Merge pull request #1404 from PyCQA/drop-xdg-config

Drop support for Home and XDG config files

6 files changed, 49 insertions, 157 deletions

diff --git a/docs/source/internal/option_handling.rst b/docs/source/internal/option_handling.rst
index 21d6362..00c688f 100644
--- a/docs/source/internal/option_handling.rst
+++ b/docs/source/internal/option_handling.rst
@@ -129,13 +129,8 @@ In |Flake8| 2, configuration file discovery and management was handled by
 pep8.  In pep8's 1.6 release series, it drastically broke how discovery and
 merging worked (as a result of trying to improve it). To avoid a dependency
 breaking |Flake8| again in the future, we have created our own discovery and
-management.
-As part of managing this ourselves, we decided to change management/discovery
-for 3.0.0. We have done the following:
-
-- User files (files stored in a user's home directory or in the XDG directory
-  inside their home directory) are the first files read. For example, if the
-  user has a ``~/.flake8`` file, we will read that first.
+management in 3.0.0. In 4.0.0 we have once again changed how this works and we
+removed support for user-level config files.
 
 - Project files (files stored in the current directory) are read next and
   merged on top of the user file. In other words, configuration in project
@@ -157,7 +152,7 @@ To facilitate the configuration file management, we've taken a different
 approach to discovery and management of files than pep8. In pep8 1.5, 1.6, and
 1.7 configuration discovery and management was centralized in `66 lines of
 very terse python`_ which was confusing and not very explicit. The terseness
-of this function (|Flake8|'s authors believe) caused the confusion and
+of this function (|Flake8| 3.0.0's authors believe) caused the confusion and
 problems with pep8's 1.6 series. As such, |Flake8| has separated out
 discovery, management, and merging into a module to make reasoning about each
 of these pieces easier and more explicit (as well as easier to test).
@@ -176,23 +171,19 @@ to parse those configuration files.
 .. note:: ``local_config_files`` also filters out non-existent files.
 
 Configuration file merging and managemnt is controlled by the
-:class:`~flake8.options.config.MergedConfigParser`. This requires the instance
+:class:`~flake8.options.config.ConfigParser`. This requires the instance
 of :class:`~flake8.options.manager.OptionManager` that the program is using,
 the list of appended config files, and the list of extra arguments. This
 object is currently the sole user of the
 :class:`~flake8.options.config.ConfigFileFinder` object. It appropriately
 initializes the object and uses it in each of
 
-- :meth:`~flake8.options.config.MergedConfigParser.parse_cli_config`
-- :meth:`~flake8.options.config.MergedConfigParser.parse_local_config`
-- :meth:`~flake8.options.config.MergedConfigParser.parse_user_config`
+- :meth:`~flake8.options.config.ConfigParser.parse_cli_config`
+- :meth:`~flake8.options.config.ConfigParser.parse_local_config`
 
-Finally,
-:meth:`~flake8.options.config.MergedConfigParser.merge_user_and_local_config`
-takes the user and local configuration files that are parsed by
-:meth:`~flake8.options.config.MergedConfigParser.parse_local_config` and
-:meth:`~flake8.options.config.MergedConfigParser.parse_user_config`. The
-main usage of the ``MergedConfigParser`` is in
+Finally, :meth:`~flake8.options.config.ConfigParser.parse` returns the
+appropriate configuration dictionary for this execution of |Flake8|. The
+main usage of the ``ConfigParser`` is in
 :func:`~flake8.options.aggregator.aggregate_options`.
 
 Aggregating Configuration File and Command Line Arguments
@@ -201,7 +192,7 @@ Aggregating Configuration File and Command Line Arguments
 :func:`~flake8.options.aggregator.aggregate_options` accepts an instance of
 :class:`~flake8.options.manager.OptionManager` and does the work to parse the
 command-line arguments passed by the user necessary for creating an instance
-of :class:`~flake8.options.config.MergedConfigParser`.
+of :class:`~flake8.options.config.ConfigParser`.
 
 After parsing the configuration file, we determine the default ignore list. We
 use the defaults from the OptionManager and update those with the parsed
@@ -229,6 +220,6 @@ API Documentation
     :members:
     :special-members:
 
-.. autoclass:: flake8.options.config.MergedConfigParser
+.. autoclass:: flake8.options.config.ConfigParser
     :members:
     :special-members:
diff --git a/docs/source/release-notes/4.0.0.rst b/docs/source/release-notes/4.0.0.rst
new file mode 100644
index 0000000..e997d09
--- /dev/null
+++ b/docs/source/release-notes/4.0.0.rst
@@ -0,0 +1,16 @@
+4.0.0 -- 202x-mm-dd
+-------------------
+
+You can view the `4.0.0 milestone`_ on GitHub for more details.
+
+Backwards Incompatible Changes
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- Due to constant confusion by users, user-level |Flake8| configuration files
+  are no longer supported. Files will not be searched for in the user's home
+  directory (e.g., ``~/.flake8``) nor in the XDG config directory (e.g.,
+  ``~/.config/flake8``).
+
+.. all links
+.. _4.0.0 milestone:
+    https://github.com/PyCQA/flake8/milestone/39
diff --git a/docs/source/release-notes/index.rst b/docs/source/release-notes/index.rst
index dd20253..3617ff4 100644
--- a/docs/source/release-notes/index.rst
+++ b/docs/source/release-notes/index.rst
@@ -5,6 +5,12 @@
 All of the release notes that have been recorded for Flake8 are organized here
 with the newest releases first.
 
+4.x Release Series
+==================
+
+.. toctree::
+   4.0.0
+
 3.x Release Series
 ==================
 
diff --git a/src/flake8/options/aggregator.py b/src/flake8/options/aggregator.py
index 40848a2..73a0f36 100644
--- a/src/flake8/options/aggregator.py
+++ b/src/flake8/options/aggregator.py
@@ -38,7 +38,7 @@ def aggregate_options(
     default_values, _ = manager.parse_args([])
 
     # Make our new configuration file mergerator
-    config_parser = config.MergedConfigParser(
+    config_parser = config.ConfigParser(
         option_manager=manager, config_finder=config_finder
     )
 
diff --git a/src/flake8/options/config.py b/src/flake8/options/config.py
index e920e58..fc3b205 100644
--- a/src/flake8/options/config.py
+++ b/src/flake8/options/config.py
@@ -11,7 +11,7 @@ from flake8 import utils
 
 LOG = logging.getLogger(__name__)
 
-__all__ = ("ConfigFileFinder", "MergedConfigParser")
+__all__ = ("ConfigFileFinder", "ConfigParser")
 
 
 class ConfigFileFinder:
@@ -48,7 +48,6 @@ class ConfigFileFinder:
 
         # User configuration file.
         self.program_name = program_name
-        self.user_config_file = self._user_config_file(program_name)
 
         # List of filenames to find in the local/project directory
         self.project_filenames = ("setup.cfg", "tox.ini", f".{program_name}")
@@ -56,19 +55,6 @@ class ConfigFileFinder:
         self.local_directory = os.path.abspath(os.curdir)
 
     @staticmethod
-    def _user_config_file(program_name: str) -> str:
-        if utils.is_windows():
-            home_dir = os.path.expanduser("~")
-            config_file_basename = f".{program_name}"
-        else:
-            home_dir = os.environ.get(
-                "XDG_CONFIG_HOME", os.path.expanduser("~/.config")
-            )
-            config_file_basename = program_name
-
-        return os.path.join(home_dir, config_file_basename)
-
-    @staticmethod
     def _read_config(
         *files: str,
     ) -> Tuple[configparser.RawConfigParser, List[str]]:
@@ -146,15 +132,8 @@ class ConfigFileFinder:
         """Parse all local config files into one config object."""
         return self.local_configs_with_files()[0]
 
-    def user_config(self):
-        """Parse the user config file into a config object."""
-        config, found_files = self._read_config(self.user_config_file)
-        if found_files:
-            LOG.debug("Found user configuration files: %s", found_files)
-        return config
-
 
-class MergedConfigParser:
+class ConfigParser:
     """Encapsulate merging different types of configuration files.
 
     This parses out the options registered that were specified in the
@@ -167,7 +146,7 @@ class MergedConfigParser:
     GETBOOL_ACTIONS = {"store_true", "store_false"}
 
     def __init__(self, option_manager, config_finder):
-        """Initialize the MergedConfigParser instance.
+        """Initialize the ConfigParser instance.
 
         :param flake8.options.manager.OptionManager option_manager:
             Initialized OptionManager.
@@ -239,19 +218,6 @@ class MergedConfigParser:
         LOG.debug("Parsing local configuration files.")
         return self._parse_config(config)
 
-    def parse_user_config(self):
-        """Parse and return the user configuration files."""
-        config = self.config_finder.user_config()
-        if not self.is_configured_by(config):
-            LOG.debug(
-                "User configuration files have no %s section",
-                self.program_name,
-            )
-            return {}
-
-        LOG.debug("Parsing user configuration files.")
-        return self._parse_config(config)
-
     def parse_cli_config(self, config_path):
         """Parse and return the file specified by --config."""
         config = self.config_finder.cli_config(config_path)
@@ -265,28 +231,8 @@ class MergedConfigParser:
         LOG.debug("Parsing CLI configuration files.")
         return self._parse_config(config, os.path.dirname(config_path))
 
-    def merge_user_and_local_config(self):
-        """Merge the parsed user and local configuration files.
-
-        :returns:
-            Dictionary of the parsed and merged configuration options.
-        :rtype:
-            dict
-        """
-        user_config = self.parse_user_config()
-        config = self.parse_local_config()
-
-        for option, value in user_config.items():
-            config.setdefault(option, value)
-
-        return config
-
     def parse(self):
-        """Parse and return the local and user config files.
-
-        First this copies over the parsed local configuration and then
-        iterates over the options in the user configuration and sets them if
-        they were not set by the local configuration file.
+        """Parse and return the local config files.
 
         :returns:
             Dictionary of parsed configuration options
@@ -309,7 +255,7 @@ class MergedConfigParser:
             )
             return self.parse_cli_config(self.config_finder.config_file)
 
-        return self.merge_user_and_local_config()
+        return self.parse_local_config()
 
 
 def get_local_plugins(config_finder):
diff --git a/tests/unit/test_merged_config_parser.py b/tests/unit/test_config_parser.py
index b19291c..0baa108 100644
--- a/tests/unit/test_merged_config_parser.py
+++ b/tests/unit/test_config_parser.py
@@ -1,4 +1,4 @@
-"""Unit tests for flake8.options.config.MergedConfigParser."""
+"""Unit tests for flake8.options.config.ConfigParser."""
 import os
 from unittest import mock
 
@@ -32,7 +32,7 @@ def test_parse_cli_config(optmanager, config_finder):
         "--ignore", parse_from_config=True, comma_separated_list=True
     )
     optmanager.add_option("--quiet", parse_from_config=True, action="count")
-    parser = config.MergedConfigParser(optmanager, config_finder)
+    parser = config.ConfigParser(optmanager, config_finder)
 
     config_file = "tests/fixtures/config_files/cli-specified.ini"
     parsed_config = parser.parse_cli_config(config_file)
@@ -61,41 +61,11 @@ def test_is_configured_by(
 ):
     """Verify the behaviour of the is_configured_by method."""
     parsed_config, _ = config.ConfigFileFinder._read_config(filename)
-    parser = config.MergedConfigParser(optmanager, config_finder)
+    parser = config.ConfigParser(optmanager, config_finder)
 
     assert parser.is_configured_by(parsed_config) is is_configured_by
 
 
-def test_parse_user_config(optmanager, config_finder):
-    """Verify parsing of user config files."""
-    optmanager.add_option(
-        "--exclude",
-        parse_from_config=True,
-        comma_separated_list=True,
-        normalize_paths=True,
-    )
-    optmanager.add_option(
-        "--ignore", parse_from_config=True, comma_separated_list=True
-    )
-    optmanager.add_option("--quiet", parse_from_config=True, action="count")
-    parser = config.MergedConfigParser(optmanager, config_finder)
-
-    config_finder.user_config_file = (
-        "tests/fixtures/config_files/" "cli-specified.ini"
-    )
-    parsed_config = parser.parse_user_config()
-
-    assert parsed_config == {
-        "ignore": ["E123", "W234", "E111"],
-        "exclude": [
-            os.path.abspath("foo/"),
-            os.path.abspath("bar/"),
-            os.path.abspath("bogus/"),
-        ],
-        "quiet": 1,
-    }
-
-
 def test_parse_local_config(optmanager, config_finder):
     """Verify parsing of local config files."""
     optmanager.add_option(
@@ -108,7 +78,7 @@ def test_parse_local_config(optmanager, config_finder):
         "--ignore", parse_from_config=True, comma_separated_list=True
     )
     optmanager.add_option("--quiet", parse_from_config=True, action="count")
-    parser = config.MergedConfigParser(optmanager, config_finder)
+    parser = config.ConfigParser(optmanager, config_finder)
 
     with mock.patch.object(config_finder, "local_config_files") as localcfs:
         localcfs.return_value = [
@@ -127,47 +97,14 @@ def test_parse_local_config(optmanager, config_finder):
     }
 
 
-def test_merge_user_and_local_config(optmanager, config_finder):
-    """Verify merging of parsed user and local config files."""
-    optmanager.add_option(
-        "--exclude",
-        parse_from_config=True,
-        comma_separated_list=True,
-        normalize_paths=True,
-    )
-    optmanager.add_option(
-        "--ignore", parse_from_config=True, comma_separated_list=True
-    )
-    optmanager.add_option(
-        "--select", parse_from_config=True, comma_separated_list=True
-    )
-    parser = config.MergedConfigParser(optmanager, config_finder)
-
-    with mock.patch.object(config_finder, "local_config_files") as localcfs:
-        localcfs.return_value = [
-            "tests/fixtures/config_files/local-config.ini"
-        ]
-        config_finder.user_config_file = (
-            "tests/fixtures/config_files/" "user-config.ini"
-        )
-        parsed_config = parser.merge_user_and_local_config()
-
-    assert parsed_config == {
-        "exclude": [os.path.abspath("docs/")],
-        "ignore": ["D203"],
-        "select": ["E", "W", "F"],
-    }
-
-
 def test_parse_isolates_config(optmanager):
     """Verify behaviour of the parse method with isolated=True."""
     config_finder = mock.MagicMock()
     config_finder.ignore_config_files = True
-    parser = config.MergedConfigParser(optmanager, config_finder)
+    parser = config.ConfigParser(optmanager, config_finder)
 
     assert parser.parse() == {}
     assert config_finder.local_configs.called is False
-    assert config_finder.user_config.called is False
 
 
 def test_parse_uses_cli_config(optmanager):
@@ -176,7 +113,7 @@ def test_parse_uses_cli_config(optmanager):
     config_finder = mock.MagicMock()
     config_finder.config_file = config_file_value
     config_finder.ignore_config_files = False
-    parser = config.MergedConfigParser(optmanager, config_finder)
+    parser = config.ConfigParser(optmanager, config_finder)
 
     parser.parse()
     config_finder.cli_config.assert_called_once_with(config_file_value)
@@ -206,13 +143,11 @@ def test_parsed_configs_are_equivalent(
     optmanager.add_option(
         "--ignore", parse_from_config=True, comma_separated_list=True
     )
-    parser = config.MergedConfigParser(optmanager, config_finder)
+    parser = config.ConfigParser(optmanager, config_finder)
 
     with mock.patch.object(config_finder, "local_config_files") as localcfs:
         localcfs.return_value = [config_fixture_path]
-        with mock.patch.object(config_finder, "user_config_file") as usercf:
-            usercf.return_value = ""
-            parsed_config = parser.merge_user_and_local_config()
+        parsed_config = parser.parse()
 
     assert parsed_config["ignore"] == ["E123", "W234", "E111"]
     assert parsed_config["exclude"] == [
@@ -243,13 +178,11 @@ def test_parsed_hyphenated_and_underscored_names(
         parse_from_config=True,
         comma_separated_list=True,
     )
-    parser = config.MergedConfigParser(optmanager, config_finder)
+    parser = config.ConfigParser(optmanager, config_finder)
 
     with mock.patch.object(config_finder, "local_config_files") as localcfs:
         localcfs.return_value = [config_file]
-        with mock.patch.object(config_finder, "user_config_file") as usercf:
-            usercf.return_value = ""
-            parsed_config = parser.merge_user_and_local_config()
+        parsed_config = parser.parse()
 
     assert parsed_config["max_line_length"] == 110
     assert parsed_config["enable_extensions"] == ["H101", "H235"]