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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.
from __future__ import print_function
import os
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
else:
from ._process_posix import system, getoutput, arg_split, check_pid
from ._process_common import getoutputerror, get_output_error_code, process_handler
from . import py3compat
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::
from IPython.utils.path import get_ipython_module_path
from IPython.utils.process import pycmd2argv
argv = pycmd2argv(get_ipython_module_path('IPython.terminal.ipapp'))
Parameters
----------
cmd : str
The command line program to look for.
"""
path = py3compat.which(cmd)
if path is None:
raise FindCmdError('command could not be found: %s' % cmd)
return path
def is_cmd_found(cmd):
"""Check whether executable `cmd` exists or not and return a bool."""
try:
find_cmd(cmd)
return True
except FindCmdError:
return False
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:
return [sys.executable, cmd]
def abbrev_cwd():
""" Return abbreviated version of cwd, e.g. d:mydir """
cwd = py3compat.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))
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