#!/usr/bin/env python3 import argparse import enum import fcntl import struct import random import sys import termios class ColorVariant(enum.IntEnum): NONE = enum.auto() REGULAR = enum.auto() BRIGHT = enum.auto() CUBE = 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('--cols', type=int) parser.add_argument('--rows', type=int) parser.add_argument('--colors-regular', action='store_true') parser.add_argument('--colors-bright', action='store_true') parser.add_argument('--colors-256', 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') parser.add_argument('--attr-bold', action='store_true') parser.add_argument('--attr-italic', action='store_true') parser.add_argument('--attr-underline', action='store_true') parser.add_argument('--sixel', action='store_true') parser.add_argument('--seed', type=int) opts = parser.parse_args() out = opts.out if opts.out is not None else sys.stdout lines, cols, height, width = struct.unpack( 'HHHH', fcntl.ioctl(sys.stdout.fileno(), termios.TIOCGWINSZ, struct.pack('HHHH', 0, 0, 0, 0))) if opts.rows is not None: lines = opts.rows if opts.cols is not None: cols = opts.cols # Number of characters to write to screen count = 256 * 1024**1 # Characters to choose from alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRTSTUVWXYZ0123456789 öäå 👨👩🧒' color_variants = ([ColorVariant.NONE] + ([ColorVariant.REGULAR] if opts.colors_regular else []) + ([ColorVariant.BRIGHT] if opts.colors_bright else []) + ([ColorVariant.CUBE] if opts.colors_256 else []) + ([ColorVariant.RGB] if opts.colors_rgb else [])) # Enter alt screen out.write('\033[?1049h') # uses system time or /dev/urandom if available if opt.seed == None # pin seeding method to make seeding stable across future versions random.seed(a=opts.seed, version=2) for _ in range(count): if opts.scroll and random.randrange(256) == 0: out.write('\033[m') if opts.scroll_region and random.randrange(256) == 0: top = random.randrange(3) bottom = random.randrange(3) out.write(f'\033[{top};{lines - bottom}r') lines_to_scroll = random.randrange(lines - 1) rev = random.randrange(2) if not rev and random.randrange(2): out.write(f'\033[{lines};{cols}H') out.write('\n' * lines_to_scroll) else: out.write(f'\033[{lines_to_scroll + 1}{"T" if rev == 1 else "S"}') continue # Generate a random location and a random character row = random.randrange(lines) col = random.randrange(cols) c = random.choice(alphabet) repeat = random.randrange((cols - col) + 1) assert col + repeat <= cols color_variant = random.choice(color_variants) # Position cursor out.write(f'\033[{row + 1};{col + 1}H') if color_variant in [ColorVariant.REGULAR, ColorVariant.BRIGHT]: do_bg = random.randrange(2) base = 40 if do_bg else 30 base += 60 if color_variant == ColorVariant.BRIGHT else 0 idx = random.randrange(8) out.write(f'\033[{base + idx}m') elif color_variant == ColorVariant.CUBE: do_bg = random.randrange(2) base = 48 if do_bg else 38 idx = random.randrange(256) if random.randrange(2): # Old-style out.write(f'\033[{base};5;{idx}m') else: # New-style (sub-parameter based) out.write(f'\033[{base}:5:{idx}m') elif color_variant == ColorVariant.RGB: do_bg = random.randrange(2) base = 48 if do_bg else 38 # use list comprehension in favor of randbytes(n) # which is only available for Python >= 3.9 rgb = [random.randrange(256) for _ in range(3)] if random.randrange(2): # Old-style out.write(f'\033[{base};2;{rgb[0]};{rgb[1]};{rgb[2]}m') else: # New-style (sub-parameter based) out.write(f'\033[{base}:2::{rgb[0]}:{rgb[1]}:{rgb[2]}m') if opts.attr_bold and random.randrange(5) == 0: out.write('\033[1m') if opts.attr_italic and random.randrange(5) == 0: out.write('\033[3m') if opts.attr_underline and random.randrange(5) == 0: out.write('\033[4m') out.write(c * repeat) do_sgr_reset = random.randrange(2) if do_sgr_reset: reset_actions = ['\033[m', '\033[39m', '\033[49m'] out.write(random.choice(reset_actions)) # Leave alt screen out.write('\033[m\033[r\033[?1049l') if opts.sixel: # The sixel 'alphabet' sixels = '?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~' for _ in range(200): # Offset image out.write(' ' * (random.randrange(cols // 2))) # Begin sixel out.write('\033Pq') # Set up 256 random colors for idx in range(256): # param 2: 1=HLS, 2=RGB. # param 3/4/5: HLS/RGB values in range 0-100 # (except 'hue' which is 0..360) out.write(f'#{idx};2;{random.randrange(101)};{random.randrange(101)};{random.randrange(101)}') # Randomize image width/height six_height = random.randrange(height // 2) six_width = random.randrange(width // 2) # Sixel size. Without this, sixels will be # auto-resized on cell-boundaries. We expect programs # to emit this sequence since otherwise you cannot get # correctly sized images. out.write(f'"0;0;{six_width};{six_height}') for row in range(six_height // 6): # Each sixel is 6 pixels # Choose a random color out.write(f'#{random.randrange(256)}') for col in range(six_width): out.write(f'{random.choice(sixels)}') # Next line out.write('-') # End sixel out.write('\033\\') if __name__ == '__main__': sys.exit(main())