add start of hostmask matching: mask collapsing

test/__init__.py

@@ -0,0 +1 @@
+from .glob import *

test/glob.py

@@ -0,0 +1,16 @@
+import unittest
+from ircrobots import glob
+
+class GlobTestCollapse(unittest.TestCase):
+    def test(self):
+        c1 = glob._collapse("**?*")
+        self.assertEqual(c1, "?*")
+
+        c2 = glob._collapse("a**?a*")
+        self.assertEqual(c2, "a?*a*")
+
+        c3 = glob._collapse("?*?*?*?*a")
+        self.assertEqual(c3, "????*a")
+
+        c4 = glob._collapse("a*?*a?**")
+        self.assertEqual(c4, "a?*a?*")