#! /usr/bin/env python

"""Basic tests for os.popen()

  Particularly useful for platforms that fake popen.

"""

import os

import sys

from test.test_support import TestSkipped, reap_children

from os import popen

# Test that command-lines get down as we expect.

# To do this we execute:

#    python -c "import sys;print sys.argv" {rest_of_commandline}

# This results in Python being spawned and printing the sys.argv list.

# We can then eval() the result of this, and see what each argv was.

python = sys.executable

if ' ' in python:

    python = '"' + python + '"'     # quote embedded space for cmdline

def _do_test_commandline(cmdline, expected):

    cmd = '%s -c "import sys;print sys.argv" %s' % (python, cmdline)

    data = popen(cmd).read()

    got = eval(data)[1:] # strip off argv[0]

    if got != expected:

        print "Error in popen commandline handling."

        print " executed '%s', expected '%r', but got '%r'" \

                                                    % (cmdline, expected, got)

def _test_commandline():

    _do_test_commandline("foo bar", ["foo", "bar"])

    _do_test_commandline('foo "spam and eggs" "silly walk"', ["foo", "spam and eggs", "silly walk"])

    _do_test_commandline('foo "a \\"quoted\\" arg" bar', ["foo", 'a "quoted" arg', "bar"])

    print "popen seemed to process the command-line correctly"

def main():

    print "Test popen:"

    _test_commandline()

    reap_children()

main()