# encoding: utf-8
"""
Tests for platutils.py
"""

#-----------------------------------------------------------------------------
#  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
#-----------------------------------------------------------------------------

import sys
import os
import time
from _thread import interrupt_main  # Py 3
import threading
from unittest import SkipTest

import nose.tools as nt

from IPython.utils.process import (find_cmd, FindCmdError, arg_split,
                                   system, getoutput, getoutputerror,
                                   get_output_error_code)
from IPython.utils.capture import capture_output
from IPython.testing import decorators as dec
from IPython.testing import tools as tt

python = os.path.basename(sys.executable)

#-----------------------------------------------------------------------------
# Tests
#-----------------------------------------------------------------------------


@dec.skip_win32
def test_find_cmd_ls():
    """Make sure we can find the full path to ls."""
    path = find_cmd('ls')
    nt.assert_true(path.endswith('ls'))

    
def has_pywin32():
    try:
        import win32api
    except ImportError:
        return False
    return True


@dec.onlyif(has_pywin32, "This test requires win32api to run")
def test_find_cmd_pythonw():
    """Try to find pythonw on Windows."""
    path = find_cmd('pythonw')
    assert path.lower().endswith('pythonw.exe'), path


@dec.onlyif(lambda : sys.platform != 'win32' or has_pywin32(),
            "This test runs on posix or in win32 with win32api installed")
def test_find_cmd_fail():
    """Make sure that FindCmdError is raised if we can't find the cmd."""
    nt.assert_raises(FindCmdError,find_cmd,'asdfasdf')

    
@dec.skip_win32
def test_arg_split():
    """Ensure that argument lines are correctly split like in a shell."""
    tests = [['hi', ['hi']],
             [u'hi', [u'hi']],
             ['hello there', ['hello', 'there']],
             # \u01ce == \N{LATIN SMALL LETTER A WITH CARON}
             # Do not use \N because the tests crash with syntax error in
             # some cases, for example windows python2.6.
             [u'h\u01cello', [u'h\u01cello']],
             ['something "with quotes"', ['something', '"with quotes"']],
             ]
    for argstr, argv in tests:
        nt.assert_equal(arg_split(argstr), argv)
    
@dec.skip_if_not_win32
def test_arg_split_win32():
    """Ensure that argument lines are correctly split like in a shell."""
    tests = [['hi', ['hi']],
             [u'hi', [u'hi']],
             ['hello there', ['hello', 'there']],
             [u'h\u01cello', [u'h\u01cello']],
             ['something "with quotes"', ['something', 'with quotes']],
             ]
    for argstr, argv in tests:
        nt.assert_equal(arg_split(argstr), argv)


class SubProcessTestCase(tt.TempFileMixin):
    def setUp(self):
        """Make a valid python temp file."""
        lines = [ "import sys",
                 "print('on stdout', end='', file=sys.stdout)",
                 "print('on stderr', end='', file=sys.stderr)",
                 "sys.stdout.flush()",
                 "sys.stderr.flush()"]
        self.mktmp('\n'.join(lines))

    def test_system(self):
        status = system('%s "%s"' % (python, self.fname))
        self.assertEqual(status, 0)

    def test_system_quotes(self):
        status = system('%s -c "import sys"' % python)
        self.assertEqual(status, 0)

    def assert_interrupts(self, command):
        """
        Interrupt a subprocess after a second.
        """
        if threading.main_thread() != threading.current_thread():
            raise nt.SkipTest("Can't run this test if not in main thread.")

        def interrupt():
            # Wait for subprocess to start:
            time.sleep(0.5)
            interrupt_main()

        threading.Thread(target=interrupt).start()
        start = time.time()
        try:
            result = command()
        except KeyboardInterrupt:
            # Success!
            return
        end = time.time()
        self.assertTrue(
            end - start < 2, "Process didn't die quickly: %s" % (end - start)
        )
        return result

    def test_system_interrupt(self):
        """
        When interrupted in the way ipykernel interrupts IPython, the
        subprocess is interrupted.
        """
        def command():
            return system('%s -c "import time; time.sleep(5)"' % python)

        status = self.assert_interrupts(command)
        self.assertNotEqual(
            status, 0, "The process wasn't interrupted. Status: %s" % (status,)
        )

    def test_stderr_while_stdout_open(self):
        """
        If lots of data is written to stderr while stdout is still open, enough
        data to fill the pipe buffer in fact, the process still exits (i.e.
        there is no deadlock).
        """
        with capture_output(display=False):
            system(("%s -c 'import sys\nfor i in range(2000): " +
                    "sys.stderr.write(\" \" * 100 + \"\\n\")'") % (python,))

    def test_getoutput(self):
        out = getoutput('%s "%s"' % (python, self.fname))
        # we can't rely on the order the line buffered streams are flushed
        try:
            self.assertEqual(out, 'on stderron stdout')
        except AssertionError:
            self.assertEqual(out, 'on stdouton stderr')

    def test_getoutput_interrupt(self):
        """
        When interrupted in the way ipykernel interrupts IPython, the
        subprocess is interrupted.
        """
        raise SkipTest("This fails on POSIX too, revisit in future.")
        def command():
            return getoutput('%s -c "import time; time.sleep(5)"' % (python, ))

        self.assert_interrupts(command)

    def test_getoutput_quoted(self):
        out = getoutput('%s -c "print (1)"' % python)
        self.assertEqual(out.strip(), '1')

    #Invalid quoting on windows
    @dec.skip_win32
    def test_getoutput_quoted2(self):
        out = getoutput("%s -c 'print (1)'" % python)
        self.assertEqual(out.strip(), '1')
        out = getoutput("%s -c 'print (\"1\")'" % python)
        self.assertEqual(out.strip(), '1')

    def test_getoutput_error(self):
        out, err = getoutputerror('%s "%s"' % (python, self.fname))
        self.assertEqual(out, 'on stdout')
        self.assertEqual(err, 'on stderr')

    def test_get_output_error_code(self):
        quiet_exit = '%s -c "import sys; sys.exit(1)"' % python
        out, err, code = get_output_error_code(quiet_exit)
        self.assertEqual(out, '')
        self.assertEqual(err, '')
        self.assertEqual(code, 1)
        out, err, code = get_output_error_code('%s "%s"' % (python, self.fname))
        self.assertEqual(out, 'on stdout')
        self.assertEqual(err, 'on stderr')
        self.assertEqual(code, 0)

        

@@ -5314,16 +5314,17 @@
 nge(2000
+0
 ): %22 +%0A 

Increase write size.