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# encoding: utf-8
"""
Utilities for working with external processes.
"""
#-----------------------------------------------------------------------------
# Copyright (C) 2008-2011 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
from __future__ import print_function
# Stdlib
import os
import sys
import shlex
# Our own
if sys.platform == 'win32':
from ._process_win32 import _find_cmd, system, getoutput, AvoidUNCPath, arg_split
else:
from ._process_posix import _find_cmd, system, getoutput, arg_split
from ._process_common import getoutputerror
from IPython.utils import py3compat
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
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`. If
cmd is `python` return `sys.executable`.
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::
from IPython.utils.path import get_ipython_module_path
from IPython.utils.process import pycmd2argv
argv = pycmd2argv(get_ipython_module_path('IPython.frontend.terminal.ipapp'))
Parameters
----------
cmd : str
The command line program to look for.
"""
if cmd == 'python':
return os.path.abspath(sys.executable)
try:
path = _find_cmd(cmd).rstrip()
except OSError:
raise FindCmdError('command could not be found: %s' % cmd)
# which returns empty if not found
if path == '':
raise FindCmdError('command could not be found: %s' % cmd)
return os.path.abspath(path)
def pycmd2argv(cmd):
r"""Take the path of a python command and return a list (argv-style).
This only works on Python based command line programs and will find the
location of the ``python`` executable using ``sys.executable`` to make
sure the right version is used.
For a given path ``cmd``, this returns [cmd] if cmd's extension is .exe,
.com or .bat, and [, cmd] otherwise.
Parameters
----------
cmd : string
The path of the command.
Returns
-------
argv-style list.
"""
ext = os.path.splitext(cmd)[1]
if ext in ['.exe', '.com', '.bat']:
return [cmd]
else:
if sys.platform == 'win32':
# The -u option here turns on unbuffered output, which is required
# on Win32 to prevent wierd conflict and problems with Twisted.
# Also, use sys.executable to make sure we are picking up the
# right python exe.
return [sys.executable, '-u', cmd]
else:
return [sys.executable, cmd]
def abbrev_cwd():
""" Return abbreviated version of cwd, e.g. d:mydir """
cwd = os.getcwdu().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))
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