fontfilter.py

#!/usr/bin/python2
import sys, fontforge, string

allowed_chars = string.printable # ascii (32 -> 126)

if len(sys.argv) == 3:
	font = fontforge.open(sys.argv[1])

	for char in allowed_chars.decode("UTF-8"):
		font.selection[ord(char)] = True

	font.selection.invert()

	for glyph in font.selection.byGlyphs:
		font.removeGlyph(glyph)

	font.generate(sys.argv[2])
else:
	print "Usage: {} [input.ttf] [output.ttf]".format(sys.argv[0])