diff options
Diffstat (limited to 'third_party/git/builtin/name-rev.c')
| -rw-r--r-- | third_party/git/builtin/name-rev.c | 636 |
1 files changed, 0 insertions, 636 deletions
diff --git a/third_party/git/builtin/name-rev.c b/third_party/git/builtin/name-rev.c deleted file mode 100644 index 725dd0451913..000000000000 --- a/third_party/git/builtin/name-rev.c +++ /dev/null @@ -1,636 +0,0 @@ -#include "builtin.h" -#include "cache.h" -#include "repository.h" -#include "config.h" -#include "commit.h" -#include "tag.h" -#include "refs.h" -#include "parse-options.h" -#include "prio-queue.h" -#include "sha1-lookup.h" -#include "commit-slab.h" - -/* - * One day. See the 'name a rev shortly after epoch' test in t6120 when - * changing this value - */ -#define CUTOFF_DATE_SLOP 86400 - -struct rev_name { - char *tip_name; - timestamp_t taggerdate; - int generation; - int distance; - int from_tag; -}; - -define_commit_slab(commit_rev_name, struct rev_name); - -static timestamp_t cutoff = TIME_MAX; -static struct commit_rev_name rev_names; - -/* How many generations are maximally preferred over _one_ merge traversal? */ -#define MERGE_TRAVERSAL_WEIGHT 65535 - -static int is_valid_rev_name(const struct rev_name *name) -{ - return name && (name->generation || name->tip_name); -} - -static struct rev_name *get_commit_rev_name(const struct commit *commit) -{ - struct rev_name *name = commit_rev_name_peek(&rev_names, commit); - - return is_valid_rev_name(name) ? name : NULL; -} - -static int is_better_name(struct rev_name *name, - timestamp_t taggerdate, - 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 struct rev_name *create_or_update_name(struct commit *commit, - timestamp_t taggerdate, - int generation, int distance, - int from_tag) -{ - struct rev_name *name = commit_rev_name_at(&rev_names, commit); - - if (is_valid_rev_name(name)) { - if (!is_better_name(name, taggerdate, distance, from_tag)) - return NULL; - - /* - * This string might still be shared with ancestors - * (generation > 0). We can release it here regardless, - * because the new name that has just won will be better - * for them as well, so name_rev() will replace these - * stale pointers when it processes the parents. - */ - if (!name->generation) - free(name->tip_name); - } - - name->taggerdate = taggerdate; - name->generation = generation; - name->distance = distance; - name->from_tag = from_tag; - - return name; -} - -static char *get_parent_name(const struct rev_name *name, int parent_number) -{ - struct strbuf sb = STRBUF_INIT; - size_t len; - - strip_suffix(name->tip_name, "^0", &len); - if (name->generation > 0) { - strbuf_grow(&sb, len + - 1 + decimal_width(name->generation) + - 1 + decimal_width(parent_number)); - strbuf_addf(&sb, "%.*s~%d^%d", (int)len, name->tip_name, - name->generation, parent_number); - } else { - strbuf_grow(&sb, len + - 1 + decimal_width(parent_number)); - strbuf_addf(&sb, "%.*s^%d", (int)len, name->tip_name, - parent_number); - } - return strbuf_detach(&sb, NULL); -} - -static void name_rev(struct commit *start_commit, - const char *tip_name, timestamp_t taggerdate, - int from_tag, int deref) -{ - struct prio_queue queue; - struct commit *commit; - struct commit **parents_to_queue = NULL; - size_t parents_to_queue_nr, parents_to_queue_alloc = 0; - struct rev_name *start_name; - - parse_commit(start_commit); - if (start_commit->date < cutoff) - return; - - start_name = create_or_update_name(start_commit, taggerdate, 0, 0, - from_tag); - if (!start_name) - return; - if (deref) - start_name->tip_name = xstrfmt("%s^0", tip_name); - else - start_name->tip_name = xstrdup(tip_name); - - memset(&queue, 0, sizeof(queue)); /* Use the prio_queue as LIFO */ - prio_queue_put(&queue, start_commit); - - while ((commit = prio_queue_get(&queue))) { - struct rev_name *name = get_commit_rev_name(commit); - struct commit_list *parents; - int parent_number = 1; - - parents_to_queue_nr = 0; - - for (parents = commit->parents; - parents; - parents = parents->next, parent_number++) { - struct commit *parent = parents->item; - struct rev_name *parent_name; - int generation, distance; - - parse_commit(parent); - if (parent->date < cutoff) - continue; - - if (parent_number > 1) { - generation = 0; - distance = name->distance + MERGE_TRAVERSAL_WEIGHT; - } else { - generation = name->generation + 1; - distance = name->distance + 1; - } - - parent_name = create_or_update_name(parent, taggerdate, - generation, - distance, from_tag); - if (parent_name) { - if (parent_number > 1) - parent_name->tip_name = - get_parent_name(name, - parent_number); - else - parent_name->tip_name = name->tip_name; - ALLOC_GROW(parents_to_queue, - parents_to_queue_nr + 1, - parents_to_queue_alloc); - parents_to_queue[parents_to_queue_nr] = parent; - parents_to_queue_nr++; - } - } - - /* The first parent must come out first from the prio_queue */ - while (parents_to_queue_nr) - prio_queue_put(&queue, - parents_to_queue[--parents_to_queue_nr]); - } - - clear_prio_queue(&queue); - free(parents_to_queue); -} - -static int subpath_matches(const char *path, const char *filter) -{ - const char *subpath = path; - - while (subpath) { - if (!wildmatch(filter, subpath, 0)) - return subpath - path; - subpath = strchr(subpath, '/'); - if (subpath) - subpath++; - } - return -1; -} - -static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous) -{ - if (shorten_unambiguous) - refname = shorten_unambiguous_ref(refname, 0); - else if (skip_prefix(refname, "refs/heads/", &refname)) - ; /* refname already advanced */ - else - skip_prefix(refname, "refs/", &refname); - return refname; -} - -struct name_ref_data { - int tags_only; - int name_only; - struct string_list ref_filters; - struct string_list exclude_filters; -}; - -static struct tip_table { - struct tip_table_entry { - struct object_id oid; - const char *refname; - struct commit *commit; - timestamp_t taggerdate; - unsigned int from_tag:1; - unsigned int deref:1; - } *table; - int nr; - int alloc; - int sorted; -} tip_table; - -static void add_to_tip_table(const struct object_id *oid, const char *refname, - int shorten_unambiguous, struct commit *commit, - timestamp_t taggerdate, int from_tag, int deref) -{ - refname = name_ref_abbrev(refname, shorten_unambiguous); - - ALLOC_GROW(tip_table.table, tip_table.nr + 1, tip_table.alloc); - oidcpy(&tip_table.table[tip_table.nr].oid, oid); - tip_table.table[tip_table.nr].refname = xstrdup(refname); - tip_table.table[tip_table.nr].commit = commit; - tip_table.table[tip_table.nr].taggerdate = taggerdate; - tip_table.table[tip_table.nr].from_tag = from_tag; - tip_table.table[tip_table.nr].deref = deref; - tip_table.nr++; - tip_table.sorted = 0; -} - -static int tipcmp(const void *a_, const void *b_) -{ - const struct tip_table_entry *a = a_, *b = b_; - return oidcmp(&a->oid, &b->oid); -} - -static int cmp_by_tag_and_age(const void *a_, const void *b_) -{ - const struct tip_table_entry *a = a_, *b = b_; - int cmp; - - /* Prefer tags. */ - cmp = b->from_tag - a->from_tag; - if (cmp) - return cmp; - - /* Older is better. */ - if (a->taggerdate < b->taggerdate) - return -1; - return a->taggerdate != b->taggerdate; -} - -static int name_ref(const char *path, const struct object_id *oid, int flags, void *cb_data) -{ - struct object *o = parse_object(the_repository, oid); - struct name_ref_data *data = cb_data; - int can_abbreviate_output = data->tags_only && data->name_only; - int deref = 0; - int from_tag = 0; - struct commit *commit = NULL; - timestamp_t taggerdate = TIME_MAX; - - if (data->tags_only && !starts_with(path, "refs/tags/")) - return 0; - - if (data->exclude_filters.nr) { - struct string_list_item *item; - - for_each_string_list_item(item, &data->exclude_filters) { - if (subpath_matches(path, item->string) >= 0) - return 0; - } - } - - if (data->ref_filters.nr) { - struct string_list_item *item; - int matched = 0; - - /* See if any of the patterns match. */ - for_each_string_list_item(item, &data->ref_filters) { - /* - * Check all patterns even after finding a match, so - * that we can see if a match with a subpath exists. - * When a user asked for 'refs/tags/v*' and 'v1.*', - * both of which match, the user is showing her - * willingness to accept a shortened output by having - * the 'v1.*' in the acceptable refnames, so we - * shouldn't stop when seeing 'refs/tags/v1.4' matches - * 'refs/tags/v*'. We should show it as 'v1.4'. - */ - switch (subpath_matches(path, item->string)) { - case -1: /* did not match */ - break; - case 0: /* matched fully */ - matched = 1; - break; - default: /* matched subpath */ - matched = 1; - can_abbreviate_output = 1; - break; - } - } - - /* If none of the patterns matched, stop now */ - if (!matched) - return 0; - } - - while (o && o->type == OBJ_TAG) { - struct tag *t = (struct tag *) o; - if (!t->tagged) - break; /* broken repository */ - o = parse_object(the_repository, &t->tagged->oid); - deref = 1; - taggerdate = t->date; - } - if (o && o->type == OBJ_COMMIT) { - commit = (struct commit *)o; - from_tag = starts_with(path, "refs/tags/"); - if (taggerdate == TIME_MAX) - taggerdate = commit->date; - } - - add_to_tip_table(oid, path, can_abbreviate_output, commit, taggerdate, - from_tag, deref); - return 0; -} - -static void name_tips(void) -{ - int i; - - /* - * Try to set better names first, so that worse ones spread - * less. - */ - QSORT(tip_table.table, tip_table.nr, cmp_by_tag_and_age); - for (i = 0; i < tip_table.nr; i++) { - struct tip_table_entry *e = &tip_table.table[i]; - if (e->commit) { - name_rev(e->commit, e->refname, e->taggerdate, - e->from_tag, e->deref); - } - } -} - -static const unsigned char *nth_tip_table_ent(size_t ix, void *table_) -{ - struct tip_table_entry *table = table_; - return table[ix].oid.hash; -} - -static const char *get_exact_ref_match(const struct object *o) -{ - int found; - - if (!tip_table.table || !tip_table.nr) - return NULL; - - if (!tip_table.sorted) { - QSORT(tip_table.table, tip_table.nr, tipcmp); - tip_table.sorted = 1; - } - - found = sha1_pos(o->oid.hash, tip_table.table, tip_table.nr, - nth_tip_table_ent); - if (0 <= found) - return tip_table.table[found].refname; - return NULL; -} - -/* may return a constant string or use "buf" as scratch space */ -static const char *get_rev_name(const struct object *o, struct strbuf *buf) -{ - struct rev_name *n; - const struct commit *c; - - if (o->type != OBJ_COMMIT) - return get_exact_ref_match(o); - c = (const struct commit *) o; - n = get_commit_rev_name(c); - if (!n) - return NULL; - - if (!n->generation) - return n->tip_name; - else { - strbuf_reset(buf); - strbuf_addstr(buf, n->tip_name); - strbuf_strip_suffix(buf, "^0"); - strbuf_addf(buf, "~%d", n->generation); - return buf->buf; - } -} - -static void show_name(const struct object *obj, - const char *caller_name, - int always, int allow_undefined, int name_only) -{ - const char *name; - const struct object_id *oid = &obj->oid; - struct strbuf buf = STRBUF_INIT; - - if (!name_only) - printf("%s ", caller_name ? caller_name : oid_to_hex(oid)); - name = get_rev_name(obj, &buf); - if (name) - printf("%s\n", name); - else if (allow_undefined) - printf("undefined\n"); - else if (always) - printf("%s\n", find_unique_abbrev(oid, DEFAULT_ABBREV)); - else - die("cannot describe '%s'", oid_to_hex(oid)); - strbuf_release(&buf); -} - -static char const * const name_rev_usage[] = { - N_("git name-rev [<options>] <commit>..."), - N_("git name-rev [<options>] --all"), - N_("git name-rev [<options>] --stdin"), - NULL -}; - -static void name_rev_line(char *p, struct name_ref_data *data) -{ - struct strbuf buf = STRBUF_INIT; - int counter = 0; - char *p_start; - const unsigned hexsz = the_hash_algo->hexsz; - - for (p_start = p; *p; p++) { -#define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f')) - if (!ishex(*p)) - counter = 0; - else if (++counter == hexsz && - !ishex(*(p+1))) { - struct object_id oid; - const char *name = NULL; - char c = *(p+1); - int p_len = p - p_start + 1; - - counter = 0; - - *(p+1) = 0; - if (!get_oid(p - (hexsz - 1), &oid)) { - struct object *o = - lookup_object(the_repository, &oid); - if (o) - name = get_rev_name(o, &buf); - } - *(p+1) = c; - - if (!name) - continue; - - if (data->name_only) - printf("%.*s%s", p_len - hexsz, p_start, name); - else - printf("%.*s (%s)", p_len, p_start, name); - p_start = p + 1; - } - } - - /* flush */ - if (p_start != p) - fwrite(p_start, p - p_start, 1, stdout); - - strbuf_release(&buf); -} - -int cmd_name_rev(int argc, const char **argv, const char *prefix) -{ - struct object_array revs = OBJECT_ARRAY_INIT; - int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0, peel_tag = 0; - struct name_ref_data data = { 0, 0, STRING_LIST_INIT_NODUP, STRING_LIST_INIT_NODUP }; - struct option opts[] = { - OPT_BOOL(0, "name-only", &data.name_only, N_("print only ref-based names (no object names)")), - OPT_BOOL(0, "tags", &data.tags_only, N_("only use tags to name the commits")), - OPT_STRING_LIST(0, "refs", &data.ref_filters, N_("pattern"), - N_("only use refs matching <pattern>")), - OPT_STRING_LIST(0, "exclude", &data.exclude_filters, N_("pattern"), - N_("ignore refs matching <pattern>")), - OPT_GROUP(""), - OPT_BOOL(0, "all", &all, N_("list all commits reachable from all refs")), - OPT_BOOL(0, "stdin", &transform_stdin, N_("read from stdin")), - OPT_BOOL(0, "undefined", &allow_undefined, N_("allow to print `undefined` names (default)")), - OPT_BOOL(0, "always", &always, - N_("show abbreviated commit object as fallback")), - { - /* A Hidden OPT_BOOL */ - OPTION_SET_INT, 0, "peel-tag", &peel_tag, NULL, - N_("dereference tags in the input (internal use)"), - PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1, - }, - OPT_END(), - }; - - init_commit_rev_name(&rev_names); - git_config(git_default_config, NULL); - argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0); - if (all + transform_stdin + !!argc > 1) { - error("Specify either a list, or --all, not both!"); - usage_with_options(name_rev_usage, opts); - } - if (all || transform_stdin) - cutoff = 0; - - for (; argc; argc--, argv++) { - struct object_id oid; - struct object *object; - struct commit *commit; - - if (get_oid(*argv, &oid)) { - fprintf(stderr, "Could not get sha1 for %s. Skipping.\n", - *argv); - continue; - } - - commit = NULL; - object = parse_object(the_repository, &oid); - if (object) { - struct object *peeled = deref_tag(the_repository, - object, *argv, 0); - if (peeled && peeled->type == OBJ_COMMIT) - commit = (struct commit *)peeled; - } - - if (!object) { - fprintf(stderr, "Could not get object for %s. Skipping.\n", - *argv); - continue; - } - - if (commit) { - if (cutoff > commit->date) - cutoff = commit->date; - } - - if (peel_tag) { - if (!commit) { - fprintf(stderr, "Could not get commit for %s. Skipping.\n", - *argv); - continue; - } - object = (struct object *)commit; - } - add_object_array(object, *argv, &revs); - } - - if (cutoff) { - /* check for undeflow */ - if (cutoff > TIME_MIN + CUTOFF_DATE_SLOP) - cutoff = cutoff - CUTOFF_DATE_SLOP; - else - cutoff = TIME_MIN; - } - for_each_ref(name_ref, &data); - name_tips(); - - if (transform_stdin) { - char buffer[2048]; - - while (!feof(stdin)) { - char *p = fgets(buffer, sizeof(buffer), stdin); - if (!p) - break; - name_rev_line(p, &data); - } - } else if (all) { - int i, max; - - max = get_max_object_index(); - for (i = 0; i < max; i++) { - struct object *obj = get_indexed_object(i); - if (!obj || obj->type != OBJ_COMMIT) - continue; - show_name(obj, NULL, - always, allow_undefined, data.name_only); - } - } else { - int i; - for (i = 0; i < revs.nr; i++) - show_name(revs.objects[i].item, revs.objects[i].name, - always, allow_undefined, data.name_only); - } - - UNLEAK(revs); - return 0; -} |