From ec7afc5cbfba48bdd2f279ba25a7ebdfd0dcef78 Mon Sep 17 00:00:00 2001
From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Sat, 15 Nov 2014 23:35:40 -0500
Subject: cleanup

---
 alembic/revision.py    | 26 +++++++++-----------------
 tests/test_revision.py | 17 +++++++++++++++++
 2 files changed, 26 insertions(+), 17 deletions(-)

diff --git a/alembic/revision.py b/alembic/revision.py
index b079927..885b53b 100644
--- a/alembic/revision.py
+++ b/alembic/revision.py
@@ -423,21 +423,15 @@ class RevisionMap(object):
         limit_to_lower_branch = \
             isinstance(lower, compat.string_types) and '@' in lower
 
-        # TODO: rework the conditionals here to be easier
-        # to follow
-        if not limit_to_lower_branch or not requested_lowers:
-            if not requested_lowers and limit_to_lower_branch:
-                base_lowers = self.get_revisions(
-                    self._get_base_revisions(lower))
-                lowers = base_lowers
-            elif implicit_base or not requested_lowers:
-                base_lowers = set(self.get_revisions(self.bases))
-                base_lowers.difference_update(
-                    self._get_ancestor_nodes(requested_lowers))
-                lowers = base_lowers.union(requested_lowers)
-            else:
-                base_lowers = set()
-                lowers = requested_lowers
+        if limit_to_lower_branch:
+            base_lowers = self.get_revisions(
+                self._get_base_revisions(lower))
+            lowers = base_lowers
+        elif implicit_base or not requested_lowers:
+            base_lowers = set(self.get_revisions(self.bases))
+            base_lowers.difference_update(
+                self._get_ancestor_nodes(requested_lowers))
+            lowers = base_lowers.union(requested_lowers)
         else:
             base_lowers = set()
             lowers = requested_lowers
@@ -487,8 +481,6 @@ class RevisionMap(object):
 
             if not inclusive and rev in requested_lowers:
                 continue
-            #if rev in base_lowers
-            #if inclusive or rev not in lowers:
             yield rev
 
 
diff --git a/tests/test_revision.py b/tests/test_revision.py
index 6dde218..53fb730 100644
--- a/tests/test_revision.py
+++ b/tests/test_revision.py
@@ -155,6 +155,17 @@ class NamedBranchTest(DownIterateTest):
             ['c', 'somelongername', 'b', 'a']
         )
 
+    def test_iterate_named_head_to_base(self):
+        self._assert_iteration(
+            "ebranch@head", "base",
+            ['f', 'someothername', 'e', 'd']
+        )
+
+        self._assert_iteration(
+            "abranch@head", "base",
+            ['c', 'somelongername', 'b', 'a']
+        )
+
     def test_iterate_head_to_version_specific_base(self):
         self._assert_iteration(
             "heads", "e@base",
@@ -166,6 +177,12 @@ class NamedBranchTest(DownIterateTest):
             ['c', 'somelongername', 'b', 'a']
         )
 
+    def test_iterate_to_branch_at_rev(self):
+        self._assert_iteration(
+            "heads", "ebranch@d",
+            ['f', 'someothername', 'e', 'd']
+        )
+
     def test_partial_id_resolve(self):
         eq_(self.map.get_revision("ebranch@some").revision, "someothername")
         eq_(self.map.get_revision("abranch@some").revision, "somelongername")
-- 
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