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#include "builtin.h"
#include "cache.h"
#include "config.h"
#include "commit.h"
#include "refs.h"
#include "diff.h"
#include "revision.h"
#include "parse-options.h"
#include "repository.h"
#include "commit-reach.h"
static int show_merge_base(struct commit **rev, int rev_nr, int show_all)
{
struct commit_list *result, *r;
result = get_merge_bases_many_dirty(rev[0], rev_nr - 1, rev + 1);
if (!result)
return 1;
for (r = result; r; r = r->next) {
printf("%s\n", oid_to_hex(&r->item->object.oid));
if (!show_all)
break;
}
free_commit_list(result);
return 0;
}
static const char * const merge_base_usage[] = {
N_("git merge-base [-a | --all] <commit> <commit>..."),
N_("git merge-base [-a | --all] --octopus <commit>..."),
N_("git merge-base --independent <commit>..."),
N_("git merge-base --is-ancestor <commit> <commit>"),
N_("git merge-base --fork-point <ref> [<commit>]"),
NULL
};
static struct commit *get_commit_reference(const char *arg)
{
struct object_id revkey;
struct commit *r;
if (get_oid(arg, &revkey))
die("Not a valid object name %s", arg);
r = lookup_commit_reference(the_repository, &revkey);
if (!r)
die("Not a valid commit name %s", arg);
return r;
}
static int handle_independent(int count, const char **args)
{
struct commit_list *revs = NULL, *rev;
int i;
for (i = count - 1; i >= 0; i--)
commit_list_insert(get_commit_reference(args[i]), &revs);
reduce_heads_replace(&revs);
if (!revs)
return 1;
for (rev = revs; rev; rev = rev->next)
printf("%s\n", oid_to_hex(&rev->item->object.oid));
free_commit_list(revs);
return 0;
}
static int handle_octopus(int count, const char **args, int show_all)
{
struct commit_list *revs = NULL;
struct commit_list *result, *rev;
int i;
for (i = count - 1; i >= 0; i--)
commit_list_insert(get_commit_reference(args[i]), &revs);
result = get_octopus_merge_bases(revs);
free_commit_list(revs);
reduce_heads_replace(&result);
if (!result)
return 1;
for (rev = result; rev; rev = rev->next) {
printf("%s\n", oid_to_hex(&rev->item->object.oid));
if (!show_all)
break;
}
free_commit_list(result);
return 0;
}
static int handle_is_ancestor(int argc, const char **argv)
{
struct commit *one, *two;
if (argc != 2)
die("--is-ancestor takes exactly two commits");
one = get_commit_reference(argv[0]);
two = get_commit_reference(argv[1]);
if (in_merge_bases(one, two))
return 0;
else
return 1;
}
static int handle_fork_point(int argc, const char **argv)
{
struct object_id oid;
char *refname;
struct commit *derived, *fork_point;
const char *commitname;
switch (dwim_ref(argv[0], strlen(argv[0]), &oid, &refname)) {
case 0:
die("No such ref: '%s'", argv[0]);
case 1:
break; /* good */
default:
die("Ambiguous refname: '%s'", argv[0]);
}
commitname = (argc == 2) ? argv[1] : "HEAD";
if (get_oid(commitname, &oid))
die("Not a valid object name: '%s'", commitname);
derived = lookup_commit_reference(the_repository, &oid);
fork_point = get_fork_point(refname, derived);
if (!fork_point)
return 1;
printf("%s\n", oid_to_hex(&fork_point->object.oid));
return 0;
}
int cmd_merge_base(int argc, const char **argv, const char *prefix)
{
struct commit **rev;
int rev_nr = 0;
int show_all = 0;
int cmdmode = 0;
struct option options[] = {
OPT_BOOL('a', "all", &show_all, N_("output all common ancestors")),
OPT_CMDMODE(0, "octopus", &cmdmode,
N_("find ancestors for a single n-way merge"), 'o'),
OPT_CMDMODE(0, "independent", &cmdmode,
N_("list revs not reachable from others"), 'r'),
OPT_CMDMODE(0, "is-ancestor", &cmdmode,
N_("is the first one ancestor of the other?"), 'a'),
OPT_CMDMODE(0, "fork-point", &cmdmode,
N_("find where <commit> forked from reflog of <ref>"), 'f'),
OPT_END()
};
git_config(git_default_config, NULL);
argc = parse_options(argc, argv, prefix, options, merge_base_usage, 0);
if (cmdmode == 'a') {
if (argc < 2)
usage_with_options(merge_base_usage, options);
if (show_all)
die("--is-ancestor cannot be used with --all");
return handle_is_ancestor(argc, argv);
}
if (cmdmode == 'r' && show_all)
die("--independent cannot be used with --all");
if (cmdmode == 'o')
return handle_octopus(argc, argv, show_all);
if (cmdmode == 'r')
return handle_independent(argc, argv);
if (cmdmode == 'f') {
if (argc < 1 || 2 < argc)
usage_with_options(merge_base_usage, options);
return handle_fork_point(argc, argv);
}
if (argc < 2)
usage_with_options(merge_base_usage, options);
ALLOC_ARRAY(rev, argc);
while (argc-- > 0)
rev[rev_nr++] = get_commit_reference(*argv++);
return show_merge_base(rev, rev_nr, show_all);
}
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