Add support for pylint config files

pyls/config/config.py

@@ -13,7 +13,7 @@
 log = logging.getLogger(__name__)
 
 # Sources of config, first source overrides next source
-DEFAULT_CONFIG_SOURCES = ['pycodestyle']
+DEFAULT_CONFIG_SOURCES = ['pycodestyle', 'pylint']
 
 
 class Config(object):
@@ -39,6 +39,11 @@ def __init__(self, root_uri, init_opts, process_id, capabilities):
             self._config_sources['pycodestyle'] = PyCodeStyleConfig(self._root_path)
         except ImportError:
             pass
+        try:
+            from .pylint_conf import PylintConfig
+            self._config_sources['pylint'] = PylintConfig(self._root_path)
+        except ImportError:
+            pass
 
         self._pm = pluggy.PluginManager(PYLS)
         self._pm.trace.root.setwriter(log.debug)

pyls/config/pylint_conf.py

@@ -0,0 +1,53 @@
+# Copyright 2019 Palantir Technologies, Inc.
+import logging
+import os
+from pyls._utils import find_parents
+from .source import ConfigSource, _get_opt, _set_opt
+
+log = logging.getLogger(__name__)
+
+PROJECT_CONFIGS = ['.pylintrc', 'pylintrc']
+
+CONFIG_KEYS = {  # 'option': 'section key'
+    'disable': 'MESSAGES CONTROL',
+    'ignore': 'MASTER',
+    'max-line-length': 'FORMAT',
+}
+
+OPTIONS = [
+    ('disable', 'plugins.pylint.disable', list),
+    ('ignore', 'plugins.pylint.ignore', list),
+    ('max-line-length', 'plugins.pylint.maxLineLength', int),
+]
+
+
+class PylintConfig(ConfigSource):
+    """Parse pylint configurations."""
+
+    def user_config(self):
+        config_file = self._user_config_file()
+        config = self.read_config_from_files([config_file])
+        return self.parse_config_multi_keys(config, CONFIG_KEYS, OPTIONS)
+
+    def _user_config_file(self):
+        if self.is_windows:
+            return os.path.expanduser('~\\.pylintrc')
+        return os.path.expanduser('~/.pylintrc')
+
+    def project_config(self, document_path):
+        files = find_parents(self.root_path, document_path, PROJECT_CONFIGS)
+        config = self.read_config_from_files(files)
+        return self.parse_config_multi_keys(config, CONFIG_KEYS, OPTIONS)
+
+    @staticmethod
+    def parse_config_multi_keys(config, keys, options):
+        """Parse the config with the given options.
+        This method use multiple keys depending on the value we want to get.
+        """
+        conf = {}
+        for source, destination, opt_type in options:
+            key = keys[source]
+            opt_value = _get_opt(config, key, source, opt_type)
+            if opt_value is not None:
+                _set_opt(conf, destination, opt_value)
+        return conf

pyls/plugins/pylint_lint.py

@@ -11,6 +11,12 @@
 
 log = logging.getLogger(__name__)
 
+ARGS = {  # 'argument_name': 'name_under_plugin_conf'
+    'disable': 'disable',
+    'ignore': 'ignore',
+    'max-line-length': 'maxLineLength',
+}
+
 
 class PylintLinter(object):
     last_diags = collections.defaultdict(list)
@@ -140,10 +146,24 @@ def lint(cls, document, is_saved, flags=''):
 
 
 def _build_pylint_flags(settings):
-    """Build arguments for calling pylint."""
+    """Build arguments for calling pylint.
+    If args is found then it's the arguments used, otherwise,
+    we build arguments from the plugin config.
+    """
     pylint_args = settings.get('args')
     if pylint_args is None:
-        return ''
+        # Build args from plugin config
+        pylint_args = list()
+        for arg_name in ARGS:
+            arg_val = settings.get(ARGS[arg_name])
+            arg = None
+            if isinstance(arg_val, list):
+                arg = '--{}={}'.format(arg_name, ','.join(arg_val))
+            elif isinstance(arg_val, int):
+                arg = '--{}={}'.format(arg_name, arg_val)
+            if arg:
+                pylint_args.append(arg)
+
     return ' '.join(pylint_args)
 
 

vscode-client/package.json

@@ -27,7 +27,7 @@
                 },
                 "pyls.configurationSources": {
                     "type": "array",
-                    "default": ["pycodestyle"],
+                    "default": ["pycodestyle", "pylint"],
                     "description": "List of configuration sources to use.",
                     "items": {
                         "type": "string",