[feaLib] Make include() work like makeotf

Lib/fontTools/feaLib/lexer.py

@@ -188,6 +188,7 @@ class Lexer(object):
 class IncludingLexer(object):
     def __init__(self, featurefile):
         self.lexers_ = [self.make_lexer_(featurefile)]
+        self.featurefilepath = self.lexers_[0].filename_
 
     def __iter__(self):
         return self
@@ -210,7 +211,7 @@ class IncludingLexer(object):
                 #semi_type, semi_token, semi_location = lexer.next()
                 #if semi_type is not Lexer.SYMBOL or semi_token != ";":
                 #    raise FeatureLibError("Expected ';'", semi_location)
-                curpath = os.path.dirname(lexer.filename_)
+                curpath = os.path.dirname(self.featurefilepath)
                 path = os.path.join(curpath, fname_token)
                 if len(self.lexers_) >= 5:
                     raise FeatureLibError("Too many recursive includes",

Tests/feaLib/data/include1.fea

@@ -1,3 +1,3 @@
 I1a
-include(include0.fea)
+include(../include0.fea)
 I1b

Tests/feaLib/data/include3.fea

@@ -1,4 +1,4 @@
 I3a
-include(include2.fea);
+include(inc/include2.fea);
 I3b