Application: gvSIG desktop » gvSIG scripting

# -*- 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

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# 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.

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# This program is distributed in the hope that it will be useful, but WITHOUT

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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details

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# 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 os

import os.path as osp

import sys

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

    process = Popen(command_line, shell=True, stdout=stdout, stderr=stderr,

                    env=_get_env(), universal_newlines=True)

    process.wait()

    # Return standard output and error

    if return_std:

        return (process.stdout, process.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()