Move rename detection into new file

This improves the naming for the rename related functionality
moving it to be called `git_diff_find_similar()` and renaming
all the associated constants, etc. to make more sense.

I also moved the new code (plus the existing `git_diff_merge`)
into a new file `diff_tform.c` where I can put new functions
related to manipulating git diff lists.

This also updates the implementation significantly from the
last revision fixing some ordering issues (where break-rewrite
needs to be handled prior to copy and rename detection) and
improving config option handling.

1 files changed, 30 insertions, 0 deletions

diff --git a/src/vector.c b/src/vector.c
index c6a644cc3..e56b97849 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -241,3 +241,33 @@ void git_vector_swap(git_vector *a, git_vector *b)
 	memcpy(a, b, sizeof(t));
 	memcpy(b, &t, sizeof(t));
 }
+
+int git_vector_resize_to(git_vector *v, size_t new_length)
+{
+	if (new_length <= v->length)
+		return 0;
+
+	while (new_length >= v->_alloc_size)
+		if (resize_vector(v) < 0)
+			return -1;
+
+	memset(&v->contents[v->length], 0,
+		sizeof(void *) * (new_length - v->length));
+
+	v->length = new_length;
+
+	return 0;
+}
+
+int git_vector_set(void **old, git_vector *v, size_t position, void *value)
+{
+	if (git_vector_resize_to(v, position + 1) < 0)
+		return -1;
+
+	if (old != NULL)
+		*old = v->contents[position];
+
+	v->contents[position] = value;
+
+	return 0;
+}