print out the cp437 glyph table

cp437

#!/usr/bin/env python
# print cp437 glyphs

# 0x00 ␀  0x20    0x40 @  0x60 `  0x80 Ç  0xA0 á  0xC0 └  0xE0 α
# 0x01 ☺  0x21 !  0x41 A  0x61 a  0x81 ü  0xA1 í  0xC1 ┴  0xE1 ß
# 0x02 ☻  0x22 "  0x42 B  0x62 b  0x82 é  0xA2 ó  0xC2 ┬  0xE2 Γ
# 0x03 ♥  0x23 #  0x43 C  0x63 c  0x83 â  0xA3 ú  0xC3 ├  0xE3 π
# 0x04 ♦  0x24 $  0x44 D  0x64 d  0x84 ä  0xA4 ñ  0xC4 ─  0xE4 Σ
# 0x05 ♣  0x25 %  0x45 E  0x65 e  0x85 à  0xA5 Ñ  0xC5 ┼  0xE5 σ
# 0x06 ♠  0x26 &  0x46 F  0x66 f  0x86 å  0xA6 ª  0xC6 ╞  0xE6 µ
# 0x07 •  0x27 '  0x47 G  0x67 g  0x87 ç  0xA7 º  0xC7 ╟  0xE7 τ
# 0x08 ◘  0x28 (  0x48 H  0x68 h  0x88 ê  0xA8 ¿  0xC8 ╚  0xE8 Φ
# 0x09 ○  0x29 )  0x49 I  0x69 i  0x89 ë  0xA9 ⌐  0xC9 ╔  0xE9 Θ
# 0x0A ◙  0x2A *  0x4A J  0x6A j  0x8A è  0xAA ¬  0xCA ╩  0xEA Ω
# 0x0B ♂  0x2B +  0x4B K  0x6B k  0x8B ï  0xAB ½  0xCB ╦  0xEB δ
# 0x0C ♀  0x2C ,  0x4C L  0x6C l  0x8C î  0xAC ¼  0xCC ╠  0xEC ∞
# 0x0D ♪  0x2D -  0x4D M  0x6D m  0x8D ì  0xAD ¡  0xCD ═  0xED φ
# 0x0E ♫  0x2E .  0x4E N  0x6E n  0x8E Ä  0xAE «  0xCE ╬  0xEE ε
# 0x0F ☼  0x2F /  0x4F O  0x6F o  0x8F Å  0xAF »  0xCF ╧  0xEF ∩
# 0x10 ►  0x30 0  0x50 P  0x70 p  0x90 É  0xB0 ░  0xD0 ╨  0xF0 ≡
# 0x11 ◄  0x31 1  0x51 Q  0x71 q  0x91 æ  0xB1 ▒  0xD1 ╤  0xF1 ±
# 0x12 ↕  0x32 2  0x52 R  0x72 r  0x92 Æ  0xB2 ▓  0xD2 ╥  0xF2 ≥
# 0x13 ‼  0x33 3  0x53 S  0x73 s  0x93 ô  0xB3 │  0xD3 ╙  0xF3 ≤
# 0x14 ¶  0x34 4  0x54 T  0x74 t  0x94 ö  0xB4 ┤  0xD4 ╘  0xF4 ⌠
# 0x15 §  0x35 5  0x55 U  0x75 u  0x95 ò  0xB5 ╡  0xD5 ╒  0xF5 ⌡
# 0x16 ▬  0x36 6  0x56 V  0x76 v  0x96 û  0xB6 ╢  0xD6 ╓  0xF6 ÷
# 0x17 ↨  0x37 7  0x57 W  0x77 w  0x97 ù  0xB7 ╖  0xD7 ╫  0xF7 ≈
# 0x18 ↑  0x38 8  0x58 X  0x78 x  0x98 ÿ  0xB8 ╕  0xD8 ╪  0xF8 °
# 0x19 ↓  0x39 9  0x59 Y  0x79 y  0x99 Ö  0xB9 ╣  0xD9 ┘  0xF9 ∙
# 0x1A →  0x3A :  0x5A Z  0x7A z  0x9A Ü  0xBA ║  0xDA ┌  0xFA ·
# 0x1B ←  0x3B ;  0x5B [  0x7B {  0x9B ¢  0xBB ╗  0xDB █  0xFB √
# 0x1C ∟  0x3C <  0x5C \  0x7C |  0x9C £  0xBC ╝  0xDC ▄  0xFC ⁿ
# 0x1D ↔  0x3D =  0x5D ]  0x7D }  0x9D ¥  0xBD ╜  0xDD ▌  0xFD ²
# 0x1E ▲  0x3E >  0x5E ^  0x7E ~  0x9E ₧  0xBE ╛  0xDE ▐  0xFE ■
# 0x1F ▼  0x3F ?  0x5F _  0x7F ⌂  0x9F ƒ  0xBF ┐  0xDF ▀  0xFF

import argparse

parser = argparse.ArgumentParser()
parser.add_argument("-l", "--labels", action="store_true", help="show labels for control codes")
args = parser.parse_args()

labels = {
    0x00: "NULL",
    0x07: "BELL",
    0x09: "TAB",
    0x0A: "LF",
    0x0D: "CR",
    0x1B: "ESC",
    0x20: "SPC",
    0x7F: "DEL",
}

control_glyphs = "␀☺☻♥♦♣♠•◘○◙♂♀♪♫☼►◄↕‼¶§▬↨↑↓→←∟↔▲▼"


def glyph(i):
    if i < 0x20:
        return control_glyphs[i]
    if i == 0x7F:
        return "⌂"
    return bytes([i]).decode("cp437")


def entry(i):
    g = glyph(i)
    if args.labels and i in labels:
        return f"0x{i:02X} {g} ({labels[i]})"
    return f"0x{i:02X} {g}"


entries = [entry(i) for i in range(256)]
col_width = max(len(e) for e in entries)
cols = 8 if not args.labels else 6
rows = 256 // cols + (1 if 256 % cols else 0)

for row in range(rows):
    cells = []
    for col in range(cols):
        i = col * rows + row
        if i < 256:
            cells.append(entries[i].ljust(col_width))
    print("  ".join(cells).rstrip())