Adding new stuff

vim-plugins/bundle/python-mode/pymode/libs/pylint/epylint.py

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+# -*- coding: utf-8; mode: python; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4
+# -*- vim:fenc=utf-8:ft=python:et:sw=4:ts=4:sts=4
+# Copyright (c) 2003-2013 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.
+"""Emacs and Flymake compatible Pylint.
+
+This script is for integration with emacs and is compatible with flymake mode.
+
+epylint walks out of python packages before invoking pylint. This avoids
+reporting import errors that occur when a module within a package uses the
+absolute import path to get another module within this package.
+
+For example:
+    - Suppose a package is structured as
+
+        a/__init__.py
+        a/b/x.py
+        a/c/y.py
+
+   - Then if y.py imports x as "from a.b import x" the following produces pylint
+     errors
+
+       cd a/c; pylint y.py
+
+   - The following obviously doesn't
+
+       pylint a/c/y.py
+
+   - As this script will be invoked by emacs within the directory of the file
+     we are checking we need to go out of it to avoid these false positives.
+
+
+You may also use py_run to run pylint with desired options and get back (or not)
+its output.
+"""
+from __future__ import print_function
+
+import sys, os
+import os.path as osp
+from subprocess import Popen, PIPE
+
+def _get_env():
+    '''Extracts the environment PYTHONPATH and appends the current sys.path to
+    those.'''
+    env = dict(os.environ)
+    env['PYTHONPATH'] = os.pathsep.join(sys.path)
+    return env
+
+def lint(filename, options=None):
+    """Pylint the given file.
+
+    When run from emacs we will be in the directory of a file, and passed its
+    filename.  If this file is part of a package and is trying to import other
+    modules from within its own package or another package rooted in a directory
+    below it, pylint will classify it as a failed import.
+
+    To get around this, we traverse down the directory tree to find the root of
+    the package this module is in.  We then invoke pylint from this directory.
+
+    Finally, we must correct the filenames in the output generated by pylint so
+    Emacs doesn't become confused (it will expect just the original filename,
+    while pylint may extend it with extra directories if we've traversed down
+    the tree)
+    """
+    # traverse downwards until we are out of a python package
+    full_path = osp.abspath(filename)
+    parent_path = osp.dirname(full_path)
+    child_path = osp.basename(full_path)
+
+    while parent_path != "/" and osp.exists(osp.join(parent_path, '__init__.py')):
+        child_path = osp.join(osp.basename(parent_path), child_path)
+        parent_path = osp.dirname(parent_path)
+
+    # Start pylint
+    # Ensure we use the python and pylint associated with the running epylint
+    from pylint import lint as lint_mod
+    lint_path = lint_mod.__file__
+    options = options or ['--disable=C,R,I']
+    cmd = [sys.executable, lint_path] + options + [
+        '--msg-template', '{path}:{line}: {category} ({msg_id}, {symbol}, {obj}) {msg}',
+        '-r', 'n', child_path]
+    process = Popen(cmd, stdout=PIPE, cwd=parent_path, env=_get_env(),
+                    universal_newlines=True)
+
+    for line in process.stdout:
+        # remove pylintrc warning
+        if line.startswith("No config file found"):
+            continue
+
+        # modify the file name thats output to reverse the path traversal we made
+        parts = line.split(":")
+        if parts and parts[0] == child_path:
+            line = ":".join([filename] + parts[1:])
+        print(line, end=' ')
+
+    process.wait()
+    return process.returncode
+
+
+def py_run(command_options='', return_std=False, stdout=None, stderr=None,
+           script='epylint'):
+    """Run pylint from python
+
+    ``command_options`` is a string containing ``pylint`` command line options;
+    ``return_std`` (boolean) indicates return of created standard output
+    and error (see below);
+    ``stdout`` and ``stderr`` are 'file-like' objects in which standard output
+    could be written.
+
+    Calling agent is responsible for stdout/err management (creation, close).
+    Default standard output and error are those from sys,
+    or standalone ones (``subprocess.PIPE``) are used
+    if they are not set and ``return_std``.
+
+    If ``return_std`` is set to ``True``, this function returns a 2-uple
+    containing standard output and error related to created process,
+    as follows: ``(stdout, stderr)``.
+
+    A trivial usage could be as follows:
+        >>> py_run( '--version')
+        No config file found, using default configuration
+        pylint 0.18.1,
+            ...
+
+    To silently run Pylint on a module, and get its standard output and error:
+        >>> (pylint_stdout, pylint_stderr) = py_run( 'module_name.py', True)
+    """
+    # Create command line to call pylint
+    if os.name == 'nt':
+        script += '.bat'
+    command_line = script + ' ' + command_options
+    # Providing standard output and/or error if not set
+    if stdout is None:
+        if return_std:
+            stdout = PIPE
+        else:
+            stdout = sys.stdout
+    if stderr is None:
+        if return_std:
+            stderr = PIPE
+        else:
+            stderr = sys.stderr
+    # Call pylint in a subprocess
+    p = Popen(command_line, shell=True, stdout=stdout, stderr=stderr,
+              env=_get_env(), universal_newlines=True)
+    p.wait()
+    # Return standard output and error
+    if return_std:
+        return (p.stdout, p.stderr)
+
+
+def Run():
+    if len(sys.argv) == 1:
+        print("Usage: %s <filename> [options]" % sys.argv[0])
+        sys.exit(1)
+    elif not osp.exists(sys.argv[1]):
+        print("%s does not exist" % sys.argv[1])
+        sys.exit(1)
+    else:
+        sys.exit(lint(sys.argv[1], sys.argv[2:]))
+
+
+if __name__ == '__main__':
+    Run()