blocktext.py

#!/usr/bin/env python

from array import array
from itertools import repeat
from sys import argv, stdin, exit
from enum import Enum, auto
from dataclasses import dataclass

NEWLINE = ord('\n')
MINCHAR = ord(' ')
MAXCHAR = ord('~')

TESTSTR = """ !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~я"""

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CHARS3 = array('w', ' 🬀🬃🬄🬏🬐🬓▌🬁🬂🬅🬆🬑🬒🬔🬕🬇🬈🬋🬌🬖🬗🬚🬛🬉🬊🬍🬎🬘🬙🬜🬝🬞🬟🬢🬣🬭🬮🬱🬲🬠🬡🬤🬥🬯🬰🬳🬴🬦🬧🬩🬪🬵🬶🬹🬺▐🬨🬫🬬🬷🬸🬻█')

CHARS4 = array('w', ' 𜺨𜴀▘𜴉𜴊🯦𜴍𜺣𜴶𜴹𜴺▖𜵅𜵈▌𜺫🮂𜴁𜴂𜴋𜴌𜴎𜴏𜴷𜴸𜴻𜴼𜵆𜵇𜵉𜵊𜴃𜴄𜴆𜴇𜴐𜴑𜴔𜴕𜴽𜴾𜵁𜵂𜵋𜵌𜵎𜵏▝𜴅𜴈▀𜴒𜴓𜴖𜴗𜴿𜵀𜵃𜵄▞𜵍𜵐▛'
                    '𜴘𜴙𜴜𜴝𜴧𜴨𜴫𜴬𜵑𜵒𜵕𜵖𜵡𜵢𜵥𜵦𜴚𜴛𜴞𜴟𜴩𜴪𜴭𜴮𜵓𜵔𜵗𜵘𜵣𜵤𜵧𜵨🯧𜴠𜴣𜴤𜴯𜴰𜴳𜴴𜵙𜵚𜵝𜵞𜵩𜵪𜵭𜵮𜴡𜴢𜴥𜴦𜴱𜴲𜴵🮅𜵛𜵜𜵟𜵠𜵫𜵬𜵯𜵰'
                    '𜺠𜵱𜵴𜵵𜶀𜶁𜶄𜶅▂𜶬𜶯𜶰𜶻𜶼𜶿𜷀𜵲𜵳𜵶𜵷𜶂𜶃𜶆𜶇𜶭𜶮𜶱𜶲𜶽𜶾𜷁𜷂𜵸𜵹𜵼𜵽𜶈𜶉𜶌𜶍𜶳𜶴𜶷𜶸𜷃𜷄𜷇𜷈𜵺𜵻𜵾𜵿𜶊𜶋𜶎𜶏𜶵𜶶𜶹𜶺𜷅𜷆𜷉𜷊'
                    '▗𜶐𜶓▚𜶜𜶝𜶠𜶡𜷋𜷌𜷏𜷐▄𜷛𜷞▙𜶑𜶒𜶔𜶕𜶞𜶟𜶢𜶣𜷍𜷎𜷑𜷒𜷜𜷝𜷟𜷠𜶖𜶗𜶙𜶚𜶤𜶥𜶨𜶩𜷓𜷔𜷗𜷘𜷡𜷢▆𜷤▐𜶘𜶛▜𜶦𜶧𜶪𜶫𜷕𜷖𜷙𜷚▟𜷣𜷥█')

class Mode(Enum):
    SEXTANTS = auto()
    OCTANTS = auto()

@dataclass
class BigFontLUT:
    font : tuple[tuple[int]]
    chars : array
    shift : int

MODES : dict[Mode, BigFontLUT] = {
    Mode.SEXTANTS: BigFontLUT(FONT3, CHARS3, 3),
    Mode.OCTANTS: BigFontLUT(FONT4, CHARS4, 4)
}

def text_to_block(text : str, mode : Mode) -> str:
    gfx = list()
    gfx.append(list())
    line = 0

    font = MODES[mode].font
    chars = MODES[mode].chars
    shift = MODES[mode].shift

    # build up column bits
    for c in text:
        n = ord(c)
        if n == NEWLINE:
            if len(gfx[line]) % 2 == 1:
                gfx[line].append(0)
            gfx.append(list())
            line += 1
        elif n < MINCHAR or n > MAXCHAR:
            gfx[line].extend(font[0])
        else:
            gfx[line].extend(font[n - MINCHAR + 1])

    # pack the bits
    totallen = 0
    for lnum, line in enumerate(gfx):
        totallen += len(line) // 2 + 1
        for num in range(len(line) // 2):
            gfx[lnum][num] = gfx[lnum][num * 2] | (gfx[lnum][num * 2 + 1] << shift)
        gfx[lnum] = gfx[lnum][:len(gfx[lnum]) // 2]
    totallen -= 1

    # generate the output string
    outtext = array('w', repeat(' ', totallen))
    pos = 0
    for lnum, line in enumerate(gfx):
        for num, val in enumerate(line):
            outtext[pos + num] = chars[val]
        if lnum < len(gfx) - 1:
            pos += len(line)
            outtext[pos] = '\n'
            pos += 1

    return outtext.tounicode()

def main():
    mode = Mode.SEXTANTS
    had_arg = 1
    if len(argv) > 1:
        if argv[1].startswith('--'):
            arg = argv[1][2:]
            if arg == 'help':
                print(f"USAGE: {argv[0]} [--help] [--sextants] [--octants] [--test] [text...]\n" \
                      f"  --help - output this text\n" \
                      f"  --sextants - Use 3 pixel tall font.  Less readable, more compatible.\n" \
                      f"  --octants - Use 4 pixel tall font.  More readable, less compatible.\n" \
                      f"  --test - Test mode.\n" \
                      f"  text... - optional text provided on the command line, otherwise read from stdin.\n")
                exit(0)
            elif arg == 'sextants':
                mode = Mode.SEXTANTS
                had_arg = 2
            elif arg == 'octants':
                mode = Mode.OCTANTS
                had_arg = 2
            elif arg == 'test':
                print(text_to_block(TESTSTR, Mode.SEXTANTS))
                print(text_to_block(TESTSTR, Mode.OCTANTS))
                exit(0)

    if len(argv[had_arg:]) > 0:
        print(text_to_block(' '.join(argv[had_arg:]), mode))
    else:
        while True:
            text = stdin.read()
            if len(text) == 0:
                break
            print(text_to_block(text, mode))

if __name__ == '__main__':
    main()