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#

#

# Copyright (C) 2014 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

""" Handles the logging of messages with appropriate coloring.

"""

import sys

_INFO_SEQ = None

_WARNING_SEQ = None

_ERROR_SEQ = None

_RESET_SEQ = None

def _SetupColours():

  """Initializes the colour constants.

  """

  # pylint: disable=W0603

  # due to global usage

  global _INFO_SEQ, _WARNING_SEQ, _ERROR_SEQ, _RESET_SEQ

  # Don't use colours if stdout isn't a terminal

  if not sys.stdout.isatty():

    return

  try:

    import curses

  except ImportError:

    # Don't use colours if curses module can't be imported

    return

  curses.setupterm()

  _RESET_SEQ = curses.tigetstr("op")

  setaf = curses.tigetstr("setaf")

  _INFO_SEQ = curses.tparm(setaf, curses.COLOR_GREEN)

  _WARNING_SEQ = curses.tparm(setaf, curses.COLOR_YELLOW)

  _ERROR_SEQ = curses.tparm(setaf, curses.COLOR_RED)

_SetupColours()

def _FormatWithColor(text, seq):

  if not seq:

    return text

  return "%s%s%s" % (seq, text, _RESET_SEQ)

FormatWarning = lambda text: _FormatWithColor(text, _WARNING_SEQ)

FormatError = lambda text: _FormatWithColor(text, _ERROR_SEQ)

FormatInfo = lambda text: _FormatWithColor(text, _INFO_SEQ)