python script for fixing TTF font height

fonttools.py

import os
import sys

from fontTools import ttLib

def run(argv):
    if len(argv) != 2:
        print("USAGE: %s <font-file>" % argv[0])
        sys.exit(1)

    fontpath = argv[1]
    tt = ttLib.TTFont(fontpath)
    shift_down = 100
    extra_ascent = 100
    tt['hhea'].ascent += shift_down + extra_ascent
    tt['hhea'].descent += shift_down
    tt['hhea'].lineGap = 0
    tt.save(get_nolinegap_filepath(fontpath))

def get_nolinegap_filepath(fontpath):
    fontpath_list = os.path.split(fontpath)
    font_dirname = fontpath_list[0]
    font_basename = fontpath_list[1]
    basepath_list = font_basename.split(".")
    outfile_basename = basepath_list[0] + "-nolinegap." + basepath_list[1]
    return os.path.join(font_dirname, outfile_basename)

if __name__ == '__main__':
    run(sys.argv)