A fast, lightweight and minimalistic Wayland terminal emulator
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99 lines
3.2 KiB

#!/usr/bin/env python3
import argparse
import enum
import shutil
import sys
class ColorVariant(enum.IntEnum):
NONE = enum.auto()
REGULAR = enum.auto()
BRIGHT = enum.auto()
RGB = enum.auto()
def main():
parser = argparse.ArgumentParser()
parser.add_argument(
'out', type=argparse.FileType(mode='w'), nargs='?', help='name of output file')
parser.add_argument('--colors-regular', action='store_true')
parser.add_argument('--colors-bright', action='store_true')
parser.add_argument('--colors-rgb', action='store_true')
parser.add_argument('--scroll', action='store_true')
parser.add_argument('--scroll-region', action='store_true')
opts = parser.parse_args()
out = opts.out if opts.out is not None else sys.stdout
term_size = shutil.get_terminal_size()
lines = term_size.lines
cols = term_size.columns
# Number of characters to write to screen
count = 256 * 1024**1
# Characters to choose from
alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRTSTUVWXYZ0123456789 '
color_variants = ([ColorVariant.NONE] +
([ColorVariant.REGULAR] if opts.colors_regular else []) +
([ColorVariant.BRIGHT] if opts.colors_bright else []) +
([ColorVariant.RGB] if opts.colors_rgb else []))
# Enter alt screen
out.write('\033[?1049h')
with open('/dev/urandom', 'rb') as rand:
for _ in range(count):
if opts.scroll and rand.read(1)[0] == 0:
out.write('\033[m')
if opts.scroll_region and rand.read(1)[0] == 0:
top = rand.read(1)[0] % 3
bottom = rand.read(1)[0] % 3
out.write(f'\033[{top};{lines - bottom}r')
count = rand.read(1)[0] % (lines - 1)
rev = rand.read(1)[0] % 2
out.write(f'\033[{count + 1}{"T" if rev == 1 else "S"}')
continue
# Generate a random location and a random character
row = rand.read(1)[0] % lines
col = rand.read(1)[0] % cols
c = alphabet[rand.read(1)[0] % len(alphabet)]
repeat = rand.read(1)[0] % (cols - col) + 1
assert col + repeat <= cols
color_variant = color_variants[rand.read(1)[0] % len(color_variants)]
# Position cursor
out.write(f'\033[{row + 1};{col + 1}H')
if color_variant in [ColorVariant.REGULAR, ColorVariant.BRIGHT]:
do_bg = rand.read(1)[0] % 2
base = 40 if do_bg else 30
base += 60 if color_variant == ColorVariant.BRIGHT else 0
idx = rand.read(1)[0] % 8
out.write(f'\033[{base + idx}m')
elif color_variant == ColorVariant.RGB:
do_bg = rand.read(1)[0] % 2
rgb = rand.read(3)
out.write(f'\033[{48 if do_bg else 38}:2::{rgb[0]}:{rgb[1]}:{rgb[2]}m')
out.write(c * repeat)
if color_variant != ColorVariant.NONE:
do_sgr_reset = rand.read(1)[0] % 2
if do_sgr_reset:
out.write('\033[m')
# Leave alt screen
out.write('\033[m\033[r\033[?1049l')
if __name__ == '__main__':
sys.exit(main())