[StGIT PATCH 3/4] Don't traverse the whole DAG when looking for uninteresting commits

["Karl Hasselström" <kha@treskal.com>]

It's sufficient to look at the part of the DAG that's reachable from
the patches. This might be a large subset, of course, but it could
still be a significant improvement in some cases, especially when
there is only one patch.

Signed-off-by: Karl Hasselström <kha@treskal.com>

---

 stgit/stack.py |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/stgit/stack.py b/stgit/stack.py
index 8f1c0ee..dbb27eb 100644
--- a/stgit/stack.py
+++ b/stgit/stack.py
@@ -459,7 +459,8 @@ class UninterestingCache:
         # Iterate over all commits. We are guaranteed to see each
         # commit before any of its children.
         for line in git._output_lines(
-            'git-rev-list --topo-order --reverse --parents --all'):
+            'git-rev-list --topo-order --reverse --parents --stdin',
+            ['%s\n' % p for p in patches]):
             commits = line.split()
             commit, parents = commits[0], Set(commits[1:])