fixfont.py

#!/usr/bin/env python3

import argparse
import sys
import os
from fontTools.ttx import makeOutputFileName
from fontTools.ttLib import TTFont
from unidecode import unidecode

# WOFF name table IDs
FAMILY = 1
SUBFAMILY = 2
FULL_NAME = 4
POSTSCRIPT_NAME = 6
PREFERRED_FAMILY = 16
PREFERRED_SUBFAMILY = 17
WWS_FAMILY = 21
WWS_SUBFAMILY = 22

def main(args=None):
    parser = argparse.ArgumentParser()
    parser.add_argument("input")
    parser.add_argument("-f", "--family-name")
    parser.add_argument("-s", "--subfamily-name")
    parser.add_argument("-o", "--output")
    options = parser.parse_args()

    font = TTFont(options.input)
    
    if font.flavor not in ("woff2"):
        print("Input file is not a WOFF2 font", file=sys.stderr)
        return 1

    family, subfamily = extract_names(options.input, options.family_name, options.subfamily_name)
    full = "%s %s" % (family, subfamily)
    postscript = "%s-%s" % (postscriptify(family), postscriptify(subfamily))[:63]

    for rec in font["name"].names:
        if rec.nameID in [FAMILY, PREFERRED_FAMILY, WWS_FAMILY]:
            rec.string = family
        elif rec.nameID in [SUBFAMILY, PREFERRED_SUBFAMILY, WWS_SUBFAMILY]:
            rec.string = subfamily
        elif rec.nameID == FULL_NAME:
            rec.string = full
        elif rec.nameID == POSTSCRIPT_NAME:
            rec.string = postscript

    # Remove extended metadata and private data
    font.flavorData.metaData = None
    font.flavorData.privData = None

    if options.output:
        font.save(options.output)
    else:
        filename, ext = os.path.splitext(options.input)
        outfile = makeOutputFileName(filename, None, ext)
        font.save(outfile)
        print("Output saved in “%s”" % outfile)

def postscriptify(name):
    return "".join(char for char in unidecode(name) if 33 <= ord(char) <= 126 and char not in " [](){}<>/%")

def extract_names(file, family_name=None, subfamily_name=None):
    filename, _ = os.path.splitext(os.path.basename(file))

    if filename.count("-") == 1:
        family, subfamily = filename.split("-")
    elif filename.count(" ") == 1:
        family, subfamily = filename.split(" ")
    elif not family_name or not subfamily_name:
        print("Could not figure out names from “%s”" % filename, file=sys.stderr)
        sys.exit(1)

    return family_name or family, subfamily_name or subfamily

if __name__ == "__main__":
    sys.exit(main())