WIP - test by Adrien

Add a section into the doc about how to develop rules' plugins.

.github/workflows/ci.yaml

@@ -1,54 +0,0 @@
----
-
-name: CI
-
-on:  # yamllint disable-line rule:truthy
-  push:
-  pull_request:
-    branches:
-      - master
-
-jobs:
-  lint:
-    name: Linters
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Set up Python
-        uses: actions/setup-python@v2
-        with:
-          python-version: 3.9
-      - run: python -m pip install flake8 flake8-import-order doc8 sphinx
-      - run: python -m pip install .
-      - run: flake8 .
-      - run: doc8 $(git ls-files '*.rst')
-      - run: yamllint --strict $(git ls-files '*.yaml' '*.yml')
-      - run: python setup.py build_sphinx
-
-  test:
-    name: Tests
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version:
-          - 3.5
-          - 3.6
-          - 3.7
-          - 3.8
-          - 3.9
-          - nightly
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Set up Python ${{ matrix.pyver }}
-        uses: actions/setup-python@v2
-        with:
-          python-version: ${{ matrix.pyver }}
-      - name: Fix GitHub Actions path
-        run: echo /home/runner/.local/bin >>$GITHUB_PATH
-      - run: pip install coveralls
-      - run: pip install .
-      - run: coverage run --source=yamllint -m unittest discover
-      - name: Coveralls
-        uses: AndreMiras/coveralls-python-action@develop

.travis.yml

@@ -0,0 +1,28 @@
+---
+dist: xenial  # required for Python >= 3.7 (travis-ci/travis-ci#9069)
+language: python
+python:
+  - 2.7
+  - 3.5
+  - 3.6
+  - 3.7
+  - 3.8
+  - nightly
+env:
+  - REMOVE_LOCALES=false
+  - REMOVE_LOCALES=true
+install:
+  - pip install pyyaml coveralls flake8 flake8-import-order doc8
+  - if [[ $TRAVIS_PYTHON_VERSION != 2* ]]; then pip install sphinx; fi
+  - pip install .
+  - if [[ $REMOVE_LOCALES = "true" ]]; then sudo rm -rf /usr/lib/locale/*; fi
+script:
+  - if [[ $TRAVIS_PYTHON_VERSION != nightly ]]; then flake8 .; fi
+  - if [[ $TRAVIS_PYTHON_VERSION != 2* ]]; then doc8 $(git ls-files '*.rst'); fi
+  - yamllint --strict $(git ls-files '*.yaml' '*.yml')
+  - coverage run --source=yamllint -m unittest discover
+  - if [[ $TRAVIS_PYTHON_VERSION != 2* ]]; then
+      python setup.py build_sphinx;
+    fi
+after_success:
+  coveralls

CHANGELOG.rst

@@ -1,37 +1,11 @@
 Changelog
 =========
 
-1.26.3 (2021-08-21)
--------------------
-
-- Restore runtime dependency ``setuptools`` for Python < 3.8
-
-1.26.2 (2021-08-03)
--------------------
-
-- Fix ``python_requires`` to comply with PEP 345 and PEP 440
-
-1.26.1 (2021-04-06)
--------------------
-
-- Remove runtime dependency ``setuptools`` for Python < 3.8
-- Fix ``line_length`` to skip all hash signs starting comment
-
-1.26.0 (2021-01-29)
--------------------
-
-- End support for Python 2 and Python 3.4, add support for Python 3.9
-- Add ``forbid: non-empty`` option to ``braces`` and ``brackets`` rules
-- Fix ``quoted-strings`` for explicit octal recognition
-- Add documentation for integration with Arcanist
-- Fix typos in changelog and README
-- Stop using deprecated ``python setup.py test`` in tests
-
 1.25.0 (2020-09-29)
 -------------------
 
 - Run tests on Travis both with and without UTF-8 locales
-- Improve documentation with default values to rules with options
+- Improve documentationon with default values to rules with options
 - Improve documentation with a Python API usage example
 - Fix documentation on ``commas`` examples
 - Packaging: move setuptools' configuration from ``setup.py`` to ``setup.cfg``

README.rst

@@ -19,7 +19,11 @@ indentation, etc.
    :target: https://yamllint.readthedocs.io/en/latest/?badge=latest
    :alt: Documentation status
 
-Written in Python (compatible with Python 3 only).
+Written in Python (compatible with Python 2 & 3).
+
+⚠ Python 2 upstream support stopped on January 1, 2020. yamllint will keep
+best-effort support for Python 2.7 until January 1, 2021. Passed that date,
+yamllint will drop all Python 2-related code.
 
 Documentation
 -------------

docs/development.rst

@@ -16,3 +16,47 @@ Basic example of running the linter from Python:
 
 .. automodule:: yamllint.linter
    :members:
+
+Develop rule plugins
+---------------------
+
+yamllint provides a plugin mechanism using setuptools (pkg_resources) to allow
+adding custom rules. So, you can extend yamllint and add rules with your own
+custom yamllint rule plugins if you developed them.
+
+Yamllint rule plugins must satisfy the followings.
+
+#. It must be a Python package installable using pip and distributed under
+   GPLv3+ same as yamllint.
+#. It must contains the entry point configuration in ``setup.cfg`` or something
+   similar packaging configuration files, to make it installed and working as a
+   yamllint plugin like below. (``<plugin_name>`` is that plugin name and
+   ``<plugin_src_dir>`` is a dir where the rule modules exist.)
+   ::
+
+     [options.entry_points]
+     yamllint.plugins.rules =
+          <plugin_name> = <plugin_src_dir>
+
+#. It must contain custom yamllint rule modules:
+
+   - Each rule module must define a couple of global variables, ID and TYPE. ID
+     must not conflicts with other rules' ID.
+   - Each rule module must define a function named 'check' to test input data
+     complies with the rule.
+   - Each rule module may have other global variables.
+
+     - CONF to define its configuration parameters and those types.
+     - DEFAULT to provide default values for each configuration parameters.
+
+#. It must define a global variable RULES_MAP to provide mappings of rule ID
+   and rule modules to yamllint like this.
+   ::
+
+     RULES_MAP = {
+         # rule ID: rule module
+         a_custom_rule.ID: a_custom_rule
+     }
+
+To develop yamllint rules, the default rules themselves in yamllint may become
+good references.

docs/integration.rst

@@ -51,22 +51,3 @@ An example workflow using GitHub Actions:
 
          - name: Lint YAML files
            run: yamllint .
-
-Integration with Arcanist
--------------------------
-
-You can configure yamllint to run on ``arc lint``. Here is an example
-``.arclint`` file that makes use of this configuration.
-
-.. code:: json
-
-  {
-    "linters": {
-      "yamllint": {
-        "type": "script-and-regex",
-        "script-and-regex.script": "yamllint",
-        "script-and-regex.regex": "/^(?P<line>\\d+):(?P<offset>\\d+) +(?P<severity>warning|error) +(?P<message>.*) +\\((?P<name>.*)\\)$/m",
-        "include": "(\\.(yml|yaml)$)"
-      }
-    }
-  }

setup.cfg

@@ -26,12 +26,14 @@ classifiers =
   Environment :: Console
   Intended Audience :: Developers
   License :: OSI Approved :: GNU General Public License v3 (GPLv3)
+  Programming Language :: Python :: 2
+  Programming Language :: Python :: 2.7
   Programming Language :: Python :: 3
+  Programming Language :: Python :: 3.4
   Programming Language :: Python :: 3.5
   Programming Language :: Python :: 3.6
   Programming Language :: Python :: 3.7
   Programming Language :: Python :: 3.8
-  Programming Language :: Python :: 3.9
   Topic :: Software Development
   Topic :: Software Development :: Debuggers
   Topic :: Software Development :: Quality Assurance
@@ -46,7 +48,7 @@ project_urls =
 [options]
 packages = find:
 
-python_requires = >=3.5
+python_requires = >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*
 
 include_package_data = True
 install_requires =
@@ -67,6 +69,3 @@ yamllint = conf/*.yaml
 [options.entry_points]
 console_scripts =
   yamllint = yamllint.cli:run
-
-[coverage:run]
-relative_files = True

tests/plugins/example/__init__.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2020 Satoru SATOH
+#
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+
+"""yamllint plugin entry point
+"""
+from __future__ import absolute_import
+
+from . import override_comments
+
+
+RULES_MAP = {
+    override_comments.ID: override_comments
+}

tests/plugins/example/override_comments.py

@@ -0,0 +1,63 @@
+#
+# Copyright (C) 2020 Satoru SATOH
+#
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+#
+"""
+Use this rule to override some comments' rules.
+
+.. rubric:: Options
+
+* Use ``forbid`` to control comments. Set to ``true`` to forbid comments
+  completely.
+
+.. rubric:: Examples
+
+#. With ``override-comments: {forbid: true}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    foo: 1
+
+   the following code snippet would **FAIL**:
+   ::
+
+    # baz
+    foo: 1
+
+.. rubric:: Default values (when enabled)
+
+.. code-block:: yaml
+
+rules:
+  override-comments:
+    forbid: False
+
+"""
+from yamllint.linter import LintProblem
+
+
+ID = 'override-comments'
+TYPE = 'comment'
+CONF = {'forbid': bool}
+DEFAULT = {'forbid': False}
+
+
+def check(conf, comment):
+    """Check if comments are found.
+    """
+    if conf['forbid']:
+        yield LintProblem(comment.line_no, comment.column_no,
+                          'forbidden comment')

tests/plugins/yamllint_plugin_example/setup.cfg

@@ -0,0 +1,11 @@
+[metadata]
+name = yamllint_plugin_example
+version = 1.0.0
+
+[options]
+packages = find:
+install_requires = yamllint
+
+[options.entry_points]
+yamllint.plugins.rules =
+    example = yamllint_plugin_example

tests/plugins/yamllint_plugin_example/setup.py

@@ -0,0 +1,2 @@
+import setuptools
+setuptools.setup()

tests/plugins/yamllint_plugin_example/yamllint_plugin_example/__init__.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2020 Satoru SATOH
+#
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+
+"""yamllint plugin entry point
+"""
+from __future__ import absolute_import
+
+from . import override_comments, random_failure
+
+
+RULES_MAP = {
+    override_comments.ID: override_comments,
+    random_failure.ID: random_failure,
+}

tests/plugins/yamllint_plugin_example/yamllint_plugin_example/override_comments.py

@@ -0,0 +1,63 @@
+#
+# Copyright (C) 2020 Satoru SATOH
+#
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+#
+"""
+Use this rule to override some comments' rules.
+
+.. rubric:: Options
+
+* Use ``forbid`` to control comments. Set to ``true`` to forbid comments
+  completely.
+
+.. rubric:: Examples
+
+#. With ``override-comments: {forbid: true}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    foo: 1
+
+   the following code snippet would **FAIL**:
+   ::
+
+    # baz
+    foo: 1
+
+.. rubric:: Default values (when enabled)
+
+.. code-block:: yaml
+
+rules:
+  override-comments:
+    forbid: False
+
+"""
+from yamllint.linter import LintProblem
+
+
+ID = 'override-comments'
+TYPE = 'comment'
+CONF = {'forbid': bool}
+DEFAULT = {'forbid': False}
+
+
+def check(conf, comment):
+    """Check if comments are found.
+    """
+    if conf['forbid']:
+        yield LintProblem(comment.line_no, comment.column_no,
+                          'forbidden comment')

tests/plugins/yamllint_plugin_example/yamllint_plugin_example/random_failure.py

@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2020 Adrien Vergé
+#
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+
+
+import random
+
+from yamllint.linter import LintProblem
+
+
+ID = 'random-failure'
+TYPE = 'token'
+
+
+def check(conf, token, prev, next, nextnext, context):
+    if random.random() > 0.9:
+        yield LintProblem(token.start_mark.line + 1,
+                          token.start_mark.column + 1,
+                          'random failure')

tests/rules/test_braces.py

@@ -61,30 +61,6 @@ class ColonTestCase(RuleTestCase):
                    '  a: 1\n'
                    '}\n', conf, problem=(2, 8))
 
-        conf = ('braces:\n'
-                '  forbid: non-empty\n')
-        self.check('---\n'
-                   'dict:\n'
-                   '  a: 1\n', conf)
-        self.check('---\n'
-                   'dict: {}\n', conf)
-        self.check('---\n'
-                   'dict: {\n'
-                   '}\n', conf)
-        self.check('---\n'
-                   'dict: {\n'
-                   '# commented: value\n'
-                   '# another: value2\n'
-                   '}\n', conf)
-        self.check('---\n'
-                   'dict: {a}\n', conf, problem=(2, 8))
-        self.check('---\n'
-                   'dict: {a: 1}\n', conf, problem=(2, 8))
-        self.check('---\n'
-                   'dict: {\n'
-                   '  a: 1\n'
-                   '}\n', conf, problem=(2, 8))
-
     def test_min_spaces(self):
         conf = ('braces:\n'
                 '  max-spaces-inside: -1\n'

tests/rules/test_brackets.py

@@ -60,29 +60,6 @@ class ColonTestCase(RuleTestCase):
                    '  b\n'
                    ']\n', conf, problem=(2, 9))
 
-        conf = ('brackets:\n'
-                '  forbid: non-empty\n')
-        self.check('---\n'
-                   'array:\n'
-                   '  - a\n'
-                   '  - b\n', conf)
-        self.check('---\n'
-                   'array: []\n', conf)
-        self.check('---\n'
-                   'array: [\n\n'
-                   ']\n', conf)
-        self.check('---\n'
-                   'array: [\n'
-                   '# a comment\n'
-                   ']\n', conf)
-        self.check('---\n'
-                   'array: [a, b]\n', conf, problem=(2, 9))
-        self.check('---\n'
-                   'array: [\n'
-                   '  a,\n'
-                   '  b\n'
-                   ']\n', conf, problem=(2, 9))
-
     def test_min_spaces(self):
         conf = ('brackets:\n'
                 '  max-spaces-inside: -1\n'

tests/rules/test_line_length.py

@@ -14,6 +14,9 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import sys
+import unittest
+
 from tests.common import RuleTestCase
 
 
@@ -116,27 +119,6 @@ class LineLengthTestCase(RuleTestCase):
                    'long_line: http://localhost/very/very/long/url\n'
                    '...\n', conf, problem=(2, 21))
 
-        conf = 'line-length: {max: 20, allow-non-breakable-words: true}'
-        self.check('---\n'
-                   '# http://www.verylongurlurlurlurlurlurlurlurl.com\n'
-                   'key:\n'
-                   '  subkey: value\n', conf)
-        self.check('---\n'
-                   '## http://www.verylongurlurlurlurlurlurlurlurl.com\n'
-                   'key:\n'
-                   '  subkey: value\n', conf)
-        self.check('---\n'
-                   '# # http://www.verylongurlurlurlurlurlurlurlurl.com\n'
-                   'key:\n'
-                   '  subkey: value\n', conf,
-                   problem=(2, 21))
-        self.check('---\n'
-                   '#A http://www.verylongurlurlurlurlurlurlurlurl.com\n'
-                   'key:\n'
-                   '  subkey: value\n', conf,
-                   problem1=(2, 2, 'comments'),
-                   problem2=(2, 21, 'line-length'))
-
         conf = ('line-length: {max: 20, allow-non-breakable-words: true}\n'
                 'trailing-spaces: disable')
         self.check('---\n'
@@ -177,6 +159,7 @@ class LineLengthTestCase(RuleTestCase):
                    '  {% this line is' + 99 * ' really' + ' long %}\n',
                    conf, problem=(3, 81))
 
+    @unittest.skipIf(sys.version_info < (3, 0), 'Python 2 not supported')
     def test_unicode(self):
         conf = 'line-length: {max: 53}'
         self.check('---\n'

tests/rules/test_quoted_strings.py

@@ -436,21 +436,3 @@ class QuotedTestCase(RuleTestCase):
                    '- foo bar\n'
                    '- "foo bar"\n',
                    conf, problem1=(3, 3), problem2=(7, 3), problem3=(11, 3))
-
-    def test_octal_values(self):
-        conf = 'quoted-strings: {required: true}\n'
-
-        self.check('---\n'
-                   '- 100\n'
-                   '- 0100\n'
-                   '- 0o100\n'
-                   '- 777\n'
-                   '- 0777\n'
-                   '- 0o777\n'
-                   '- 800\n'
-                   '- 0800\n'
-                   '- 0o800\n'
-                   '- "0800"\n'
-                   '- "0o800"\n',
-                   conf,
-                   problem1=(9, 3), problem2=(10, 3))

tests/test_cli.py

@@ -14,7 +14,10 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from io import StringIO
+try:
+    from cStringIO import StringIO
+except ImportError:
+    from io import StringIO
 import fcntl
 import locale
 import os
@@ -243,19 +246,19 @@ class CommandLineTestCase(unittest.TestCase):
             cli.run(())
         self.assertNotEqual(ctx.returncode, 0)
         self.assertEqual(ctx.stdout, '')
-        self.assertRegex(ctx.stderr, r'^usage')
+        self.assertRegexpMatches(ctx.stderr, r'^usage')
 
         with RunContext(self) as ctx:
             cli.run(('--unknown-arg', ))
         self.assertNotEqual(ctx.returncode, 0)
         self.assertEqual(ctx.stdout, '')
-        self.assertRegex(ctx.stderr, r'^usage')
+        self.assertRegexpMatches(ctx.stderr, r'^usage')
 
         with RunContext(self) as ctx:
             cli.run(('-c', './conf.yaml', '-d', 'relaxed', 'file'))
         self.assertNotEqual(ctx.returncode, 0)
         self.assertEqual(ctx.stdout, '')
-        self.assertRegex(
+        self.assertRegexpMatches(
             ctx.stderr.splitlines()[-1],
             r'^yamllint: error: argument -d\/--config-data: '
             r'not allowed with argument -c\/--config-file$'
@@ -266,21 +269,21 @@ class CommandLineTestCase(unittest.TestCase):
             cli.run(('-', 'file'))
         self.assertNotEqual(ctx.returncode, 0)
         self.assertEqual(ctx.stdout, '')
-        self.assertRegex(ctx.stderr, r'^usage')
+        self.assertRegexpMatches(ctx.stderr, r'^usage')
 
     def test_run_with_bad_config(self):
         with RunContext(self) as ctx:
             cli.run(('-d', 'rules: {a: b}', 'file'))
         self.assertEqual(ctx.returncode, -1)
         self.assertEqual(ctx.stdout, '')
-        self.assertRegex(ctx.stderr, r'^invalid config: no such rule')
+        self.assertRegexpMatches(ctx.stderr, r'^invalid config: no such rule')
 
     def test_run_with_empty_config(self):
         with RunContext(self) as ctx:
             cli.run(('-d', '', 'file'))
         self.assertEqual(ctx.returncode, -1)
         self.assertEqual(ctx.stdout, '')
-        self.assertRegex(ctx.stderr, r'^invalid config: not a dict')
+        self.assertRegexpMatches(ctx.stderr, r'^invalid config: not a dict')
 
     def test_run_with_config_file(self):
         with open(os.path.join(self.wd, 'config'), 'w') as f:
@@ -297,7 +300,6 @@ class CommandLineTestCase(unittest.TestCase):
             cli.run(('-c', f.name, os.path.join(self.wd, 'a.yaml')))
         self.assertEqual(ctx.returncode, 1)
 
-    @unittest.skipIf(os.environ.get('GITHUB_RUN_ID'), '$HOME not overridable')
     def test_run_with_user_global_config_file(self):
         home = os.path.join(self.wd, 'fake-home')
         dir = os.path.join(home, '.config', 'yamllint')
@@ -384,7 +386,7 @@ class CommandLineTestCase(unittest.TestCase):
         with RunContext(self) as ctx:
             cli.run(('--version', ))
         self.assertEqual(ctx.returncode, 0)
-        self.assertRegex(ctx.stdout + ctx.stderr, r'yamllint \d+\.\d+')
+        self.assertRegexpMatches(ctx.stdout + ctx.stderr, r'yamllint \d+\.\d+')
 
     def test_run_non_existing_file(self):
         path = os.path.join(self.wd, 'i-do-not-exist.yaml')
@@ -393,7 +395,7 @@ class CommandLineTestCase(unittest.TestCase):
             cli.run(('-f', 'parsable', path))
         self.assertEqual(ctx.returncode, -1)
         self.assertEqual(ctx.stdout, '')
-        self.assertRegex(ctx.stderr, r'No such file or directory')
+        self.assertRegexpMatches(ctx.stderr, r'No such file or directory')
 
     def test_run_one_problem_file(self):
         path = os.path.join(self.wd, 'a.yaml')

tests/test_config.py

@@ -14,7 +14,10 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from io import StringIO
+try:
+    from cStringIO import StringIO
+except ImportError:
+    from io import StringIO
 import os
 import shutil
 import sys
@@ -45,7 +48,7 @@ class SimpleConfigTestCase(unittest.TestCase):
             config.YamlLintConfig('not: valid: yaml')
 
     def test_unknown_rule(self):
-        with self.assertRaisesRegex(
+        with self.assertRaisesRegexp(
                 config.YamlLintConfigError,
                 'invalid config: no such rule: "this-one-does-not-exist"'):
             config.YamlLintConfig('rules:\n'
@@ -64,7 +67,7 @@ class SimpleConfigTestCase(unittest.TestCase):
         self.assertEqual(c.rules['colons']['max-spaces-after'], 1)
 
     def test_unknown_option(self):
-        with self.assertRaisesRegex(
+        with self.assertRaisesRegexp(
                 config.YamlLintConfigError,
                 'invalid config: unknown option "abcdef" for rule "colons"'):
             config.YamlLintConfig('rules:\n'
@@ -102,7 +105,7 @@ class SimpleConfigTestCase(unittest.TestCase):
         self.assertEqual(c.rules['indentation']['check-multi-line-strings'],
                          False)
 
-        with self.assertRaisesRegex(
+        with self.assertRaisesRegexp(
                 config.YamlLintConfigError,
                 'invalid config: option "indent-sequences" of "indentation" '
                 'should be in '):

tests/test_module.py

@@ -47,15 +47,16 @@ class ModuleTestCase(unittest.TestCase):
             subprocess.check_output([PYTHON, '-m', 'yamllint'],
                                     stderr=subprocess.STDOUT)
         self.assertEqual(ctx.exception.returncode, 2)
-        self.assertRegex(ctx.exception.output.decode(), r'^usage: yamllint')
+        self.assertRegexpMatches(ctx.exception.output.decode(),
+                                 r'^usage: yamllint')
 
     def test_run_module_on_bad_dir(self):
         with self.assertRaises(subprocess.CalledProcessError) as ctx:
             subprocess.check_output([PYTHON, '-m', 'yamllint',
                                      '/does/not/exist'],
                                     stderr=subprocess.STDOUT)
-        self.assertRegex(ctx.exception.output.decode(),
-                         r'No such file or directory')
+        self.assertRegexpMatches(ctx.exception.output.decode(),
+                                 r'No such file or directory')
 
     def test_run_module_on_file(self):
         out = subprocess.check_output(

tests/test_plugins.py

@@ -0,0 +1,80 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2020 Satoru SATOH
+#
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+import unittest
+import warnings
+
+try:
+    from unittest import mock
+except ImportError:  # for python 2.7
+    mock = False
+
+from tests.plugins import example
+
+import yamllint.plugins
+
+
+class FakeEntryPoint(object):
+    """Fake object to mimic pkg_resources.EntryPoint.
+    """
+    RULES_MAP = example.RULES_MAP
+
+    def load(self):
+        """Fake method to return self.
+        """
+        return self
+
+
+class BrokenEntryPoint(FakeEntryPoint):
+    """Fake object to mimic load failure of pkg_resources.EntryPoint.
+    """
+    def load(self):
+        raise ImportError("This entry point should fail always!")
+
+
+class PluginFunctionsTestCase(unittest.TestCase):
+
+    def test_validate_rule_module(self):
+        fun = yamllint.plugins.validate_rule_module
+        rule_mod = example.override_comments
+
+        self.assertFalse(fun(object()))
+        self.assertTrue(fun(rule_mod))
+
+    @unittest.skipIf(not mock, "unittest.mock is not available")
+    def test_validate_rule_module_using_mock(self):
+        fun = yamllint.plugins.validate_rule_module
+        rule_mod = example.override_comments
+
+        with mock.patch.object(rule_mod, "ID", False):
+            self.assertFalse(fun(rule_mod))
+
+        with mock.patch.object(rule_mod, "TYPE", False):
+            self.assertFalse(fun(rule_mod))
+
+        with mock.patch.object(rule_mod, "check", True):
+            self.assertFalse(fun(rule_mod))
+
+    def test_load_plugin_rules_itr(self):
+        fun = yamllint.plugins.load_plugin_rules_itr
+
+        self.assertEqual(list(fun([])), [])
+        self.assertEqual(sorted(fun([FakeEntryPoint(),
+                                     FakeEntryPoint()])),
+                         sorted(FakeEntryPoint.RULES_MAP.items()))
+
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore")
+            self.assertEqual(list(fun([BrokenEntryPoint()])), [])

tests/test_rules.py

@@ -0,0 +1,64 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2020 Satoru SATOH
+#
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+import unittest
+
+try:
+    from unittest import mock
+except ImportError:  # for python 2.7
+    mock = False
+
+from tests.plugins import example
+
+import yamllint.rules
+
+
+RULE_NEVER_EXISTS = "rule_never_exists"
+PLUGIN_RULES = example.RULES_MAP
+
+
+class TestCase(unittest.TestCase):
+    """Test cases for yamllint.rules.__init__.*.
+    """
+    def test_get_default_rule(self):
+        self.assertEqual(yamllint.rules.get(yamllint.rules.braces.ID),
+                         yamllint.rules.braces)
+
+    def test_get_rule_does_not_exist(self):
+        with self.assertRaises(ValueError):
+            yamllint.rules.get(RULE_NEVER_EXISTS)
+
+
+@unittest.skipIf(not mock, "unittest.mock is not available")
+class TestCaseUsingMock(unittest.TestCase):
+    """Test cases for yamllint.rules.__init__.* using mock.
+    """
+    def test_get_default_rule_with_plugins(self):
+        with mock.patch.dict(yamllint.rules._EXTERNAL_RULES, PLUGIN_RULES):
+            self.assertEqual(yamllint.rules.get(yamllint.rules.braces.ID),
+                             yamllint.rules.braces)
+
+    def test_get_plugin_rules(self):
+        plugin_rule_id = example.override_comments.ID
+        plugin_rule_mod = example.override_comments
+
+        with mock.patch.dict(yamllint.rules._EXTERNAL_RULES, PLUGIN_RULES):
+            self.assertEqual(yamllint.rules.get(plugin_rule_id),
+                             plugin_rule_mod)
+
+    def test_get_rule_does_not_exist_with_plugins(self):
+        with mock.patch.dict(yamllint.rules._EXTERNAL_RULES, PLUGIN_RULES):
+            with self.assertRaises(ValueError):
+                yamllint.rules.get(RULE_NEVER_EXISTS)

yamllint/__init__.py

@@ -22,7 +22,7 @@ indentation, etc."""
 
 
 APP_NAME = 'yamllint'
-APP_VERSION = '1.26.3'
+APP_VERSION = '1.25.0'
 APP_DESCRIPTION = __doc__
 
 __author__ = u'Adrien Vergé'

yamllint/conf/default.yaml

@@ -29,5 +29,7 @@ rules:
   octal-values: disable
   quoted-strings: disable
   trailing-spaces: enable
+  random-failure: enable
+  override-comments: {forbid: true}
   truthy:
     level: warning

yamllint/linter.py

@@ -233,7 +233,7 @@ def run(input, conf, filepath=None):
     if conf.is_file_ignored(filepath):
         return ()
 
-    if isinstance(input, (bytes, str)):
+    if isinstance(input, (type(b''), type(u''))):  # compat with Python 2 & 3
         return _run(input, conf, filepath)
     elif hasattr(input, 'read'):  # Python 2's file or Python 3's io.IOBase
         # We need to have everything in memory to parse correctly

yamllint/plugins.py

@@ -0,0 +1,62 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2020 Satoru SATOH
+#
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+"""
+Plugin module utilizing setuptools (pkg_resources) to allow users to add their
+own custom lint rules.
+"""
+import warnings
+
+import pkg_resources
+
+
+PACKAGE_GROUP = "yamllint.plugins.rules"
+
+
+def validate_rule_module(rule_mod):
+    """Test if given rule module is valid.
+    """
+    return (getattr(rule_mod, "ID", False) and
+            getattr(rule_mod, "TYPE", False)
+            ) and callable(getattr(rule_mod, "check", False))
+
+
+def load_plugin_rules_itr(entry_points=None, group=PACKAGE_GROUP):
+    """Load custom lint rule plugins."""
+    if not entry_points:
+        entry_points = pkg_resources.iter_entry_points(group)
+
+    rule_ids = set()
+    for entry in entry_points:
+        try:
+            rules = entry.load()
+            for rule_id, rule_mod in rules.RULES_MAP.items():
+                if rule_id in rule_ids or not validate_rule_module(rule_mod):
+                    continue
+
+                print(rule_id, rule_mod)###
+                yield (rule_id, rule_mod)
+                rule_ids.add(rule_id)
+
+        # pkg_resources.EntryPoint.resolve may throw ImportError.
+        except (AttributeError, ImportError):
+            warnings.warn("Could not load the plugin: {}".format(entry),
+                          RuntimeWarning)
+
+
+def get_plugin_rules_map():
+    """Get a mappings of plugin rule's IDs and rules."""
+    return dict((rule_id, rule_mod)
+                for rule_id, rule_mod in load_plugin_rules_itr())

yamllint/rules/__init__.py

@@ -14,6 +14,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import yamllint.plugins
 from yamllint.rules import (
     braces,
     brackets,
@@ -62,9 +63,14 @@ _RULES = {
     truthy.ID: truthy,
 }
 
+_EXTERNAL_RULES = yamllint.plugins.get_plugin_rules_map()
 
-def get(id):
-    if id not in _RULES:
-        raise ValueError('no such rule: "%s"' % id)
 
-    return _RULES[id]
+def get(rule_id):
+    if rule_id in _RULES:
+        return _RULES[rule_id]
+
+    if rule_id in _EXTERNAL_RULES:
+        return _EXTERNAL_RULES[rule_id]
+
+    raise ValueError('no such rule: "%s"' % rule_id)

yamllint/rules/braces.py

@@ -22,8 +22,7 @@ braces (``{`` and ``}``).
 
 * ``forbid`` is used to forbid the use of flow mappings which are denoted by
   surrounding braces (``{`` and ``}``). Use ``true`` to forbid the use of flow
-  mappings completely. Use ``non-empty`` to forbid the use of all flow
-  mappings except for empty ones.
+  mappings completely.
 * ``min-spaces-inside`` defines the minimal number of spaces required inside
   braces.
 * ``max-spaces-inside`` defines the maximal number of spaces allowed inside
@@ -61,18 +60,6 @@ braces (``{`` and ``}``).
 
     object: { key1: 4, key2: 8 }
 
-#. With ``braces: {forbid: non-empty}``
-
-   the following code snippet would **PASS**:
-   ::
-
-    object: {}
-
-   the following code snippet would **FAIL**:
-   ::
-
-    object: { key1: 4, key2: 8 }
-
 #. With ``braces: {min-spaces-inside: 0, max-spaces-inside: 0}``
 
    the following code snippet would **PASS**:
@@ -141,7 +128,7 @@ from yamllint.rules.common import spaces_after, spaces_before
 
 ID = 'braces'
 TYPE = 'token'
-CONF = {'forbid': (bool, 'non-empty'),
+CONF = {'forbid': bool,
         'min-spaces-inside': int,
         'max-spaces-inside': int,
         'min-spaces-inside-empty': int,
@@ -154,15 +141,7 @@ DEFAULT = {'forbid': False,
 
 
 def check(conf, token, prev, next, nextnext, context):
-    if (conf['forbid'] is True and
-            isinstance(token, yaml.FlowMappingStartToken)):
-        yield LintProblem(token.start_mark.line + 1,
-                          token.end_mark.column + 1,
-                          'forbidden flow mapping')
-
-    elif (conf['forbid'] == 'non-empty' and
-            isinstance(token, yaml.FlowMappingStartToken) and
-            not isinstance(next, yaml.FlowMappingEndToken)):
+    if conf['forbid'] and isinstance(token, yaml.FlowMappingStartToken):
         yield LintProblem(token.start_mark.line + 1,
                           token.end_mark.column + 1,
                           'forbidden flow mapping')

yamllint/rules/brackets.py

@@ -22,8 +22,7 @@ inside brackets (``[`` and ``]``).
 
 * ``forbid`` is used to forbid the use of flow sequences which are denoted by
   surrounding brackets (``[`` and ``]``). Use ``true`` to forbid the use of
-  flow sequences completely. Use ``non-empty`` to forbid the use of all flow
-  sequences except for empty ones.
+  flow sequences completely.
 * ``min-spaces-inside`` defines the minimal number of spaces required inside
   brackets.
 * ``max-spaces-inside`` defines the maximal number of spaces allowed inside
@@ -62,18 +61,6 @@ inside brackets (``[`` and ``]``).
 
     object: [ 1, 2, abc ]
 
-#. With ``brackets: {forbid: non-empty}``
-
-   the following code snippet would **PASS**:
-   ::
-
-    object: []
-
-   the following code snippet would **FAIL**:
-   ::
-
-    object: [ 1, 2, abc ]
-
 #. With ``brackets: {min-spaces-inside: 0, max-spaces-inside: 0}``
 
    the following code snippet would **PASS**:
@@ -142,7 +129,7 @@ from yamllint.rules.common import spaces_after, spaces_before
 
 ID = 'brackets'
 TYPE = 'token'
-CONF = {'forbid': (bool, 'non-empty'),
+CONF = {'forbid': bool,
         'min-spaces-inside': int,
         'max-spaces-inside': int,
         'min-spaces-inside-empty': int,
@@ -155,15 +142,7 @@ DEFAULT = {'forbid': False,
 
 
 def check(conf, token, prev, next, nextnext, context):
-    if (conf['forbid'] is True and
-            isinstance(token, yaml.FlowSequenceStartToken)):
-        yield LintProblem(token.start_mark.line + 1,
-                          token.end_mark.column + 1,
-                          'forbidden flow sequence')
-
-    elif (conf['forbid'] == 'non-empty' and
-            isinstance(token, yaml.FlowSequenceStartToken) and
-            not isinstance(next, yaml.FlowSequenceEndToken)):
+    if conf['forbid'] and isinstance(token, yaml.FlowSequenceStartToken):
         yield LintProblem(token.start_mark.line + 1,
                           token.end_mark.column + 1,
                           'forbidden flow sequence')

yamllint/rules/line_length.py

@@ -17,6 +17,10 @@
 """
 Use this rule to set a limit to lines length.
 
+Note: with Python 2, the ``line-length`` rule may not work properly with
+unicode characters because of the way strings are represented in bytes. We
+recommend running yamllint with Python 3.
+
 .. rubric:: Options
 
 * ``max`` defines the maximal (inclusive) length of lines.
@@ -140,11 +144,7 @@ def check(conf, line):
                 start += 1
 
             if start != line.end:
-                if line.buffer[start] == '#':
-                    while line.buffer[start] == '#':
-                        start += 1
-                    start += 1
-                elif line.buffer[start] == '-':
+                if line.buffer[start] in ('#', '-'):
                     start += 2
 
                 if line.buffer.find(' ', start, line.end) == -1:

yamllint/rules/quoted_strings.py

@@ -144,17 +144,6 @@ def VALIDATE(conf):
 
 DEFAULT_SCALAR_TAG = u'tag:yaml.org,2002:str'
 
-# https://stackoverflow.com/a/36514274
-yaml.resolver.Resolver.add_implicit_resolver(
-    'tag:yaml.org,2002:int',
-    re.compile(r'''^(?:[-+]?0b[0-1_]+
-               |[-+]?0o?[0-7_]+
-               |[-+]?0[0-7_]+
-               |[-+]?(?:0|[1-9][0-9_]*)
-               |[-+]?0x[0-9a-fA-F_]+
-               |[-+]?[1-9][0-9_]*(?::[0-5]?[0-9])+)$''', re.X),
-    list('-+0123456789'))
-
 
 def _quote_match(quote_type, token_style):
     return ((quote_type == 'any') or