Initial implementation of an elasticsearch indexer in Go

Closes #1 (closed)

git/go-git.go

@@ -38,7 +38,7 @@ func NewGoGitRepository(projectPath string, fromSHA string, toSHA string) (*goGi
 	} else {
 		out.FromHash = plumbing.NewHash(fromSHA)
-		commit, err := out.Repository.CommitObject(out.FromHash)
+		commit, err := repo.CommitObject(out.FromHash)
 		if err != nil {
 			return nil, fmt.Errorf("Bad from SHA (%s): %s", out.FromHash, err)
 		}
@@ -149,10 +149,15 @@ func (r *goGitRepository) EachFileChange(ins, mod, del FileFunc) error {
 	return nil
 }
-// EachCommit runs `f` for each commit within `fromSHA`...`toSHA` (i.e., the
-// inclusive set).
+// EachCommit runs `f` for each commit within `fromSHA`..`toSHA`
+// go-git doesn't directly support ranges of revisions, so we emulate this by
+// walking the commit history between from and to
 func (r *goGitRepository) EachCommit(f CommitFunc) error {
-	err := object.WalkCommitHistory(r.ToCommit, func(c *object.Commit) error {
+	err := object.WalkCommitHistoryPost(r.ToCommit, func(c *object.Commit) error {
+		if r.FromCommit != nil && c.ID() == r.FromCommit.ID() {
+				return endError
+			}
+		}
 		commit := &Commit{
 			Message:   c.Message,
@@ -164,10 +169,6 @@ func (r *goGitRepository) EachCommit(f CommitFunc) error {
 			return err
 		}
-		if r.FromCommit != nil && c.ID() == r.FromCommit.ID() {
-			return endError
-		}
-
 		return nil
 	})