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#!/usr/bin/env python
__doc__ = '''Switch default language in a font'''
__url__ = 'http://github.com/silnrsi/pysilfont'
__copyright__ = 'Copyright (c) 2019 SIL International (http://www.sil.org)'
__license__ = 'Released under the MIT License (http://opensource.org/licenses/MIT)'
__author__ = 'Martin Hosken'
from silfont.core import execute
argspec = [
('ifont',{'help': 'Input TTF'}, {'type': 'infont'}),
('ofont',{'help': 'Output TTF','nargs': '?' }, {'type': 'outfont'}),
('-L','--lang', {'help': 'Language to switch to'}, {}),
('-l','--log',{'help': 'Optional log file'}, {'type': 'outfile', 'def': '_deflang.log', 'optlog': True}),
]
def long2tag(x):
res = []
while x:
res.append(chr(x & 0xFF))
x >>= 8
return "".join(reversed(res))
def doit(args):
infont = args.ifont
ltag = args.lang.lower()
if 'Sill' in infont and 'Feat' in infont:
if ltag in infont['Sill'].langs:
changes = dict((long2tag(x[0]), x[1]) for x in infont['Sill'].langs[ltag])
for g, f in infont['Feat'].features.items():
if g in changes:
f.default = changes[g]
otltag = ltag + (" " * (4 - len(ltag)))
for k in ('GSUB', 'GPOS'):
try:
t = infont[k].table
except KeyError:
continue
for srec in t.ScriptList.ScriptRecord:
for lrec in srec.Script.LangSysRecord:
if lrec.LangSysTag.lower() == otltag:
srec.Script.DefaultLangSys = lrec.LangSys
return infont
def cmd() : execute('FT', doit, argspec)
if __name__ == "__main__" : cmd()
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