/*
* Inspect two trees, and give a score that tells how similar they are.
*/
static int score_trees(const unsigned char *hash1, const unsigned char *hash2)
{
struct tree_desc one;
struct tree_desc two;
void *one_buf = fill_tree_desc_strict(&one, hash1);
void *two_buf = fill_tree_desc_strict(&two, hash2);
int score = 0;
for (;;) {
struct name_entry e1, e2;
int got_entry_from_one = tree_entry(&one, &e1);
int got_entry_from_two = tree_entry(&two, &e2);
int cmp;
if (got_entry_from_one && got_entry_from_two)
cmp = base_name_entries_compare(&e1, &e2);
else if (got_entry_from_one)
/* two lacks this entry */
cmp = -1;
else if (got_entry_from_two)
/* two has more entries */
cmp = 1;
else
break;
if (cmp < 0)
/* path1 does not appear in two */
score += score_missing(e1.mode, e1.path);
else if (cmp > 0)
/* path2 does not appear in one */
score += score_missing(e2.mode, e2.path);
else if (hashcmp(e1.sha1, e2.sha1))
/* they are different */
score += score_differs(e1.mode, e2.mode, e1.path);
else
/* same subtree or blob */
score += score_matches(e1.mode, e2.mode, e1.path);
}
free(one_buf);
free(two_buf);
return score;
}
/*
* Inspect two trees, and give a score that tells how similar they are.
*/
static int score_trees(const unsigned char *hash1, const unsigned char *hash2)
{
struct tree_desc one;
struct tree_desc two;
void *one_buf, *two_buf;
int score = 0;
enum object_type type;
unsigned long size;
one_buf = read_sha1_file(hash1, &type, &size);
if (!one_buf)
die("unable to read tree (%s)", sha1_to_hex(hash1));
if (type != OBJ_TREE)
die("%s is not a tree", sha1_to_hex(hash1));
init_tree_desc(&one, one_buf, size);
two_buf = read_sha1_file(hash2, &type, &size);
if (!two_buf)
die("unable to read tree (%s)", sha1_to_hex(hash2));
if (type != OBJ_TREE)
die("%s is not a tree", sha1_to_hex(hash2));
init_tree_desc(&two, two_buf, size);
while (one.size | two.size) {
const unsigned char *elem1 = elem1;
const unsigned char *elem2 = elem2;
const char *path1 = path1;
const char *path2 = path2;
unsigned mode1 = mode1;
unsigned mode2 = mode2;
int cmp;
if (one.size)
elem1 = tree_entry_extract(&one, &path1, &mode1);
if (two.size)
elem2 = tree_entry_extract(&two, &path2, &mode2);
if (!one.size) {
/* two has more entries */
score += score_missing(mode2, path2);
update_tree_entry(&two);
continue;
}
if (!two.size) {
/* two lacks this entry */
score += score_missing(mode1, path1);
update_tree_entry(&one);
continue;
}
cmp = base_name_compare(path1, strlen(path1), mode1,
path2, strlen(path2), mode2);
if (cmp < 0) {
/* path1 does not appear in two */
score += score_missing(mode1, path1);
update_tree_entry(&one);
continue;
}
else if (cmp > 0) {
/* path2 does not appear in one */
score += score_missing(mode2, path2);
update_tree_entry(&two);
continue;
}
else if (hashcmp(elem1, elem2))
/* they are different */
score += score_differs(mode1, mode2, path1);
else
/* same subtree or blob */
score += score_matches(mode1, mode2, path1);
update_tree_entry(&one);
update_tree_entry(&two);
}
free(one_buf);
free(two_buf);
return score;
}