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# encoding: utf-8

"""

Utilities for working with external processes.

"""

# Copyright (c) IPython Development Team.

# Distributed under the terms of the Modified BSD License.

import os

import shutil

import sys

if sys.platform == 'win32':

from ._process_win32 import system, getoutput, arg_split, check_pid

elif sys.platform == 'cli':

from ._process_cli import system, getoutput, arg_split, check_pid

elif sys.platform == "emscripten":

from ._process_emscripten import system, getoutput, arg_split, check_pid

else:

from ._process_posix import system, getoutput, arg_split, check_pid

from ._process_common import getoutputerror, get_output_error_code, process_handler

class FindCmdError(Exception):

pass

def find_cmd(cmd):

"""Find absolute path to executable cmd in a cross platform manner.

This function tries to determine the full path to a command line program

using `which` on Unix/Linux/OS X and `win32api` on Windows. Most of the

time it will use the version that is first on the users `PATH`.

Warning, don't use this to find IPython command line programs as there

is a risk you will find the wrong one. Instead find those using the

following code and looking for the application itself::

import sys

argv = [sys.executable, '-m', 'IPython']

Parameters

----------

cmd : str

The command line program to look for.

"""

path = shutil.which(cmd)

if path is None:

raise FindCmdError('command could not be found: %s' % cmd)

return path

def abbrev_cwd():

""" Return abbreviated version of cwd, e.g. d:mydir """

cwd = os.getcwd().replace('\\','/')

drivepart = ''

tail = cwd

if sys.platform == 'win32':

if len(cwd) < 4:

return cwd

drivepart,tail = os.path.splitdrive(cwd)

parts = tail.split('/')

if len(parts) > 2:

tail = '/'.join(parts[-2:])

return (drivepart + (

cwd == '/' and '/' or tail))