We really want to always favor an annotated tag over a lightweight
tag when describing a commit. Unfortunately git-describe wasn't
doing this as it was favoring the depth attribute of a possible_tag
over the priority. Now priority is the highest sort and we only
consider a lightweight tag if no annotated tags were identified.
Rather than searching for the minimum tag using a simple loop we
now sort them using a stable sort algorithm, this way the possible
tags display in order if --debug gets used. The stable sort helps
to preseve the inherit topology/date order that we obtain during
our search loop.
This fix allows the tests in t6120-describe.sh to pass.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
builtin-describe.c | 30 +++++++++++++++++++-----------
1 files changed, 19 insertions(+), 11 deletions(-)
diff --git a/builtin-describe.c b/builtin-describe.c
index 421658d..45fea10 100644
--- a/builtin-describe.c
+++ b/builtin-describe.c
@@ -22,6 +22,9 @@ static struct commit_name {
int prio; /* annotated tag = 2, tag = 1, head = 0 */
char path[FLEX_ARRAY]; /* more */
} **name_array[256];
+static const char *prio_names[] = {
+ "head", "lightweight", "annotated",
+};
static struct commit_name *match(struct commit *cmit)
{
@@ -122,6 +125,17 @@ struct possible_tag {
unsigned flag_within;
};
+static int compare_pt(const void *_a, const void *_b)
+{
+ struct possible_tag *a = (struct possible_tag *)_a;
+ struct possible_tag *b = (struct possible_tag *)_b;
+ if (a->name->prio != b->name->prio)
+ return b->name->prio - a->name->prio;
+ if (a->depth != b->depth)
+ return a->depth - b->depth;
+ return 0;
+}
+
static void describe(const char *arg, int last_one)
{
unsigned char sha1[20];
@@ -129,7 +143,7 @@ static void describe(const char *arg, int last_one)
struct commit_list *list;
static int initialized = 0;
struct commit_name *n;
- struct possible_tag all_matches[MAX_TAGS], *min_match;
+ struct possible_tag all_matches[MAX_TAGS];
unsigned int match_cnt = 0, annotated_cnt = 0, cur_match;
unsigned long seen_commits = 0;
@@ -205,18 +219,12 @@ static void describe(const char *arg, int last_one)
if (!match_cnt)
die("cannot describe '%s'", sha1_to_hex(cmit->object.sha1));
- min_match = &all_matches[0];
- for (cur_match = 1; cur_match < match_cnt; cur_match++) {
- struct possible_tag *t = &all_matches[cur_match];
- if (t->depth < min_match->depth
- && t->name->prio >= min_match->name->prio)
- min_match = t;
- }
+ mergesort(all_matches, match_cnt, sizeof(all_matches[0]), compare_pt);
if (debug) {
for (cur_match = 0; cur_match < match_cnt; cur_match++) {
struct possible_tag *t = &all_matches[cur_match];
- fprintf(stderr, " %c %8lu %s\n",
- min_match == t ? '*' : ' ',
+ fprintf(stderr, " %-11s %8lu %s\n",
+ prio_names[t->name->prio],
t->depth, t->name->path);
}
fprintf(stderr, "traversed %lu commits\n", seen_commits);
@@ -228,7 +236,7 @@ static void describe(const char *arg, int last_one)
sha1_to_hex(gave_up_on->object.sha1));
}
}
- printf("%s-g%s\n", min_match->name->path,
+ printf("%s-g%s\n", all_matches[0].name->path,
find_unique_abbrev(cmit->object.sha1, abbrev));
if (!last_one)
--
1.5.0.rc1.g4494
-
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