[PATCH 1/5] add 'prior' link in commit structure

[Sam Vilain <sam.vilain@catalyst.net.nz>]

From: Sam Vilain <sam.vilain@catalyst.net.nz>

Add a space in the commit for a prior commit that forms this commit's
historical, not substantial, precedent.

For now this is just recorded as a char* pointer, as it is not an
error condition for the commit not to be present locally.
---

 commit.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/commit.h b/commit.h
index de142af..b00a6b9 100644
--- a/commit.h
+++ b/commit.h
@@ -13,6 +13,7 @@ struct commit {
 	struct object object;
 	unsigned long date;
 	struct commit_list *parents;
+	char *prior;
 	struct tree *tree;
 	char *buffer;
 };