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Merge branch 'jk/no-more-self-assignment'

Browse source 
This started as a topic to reduce "type var = var" self assignment
tricks that were used to squelch "variable used uninitialized perhaps?"
warning from some compilers, but resulted in rewriting logic with
a version that is simpler and easier to understand for humans.

* jk/no-more-self-assignment:
  match-trees: simplify score_trees() using tree_entry()
  submodule: clarify logic in show_submodule_summary
This commit is contained in:
Junio C Hamano 2013-04-02 15:09:35 -07:00
commit 5fb7b899fb
2 changed files with 34 additions and 47 deletions
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68
match-trees.c
View file

@ -47,6 +47,13 @@ static int score_matches(unsigned mode1, unsigned mode2, const char *path)
return score;
}
static int base_name_entries_compare(const struct name_entry *a,
const struct name_entry *b)
{
return base_name_compare(a->path, tree_entry_len(a), a->mode,
b->path, tree_entry_len(b), b->mode);
}
/*
* Inspect two trees, and give a score that tells how similar they are.
*/
@ -71,54 +78,35 @@ static int score_trees(const unsigned char *hash1, const unsigned char *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;
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 (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) {
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 */
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) {
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(mode1, path1);
update_tree_entry(&one);
continue;
}
else if (cmp > 0) {
score += score_missing(e1.mode, e1.path);
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))
score += score_missing(e2.mode, e2.path);
else if (hashcmp(e1.sha1, e2.sha1))
/* they are different */
score += score_differs(mode1, mode2, path1);
score += score_differs(e1.mode, e2.mode, e1.path);
else
/* same subtree or blob */
score += score_matches(mode1, mode2, path1);
update_tree_entry(&one);
update_tree_entry(&two);
score += score_matches(e1.mode, e2.mode, e1.path);
}
free(one_buf);
free(two_buf);

13
submodule.c
View file

@ -261,7 +261,7 @@ void show_submodule_summary(FILE *f, const char *path,
const char *del, const char *add, const char *reset)
{
struct rev_info rev;
struct commit *left = left, *right = right;
struct commit *left = NULL, *right = NULL;
const char *message = NULL;
struct strbuf sb = STRBUF_INIT;
int fast_forward = 0, fast_backward = 0;
@ -275,10 +275,8 @@ void show_submodule_summary(FILE *f, const char *path,
else if (!(left = lookup_commit_reference(one)) ||
!(right = lookup_commit_reference(two)))
message = "(commits not present)";
if (!message &&
prepare_submodule_summary(&rev, path, left, right,
&fast_forward, &fast_backward))
else if (prepare_submodule_summary(&rev, path, left, right,
&fast_forward, &fast_backward))
message = "(revision walker failed)";
if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
@ -302,11 +300,12 @@ void show_submodule_summary(FILE *f, const char *path,
strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
fwrite(sb.buf, sb.len, 1, f);
if (!message) {
if (!message) /* only NULL if we succeeded in setting up the walk */
print_submodule_summary(&rev, f, del, add, reset);
if (left)
clear_commit_marks(left, ~0);
if (right)
clear_commit_marks(right, ~0);
}
strbuf_release(&sb);
}