"""Pymode utils."""
import os.path
import sys
import threading
import warnings
from contextlib import contextmanager
from io import StringIO

import vim # noqa


DEBUG = int(vim.eval('g:pymode_debug'))

warnings.filterwarnings('ignore')


@contextmanager
def silence_stderr():
 """Redirect stderr."""
 if DEBUG:
 yield

 else:
 with threading.Lock():
 stderr = sys.stderr
 sys.stderr = StringIO()

 yield

 with threading.Lock():
 sys.stderr = stderr


def patch_paths():
 """Patch python sys.path.

 Load required modules from the plugin's sources.
 """
 dir_script = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.join(dir_script, 'libs'))
 if sys.platform == 'win32' or sys.platform == 'msys':
 dir_submodule = os.path.abspath(os.path.join(dir_script,
 '..', 'submodules'))
 sub_modules = os.listdir(dir_submodule)
 for module in sub_modules:
 module_full_path = os.path.join(dir_submodule, module)
 if module_full_path not in sys.path:
 sys.path.insert(0, module_full_path)