Change get_source() api as per code review, to source_reset().

This now takes no flags, as a non-reset source access can be done
simply on the .source attribute.

IPython/core/blockbreaker.py

@@ -128,17 +128,11 b' class BlockBreaker(object):'
         self.source = ''
         self.code = None
 
-    def get_source(self, reset=False):
-        """Return the input source.
-
-        Parameters
-        ----------
-        reset : boolean
-          If true, all state is reset and prior input forgotten.
+    def source_reset(self):
+        """Return the input source and perform a full reset.
         """
         out = self.source
-        if reset:
-            self.reset()
+        self.reset()
         return out
 
     def push(self, lines):

IPython/core/tests/test_blockbreaker.py

@@ -72,19 +72,17 b' class BlockBreakerTestCase(unittest.TestCase):'
         bb.reset()
         self.assertEqual(bb._buffer, [])
         self.assertEqual(bb.indent_spaces, 0)
-        self.assertEqual(bb.get_source(), '')
+        self.assertEqual(bb.source, '')
         self.assertEqual(bb.code, None)
 
     def test_source(self):
         self.bb._store('1')
         self.bb._store('2')
-        out = self.bb.get_source()
-        self.assertEqual(out, '1\n2\n')
-        out = self.bb.get_source(reset=True)
-        self.assertEqual(out, '1\n2\n')
+        self.assertEqual(self.bb.source, '1\n2\n')
+        self.assertTrue(len(self.bb._buffer)>0)
+        self.assertEqual(self.bb.source_reset(), '1\n2\n')
         self.assertEqual(self.bb._buffer, [])
-        out = self.bb.get_source()
-        self.assertEqual(out, '')
+        self.assertEqual(self.bb.source, '')
         
     def test_indent(self):
         bb = self.bb # shorthand