diff options
Diffstat (limited to 'builtin')
| -rw-r--r-- | builtin/blame.c | 42 |
1 files changed, 40 insertions, 2 deletions
diff --git a/builtin/blame.c b/builtin/blame.c index da44b36ff5..4ddfadb71f 100644 --- a/builtin/blame.c +++ b/builtin/blame.c @@ -2456,6 +2456,41 @@ static char *prepare_final(struct scoreboard *sb) return xstrdup_or_null(name); } +static const char *dwim_reverse_initial(struct scoreboard *sb) +{ + /* + * DWIM "git blame --reverse ONE -- PATH" as + * "git blame --reverse ONE..HEAD -- PATH" but only do so + * when it makes sense. + */ + struct object *obj; + struct commit *head_commit; + unsigned char head_sha1[20]; + + if (sb->revs->pending.nr != 1) + return NULL; + + /* Is that sole rev a committish? */ + obj = sb->revs->pending.objects[0].item; + obj = deref_tag(obj, NULL, 0); + if (obj->type != OBJ_COMMIT) + return NULL; + + /* Do we have HEAD? */ + if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, head_sha1, NULL)) + return NULL; + head_commit = lookup_commit_reference_gently(head_sha1, 1); + if (!head_commit) + return NULL; + + /* Turn "ONE" into "ONE..HEAD" then */ + obj->flags |= UNINTERESTING; + add_pending_object(sb->revs, &head_commit->object, "HEAD"); + + sb->final = (struct commit *)obj; + return sb->revs->pending.objects[0].name; +} + static char *prepare_initial(struct scoreboard *sb) { int i; @@ -2474,14 +2509,17 @@ static char *prepare_initial(struct scoreboard *sb) if (obj->type != OBJ_COMMIT) die("Non commit %s?", revs->pending.objects[i].name); if (sb->final) - die("More than one commit to dig down to %s and %s?", + die("More than one commit to dig up from, %s and %s?", revs->pending.objects[i].name, final_commit_name); sb->final = (struct commit *) obj; final_commit_name = revs->pending.objects[i].name; } + + if (!final_commit_name) + final_commit_name = dwim_reverse_initial(sb); if (!final_commit_name) - die("No commit to dig down to?"); + die("No commit to dig up from?"); return xstrdup(final_commit_name); } |