move oneline() to gitutils.py

It has nothing to do with DependencyDetector, and this will let us
reuse it from git-explode too.

1 files changed, 4 insertions, 0 deletions

diff --git a/git_deps/gitutils.py b/git_deps/gitutils.py
index f5d8281..ce80ad5 100644
--- a/git_deps/gitutils.py
+++ b/git_deps/gitutils.py
@@ -49,6 +49,10 @@ class GitUtils(object):
         return out
 
     @classmethod
+    def oneline(cls, commit):
+        return commit.message.split('\n', 1)[0]
+
+    @classmethod
     def refs_to(cls, sha1, repo):
         """Returns all refs pointing to the given SHA1."""
         matching = []