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#!/usr/bin/python -u
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#
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# Copyright (C) 2013 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Script for adding colorized output to Ganeti.
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Colors are enabled only if the standard output is a proper terminal.
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(Or call check_for_colors() to make a thorough test using "tput".)
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"""
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import os
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import subprocess
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import sys
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DEFAULT = '\033[0m'
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RED = '\033[91m'
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GREEN = '\033[92m'
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BLUE = '\033[94m'
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CYAN = '\033[96m'
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WHITE = '\033[97m'
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YELLOW = '\033[93m'
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MAGENTA = '\033[95m'
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GREY = '\033[90m'
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BLACK = '\033[90m'
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_enabled = sys.stdout.isatty()
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def colorize(line, color=None):
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  if _enabled and color is not None:
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    return color + line + DEFAULT
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  else:
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    return line
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def check_for_colors():
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  """Tries to call 'tput' to properly determine, if the terminal has colors.
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  This functions is meant to be run once at the program's start. If not
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  invoked, colors are enabled iff standard output is a terminal.
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  """
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  colors = 0
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  if sys.stdout.isatty():
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    try:
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      p = subprocess.Popen(["tput", "colors"], stdout=subprocess.PIPE)
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      output = p.communicate()[0]
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      if p.returncode == 0:
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        colors = int(output)
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    except (OSError, ValueError):
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      pass
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  global _enabled
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  _enabled = (colors >= 2)