something about the LaTeX listings package and OpenType ligatures

ligs.py

import sys

def esc(txt):
    left = txt
    right = txt
    chrs = r'\~^'
    for chr in chrs:
        right = right.replace(chr, '\\char"' + format(ord(chr), 'X'))
    left = left.replace('\\', '\\\\')
    chrs = r'$&%#{}_'
    for chr in chrs:
         right = right.replace(chr, '\\' + chr)
         left = left.replace(chr, '\\' + chr)
    return left, right

def main2():
    sys.stdout.reconfigure(encoding='utf-8')
    with open('ligs.txt', encoding='utf-8') as f:
        for l in sorted(map(str.strip, f.readlines()), key=len):
            length = len(l)
            l, r = esc(l)
            print(f'{{{l}}}{{{{\\hbox{{{r}}}}}}}{length}')

def main():
    sys.stdout.reconfigure(encoding='utf-8')
    with open('ligs2.txt', encoding='utf-8') as f:
        # sorted pairs
        for seq, cp in sorted(map(str.split, f.readlines()),
                key=lambda p: len(p[0])):
            length = len(seq)
            slen = str(length)
            seq, _ = esc(seq)
            cp = int(cp, 16)
            print('{' + seq + '}'
                    + '{\\makebox[' + slen + '\\pprochar][r]'
                    + '{\\char"' + format(cp, 'X') + '}}'
                    + slen)

if __name__ == '__main__':
    main()