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Terminal output colors in python
from __future__ import print_function
"""
Utilities for 256 color support in terminals.
Adapted from:
http://stackoverflow.com/questions/1403353/256-color-terminal-library-for-ruby
The color palette is indexed as follows:
0-15: System colors
0 black 8 dark gray
1 red 9 bright red
2 green 10 bright green
3 yellow 11 bright yellow
4 blue 12 bright blue
5 magenta 13 bright magenta
6 cyan 14 bright cyan
7 light gray 15 white
16-231: 6x6x6 Color Cube
All combinations of red, green, and blue from 0 to 5.
232-255: Grayscale Ramp
24 shades of gray, not including black and white.
"""
# System color name constants.
(
BLACK,
RED,
GREEN,
YELLOW,
BLUE,
MAGENTA,
CYAN,
LIGHT_GRAY,
DARK_GRAY,
BRIGHT_RED,
BRIGHT_GREEN,
BRIGHT_YELLOW,
BRIGHT_BLUE,
BRIGHT_MAGENTA,
BRIGHT_CYAN,
WHITE,
) = range(16)
def rgb(red, green, blue):
"""
Calculate the palette index of a color in the 6x6x6 color cube.
The red, green and blue arguments may range from 0 to 5.
"""
return 16 + (red * 36) + (green * 6) + blue
def gray(value):
"""
Calculate the palette index of a color in the grayscale ramp.
The value argument may range from 0 to 23.
"""
return 232 + value
def set_color(fg=None, bg=None):
"""
Print escape codes to set the terminal color.
fg and bg are indices into the color palette for the foreground and
background colors.
"""
print(_set_color(fg, bg), end='')
def _set_color(fg=None, bg=None):
result = ''
if fg:
result += '\x1b[38;5;%dm' % fg
if bg:
result += '\x1b[48;5;%dm' % bg
return result
def reset_color():
"""
Reset terminal color to default.
"""
print(_reset_color(), end='')
def _reset_color():
return '\x1b[0m'
def print_color(*args, **kwargs):
"""
Print function, with extra arguments fg and bg to set colors.
"""
fg = kwargs.pop('fg', None)
bg = kwargs.pop('bg', None)
set_color(fg, bg)
print(*args, **kwargs)
reset_color()
def format_color(string, fg=None, bg=None):
return _set_color(fg, bg) + string + _reset_color()
if __name__ == '__main__':
# Print a test graphic showing all colors.
print('System colors:')
for c in range(8):
print_color(' ', bg=c, end='')
print()
for c in range(8, 16):
print_color(' ', bg=c, end='')
print()
print()
print('RGB color cube, 6x6x6:')
for green in range(6):
for red in range(6):
for blue in range(6):
print_color(' ', bg=rgb(red, green, blue), end='')
print(' ', end='')
print()
print()
print('Grayscale ramp, with RGB grays:')
for value in range(24):
print_color(' ', bg=gray(value), end='')
print()
print_color(' ', bg=rgb(0, 0, 0), end='')
print(' '*7, end='')
print_color(' ', bg=rgb(1, 1, 1), end='')
print(' '*2, end='')
print_color(' ', bg=rgb(2, 2, 2), end='')
print(' '*2, end='')
print_color(' ', bg=rgb(3, 3, 3), end='')
print(' '*2, end='')
print_color(' ', bg=rgb(4, 4, 4), end='')
print(' ', end='')
print_color(' ', bg=rgb(5, 5, 5), end='')
print()
@Bengt

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Bengt commented Jul 27, 2014

Is it intended that in line 115 - 117 you iterate over green first, then red and then blue? I would expect to loop over red, green and then blue, because that would result in an ascending order by value of rgb(red, green, blue).

@Bengt

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Bengt commented Jul 27, 2014

KDE's konsole is doing it that way, too. And they also calculate the index as 16 + ($red * 36) + ($green * 6) + $blue, so they also print the colors in non-ascending order.

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