ansi-project.py

xterm_colors = [
    # colors 0..15: 16 basic colors
    (0x00, 0x00, 0x00),  # 0
    (0xCD, 0x00, 0x00),  # 1
    (0x00, 0xCD, 0x00),  # 2
    (0xCD, 0xCD, 0x00),  # 3
    (0x00, 0x00, 0xEE),  # 4
    (0xCD, 0x00, 0xCD),  # 5
    (0x00, 0xCD, 0xCD),  # 6
    (0xE5, 0xE5, 0xE5),  # 7
]


names = [
    "black",
    "red",
    "green",
    "yellow",
    "blue",
    "magenta",
    "cyan",
    "white",
]


def closest_color(r, g, b):
    distance = 257 * 257 * 3  # "infinity" (>distance from #000000 to #ffffff)
    match = 0

    for i, values in enumerate(xterm_colors):
        rd = r - values[0]
        gd = g - values[1]
        bd = b - values[2]
        d = rd * rd + gd * gd + bd * bd

        if d < distance:
            match = i
            distance = d
    return match


for name, (r, g, b) in zip(names, xterm_colors):
    print(f"--ansi-{name}: rgb({r}, {g}, {b});")
    print(f"--ansi-bright-{name}: var(--ansi-{name});")

i = 16
for red in range(0, 6):
    for green in range(0, 6):
        for blue in range(0, 6):
            code = 16 + (red * 36) + (green * 6) + blue
            r = red * 40 + 55 if red != 0 else 0
            g = green * 40 + 55 if green != 0 else 0
            b = blue * 40 + 55 if blue != 0 else 0

            j = closest_color(r, g, b)
            closest_name = names[j]
            print(f"--ansi-palette-{i}: var(--ansi-{closest_name});")
            i += 1

for gray in range(0, 24):
    level = gray * 10 + 8

    code = 232 + gray

    i = code
    j = closest_color(level, level, level)
    closest_name = names[j]
    print(f"--ansi-palette-{i}: var(--ansi-{closest_name});")