Support non-http schemas in url refs

These url schemes were already valid for inline linking. This adds
the ability to use them as url references as well.

tests/test_getRefs.py

@@ -9,3 +9,13 @@ def test_getRefs():
     result = t.urlrefs
     expect = {'Google': 'http://www.google.com'}
     assert result == expect
+
+    t2 = Textile()
+
+    result = t2.getRefs("my ftp [ftp]ftp://example.com")
+    expect = 'my ftp '
+    assert result == expect
+
+    result = t2.urlrefs
+    expect = {'ftp': 'ftp://example.com'}
+    assert result == expect

textile/core.py

@@ -612,8 +612,14 @@ def glyphs(self, text):
 
     def getRefs(self, text):
         """Capture and store URL references in self.urlrefs."""
-        pattern = re.compile(r'(?:(?<=^)|(?<=\s))\[(.+)\]((?:http(?:s?):\/\/|\/)\S+)(?=\s|$)',
-                             re.U)
+        all_schemes = '|'.join([
+            '(?:{0})'.format(scheme)
+            for scheme in self.url_schemes
+        ])
+        pattern = re.compile(
+            r'(?:(?<=^)|(?<=\s))\[(.+)\]((?:{0}:\/\/|\/)\S+)(?=\s|$)'.format(all_schemes),
+            re.U
+        )
         text = pattern.sub(self.refs, text)
         return text