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![Junio C Hamano](/assets/img/avatar_default.png)
With the change in the previous round, we are guaranteed to come up with the list of all relevant merge bases, but sometimes we do not fully mark unintersting ones due to a horizon effect. Add a phase to postprocess, so that we mark all ancestor of "interesting" commit. This also changes the default ordering of shown commits back to chronological order, and adds --topo-order flag to show them in topological order. Signed-off-by: Junio C Hamano <junkio@cox.net>
572 lines
13 KiB
C
572 lines
13 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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if (strncmp(refname, "refs/heads/", 11))
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return 0;
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return append_ref(refname + 11, 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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usage(show_branch_usage);
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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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/* 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++)
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putchar(' ');
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printf("%c [%s] ",
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is_head ? '*' : '!', ref_name[i]);
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}
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/* header lines never need name */
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|
show_one_commit(rev[i], 1);
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|
}
|
|
if (0 <= extra) {
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|
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;
|
|
}
|