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![Junio C Hamano](/assets/img/avatar_default.png)
When both heads/foo and tags/foo exist, get_sha1_basic("foo") picked up the tag without complaining, which is quite confusing. Make sure we require unambiguous form, "heads/foo" or "tags/foo" in such cases. Signed-off-by: Junio C Hamano <junkio@cox.net>
579 lines
14 KiB
C
579 lines
14 KiB
C
#include <stdlib.h>
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#include "cache.h"
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#include "commit.h"
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#include "refs.h"
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static const char show_branch_usage[] =
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"git-show-branch [--all] [--heads] [--tags] [--more=count | --list | --independent | --merge-base ] [<refs>...]";
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#define UNINTERESTING 01
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#define REV_SHIFT 2
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#define MAX_REVS 29 /* should not exceed bits_per_int - REV_SHIFT */
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static struct commit *interesting(struct commit_list *list)
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{
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while (list) {
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struct commit *commit = list->item;
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list = list->next;
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if (commit->object.flags & UNINTERESTING)
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continue;
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return commit;
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}
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return NULL;
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}
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static struct commit *pop_one_commit(struct commit_list **list_p)
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{
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struct commit *commit;
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struct commit_list *list;
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list = *list_p;
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commit = list->item;
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*list_p = list->next;
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free(list);
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return commit;
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}
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struct commit_name {
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const char *head_name; /* which head's ancestor? */
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int generation; /* how many parents away from head_name */
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};
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/* Name the commit as nth generation ancestor of head_name;
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* we count only the first-parent relationship for naming purposes.
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*/
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static void name_commit(struct commit *commit, const char *head_name, int nth)
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{
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struct commit_name *name;
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if (!commit->object.util)
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commit->object.util = xmalloc(sizeof(struct commit_name));
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name = commit->object.util;
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name->head_name = head_name;
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name->generation = nth;
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}
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/* Parent is the first parent of the commit. We may name it
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* as (n+1)th generation ancestor of the same head_name as
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* commit is nth generation ancestore of, if that generation
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* number is better than the name it already has.
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*/
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static void name_parent(struct commit *commit, struct commit *parent)
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{
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struct commit_name *commit_name = commit->object.util;
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struct commit_name *parent_name = parent->object.util;
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if (!commit_name)
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return;
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if (!parent_name ||
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commit_name->generation + 1 < parent_name->generation)
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name_commit(parent, commit_name->head_name,
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commit_name->generation + 1);
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}
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static int name_first_parent_chain(struct commit *c)
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{
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int i = 0;
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while (c) {
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struct commit *p;
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if (!c->object.util)
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break;
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if (!c->parents)
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break;
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p = c->parents->item;
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if (!p->object.util) {
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name_parent(c, p);
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i++;
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}
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c = p;
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}
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return i;
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}
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static void name_commits(struct commit_list *list,
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struct commit **rev,
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char **ref_name,
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int num_rev)
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{
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struct commit_list *cl;
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struct commit *c;
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int i;
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/* First give names to the given heads */
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for (cl = list; cl; cl = cl->next) {
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c = cl->item;
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if (c->object.util)
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continue;
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for (i = 0; i < num_rev; i++) {
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if (rev[i] == c) {
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name_commit(c, ref_name[i], 0);
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break;
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}
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}
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}
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/* Then commits on the first parent ancestry chain */
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do {
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i = 0;
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for (cl = list; cl; cl = cl->next) {
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i += name_first_parent_chain(cl->item);
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}
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} while (i);
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/* Finally, any unnamed commits */
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do {
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i = 0;
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for (cl = list; cl; cl = cl->next) {
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struct commit_list *parents;
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struct commit_name *n;
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int nth;
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c = cl->item;
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if (!c->object.util)
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continue;
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n = c->object.util;
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parents = c->parents;
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nth = 0;
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while (parents) {
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struct commit *p = parents->item;
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char newname[1000], *en;
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parents = parents->next;
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nth++;
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if (p->object.util)
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continue;
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en = newname;
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switch (n->generation) {
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case 0:
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en += sprintf(en, "%s", n->head_name);
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break;
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case 1:
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en += sprintf(en, "%s^", n->head_name);
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break;
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default:
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en += sprintf(en, "%s~%d",
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n->head_name, n->generation);
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break;
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}
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if (nth == 1)
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en += sprintf(en, "^");
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else
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en += sprintf(en, "^%d", nth);
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name_commit(p, strdup(newname), 0);
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i++;
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name_first_parent_chain(p);
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}
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}
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} while (i);
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}
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static int mark_seen(struct commit *commit, struct commit_list **seen_p)
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{
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if (!commit->object.flags) {
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insert_by_date(commit, seen_p);
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return 1;
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}
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return 0;
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}
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static void join_revs(struct commit_list **list_p,
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struct commit_list **seen_p,
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int num_rev, int extra)
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{
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int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
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int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
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while (*list_p) {
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struct commit_list *parents;
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int still_interesting = !!interesting(*list_p);
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struct commit *commit = pop_one_commit(list_p);
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int flags = commit->object.flags & all_mask;
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if (!still_interesting && extra <= 0)
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break;
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mark_seen(commit, seen_p);
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if ((flags & all_revs) == all_revs)
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flags |= UNINTERESTING;
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parents = commit->parents;
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while (parents) {
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struct commit *p = parents->item;
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int this_flag = p->object.flags;
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parents = parents->next;
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if ((this_flag & flags) == flags)
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continue;
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if (!p->object.parsed)
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parse_commit(p);
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if (mark_seen(p, seen_p) && !still_interesting)
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extra--;
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p->object.flags |= flags;
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insert_by_date(p, list_p);
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}
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}
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/*
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* Postprocess to complete well-poisoning.
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*
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* At this point we have all the commits we have seen in
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* seen_p list (which happens to be sorted chronologically but
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* it does not really matter). Mark anything that can be
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* reached from uninteresting commits not interesting.
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*/
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for (;;) {
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int changed = 0;
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struct commit_list *s;
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for (s = *seen_p; s; s = s->next) {
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struct commit *c = s->item;
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struct commit_list *parents;
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if (((c->object.flags & all_revs) != all_revs) &&
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!(c->object.flags & UNINTERESTING))
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continue;
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/* The current commit is either a merge base or
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* already uninteresting one. Mark its parents
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* as uninteresting commits _only_ if they are
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* already parsed. No reason to find new ones
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* here.
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*/
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parents = c->parents;
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while (parents) {
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struct commit *p = parents->item;
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parents = parents->next;
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if (!(p->object.flags & UNINTERESTING)) {
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p->object.flags |= UNINTERESTING;
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changed = 1;
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}
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}
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}
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if (!changed)
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break;
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}
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}
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static void show_one_commit(struct commit *commit, int no_name)
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{
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char pretty[256], *cp;
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struct commit_name *name = commit->object.util;
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if (commit->object.parsed)
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pretty_print_commit(CMIT_FMT_ONELINE, commit->buffer, ~0,
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pretty, sizeof(pretty));
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else
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strcpy(pretty, "(unavailable)");
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if (!strncmp(pretty, "[PATCH] ", 8))
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cp = pretty + 8;
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else
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cp = pretty;
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if (!no_name) {
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if (name && name->head_name) {
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printf("[%s", name->head_name);
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if (name->generation) {
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if (name->generation == 1)
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printf("^");
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else
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printf("~%d", name->generation);
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}
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printf("] ");
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}
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else
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printf("[%s] ",
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find_unique_abbrev(commit->object.sha1, 7));
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}
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puts(cp);
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}
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static char *ref_name[MAX_REVS + 1];
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static int ref_name_cnt;
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static int compare_ref_name(const void *a_, const void *b_)
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{
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const char * const*a = a_, * const*b = b_;
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return strcmp(*a, *b);
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}
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static void sort_ref_range(int bottom, int top)
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{
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qsort(ref_name + bottom, top - bottom, sizeof(ref_name[0]),
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compare_ref_name);
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}
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static int append_ref(const char *refname, const unsigned char *sha1)
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{
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struct commit *commit = lookup_commit_reference_gently(sha1, 1);
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if (!commit)
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return 0;
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if (MAX_REVS <= ref_name_cnt) {
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fprintf(stderr, "warning: ignoring %s; "
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"cannot handle more than %d refs",
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refname, MAX_REVS);
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return 0;
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}
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ref_name[ref_name_cnt++] = strdup(refname);
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ref_name[ref_name_cnt] = NULL;
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return 0;
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}
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static int append_head_ref(const char *refname, const unsigned char *sha1)
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{
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unsigned char tmp[20];
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int ofs = 11;
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if (strncmp(refname, "refs/heads/", ofs))
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return 0;
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/* If both heads/foo and tags/foo exists, get_sha1 would
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* get confused.
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*/
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if (get_sha1(refname + ofs, tmp) || memcmp(tmp, sha1, 20))
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ofs = 5;
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return append_ref(refname + ofs, sha1);
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}
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static int append_tag_ref(const char *refname, const unsigned char *sha1)
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{
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if (strncmp(refname, "refs/tags/", 10))
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return 0;
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return append_ref(refname + 5, sha1);
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}
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static void snarf_refs(int head, int tag)
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{
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if (head) {
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int orig_cnt = ref_name_cnt;
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for_each_ref(append_head_ref);
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sort_ref_range(orig_cnt, ref_name_cnt);
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}
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if (tag) {
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int orig_cnt = ref_name_cnt;
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for_each_ref(append_tag_ref);
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sort_ref_range(orig_cnt, ref_name_cnt);
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}
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}
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static int rev_is_head(char *head_path, int headlen,
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char *name,
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unsigned char *head_sha1, unsigned char *sha1)
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{
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int namelen;
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if ((!head_path[0]) || memcmp(head_sha1, sha1, 20))
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return 0;
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namelen = strlen(name);
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if ((headlen < namelen) ||
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memcmp(head_path + headlen - namelen, name, namelen))
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return 0;
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if (headlen == namelen ||
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head_path[headlen - namelen - 1] == '/')
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return 1;
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return 0;
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}
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static int show_merge_base(struct commit_list *seen, int num_rev)
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{
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int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
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int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
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int exit_status = 1;
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while (seen) {
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struct commit *commit = pop_one_commit(&seen);
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int flags = commit->object.flags & all_mask;
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if (!(flags & UNINTERESTING) &&
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((flags & all_revs) == all_revs)) {
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puts(sha1_to_hex(commit->object.sha1));
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exit_status = 0;
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commit->object.flags |= UNINTERESTING;
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}
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}
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return exit_status;
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}
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static int show_independent(struct commit **rev,
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int num_rev,
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char **ref_name,
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unsigned int *rev_mask)
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{
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int i;
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for (i = 0; i < num_rev; i++) {
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struct commit *commit = rev[i];
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unsigned int flag = rev_mask[i];
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if (commit->object.flags == flag)
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puts(sha1_to_hex(commit->object.sha1));
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commit->object.flags |= UNINTERESTING;
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}
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return 0;
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}
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int main(int ac, char **av)
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{
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struct commit *rev[MAX_REVS], *commit;
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struct commit_list *list = NULL, *seen = NULL;
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unsigned int rev_mask[MAX_REVS];
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int num_rev, i, extra = 0;
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int all_heads = 0, all_tags = 0;
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int all_mask, all_revs;
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char head_path[128];
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const char *head_path_p;
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int head_path_len;
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unsigned char head_sha1[20];
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int merge_base = 0;
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int independent = 0;
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int no_name = 0;
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int sha1_name = 0;
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int shown_merge_point = 0;
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int topo_order = 0;
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setup_git_directory();
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while (1 < ac && av[1][0] == '-') {
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char *arg = av[1];
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if (!strcmp(arg, "--all"))
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all_heads = all_tags = 1;
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else if (!strcmp(arg, "--heads"))
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all_heads = 1;
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else if (!strcmp(arg, "--tags"))
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all_tags = 1;
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else if (!strcmp(arg, "--more"))
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extra = 1;
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else if (!strcmp(arg, "--list"))
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extra = -1;
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else if (!strcmp(arg, "--no-name"))
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no_name = 1;
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else if (!strcmp(arg, "--sha1-name"))
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sha1_name = 1;
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else if (!strncmp(arg, "--more=", 7))
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extra = atoi(arg + 7);
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else if (!strcmp(arg, "--merge-base"))
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merge_base = 1;
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else if (!strcmp(arg, "--independent"))
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independent = 1;
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else if (!strcmp(arg, "--topo-order"))
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topo_order = 1;
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else
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usage(show_branch_usage);
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ac--; av++;
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}
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ac--; av++;
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/* Only one of these is allowed */
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if (1 < independent + merge_base + (extra != 0))
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usage(show_branch_usage);
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if (all_heads + all_tags)
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snarf_refs(all_heads, all_tags);
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while (0 < ac) {
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unsigned char revkey[20];
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if (get_sha1(*av, revkey))
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die("bad sha1 reference %s", *av);
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append_ref(*av, revkey);
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ac--; av++;
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}
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/* If still no revs, then add heads */
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if (!ref_name_cnt)
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snarf_refs(1, 0);
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for (num_rev = 0; ref_name[num_rev]; num_rev++) {
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unsigned char revkey[20];
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unsigned int flag = 1u << (num_rev + REV_SHIFT);
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if (MAX_REVS <= num_rev)
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die("cannot handle more than %d revs.", MAX_REVS);
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if (get_sha1(ref_name[num_rev], revkey))
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die("'%s' is not a valid ref.\n", ref_name[num_rev]);
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commit = lookup_commit_reference(revkey);
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if (!commit)
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die("cannot find commit %s (%s)",
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ref_name[num_rev], revkey);
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parse_commit(commit);
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mark_seen(commit, &seen);
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/* rev#0 uses bit REV_SHIFT, rev#1 uses bit REV_SHIFT+1,
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* and so on. REV_SHIFT bits from bit 0 are used for
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* internal bookkeeping.
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*/
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commit->object.flags |= flag;
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if (commit->object.flags == flag)
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insert_by_date(commit, &list);
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rev[num_rev] = commit;
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}
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for (i = 0; i < num_rev; i++)
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rev_mask[i] = rev[i]->object.flags;
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if (0 <= extra)
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join_revs(&list, &seen, num_rev, extra);
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head_path_p = resolve_ref(git_path("HEAD"), head_sha1, 1);
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if (head_path_p) {
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head_path_len = strlen(head_path_p);
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memcpy(head_path, head_path_p, head_path_len + 1);
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}
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else {
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head_path_len = 0;
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head_path[0] = 0;
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}
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if (merge_base)
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return show_merge_base(seen, num_rev);
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if (independent)
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return show_independent(rev, num_rev, ref_name, rev_mask);
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|
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/* Show list; --more=-1 means list-only */
|
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if (1 < num_rev || extra < 0) {
|
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for (i = 0; i < num_rev; i++) {
|
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int j;
|
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int is_head = rev_is_head(head_path,
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head_path_len,
|
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ref_name[i],
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head_sha1,
|
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rev[i]->object.sha1);
|
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if (extra < 0)
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printf("%c [%s] ",
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is_head ? '*' : ' ', ref_name[i]);
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else {
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|
for (j = 0; j < i; j++)
|
|
putchar(' ');
|
|
printf("%c [%s] ",
|
|
is_head ? '*' : '!', ref_name[i]);
|
|
}
|
|
/* header lines never need name */
|
|
show_one_commit(rev[i], 1);
|
|
}
|
|
if (0 <= extra) {
|
|
for (i = 0; i < num_rev; i++)
|
|
putchar('-');
|
|
putchar('\n');
|
|
}
|
|
}
|
|
if (extra < 0)
|
|
exit(0);
|
|
|
|
/* Sort topologically */
|
|
if (topo_order)
|
|
sort_in_topological_order(&seen);
|
|
|
|
/* Give names to commits */
|
|
if (!sha1_name && !no_name)
|
|
name_commits(seen, rev, ref_name, num_rev);
|
|
|
|
all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
|
|
all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
|
|
|
|
while (seen) {
|
|
struct commit *commit = pop_one_commit(&seen);
|
|
int this_flag = commit->object.flags;
|
|
|
|
shown_merge_point |= ((this_flag & all_revs) == all_revs);
|
|
|
|
if (1 < num_rev) {
|
|
for (i = 0; i < num_rev; i++)
|
|
putchar((this_flag & (1u << (i + REV_SHIFT)))
|
|
? '+' : ' ');
|
|
putchar(' ');
|
|
}
|
|
show_one_commit(commit, no_name);
|
|
|
|
if (shown_merge_point && --extra < 0)
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|