#Needs: fonts/DirectionTest.sfd

import sys, fontforge

font=fontforge.open(sys.argv[1])
font.selection.all()
font.selection.select(("less",),"K")

dir=True
for g in font.selection.byGlyphs :
  c = g.foreground[0]
  if dir != c.isClockwise():
    raise ValueError("Wrong direction")
  dir = not dir

c = font["K"].foreground[0]
if c.isClockwise()!=-1:
  raise ValueError("Found a direction")