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hartwork/demo_ansi_colors.py

Created February 1, 2022 16:58
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demo_ansi_colors.py
# Copyright (c) 2022 Sebastian Pipping <sebastian@pipping.org>
# Licensed under the Apache license version 2.0
#
# Needs Python >=3.6
# Version 2022-02-01 17:50 UTC+1
_full_block_char = '\u2588'
_ansi_escape = '\u001b'
_ansi_reset = f'{_ansi_escape}[0m'
_demo_text = 2 * _full_block_char
def _3bit_ansi_foreground(i, bright):
assert 0 <= i < 8
i += 30
bright_mod = ';1' if bright else ''
return f'{_ansi_escape}[{i}{bright_mod}m'
def _4bit_ansi_foreground(i):
assert 0 <= i < 8
i += 90
return f'{_ansi_escape}[{i}m'
def _8bit_ansi_foreground(i):
assert i <= i <= 255
return f'{_ansi_escape}[38;5;{i}m'
print('3bit')
for bright in (False, True):
for i in range(8):
print(f"{_3bit_ansi_foreground(i, bright=bright)}{_demo_text}{_ansi_reset}", end="")
print()
print()
print('4bit')
for i in range(8):
print(f"{_3bit_ansi_foreground(i, bright=False)}{_demo_text}{_ansi_reset}", end="")
print()
for i in range(8):
print(f"{_4bit_ansi_foreground(i)}{_demo_text}{_ansi_reset}", end="")
print()
print()
print('8bit')
for i in range(256):
print(f"{_8bit_ansi_foreground(i)}{_demo_text}{_ansi_reset}", end="")
if i % 8 == 7:
print()
print()
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