IPAGothicのcurved quote (U+2018, U+2019, U+201C, U+201D)の幅を半角にする

narrow-quotation-width-in-ipagothic.py

import fontforge
import os
import psMat
import shutil
import sys

def narrow_quotation_width(path):
    f = fontforge.open(path)

    # left quotation marks
    for c in (0x2018, 0x201C):
        g = f[c]
        if g.width == 1000:
            g.transform(psMat.translate(-500, 0))

    # right quotation marks
    for c in (0x2019, 0x201D):
        g = f[c]
        if g.width == 1000:
            g.width = 500

    f.save(path)

if __name__ == '__main__':
    if len(sys.argv) < 2:
        sys.exit('Usage: %s [font_file]...' % sys.argv[0])

    for path in sys.argv[1:]:
        dst = path + '.orig'
        print('Copy: %s -> %s' % (path, dst))
        shutil.copy(path, dst)

        print('Modify: %s' % path)
        narrow_quotation_width(path)