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git/show-branch.c
Junio C Hamano f5e375c9a9 Clean-up output from "git show-branch" and document it.
When showing only one branch a lot of default output becomes redundant,
so clean it up a bit, and document what is shown.  Retire the earlier
implementation "git-show-branches-script".

Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-08-22 23:18:17 -07:00

339 lines
8.2 KiB
C

#include <stdlib.h>
#include "cache.h"
#include "commit.h"
#include "refs.h"
static const char show_branch_usage[] =
"git-show-branch [--all] [--heads] [--tags] [--more=count] [<refs>...]";
#define UNINTERESTING 01
#define REV_SHIFT 2
#define MAX_REVS 29 /* should not exceed bits_per_int - REV_SHIFT */
static struct commit *interesting(struct commit_list *list)
{
while (list) {
struct commit *commit = list->item;
list = list->next;
if (commit->object.flags & UNINTERESTING)
continue;
return commit;
}
return NULL;
}
static struct commit *pop_one_commit(struct commit_list **list_p)
{
struct commit *commit;
struct commit_list *list;
list = *list_p;
commit = list->item;
*list_p = list->next;
free(list);
return commit;
}
struct commit_name {
int head_rev; /* which head's ancestor? */
int generation; /* how many parents away from head_rev */
};
/* Name the commit as nth generation ancestor of head_rev;
* we count only the first-parent relationship for naming purposes.
*/
static void name_commit(struct commit *commit, int head_rev, int nth)
{
struct commit_name *name;
if (!commit->object.util)
commit->object.util = xmalloc(sizeof(struct commit_name));
name = commit->object.util;
name->head_rev = head_rev;
name->generation = nth;
}
/* Parent is the first parent of the commit. We may name it
* as (n+1)th generation ancestor of the same head_rev as
* commit is nth generation ancestore of, if that generation
* number is better than the name it already has.
*/
static void name_parent(struct commit *commit, struct commit *parent)
{
struct commit_name *commit_name = commit->object.util;
struct commit_name *parent_name = parent->object.util;
if (!commit_name)
return;
if (!parent_name ||
commit_name->generation + 1 < parent_name->generation)
name_commit(parent, commit_name->head_rev,
commit_name->generation + 1);
}
static int mark_seen(struct commit *commit, struct commit_list **seen_p)
{
if (!commit->object.flags) {
insert_by_date(commit, seen_p);
return 1;
}
return 0;
}
static void join_revs(struct commit_list **list_p,
struct commit_list **seen_p,
int num_rev, int extra)
{
int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
while (*list_p) {
struct commit_list *parents;
struct commit *commit = pop_one_commit(list_p);
int flags = commit->object.flags & all_mask;
int nth_parent = 0;
int still_interesting = !!interesting(*list_p);
if (!still_interesting && extra < 0)
break;
mark_seen(commit, seen_p);
if ((flags & all_revs) == all_revs)
flags |= UNINTERESTING;
parents = commit->parents;
while (parents) {
struct commit *p = parents->item;
int this_flag = p->object.flags;
parents = parents->next;
nth_parent++;
if (nth_parent == 1)
name_parent(commit, p);
if ((this_flag & flags) == flags)
continue;
parse_commit(p);
if (mark_seen(p, seen_p) && !still_interesting)
extra--;
p->object.flags |= flags;
insert_by_date(p, list_p);
}
}
}
static void show_one_commit(struct commit *commit, char **head_name)
{
char pretty[128], *cp;
struct commit_name *name = commit->object.util;
pretty_print_commit(CMIT_FMT_ONELINE, commit->buffer, ~0,
pretty, sizeof(pretty));
if (!strncmp(pretty, "[PATCH] ", 8))
cp = pretty + 8;
else
cp = pretty;
if (name && head_name) {
printf("[%s", head_name[name->head_rev]);
if (name->generation)
printf("~%d", name->generation);
printf("] ");
}
puts(cp);
}
static char *ref_name[MAX_REVS + 1];
static int ref_name_cnt;
static int append_ref(const char *refname, const unsigned char *sha1)
{
struct commit *commit = lookup_commit_reference_gently(sha1, 1);
if (!commit)
return 0;
if (MAX_REVS < ref_name_cnt) {
fprintf(stderr, "warning: ignoring %s; "
"cannot handle more than %d refs",
refname, MAX_REVS);
return 0;
}
ref_name[ref_name_cnt++] = strdup(refname);
ref_name[ref_name_cnt] = NULL;
return 0;
}
static int append_head_ref(const char *refname, const unsigned char *sha1)
{
if (strncmp(refname, "refs/heads/", 11))
return 0;
return append_ref(refname + 5, sha1);
}
static int append_tag_ref(const char *refname, const unsigned char *sha1)
{
if (strncmp(refname, "refs/tags/", 10))
return 0;
return append_ref(refname + 5, sha1);
}
static void snarf_refs(int head, int tag)
{
if (head)
for_each_ref(append_head_ref);
if (tag)
for_each_ref(append_tag_ref);
}
static int rev_is_head(char *head_path, int headlen,
char *name,
unsigned char *head_sha1, unsigned char *sha1)
{
int namelen;
if ((!head_path[0]) || memcmp(head_sha1, sha1, 20))
return 0;
namelen = strlen(name);
if ((headlen < namelen) ||
memcmp(head_path + headlen - namelen, name, namelen))
return 0;
if (headlen == namelen ||
head_path[headlen - namelen - 1] == '/')
return 1;
return 0;
}
static int show_merge_base(struct commit_list *seen, int num_rev)
{
int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
while (seen) {
struct commit *commit = pop_one_commit(&seen);
int flags = commit->object.flags & all_mask;
if (!(flags & UNINTERESTING) &&
((flags & all_revs) == all_revs)) {
puts(sha1_to_hex(commit->object.sha1));
return 0;
}
}
return 1;
}
int main(int ac, char **av)
{
struct commit *rev[MAX_REVS], *commit;
struct commit_list *list = NULL, *seen = NULL;
int num_rev, i, extra = 0;
int all_heads = 0, all_tags = 0;
char head_path[128];
int head_path_len;
unsigned char head_sha1[20];
int merge_base = 0;
char **label;
while (1 < ac && av[1][0] == '-') {
char *arg = av[1];
if (!strcmp(arg, "--all"))
all_heads = all_tags = 1;
else if (!strcmp(arg, "--heads"))
all_heads = 1;
else if (!strcmp(arg, "--tags"))
all_tags = 1;
else if (!strcmp(arg, "--more"))
extra = 1;
else if (!strncmp(arg, "--more=", 7)) {
extra = atoi(arg + 7);
if (extra < 0)
usage(show_branch_usage);
}
else if (!strcmp(arg, "--merge-base"))
merge_base = 1;
else
usage(show_branch_usage);
ac--; av++;
}
ac--; av++;
if (all_heads + all_tags)
snarf_refs(all_heads, all_tags);
while (0 < ac) {
unsigned char revkey[20];
if (get_sha1(*av, revkey))
die("bad sha1 reference %s", *av);
append_ref(*av, revkey);
ac--; av++;
}
/* If still no revs, then add heads */
if (!ref_name_cnt)
snarf_refs(1, 0);
for (num_rev = 0; ref_name[num_rev]; num_rev++) {
unsigned char revkey[20];
if (MAX_REVS <= num_rev)
die("cannot handle more than %d revs.", MAX_REVS);
if (get_sha1(ref_name[num_rev], revkey))
usage(show_branch_usage);
commit = lookup_commit_reference(revkey);
if (!commit)
die("cannot find commit %s (%s)",
ref_name[num_rev], revkey);
parse_commit(commit);
if (!commit->object.util)
name_commit(commit, num_rev, 0);
mark_seen(commit, &seen);
/* rev#0 uses bit REV_SHIFT, rev#1 uses bit REV_SHIFT+1,
* and so on. REV_SHIFT bits from bit 0 are used for
* internal bookkeeping.
*/
commit->object.flags |= 1u << (num_rev + REV_SHIFT);
insert_by_date(commit, &list);
rev[num_rev] = commit;
}
join_revs(&list, &seen, num_rev, extra);
head_path_len = readlink(".git/HEAD", head_path, sizeof(head_path)-1);
if ((head_path_len < 0) || get_sha1("HEAD", head_sha1))
head_path[0] = 0;
else
head_path[head_path_len] = 0;
if (merge_base)
return show_merge_base(seen, num_rev);
/* Show list */
if (1 < num_rev) {
for (i = 0; i < num_rev; i++) {
int j;
int is_head = rev_is_head(head_path,
head_path_len,
ref_name[i],
head_sha1,
rev[i]->object.sha1);
for (j = 0; j < i; j++)
putchar(' ');
printf("%c [%s] ", is_head ? '*' : '!', ref_name[i]);
show_one_commit(rev[i], NULL);
}
for (i = 0; i < num_rev; i++)
putchar('-');
putchar('\n');
}
label = ref_name;
while (seen) {
struct commit *commit = pop_one_commit(&seen);
int this_flag = commit->object.flags;
static char *obvious[] = { "" };
if ((this_flag & UNINTERESTING) && (--extra < 0))
break;
if (1 < num_rev) {
for (i = 0; i < num_rev; i++)
putchar((this_flag & (1u << (i + REV_SHIFT)))
? '+' : ' ');
putchar(' ');
}
show_one_commit(commit, label);
if (num_rev == 1)
label = obvious;
}
return 0;
}