Exception as ex:
+                    print("internal error with sending report for module %s" % file_or_module, file=sys.stderr)
+                    print(ex, file=sys.stderr)
+                    results_queue.put({})
+
+        def _run_linter(self, config, file_or_module):
+            linter = PyLinter()
+
+            # Register standard checkers.
+            linter.load_default_plugins()
+            # Load command line plugins.
+            # TODO linter.load_plugin_modules(self._plugins)
+
+            linter.disable('pointless-except')
+            linter.disable('suppressed-message')
+            linter.disable('useless-suppression')
+
+            # TODO(cpopa): the sub-linters will not know all the options
+            # because they are not available here, as they are patches to
+            # PyLinter options. The following is just a hack to handle
+            # just a part of the options available in the Run class.
+
+            if 'disable_msg' in config:
+                # Disable everything again. We don't have access
+                # to the original linter though.
+                for msgid in config['disable_msg']:
+                    linter.disable(msgid)
+            for key in set(config) - set(dict(linter.options)):
+                del config[key]
+
+            config['jobs'] = 1  # Child does not parallelize any further.
+            linter.load_configuration(**config)
+            linter.set_reporter(CollectingReporter())
+
+            # Run the checks.
+            linter.check(file_or_module)
+
+            msgs = [_get_new_args(m) for m in linter.reporter.messages]
+            return (file_or_module, linter.file_state.base_name, linter.current_name,
+                    msgs, linter.stats, linter.msg_status)
+
+
 class PyLinter(OptionsManagerMixIn, MessagesHandlerMixIn, ReportsHandlerMixIn,
                BaseTokenChecker):
     """lint Python modules using external checkers.
 
     This is the main checker controlling the other ones and the reports
     generation. It is itself both a raw checker and an astroid checker in order
     to:
     * handle message activation / deactivation at the module level
     * handle some basic but necessary stats'data (number of classes, methods...)
 
     IDE plugins developpers: you may have to call
     `astroid.builder.MANAGER.astroid_cache.clear()` accross run if you want
     to ensure the latest code version is actually checked.
     """
 
     __implements__ = (ITokenChecker,)
 
     name = 'master'
     priority = 0
     level = 0
     msgs = MSGS
-    may_be_disabled = False
 
     @staticmethod
     def make_options():
         return (('ignore',
                  {'type' : 'csv', 'metavar' : '<file>[,<file>...]',
                   'dest' : 'black_list', 'default' : ('CVS',),
                   'help' : 'Add files or directories to the blacklist. '
                            'They should be base names, not paths.'}),
                 ('persistent',
                  {'default': True, 'type' : 'yn', 'metavar' : '<y_or_n>',
@@ skipping 43 matching lines @@
                            'warnings messages and the total number of '
                            'statements analyzed. This is used by the global '
                            'evaluation report (RP0004).'}),
 
                 ('comment',
                  {'default': 0, 'type' : 'yn', 'metavar' : '<y_or_n>',
                   'group': 'Reports', 'level': 1,
                   'help' : 'Add a comment according to your evaluation note. '
                            'This is used by the global evaluation report (RP0004).'}),
 
+                ('confidence',
+                 {'type' : 'multiple_choice', 'metavar': '<levels>',
+                  'default': '',
+                  'choices': [c.name for c in CONFIDENCE_LEVELS],
+                  'group': 'Messages control',
+                  'help' : 'Only show warnings with the listed confidence levels.'
+                           ' Leave empty to show all. Valid levels: %s' % (
+                               ', '.join(c.name for c in CONFIDENCE_LEVELS),)}),
+
                 ('enable',
                  {'type' : 'csv', 'metavar': '<msg ids>',
                   'short': 'e',
                   'group': 'Messages control',
                   'help' : 'Enable the message, report, category or checker with the '
                            'given id(s). You can either give multiple identifier '
                            'separated by comma (,) or put this option multiple time. '
                            'See also the "--disable" option for examples. '}),
 
                 ('disable',
@@ skipping 17 matching lines @@
                  {'type' : 'string', 'metavar': '<template>',
                   'group': 'Reports',
                   'help' : ('Template used to display messages. '
                             'This is a python new-style format string '
                             'used to format the message information. '
                             'See doc for all details')
                  }),
 
                 ('include-ids', _deprecated_option('i', 'yn')),
                 ('symbols', _deprecated_option('s', 'yn')),
+
+                ('jobs',
+                 {'type' : 'int', 'metavar': '<n-processes>',
+                  'short': 'j',
+                  'default': 1,
+                  'help' : '''Use multiple processes to speed up Pylint.''',
+                 }),
+
+                ('unsafe-load-any-extension',
+                 {'type': 'yn', 'metavar': '<yn>', 'default': False, 'hide': True,
+                  'help': ('Allow loading of arbitrary C extensions. Extensions'
+                           ' are imported into the active Python interpreter and'
+                           ' may run arbitrary code.')}),
+
+                ('extension-pkg-whitelist',
+                  {'type': 'csv', 'metavar': '<pkg[,pkg]>', 'default': [],
+                   'help': ('A comma-separated list of package or module names'
+                            ' from where C extensions may be loaded. Extensions are'
+                            ' loading into the active Python interpreter and may run'
+                            ' arbitrary code')}
+                  ),
                )
 
     option_groups = (
         ('Messages control', 'Options controling analysis messages'),
         ('Reports', 'Options related to output formating and reporting'),
         )
 
     def __init__(self, options=(), reporter=None, option_groups=(),
                  pylintrc=None):
         # some stuff has to be done before ancestors initialization...
         #
         # messages store / checkers / reporter / astroid manager
         self.msgs_store = MessagesStore()
         self.reporter = None
         self._reporter_name = None
         self._reporters = {}
-        self._checkers = {}
+        self._checkers = defaultdict(list)
+        self._pragma_lineno = {}
         self._ignore_file = False
         # visit variables
         self.file_state = FileState()
         self.current_name = None
         self.current_file = None
         self.stats = None
         # init options
         self.options = options + PyLinter.make_options()
         self.option_groups = option_groups + PyLinter.option_groups
         self._options_methods = {
@@ skipping 26 matching lines @@
             self.set_reporter(reporter)
 
     def load_default_plugins(self):
         checkers_initialize(self)
         reporters_initialize(self)
         # Make sure to load the default reporter, because
         # the option has been set before the plugins had been loaded.
         if not self.reporter:
             self._load_reporter()
 
-    def prepare_import_path(self, args):
-        """Prepare sys.path for running the linter checks."""
-        if len(args) == 1:
-            sys.path.insert(0, _get_python_path(args[0]))
-        else:
-            sys.path.insert(0, os.getcwd())
-
-    def cleanup_import_path(self):
-        """Revert any changes made to sys.path in prepare_import_path."""
-        sys.path.pop(0)
-
     def load_plugin_modules(self, modnames):
         """take a list of module names which are pylint plugins and load
         and register them
         """
         for modname in modnames:
             if modname in self._dynamic_plugins:
                 continue
             self._dynamic_plugins.add(modname)
             module = load_module_from_name(modname)
             module.register(self)
@@ skipping 35 matching lines @@
                     meth(value)
         elif optname == 'output-format':
             self._reporter_name = value
             # If the reporters are already available, load
             # the reporter class.
             if self._reporters:
                 self._load_reporter()
         try:
             BaseTokenChecker.set_option(self, optname, value, action, optdict)
         except UnsupportedAction:
-            print >> sys.stderr, 'option %s can\'t be read from config file' % \
-                  optname
+            print('option %s can\'t be read from config file' % \
+                  optname, file=sys.stderr)
 
     def register_reporter(self, reporter_class):
         self._reporters[reporter_class.name] = reporter_class
 
+    def report_order(self):
+        reports = sorted(self._reports, key=lambda x: getattr(x, 'name', ''))
+        try:
+            # Remove the current reporter and add it
+            # at the end of the list.
+            reports.pop(reports.index(self))
+        except ValueError:
+            pass
+        else:
+            reports.append(self)
+        return reports
+
     # checkers manipulation methods ############################################
 
     def register_checker(self, checker):
         """register a new checker
 
         checker is an object implementing IRawChecker or / and IAstroidChecker
         """
         assert checker.priority <= 0, 'checker priority can\'t be >= 0'
-        self._checkers.setdefault(checker.name, []).append(checker)
+        self._checkers[checker.name].append(checker)
         for r_id, r_title, r_cb in checker.reports:
             self.register_report(r_id, r_title, r_cb, checker)
         self.register_options_provider(checker)
         if hasattr(checker, 'msgs'):
             self.msgs_store.register_messages(checker)
         checker.load_defaults()
 
+        # Register the checker, but disable all of its messages.
+        # TODO(cpopa): we should have a better API for this.
+        if not getattr(checker, 'enabled', True):
+            self.disable(checker.name)
+
     def disable_noerror_messages(self):
-        for msgcat, msgids in self.msgs_store._msgs_by_category.iteritems():
+        for msgcat, msgids in six.iteritems(self.msgs_store._msgs_by_category):
             if msgcat == 'E':
                 for msgid in msgids:
                     self.enable(msgid)
             else:
                 for msgid in msgids:
                     self.disable(msgid)
 
     def disable_reporters(self):
         """disable all reporters"""
-        for reporters in self._reports.itervalues():
+        for reporters in six.itervalues(self._reports):
             for report_id, _title, _cb in reporters:
                 self.disable_report(report_id)
 
     def error_mode(self):
         """error mode: enable only errors; no reports, no persistent"""
         self.disable_noerror_messages()
         self.disable('miscellaneous')
         self.set_option('reports', False)
         self.set_option('persistent', False)
 
     # block level option handling #############################################
     #
     # see func_block_disable_msg.py test case for expected behaviour
 
     def process_tokens(self, tokens):
         """process tokens from the current module to search for module/block
         level options
         """
+        control_pragmas = {'disable', 'enable'}
         for (tok_type, content, start, _, _) in tokens:
             if tok_type != tokenize.COMMENT:
                 continue
             match = OPTION_RGX.search(content)
             if match is None:
                 continue
             if match.group(1).strip() == "disable-all" or \
                     match.group(1).strip() == 'skip-file':
                 if match.group(1).strip() == "disable-all":
                     self.add_message('deprecated-pragma', line=start[0],
                                      args=('disable-all', 'skip-file'))
                 self.add_message('file-ignored', line=start[0])
                 self._ignore_file = True
                 return
             try:
                 opt, value = match.group(1).split('=', 1)
             except ValueError:
                 self.add_message('bad-inline-option', args=match.group(1).strip(),
                                  line=start[0])
                 continue
             opt = opt.strip()
             if opt in self._options_methods or opt in self._bw_options_methods:
                 try:
                     meth = self._options_methods[opt]
                 except KeyError:
                     meth = self._bw_options_methods[opt]
                     # found a "(dis|en)able-msg" pragma deprecated suppresssion
                     self.add_message('deprecated-pragma', line=start[0], args=(opt, opt.replace('-msg', '')))
                 for msgid in splitstrip(value):
+                    # Add the line where a control pragma was encountered.
+                    if opt in control_pragmas:
+                        self._pragma_lineno[msgid] = start[0]
+
                     try:
                         if (opt, msgid) == ('disable', 'all'):
                             self.add_message('deprecated-pragma', line=start[0], args=('disable=all', 'skip-file'))
                             self.add_message('file-ignored', line=start[0])
                             self._ignore_file = True
                             return
                         meth(msgid, 'module', start[0])
                     except UnknownMessage:
                         self.add_message('bad-option-value', args=msgid, line=start[0])
             else:
                 self.add_message('unrecognized-inline-option', args=opt, line=start[0])
 
 
     # code checking methods ###################################################
 
     def get_checkers(self):
         """return all available checkers as a list"""
-        return [self] + [c for checkers in self._checkers.itervalues()
+        return [self] + [c for checkers in six.itervalues(self._checkers)
                          for c in checkers if c is not self]
 
     def prepare_checkers(self):
         """return checkers needed for activated messages and reports"""
         if not self.config.reports:
             self.disable_reporters()
         # get needed checkers
         neededcheckers = [self]
         for checker in self.get_checkers()[1:]:
             # fatal errors should not trigger enable / disabling a checker
             messages = set(msg for msg in checker.msgs
                            if msg[0] != 'F' and self.is_message_enabled(msg))
             if (messages or
                     any(self.report_is_enabled(r[0]) for r in checker.reports)):
                 neededcheckers.append(checker)
         # Sort checkers by priority
         neededcheckers = sorted(neededcheckers, key=attrgetter('priority'),
                                 reverse=True)
         return neededcheckers
 
-    def should_analyze_file(self, modname, path): # pylint: disable=unused-argument
+    def should_analyze_file(self, modname, path): # pylint: disable=unused-argument, no-self-use
         """Returns whether or not a module should be checked.
 
         This implementation returns True for all python source file, indicating
         that all files should be linted.
 
         Subclasses may override this method to indicate that modules satisfying
         certain conditions should not be linted.
 
         :param str modname: The name of the module to be checked.
         :param str path: The full path to the source code of the module.
         :returns: True if the module should be checked.
         :rtype: bool
         """
         return path.endswith('.py')
 
     def check(self, files_or_modules):
         """main checking entry: check a list of files or modules from their
         name.
         """
         # initialize msgs_state now that all messages have been registered into
         # the store
         for msg in self.msgs_store.messages:
             if not msg.may_be_emitted():
                 self._msgs_state[msg.msgid] = False
 
         if not isinstance(files_or_modules, (list, tuple)):
             files_or_modules = (files_or_modules,)
+
+        if self.config.jobs == 1:
+            self._do_check(files_or_modules)
+        else:
+            # Hack that permits running pylint, on Windows, with -m switch
+            # and with --jobs, as in 'py -2 -m pylint .. --jobs'.
+            # For more details why this is needed,
+            # see Python issue http://bugs.python.org/issue10845.
+
+            mock_main = six.PY2 and __name__ != '__main__' # -m switch
+            if mock_main:
+                sys.modules['__main__'] = sys.modules[__name__]
+            try:
+                self._parallel_check(files_or_modules)
+            finally:
+                if mock_main:
+                    sys.modules.pop('__main__')
+
+    def _parallel_task(self, files_or_modules):
+        # Prepare configuration for child linters.
+        config = vars(self.config)
+        childs = []
+        manager = multiprocessing.Manager()  # pylint: disable=no-member
+        tasks_queue = manager.Queue()  # pylint: disable=no-member
+        results_queue = manager.Queue()  # pylint: disable=no-member
+
+        for _ in range(self.config.jobs):
+            cl = ChildLinter(args=(tasks_queue, results_queue, config))
+            cl.start()  # pylint: disable=no-member
+            childs.append(cl)
+
+        # send files to child linters
+        for files_or_module in files_or_modules:
+            tasks_queue.put([files_or_module])
+
+        # collect results from child linters
+        failed = False
+        for _ in files_or_modules:
+            try:
+                result = results_queue.get()
+            except Exception as ex:
+                print("internal error while receiving results from child linter",
+                      file=sys.stderr)
+                print(ex, file=sys.stderr)
+                failed = True
+                break
+            yield result
+
+        # Stop child linters and wait for their completion.
+        for _ in range(self.config.jobs):
+            tasks_queue.put('STOP')
+        for cl in childs:
+            cl.join()
+
+        if failed:
+            print("Error occured, stopping the linter.", file=sys.stderr)
+            sys.exit(32)
+
+    def _parallel_check(self, files_or_modules):
+        # Reset stats.
+        self.open()
+
+        all_stats = []
+        for result in self._parallel_task(files_or_modules):
+            (
+                file_or_module,
+                self.file_state.base_name,
+                module,
+                messages,
+                stats,
+                msg_status
+            ) = result
+
+            if file_or_module == files_or_modules[-1]:
+                last_module = module
+
+            for msg in messages:
+                msg = Message(*msg)
+                self.set_current_module(module)
+                self.reporter.handle_message(msg)
+
+            all_stats.append(stats)
+            self.msg_status |= msg_status
+
+        self.stats = _merge_stats(chain(all_stats, [self.stats]))
+        self.current_name = last_module
+
+        # Insert stats data to local checkers.
+        for checker in self.get_checkers():
+            if checker is not self:
+                checker.stats = self.stats
+
+    def _do_check(self, files_or_modules):
         walker = PyLintASTWalker(self)
         checkers = self.prepare_checkers()
         tokencheckers = [c for c in checkers if implements(c, ITokenChecker)
                          and c is not self]
         rawcheckers = [c for c in checkers if implements(c, IRawChecker)]
         # notify global begin
         for checker in checkers:
             checker.open()
             if implements(checker, IAstroidChecker):
                 walker.add_checker(checker)
@@ skipping 16 matching lines @@
             self.file_state = FileState(descr['basename'])
             self._ignore_file = False
             # fix the current file (if the source file was not available or
             # if it's actually a c extension)
             self.current_file = astroid.file # pylint: disable=maybe-no-member
             self.check_astroid_module(astroid, walker, rawcheckers, tokencheckers)
             # warn about spurious inline messages handling
             for msgid, line, args in self.file_state.iter_spurious_suppression_messages(self.msgs_store):
                 self.add_message(msgid, line, None, args)
         # notify global end
-        self.set_current_module('')
         self.stats['statement'] = walker.nbstatements
         checkers.reverse()
         for checker in checkers:
             checker.close()
 
     def expand_files(self, modules):
         """get modules and errors from a list of modules and handle errors
         """
         result, errors = expand_modules(modules, self.config.black_list)
         for error in errors:
             message = modname = error["mod"]
             key = error["key"]
             self.set_current_module(modname)
             if key == "fatal":
                 message = str(error["ex"]).replace(os.getcwd() + os.sep, '')
             self.add_message(key, args=message)
         return result
 
     def set_current_module(self, modname, filepath=None):
         """set the name of the currently analyzed module and
         init statistics for it
         """
         if not modname and filepath is None:
             return
         self.reporter.on_set_current_module(modname, filepath)
         self.current_name = modname
         self.current_file = filepath or modname
         self.stats['by_module'][modname] = {}
         self.stats['by_module'][modname]['statement'] = 0
-        for msg_cat in MSG_TYPES.itervalues():
+        for msg_cat in six.itervalues(MSG_TYPES):
             self.stats['by_module'][modname][msg_cat] = 0
 
     def get_ast(self, filepath, modname):
         """return a ast(roid) representation for a module"""
         try:
             return MANAGER.ast_from_file(filepath, modname, source=True)
-        except SyntaxError, ex:
+        except SyntaxError as ex:
             self.add_message('syntax-error', line=ex.lineno, args=ex.msg)
-        except AstroidBuildingException, ex:
+        except AstroidBuildingException as ex:
             self.add_message('parse-error', args=ex)
-        except Exception, ex:
+        except Exception as ex: # pylint: disable=broad-except
             import traceback
             traceback.print_exc()
             self.add_message('astroid-error', args=(ex.__class__, ex))
 
     def check_astroid_module(self, astroid, walker, rawcheckers, tokencheckers):
         """check a module from its astroid representation, real work"""
+        try:
+            return self._check_astroid_module(astroid, walker,
+                                              rawcheckers, tokencheckers)
+        finally:
+            # Close file_stream, if opened, to avoid to open many files.
+            if astroid.file_stream:
+                astroid.file_stream.close()
+                # TODO(cpopa): This is an implementation detail, but it will
+                # be moved in astroid at some point.
+                # We invalidate the cached property, to let the others
+                # modules which relies on this one to get a new file stream.
+                del astroid.file_stream
+
+    def _check_astroid_module(self, astroid, walker, rawcheckers, tokencheckers):
         # call raw checkers if possible
         try:
             tokens = tokenize_module(astroid)
-        except tokenize.TokenError, ex:
+        except tokenize.TokenError as ex:
             self.add_message('syntax-error', line=ex.args[1][0], args=ex.args[0])
             return
 
         if not astroid.pure_python:
             self.add_message('raw-checker-failed', args=astroid.name)
         else:
             #assert astroid.file.endswith('.py')
             # invoke ITokenChecker interface on self to fetch module/block
             # level options
             self.process_tokens(tokens)
@@ skipping 10 matching lines @@
         walker.walk(astroid)
         return True
 
     # IAstroidChecker interface #################################################
 
     def open(self):
         """initialize counters"""
         self.stats = {'by_module' : {},
                       'by_msg' : {},
                      }
-        for msg_cat in MSG_TYPES.itervalues():
+        MANAGER.always_load_extensions = self.config.unsafe_load_any_extension
+        MANAGER.extension_package_whitelist.update(self.config.extension_pkg_whitelist)
+        for msg_cat in six.itervalues(MSG_TYPES):
             self.stats[msg_cat] = 0
 
-    def close(self):
+    def generate_reports(self):
         """close the whole package /module, it's time to make reports !
 
         if persistent run, pickle results for later comparison
         """
         if self.file_state.base_name is not None:
             # load previous results if any
             previous_stats = config.load_results(self.file_state.base_name)
             # XXX code below needs refactoring to be more reporter agnostic
             self.reporter.on_close(self.stats, previous_stats)
             if self.config.reports:
                 sect = self.make_reports(self.stats, previous_stats)
                 if self.config.files_output:
                     filename = 'pylint_global.' + self.reporter.extension
                     self.reporter.set_output(open(filename, 'w'))
             else:
                 sect = Section()
             if self.config.reports or self.config.output_format == 'html':
                 self.reporter.display_results(sect)
             # save results if persistent run
             if self.config.persistent:
                 config.save_results(self.stats, self.file_state.base_name)
         else:
+            if self.config.output_format == 'html':
+                # No output will be emitted for the html
+                # reporter if the file doesn't exist, so emit
+                # the results here.
+                self.reporter.display_results(Section())
             self.reporter.on_close(self.stats, {})
 
     # specific reports ########################################################
 
     def report_evaluation(self, sect, stats, previous_stats):
         """make the global evaluation report"""
         # check with at least check 1 statements (usually 0 when there is a
         # syntax error preventing pylint from further processing)
         if stats['statement'] == 0:
             raise EmptyReport()
         # get a global note for the code
         evaluation = self.config.evaluation
         try:
-            note = eval(evaluation, {}, self.stats)
-        except Exception, ex:
+            note = eval(evaluation, {}, self.stats) # pylint: disable=eval-used
+        except Exception as ex: # pylint: disable=broad-except
             msg = 'An exception occurred while rating: %s' % ex
         else:
             stats['global_note'] = note
             msg = 'Your code has been rated at %.2f/10' % note
             pnote = previous_stats.get('global_note')
             if pnote is not None:
                 msg += ' (previous run: %.2f/10, %+.2f)' % (pnote, note - pnote)
             if self.config.comment:
                 msg = '%s\n%s' % (msg, config.get_note_message(note))
         sect.append(Text(msg))
 
 # some reporting functions ####################################################
 
 def report_total_messages_stats(sect, stats, previous_stats):
     """make total errors / warnings report"""
     lines = ['type', 'number', 'previous', 'difference']
     lines += table_lines_from_stats(stats, previous_stats,
                                     ('convention', 'refactor',
                                      'warning', 'error'))
     sect.append(Table(children=lines, cols=4, rheaders=1))
 
 def report_messages_stats(sect, stats, _):
     """make messages type report"""
     if not stats['by_msg']:
         # don't print this report when we didn't detected any errors
         raise EmptyReport()
     in_order = sorted([(value, msg_id)
-                       for msg_id, value in stats['by_msg'].iteritems()
+                       for msg_id, value in six.iteritems(stats['by_msg'])
                        if not msg_id.startswith('I')])
     in_order.reverse()
     lines = ('message id', 'occurrences')
     for value, msg_id in in_order:
         lines += (msg_id, str(value))
     sect.append(Table(children=lines, cols=2, rheaders=1))
 
 def report_messages_by_module_stats(sect, stats, _):
     """make errors / warnings by modules report"""
     if len(stats['by_module']) == 1:
         # don't print this report when we are analysing a single module
         raise EmptyReport()
-    by_mod = {}
+    by_mod = defaultdict(dict)
     for m_type in ('fatal', 'error', 'warning', 'refactor', 'convention'):
         total = stats[m_type]
-        for module in stats['by_module'].iterkeys():
+        for module in six.iterkeys(stats['by_module']):
             mod_total = stats['by_module'][module][m_type]
             if total == 0:
                 percent = 0
             else:
                 percent = float((mod_total)*100) / total
-            by_mod.setdefault(module, {})[m_type] = percent
+            by_mod[module][m_type] = percent
     sorted_result = []
-    for module, mod_info in by_mod.iteritems():
+    for module, mod_info in six.iteritems(by_mod):
         sorted_result.append((mod_info['error'],
                               mod_info['warning'],
                               mod_info['refactor'],
                               mod_info['convention'],
                               module))
     sorted_result.sort()
     sorted_result.reverse()
     lines = ['module', 'error', 'warning', 'refactor', 'convention']
     for line in sorted_result:
-        if line[0] == 0 and line[1] == 0:
-            break
+        # Don't report clean modules.
+        if all(entry == 0 for entry in line[:-1]):
+            continue
         lines.append(line[-1])
         for val in line[:-1]:
             lines.append('%.2f' % val)
     if len(lines) == 5:
         raise EmptyReport()
     sect.append(Table(children=lines, cols=5, rheaders=1))
 
 
 # utilities ###################################################################
 
-# this may help to import modules using gettext
-# XXX syt, actually needed since we don't import code?
-
-from logilab.common.compat import builtins
-builtins._ = str
-
 
 class ArgumentPreprocessingError(Exception):
     """Raised if an error occurs during argument preprocessing."""
 
 
 def preprocess_options(args, search_for):
     """look for some options (keys of <search_for>) which have to be processed
     before others
 
     values of <search_for> are callback functions to call when the option is
@@ skipping 19 matching lines @@
                         raise ArgumentPreprocessingError(msg)
                     val = args[i]
                     del args[i]
                 elif not takearg and val is not None:
                     msg = "Option %s doesn't expects a value" % option
                     raise ArgumentPreprocessingError(msg)
                 cb(option, val)
         else:
             i += 1
 
+
+@contextmanager
+def fix_import_path(args):
+    """Prepare sys.path for running the linter checks.
+
+    Within this context, each of the given arguments is importable.
+    Paths are added to sys.path in corresponding order to the arguments.
+    We avoid adding duplicate directories to sys.path.
+    `sys.path` is reset to its original value upon exitign this context.
+    """
+    orig = list(sys.path)
+    changes = []
+    for arg in args:
+        path = _get_python_path(arg)
+        if path in changes:
+            continue
+        else:
+            changes.append(path)
+    sys.path[:] = changes + sys.path
+    try:
+        yield
+    finally:
+        sys.path[:] = orig
+
+
 class Run(object):
     """helper class to use as main for pylint :
 
     run(*sys.argv[1:])
     """
     LinterClass = PyLinter
     option_groups = (
         ('Commands', 'Options which are actually commands. Options in this \
 group are mutually exclusive.'),
         )
 
     def __init__(self, args, reporter=None, exit=True):
         self._rcfile = None
         self._plugins = []
         try:
             preprocess_options(args, {
                 # option: (callback, takearg)
                 'init-hook':   (cb_init_hook, True),
                 'rcfile':       (self.cb_set_rcfile, True),
                 'load-plugins': (self.cb_add_plugins, True),
                 })
-        except ArgumentPreprocessingError, ex:
-            print >> sys.stderr, ex
+        except ArgumentPreprocessingError as ex:
+            print(ex, file=sys.stderr)
             sys.exit(32)
 
         self.linter = linter = self.LinterClass((
             ('rcfile',
              {'action' : 'callback', 'callback' : lambda *args: 1,
               'type': 'string', 'metavar': '<file>',
               'help' : 'Specify a configuration file.'}),
 
             ('init-hook',
              {'action' : 'callback', 'callback' : lambda *args: 1,
               'type' : 'string', 'metavar': '<code>',
               'level': 1,
               'help' : 'Python code to execute, usually for sys.path '
                        'manipulation such as pygtk.require().'}),
 
             ('help-msg',
              {'action' : 'callback', 'type' : 'string', 'metavar': '<msg-id>',
               'callback' : self.cb_help_message,
               'group': 'Commands',
               'help' : 'Display a help message for the given message id and '
                        'exit. The value may be a comma separated list of message ids.'}),
 
             ('list-msgs',
              {'action' : 'callback', 'metavar': '<msg-id>',
               'callback' : self.cb_list_messages,
               'group': 'Commands', 'level': 1,
               'help' : "Generate pylint's messages."}),
 
+            ('list-conf-levels',
+             {'action' : 'callback',
+              'callback' : cb_list_confidence_levels,
+              'group': 'Commands', 'level': 1,
+              'help' : "Generate pylint's messages."}),
+
             ('full-documentation',
              {'action' : 'callback', 'metavar': '<msg-id>',
               'callback' : self.cb_full_documentation,
               'group': 'Commands', 'level': 1,
               'help' : "Generate pylint's full documentation."}),
 
             ('generate-rcfile',
              {'action' : 'callback', 'callback' : self.cb_generate_config,
               'group': 'Commands',
               'help' : 'Generate a sample configuration file according to '
                        'the current configuration. You can put other options '
                        'before this one to get them in the generated '
                        'configuration.'}),
 
             ('generate-man',
              {'action' : 'callback', 'callback' : self.cb_generate_manpage,
               'group': 'Commands',
               'help' : "Generate pylint's man page.", 'hide': True}),
 
             ('errors-only',
              {'action' : 'callback', 'callback' : self.cb_error_mode,
               'short': 'E',
               'help' : 'In error mode, checkers without error messages are '
                        'disabled and for others, only the ERROR messages are '
                        'displayed, and no reports are done by default'''}),
 
+            ('py3k',
+             {'action' : 'callback', 'callback' : self.cb_python3_porting_mode,
+              'help' : 'In Python 3 porting mode, all checkers will be '
+                       'disabled and only messages emitted by the porting '
+                       'checker will be displayed'}),
+
             ('profile',
              {'type' : 'yn', 'metavar' : '<y_or_n>',
               'default': False, 'hide': True,
               'help' : 'Profiled execution.'}),
 
             ), option_groups=self.option_groups, pylintrc=self._rcfile)
         # register standard checkers
         linter.load_default_plugins()
         # load command line plugins
         linter.load_plugin_modules(self._plugins)
@@ skipping 43 matching lines @@
         # now we can load file config and command line, plugins (which can
         # provide options) have been registered
         linter.load_config_file()
         if reporter:
             # if a custom reporter is provided as argument, it may be overridden
             # by file parameters, so re-set it here, but before command line
             # parsing so it's still overrideable by command line option
             linter.set_reporter(reporter)
         try:
             args = linter.load_command_line_configuration(args)
-        except SystemExit, exc:
+        except SystemExit as exc:
             if exc.code == 2: # bad options
                 exc.code = 32
             raise
         if not args:
-            print linter.help()
+            print(linter.help())
             sys.exit(32)
+
+        if linter.config.jobs < 0:
+            print("Jobs number (%d) should be greater than 0"
+                  % linter.config.jobs, file=sys.stderr)
+            sys.exit(32)
+        if linter.config.jobs > 1 or linter.config.jobs == 0:
+            if multiprocessing is None:
+                print("Multiprocessing library is missing, "
+                      "fallback to single process", file=sys.stderr)
+                linter.set_option("jobs", 1)
+            else:
+                if linter.config.jobs == 0:
+                    linter.config.jobs = multiprocessing.cpu_count()
+
         # insert current working directory to the python path to have a correct
         # behaviour
-        linter.prepare_import_path(args)
-        if self.linter.config.profile:
-            print >> sys.stderr, '** profiled run'
-            import cProfile, pstats
-            cProfile.runctx('linter.check(%r)' % args, globals(), locals(),
-                            'stones.prof')
-            data = pstats.Stats('stones.prof')
-            data.strip_dirs()
-            data.sort_stats('time', 'calls')
-            data.print_stats(30)
-        else:
-            linter.check(args)
-        linter.cleanup_import_path()
+        with fix_import_path(args):
+            if self.linter.config.profile:
+                print('** profiled run', file=sys.stderr)
+                import cProfile, pstats
+                cProfile.runctx('linter.check(%r)' % args, globals(), locals(),
+                                'stones.prof')
+                data = pstats.Stats('stones.prof')
+                data.strip_dirs()
+                data.sort_stats('time', 'calls')
+                data.print_stats(30)
+            else:
+                linter.check(args)
+            linter.generate_reports()
         if exit:
             sys.exit(self.linter.msg_status)
 
     def cb_set_rcfile(self, name, value):
         """callback for option preprocessing (i.e. before option parsing)"""
         self._rcfile = value
 
     def cb_add_plugins(self, name, value):
         """callback for option preprocessing (i.e. before option parsing)"""
         self._plugins.extend(splitstrip(value))
@@ skipping 27 matching lines @@
     def cb_full_documentation(self, option, optname, value, parser):
         """optik callback for printing full documentation"""
         self.linter.print_full_documentation()
         sys.exit(0)
 
     def cb_list_messages(self, option, optname, value, parser): # FIXME
         """optik callback for printing available messages"""
         self.linter.msgs_store.list_messages()
         sys.exit(0)
 
+    def cb_python3_porting_mode(self, *args, **kwargs):
+        """Activate only the python3 porting checker."""
+        self.linter.disable('all')
+        self.linter.enable('python3')
+
+
+def cb_list_confidence_levels(option, optname, value, parser):
+    for level in CONFIDENCE_LEVELS:
+        print('%-18s: %s' % level)
+    sys.exit(0)
+
 def cb_init_hook(optname, value):
     """exec arbitrary code to set sys.path for instance"""
-    exec value
+    exec(value) # pylint: disable=exec-used
 
 
 if __name__ == '__main__':
     Run(sys.argv[1:])