Enable pylint (#202)

pyls/__main__.py

@@ -80,12 +80,14 @@ def _binary_stdio():
     PY3K = sys.version_info >= (3, 0)
 
     if PY3K:
+        # pylint: disable=no-member
         stdin, stdout = sys.stdin.buffer, sys.stdout.buffer
     else:
         # Python 2 on Windows opens sys.stdin in text mode, and
         # binary data that read from it becomes corrupted on \r\n
         if sys.platform == "win32":
             # set sys.stdin to binary mode
+            # pylint: disable=no-member,import-error
             import os
             import msvcrt
             msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)

pyls/_utils.py

@@ -65,7 +65,7 @@ def find_parents(root, path, names):
 
 
 def list_to_string(value):
-    return ",".join(value) if type(value) == list else value
+    return ",".join(value) if isinstance(value, list) else value
 
 
 def merge_dicts(dict_a, dict_b):
@@ -122,7 +122,7 @@ def format_docstring(contents):
     Until we can find a fast enough way of discovering and parsing each format,
     we can do a little better by at least preserving indentation.
     """
-    contents = contents.replace('\t', '\u00A0' * 4)
-    contents = contents.replace('  ', '\u00A0' * 2)
+    contents = contents.replace('\t', u'\u00A0' * 4)
+    contents = contents.replace('  ', u'\u00A0' * 2)
     contents = contents.replace('*', '\\*')
     return contents

pyls/_version.py

@@ -1,4 +1,4 @@
-
+# pylint: skip-file
 # This file helps to compute a version number in source trees obtained from
 # git-archive tarball (such as those provided by githubs download-from-tag
 # feature). Distribution tarballs (built by setup.py sdist) and build

pyls/config/flake8_conf.py

@@ -1,8 +1,8 @@
 # Copyright 2017 Palantir Technologies, Inc.
 import logging
 import os
-from .source import ConfigSource
 from pyls._utils import find_parents
+from .source import ConfigSource
 
 log = logging.getLogger(__name__)
 
@@ -33,8 +33,7 @@ def user_config(self):
     def _user_config_file(self):
         if self.is_windows:
             return os.path.expanduser('~\\.flake8')
-        else:
-            return os.path.join(self.xdg_home, 'flake8')
+        return os.path.join(self.xdg_home, 'flake8')
 
     def project_config(self, document_path):
         files = find_parents(self.root_path, document_path, PROJECT_CONFIGS)

pyls/config/pycodestyle_conf.py

@@ -1,7 +1,7 @@
 # Copyright 2017 Palantir Technologies, Inc.
 import pycodestyle
-from .source import ConfigSource
 from pyls._utils import find_parents
+from .source import ConfigSource
 
 
 CONFIG_KEY = 'pycodestyle'

pyls/language_server.py

@@ -15,6 +15,7 @@ class _StreamHandlerWrapper(socketserver.StreamRequestHandler, object):
 
     def setup(self):
         super(_StreamHandlerWrapper, self).setup()
+        # pylint: disable=no-member
         self.delegate = self.DELEGATE_CLASS(self.rfile, self.wfile)
 
     def handle(self):
@@ -62,7 +63,7 @@ def __getitem__(self, item):
         def wrapped(*args, **kwargs):
             try:
                 return func(*args, **kwargs)
-            except:  # pylint: disable=bare-except
+            except:
                 log.exception("CAUGHT")
                 raise
         return wrapped
@@ -77,7 +78,7 @@ class LanguageServer(MethodJSONRPCServer):
     root_uri = None
     init_opts = None
 
-    def capabilities(self):
+    def capabilities(self):  # pylint: disable=no-self-use
         return {}
 
     def initialize(self, root_uri, init_opts, process_id):

pyls/plugins/format.py

@@ -14,7 +14,7 @@ def pyls_format_document(document):
 
 
 @hookimpl
-def pyls_format_range(document, range):
+def pyls_format_range(document, range):  # pylint: disable=redefined-builtin
     # First we 'round' the range up/down to full lines only
     range['start']['character'] = 0
     range['end']['line'] += 1
@@ -32,25 +32,25 @@ def pyls_format_range(document, range):
 
 
 def _format(document, lines=None):
-        new_source, changed = FormatCode(
-            document.source,
-            lines=lines,
-            filename=document.filename,
-            style_config=file_resources.GetDefaultStyleForDir(
-                os.path.dirname(document.filename)
-            )
+    new_source, changed = FormatCode(
+        document.source,
+        lines=lines,
+        filename=document.filename,
+        style_config=file_resources.GetDefaultStyleForDir(
+            os.path.dirname(document.filename)
         )
-
-        if not changed:
-            return []
-
-        # I'm too lazy at the moment to parse diffs into TextEdit items
-        # So let's just return the entire file...
-        return [{
-            'range': {
-                'start': {'line': 0, 'character': 0},
-                # End char 0 of the line after our document
-                'end': {'line': len(document.lines), 'character': 0}
-            },
-            'newText': new_source
-        }]
+    )
+
+    if not changed:
+        return []
+
+    # I'm too lazy at the moment to parse diffs into TextEdit items
+    # So let's just return the entire file...
+    return [{
+        'range': {
+            'start': {'line': 0, 'character': 0},
+            # End char 0 of the line after our document
+            'end': {'line': len(document.lines), 'character': 0}
+        },
+        'newText': new_source
+    }]

pyls/plugins/hover.py

@@ -13,7 +13,7 @@ def pyls_hover(document, position):
     # Find an exact match for a completion
     definitions = [d for d in definitions if d.name == word]
 
-    if len(definitions) == 0:
+    if not definitions:
         # :(
         return {'contents': ''}
 

pyls/plugins/pycodestyle_lint.py

@@ -36,23 +36,24 @@ def __init__(self, options=None):
         self.diagnostics = []
         super(PyCodeStyleDiagnosticReport, self).__init__(options=options)
 
-    def error(self, lineno, offset, text, check):
+    def error(self, line_number, offset, text, check):
         # PyCodeStyle will sometimes give you an error the line after the end of the file
         #   e.g. no newline at end of file
         # In that case, the end offset should just be some number ~100
         # (because why not? There's nothing to underline anyways)
-        range = {
-            'start': {'line': lineno - 1, 'character': offset},
+        err_range = {
+            'start': {'line': line_number - 1, 'character': offset},
             'end': {
                 # FIXME: It's a little naiive to mark until the end of the line, can we not easily do better?
-                'line': lineno - 1, 'character': 100 if lineno > len(self.lines) else len(self.lines[lineno - 1])
+                'line': line_number - 1,
+                'character': 100 if line_number > len(self.lines) else len(self.lines[line_number - 1])
             },
         }
         code, _message = text.split(" ", 1)
 
         self.diagnostics.append({
             'source': 'pycodestyle',
-            'range': range,
+            'range': err_range,
             'message': text,
             'code': code,
             # Are style errors really ever errors?

pyls/plugins/pyflakes_lint.py

@@ -19,27 +19,27 @@ def __init__(self, lines):
     def unexpectedError(self, filename, msg):  # pragma: no cover
         pass
 
-    def syntaxError(self, filename, msg, lineno, offset, text):
-        range = {
+    def syntaxError(self, _filename, msg, lineno, offset, text):
+        err_range = {
             'start': {'line': lineno - 1, 'character': offset},
             'end': {'line': lineno - 1, 'character': offset + len(text)},
         }
         self.diagnostics.append({
             'source': 'pyflakes',
-            'range': range,
+            'range': err_range,
             'message': msg,
             'severity': lsp.DiagnosticSeverity.Error,
         })
 
     def flake(self, message):
         """ Get message like <filename>:<lineno>: <msg> """
-        range = {
+        err_range = {
             'start': {'line': message.lineno - 1, 'character': message.col},
             'end': {'line': message.lineno - 1, 'character': len(self.lines[message.lineno - 1])},
         }
         self.diagnostics.append({
             'source': 'pyflakes',
-            'range': range,
+            'range': err_range,
             'message': message.message % message.message_args,
             'severity': lsp.DiagnosticSeverity.Warning
         })

pyls/plugins/signature.py

@@ -5,9 +5,9 @@
 
 log = logging.getLogger(__name__)
 
-SPHINX = re.compile("\s*:param\s+(?P<param>\w+):\s*(?P<doc>[^\\n]+)")
-EPYDOC = re.compile("\s*@param\s+(?P<param>\w+):\s*(?P<doc>[^\\n]+)")
-GOOGLE = re.compile("\s*(?P<param>\w+).*:\s*(?P<doc>[^\\n]+)")
+SPHINX = re.compile(r"\s*:param\s+(?P<param>\w+):\s*(?P<doc>[^\n]+)")
+EPYDOC = re.compile(r"\s*@param\s+(?P<param>\w+):\s*(?P<doc>[^\n]+)")
+GOOGLE = re.compile(r"\s*(?P<param>\w+).*:\s*(?P<doc>[^\n]+)")
 
 DOC_REGEX = [SPHINX, EPYDOC, GOOGLE]
 
@@ -16,7 +16,7 @@
 def pyls_signature_help(document, position):
     signatures = document.jedi_script(position).call_signatures()
 
-    if len(signatures) == 0:
+    if not signatures:
         return {'signatures': []}
 
     s = signatures[0]
@@ -26,7 +26,7 @@ def pyls_signature_help(document, position):
     }
 
     # If there are params, add those
-    if len(s.params) > 0:
+    if s.params:
         sig['parameters'] = [{
             'label': p.name,
             'documentation': _param_docs(s.docstring(), p.name)

pyls/plugins/symbols.py

@@ -39,7 +39,7 @@ def _container(definition):
         # as children of the module.
         if parent.parent():
             return parent.name
-    except:
+    except:  # pylint: disable=bare-except
         pass
 
 

pyls/python_ls.py

@@ -13,6 +13,7 @@
 
 
 class PythonLanguageServer(LanguageServer):
+    # pylint: disable=too-many-public-methods,redefined-builtin
 
     workspace = None
     config = None
@@ -148,14 +149,14 @@ def m_text_document__hover(self, textDocument=None, position=None, **_kwargs):
     def m_text_document__document_symbol(self, textDocument=None, **_kwargs):
         return self.document_symbols(textDocument['uri'])
 
-    def m_text_document__formatting(self, textDocument=None, options=None, **_kwargs):
+    def m_text_document__formatting(self, textDocument=None, _options=None, **_kwargs):
         # For now we're ignoring formatting options.
         return self.format_document(textDocument['uri'])
 
     def m_text_document__rename(self, textDocument=None, position=None, newName=None, **_kwargs):
         return self.rename(textDocument['uri'], position, newName)
 
-    def m_text_document__range_formatting(self, textDocument=None, range=None, options=None, **_kwargs):
+    def m_text_document__range_formatting(self, textDocument=None, range=None, _options=None, **_kwargs):
         # Again, we'll ignore formatting options for now.
         return self.format_range(textDocument['uri'], range)
 

pyls/server.py

@@ -56,7 +56,7 @@ def handle(self):
                         on_result(msg['result'])
                     elif 'error' in msg and on_error:
                         on_error(msg['error'])
-            except Exception:
+            except:  # pylint: disable=bare-except
                 log.exception("Language server exiting due to uncaught exception")
                 break
 

pyls/workspace.py

@@ -22,19 +22,19 @@
 
 def get_submodules(mod):
     """Get all submodules of a given module"""
-    def catch_exceptions(module):
+    def catch_exceptions(_module):
         pass
+
     try:
         m = __import__(mod)
         submodules = [mod]
-        submods = pkgutil.walk_packages(m.__path__, m.__name__ + '.',
-                                        catch_exceptions)
+        submods = pkgutil.walk_packages(m.__path__, m.__name__ + '.', catch_exceptions)
         for sm in submods:
             sm_name = sm[1]
             submodules.append(sm_name)
     except ImportError:
         return []
-    except Exception:
+    except:  # pylint: disable=bare-except
         return [mod]
     return submodules
 

tox.ini

@@ -23,8 +23,10 @@ deps =
     pytest
     coverage
     pytest-cov
+    pylint
 
 [testenv:lint]
 commands =
+    pylint pyls
     pycodestyle pyls
     pyflakes pyls