Blame support for files

This also includes a diff package and revlist package (needed by
blame)

Some extra packfiles (<1MB) are also included, to be used as fixtures in
the tests.

1 files changed, 5 insertions, 0 deletions

diff --git a/commit.go b/commit.go
index 1440403..afd67ab 100644
--- a/commit.go
+++ b/commit.go
@@ -45,6 +45,11 @@ func (c *Commit) Parents() *CommitIter {
 	return i
 }
 
+// NumParents returns the number of parents in a commit.
+func (c *Commit) NumParents() int {
+	return len(c.parents)
+}
+
 // Decode transform an core.Object into a Blob struct
 func (c *Commit) Decode(o core.Object) error {
 	c.Hash = o.Hash()