1 files changed, 47 insertions, 0 deletions
diff --git a/lib/silfont/scripts/psfdeflang.py b/lib/silfont/scripts/psfdeflang.py
new file mode 100755
index 0000000..3a1ac26
--- /dev/null
+++ b/lib/silfont/scripts/psfdeflang.py
@@ -0,0 +1,47 @@
+#!/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()
+