Generate a XBM image from an ASCII art string

asciitoxbm.py

def ascii_to_xbm(string, black='#', white=' '):
    """Generate a XBM image from an ascii art string"""

    # purify input by removing all empty lines
    # and all lines that contains illegal characters
    lines = []
    for line in string.split('\n'):
        if not line:
            continue
        if not all([c in (black, white) for c in line]):
            continue
        lines.append(line)

    width = len(max(lines, key=len))
    height = len(lines)

    # fill incomplete lines with spaces
    lines = map(lambda l: l.ljust(width, white), lines)
    lines = "".join(lines)

    databytes = []
    for chunk in chunks(lines, 8):
        byte = 0x00
        for i, char in enumerate(chunk, start=0):
            if char == black:
                byte += 2 ** i
        databytes.append(format(byte, '#04x'))

    result = """
    #define im_width {0}
    #define im_height {1}
    static char im_bits[] = {{\n{2}\n}};
    """
    return result.format(width, height, ",".join(databytes))


def chunks(string, size):
    """Cut a string in chunks of the given size"""
    return [string[i:i + size] for i in range(0, len(string), size)]


pixels = """
################################
#                              #
#                              #
#                              #
#               #
#                              #
#                              #
#                              #
#                       #   
#                              #
#                              #
#                              #
#                              #
#   ##### #####  #### #####    #
#     #   #     #       #      #
#     #   ###    ###    #      #
#     #   #         #   #      #
#     #   ##### ####    #      #
#                              #
#                              #
#                              #
#              
#                              #
#                              #
#                              #
#                              #
#                     
#                              #
#                              #
#                              #
#                              #
#################
"""

print(ascii_to_xbm(pixels))