root / qa / colors.py @ 1490a90c
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1 | d5a9b556 | Petr Pudlak | #!/usr/bin/python -u
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2 | d5a9b556 | Petr Pudlak | #
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3 | d5a9b556 | Petr Pudlak | |
4 | d5a9b556 | Petr Pudlak | # Copyright (C) 2013 Google Inc.
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5 | d5a9b556 | Petr Pudlak | #
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6 | d5a9b556 | Petr Pudlak | # This program is free software; you can redistribute it and/or modify
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7 | d5a9b556 | Petr Pudlak | # it under the terms of the GNU General Public License as published by
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8 | d5a9b556 | Petr Pudlak | # the Free Software Foundation; either version 2 of the License, or
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9 | d5a9b556 | Petr Pudlak | # (at your option) any later version.
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10 | d5a9b556 | Petr Pudlak | #
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11 | d5a9b556 | Petr Pudlak | # This program is distributed in the hope that it will be useful, but
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12 | d5a9b556 | Petr Pudlak | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | d5a9b556 | Petr Pudlak | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | d5a9b556 | Petr Pudlak | # General Public License for more details.
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15 | d5a9b556 | Petr Pudlak | #
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16 | d5a9b556 | Petr Pudlak | # You should have received a copy of the GNU General Public License
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17 | d5a9b556 | Petr Pudlak | # along with this program; if not, write to the Free Software
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18 | d5a9b556 | Petr Pudlak | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | d5a9b556 | Petr Pudlak | # 02110-1301, USA.
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20 | d5a9b556 | Petr Pudlak | |
21 | d5a9b556 | Petr Pudlak | |
22 | d5a9b556 | Petr Pudlak | """Script for adding colorized output to Ganeti.
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23 | d5a9b556 | Petr Pudlak |
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24 | d5a9b556 | Petr Pudlak | Colors are enabled only if the standard output is a proper terminal.
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25 | 1490a90c | Petr Pudlak | (Or call check_for_colors() to make a thorough test using "tput".)
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26 | d5a9b556 | Petr Pudlak |
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27 | d5a9b556 | Petr Pudlak | """
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28 | d5a9b556 | Petr Pudlak | |
29 | d5a9b556 | Petr Pudlak | import os |
30 | 1490a90c | Petr Pudlak | import subprocess |
31 | d5a9b556 | Petr Pudlak | import sys |
32 | d5a9b556 | Petr Pudlak | |
33 | d5a9b556 | Petr Pudlak | DEFAULT = '\033[0m'
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34 | d5a9b556 | Petr Pudlak | RED = '\033[91m'
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35 | d5a9b556 | Petr Pudlak | GREEN = '\033[92m'
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36 | d5a9b556 | Petr Pudlak | BLUE = '\033[94m'
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37 | d5a9b556 | Petr Pudlak | CYAN = '\033[96m'
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38 | d5a9b556 | Petr Pudlak | WHITE = '\033[97m'
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39 | d5a9b556 | Petr Pudlak | YELLOW = '\033[93m'
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40 | d5a9b556 | Petr Pudlak | MAGENTA = '\033[95m'
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41 | d5a9b556 | Petr Pudlak | GREY = '\033[90m'
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42 | d5a9b556 | Petr Pudlak | BLACK = '\033[90m'
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43 | d5a9b556 | Petr Pudlak | |
44 | d5a9b556 | Petr Pudlak | _enabled = sys.stdout.isatty() |
45 | d5a9b556 | Petr Pudlak | |
46 | d5a9b556 | Petr Pudlak | |
47 | d5a9b556 | Petr Pudlak | def colorize(line, color=None): |
48 | d5a9b556 | Petr Pudlak | if _enabled and color is not None: |
49 | d5a9b556 | Petr Pudlak | return color + line + DEFAULT
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50 | d5a9b556 | Petr Pudlak | else:
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51 | d5a9b556 | Petr Pudlak | return line
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52 | 1490a90c | Petr Pudlak | |
53 | 1490a90c | Petr Pudlak | |
54 | 1490a90c | Petr Pudlak | def check_for_colors(): |
55 | 1490a90c | Petr Pudlak | """Tries to call 'tput' to properly determine, if the terminal has colors.
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56 | 1490a90c | Petr Pudlak |
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57 | 1490a90c | Petr Pudlak | This functions is meant to be run once at the program's start. If not
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58 | 1490a90c | Petr Pudlak | invoked, colors are enabled iff standard output is a terminal.
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59 | 1490a90c | Petr Pudlak | """
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60 | 1490a90c | Petr Pudlak | colors = 0
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61 | 1490a90c | Petr Pudlak | if sys.stdout.isatty():
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62 | 1490a90c | Petr Pudlak | try:
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63 | 1490a90c | Petr Pudlak | p = subprocess.Popen(["tput", "colors"], stdout=subprocess.PIPE) |
64 | 1490a90c | Petr Pudlak | output = p.communicate()[0]
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65 | 1490a90c | Petr Pudlak | if p.returncode == 0: |
66 | 1490a90c | Petr Pudlak | colors = int(output)
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67 | 1490a90c | Petr Pudlak | except (OSError, ValueError): |
68 | 1490a90c | Petr Pudlak | pass
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69 | 1490a90c | Petr Pudlak | global _enabled
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70 | 1490a90c | Petr Pudlak | _enabled = (colors >= 2) |