diff options
| -rw-r--r-- | builtin/name-rev.c | 59 | ||||
| -rwxr-xr-x | t/t4202-log.sh | 2 |
2 files changed, 53 insertions, 8 deletions
diff --git a/builtin/name-rev.c b/builtin/name-rev.c index b7afffef73..663e26ebbd 100644 --- a/builtin/name-rev.c +++ b/builtin/name-rev.c @@ -13,6 +13,7 @@ typedef struct rev_name { timestamp_t taggerdate; int generation; int distance; + int from_tag; } rev_name; static long cutoff = LONG_MAX; @@ -20,9 +21,47 @@ static long cutoff = LONG_MAX; /* How many generations are maximally preferred over _one_ merge traversal? */ #define MERGE_TRAVERSAL_WEIGHT 65535 +static int is_better_name(struct rev_name *name, + const char *tip_name, + timestamp_t taggerdate, + int generation, + int distance, + int from_tag) +{ + /* + * When comparing names based on tags, prefer names + * based on the older tag, even if it is farther away. + */ + if (from_tag && name->from_tag) + return (name->taggerdate > taggerdate || + (name->taggerdate == taggerdate && + name->distance > distance)); + + /* + * We know that at least one of them is a non-tag at this point. + * favor a tag over a non-tag. + */ + if (name->from_tag != from_tag) + return from_tag; + + /* + * We are now looking at two non-tags. Tiebreak to favor + * shorter hops. + */ + if (name->distance != distance) + return name->distance > distance; + + /* ... or tiebreak to favor older date */ + if (name->taggerdate != taggerdate) + return name->taggerdate > taggerdate; + + /* keep the current one if we cannot decide */ + return 0; +} + static void name_rev(struct commit *commit, const char *tip_name, timestamp_t taggerdate, - int generation, int distance, + int generation, int distance, int from_tag, int deref) { struct rev_name *name = (struct rev_name *)commit->util; @@ -46,14 +85,14 @@ static void name_rev(struct commit *commit, name = xmalloc(sizeof(rev_name)); commit->util = name; goto copy_data; - } else if (name->taggerdate > taggerdate || - (name->taggerdate == taggerdate && - name->distance > distance)) { + } else if (is_better_name(name, tip_name, taggerdate, + generation, distance, from_tag)) { copy_data: name->tip_name = tip_name; name->taggerdate = taggerdate; name->generation = generation; name->distance = distance; + name->from_tag = from_tag; } else { free(to_free); return; @@ -75,10 +114,12 @@ copy_data: parent_number); name_rev(parents->item, new_name, taggerdate, 0, - distance + MERGE_TRAVERSAL_WEIGHT, 0); + distance + MERGE_TRAVERSAL_WEIGHT, + from_tag, 0); } else { name_rev(parents->item, tip_name, taggerdate, - generation + 1, distance + 1, 0); + generation + 1, distance + 1, + from_tag, 0); } } } @@ -209,9 +250,13 @@ static int name_ref(const char *path, const struct object_id *oid, int flags, vo } if (o && o->type == OBJ_COMMIT) { struct commit *commit = (struct commit *)o; + int from_tag = starts_with(path, "refs/tags/"); + if (taggerdate == ULONG_MAX) + taggerdate = ((struct commit *)o)->date; path = name_ref_abbrev(path, can_abbreviate_output); - name_rev(commit, xstrdup(path), taggerdate, 0, 0, deref); + name_rev(commit, xstrdup(path), taggerdate, 0, 0, + from_tag, deref); } return 0; } diff --git a/t/t4202-log.sh b/t/t4202-log.sh index 1c7d6729c6..6499cdf6ff 100755 --- a/t/t4202-log.sh +++ b/t/t4202-log.sh @@ -399,7 +399,7 @@ cat > expect <<\EOF | | | | Merge branch 'side' | | -| * commit side +| * commit tags/side-2 | | Author: A U Thor <author@example.com> | | | | side-2 |