Check glyph names

#MenuTitle: Check glyph names
# encoding: utf-8
"""Goes through all glyph names and looks for illegal characters."""

import GlyphsApp

Font = Glyphs.font
firstChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
restChars = "0123456789._-"
legalChars = firstChars + restChars

def process( thisName ):
    thisFirstChar = thisName[0]

    if thisFirstChar not in firstChars and thisName not in [".notdef", ".null"]:
        if thisFirstChar in restChars:
            print "'%s': potentially problematic first character" % thisName
        else:
            print "'%s': illegal first character" % thisName

    for thisChar in thisName[1:]:
        if thisChar not in legalChars:
            print "'%s': illegal character '%s'" % ( thisName, thisChar )

for thisGlyph in Font.glyphs:
    process( thisGlyph.name.replace("\U","\u").decode('unicode-escape') )