#!/usr/bin/env python
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"""Verifies that Google Test correctly determines whether to use colors."""

__author__ = 'wan@google.com (Zhanyong Wan)'

import gtest_test_utils
import os
import sys
import unittest


COLOR_ENV_VAR = 'GTEST_COLOR'
COLOR_FLAG = 'gtest_color'
COMMAND = os.path.join(gtest_test_utils.GetBuildDir(),
                       'gtest_color_test_')


def SetEnvVar(env_var, value):
  """Sets the env variable to 'value'; unsets it when 'value' is None."""

  if value is not None:
    os.environ[env_var] = value
  elif env_var in os.environ:
    del os.environ[env_var]


def UsesColor(term, color_env_var, color_flag):
  """Runs gtest_color_test_ and returns its exit code."""

  SetEnvVar('TERM', term)
  SetEnvVar(COLOR_ENV_VAR, color_env_var)
  cmd = COMMAND
  if color_flag is not None:
    cmd += ' --%s=%s' % (COLOR_FLAG, color_flag)
  return gtest_test_utils.GetExitStatus(os.system(cmd))


class GTestColorTest(unittest.TestCase):
  def testNoEnvVarNoFlag(self):
    """Tests the case when there's neither GTEST_COLOR nor --gtest_color."""

    self.assert_(not UsesColor('dumb', None, None))
    self.assert_(not UsesColor('emacs', None, None))
    self.assert_(not UsesColor('xterm-mono', None, None))
    self.assert_(not UsesColor('unknown', None, None))
    self.assert_(not UsesColor(None, None, None))
    self.assert_(UsesColor('cygwin', None, None))
    self.assert_(UsesColor('xterm', None, None))
    self.assert_(UsesColor('xterm-color', None, None))

  def testFlagOnly(self):
    """Tests the case when there's --gtest_color but not GTEST_COLOR."""

    self.assert_(not UsesColor('dumb', None, 'no'))
    self.assert_(not UsesColor('xterm-color', None, 'no'))
    self.assert_(not UsesColor('emacs', None, 'auto'))
    self.assert_(UsesColor('xterm', None, 'auto'))
    self.assert_(UsesColor('dumb', None, 'yes'))
    self.assert_(UsesColor('xterm', None, 'yes'))

  def testEnvVarOnly(self):
    """Tests the case when there's GTEST_COLOR but not --gtest_color."""

    self.assert_(not UsesColor('dumb', 'no', None))
    self.assert_(not UsesColor('xterm-color', 'no', None))
    self.assert_(not UsesColor('dumb', 'auto', None))
    self.assert_(UsesColor('xterm-color', 'auto', None))
    self.assert_(UsesColor('dumb', 'yes', None))
    self.assert_(UsesColor('xterm-color', 'yes', None))

  def testEnvVarAndFlag(self):
    """Tests the case when there are both GTEST_COLOR and --gtest_color."""

    self.assert_(not UsesColor('xterm-color', 'no', 'no'))
    self.assert_(UsesColor('dumb', 'no', 'yes'))
    self.assert_(UsesColor('xterm-color', 'no', 'auto'))

  def testAliasesOfYesAndNo(self):
    """Tests using aliases in specifying --gtest_color."""

    self.assert_(UsesColor('dumb', None, 'true'))
    self.assert_(UsesColor('dumb', None, 'YES'))
    self.assert_(UsesColor('dumb', None, 'T'))
    self.assert_(UsesColor('dumb', None, '1'))

    self.assert_(not UsesColor('xterm', None, 'f'))
    self.assert_(not UsesColor('xterm', None, 'false'))
    self.assert_(not UsesColor('xterm', None, '0'))
    self.assert_(not UsesColor('xterm', None, 'unknown'))


if __name__ == '__main__':
  gtest_test_utils.Main()