commit: add function to unparse a commit and its parents

This patch adds the "unparse_commit" function that returns a commit
into an unparsed state by freeing its data and resetting its fields
to 0.

Its parents are recursively unparsed too, because they might have
been changed. But its tree is not unparsed as it should not have
been modifed.

Note that as the "flags" and "used" fields may be used even if the
object is not parsed, we have to reset them anyway.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/commit.c b/commit.c
index aa3b35b6a86891ac9d0628e20a6a46d506bf7700..8f6b703c557599921d890c3b50b66eaa397de548 100644 (file)
--- a/commit.c
+++ b/commit.c
@@ -316,6 +316,26 @@ int parse_commit(struct commit *item)
        return ret;
 }
 
+static void unparse_commit_list(struct commit_list *list)
+{
+       for (; list; list = list->next)
+               unparse_commit(list->item);
+}
+
+void unparse_commit(struct commit *item)
+{
+       item->object.flags = 0;
+       item->object.used = 0;
+       if (item->object.parsed) {
+               item->object.parsed = 0;
+               if (item->parents) {
+                       unparse_commit_list(item->parents);
+                       free_commit_list(item->parents);
+                       item->parents = NULL;
+               }
+       }
+}
+
 struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
 {
        struct commit_list *new_list = xmalloc(sizeof(struct commit_list));

diff --git a/commit.h b/commit.h
index ba9f63813eba004ae409eba8741266a074161239..f3eaf1d048a3e799eb571fbfe1302c08b3d394a6 100644 (file)
--- a/commit.h
+++ b/commit.h
@@ -40,6 +40,8 @@ int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size);
 
 int parse_commit(struct commit *item);
 
+void unparse_commit(struct commit *item);
+
 struct commit_list * commit_list_insert(struct commit *item, struct commit_list **list_p);
 unsigned commit_list_count(const struct commit_list *l);
 struct commit_list * insert_by_date(struct commit *item, struct commit_list **list);