#include "cache.h"
#include "commit.h"
-static struct commit *process_list(struct commit_list **list_p, int this_mark,
- int other_mark)
-{
- struct commit *item = (*list_p)->item;
-
- if (item->object.flags & other_mark) {
- return item;
- } else {
- pop_most_recent_commit(list_p, this_mark);
- }
- return NULL;
-}
+static int show_all = 0;
-struct commit *common_ancestor(struct commit *rev1, struct commit *rev2)
+static int merge_base(struct commit *rev1, struct commit *rev2)
{
- struct commit_list *rev1list = NULL;
- struct commit_list *rev2list = NULL;
-
- commit_list_insert(rev1, &rev1list);
- rev1->object.flags |= 0x1;
- commit_list_insert(rev2, &rev2list);
- rev2->object.flags |= 0x2;
+ struct commit_list *result = get_merge_bases(rev1, rev2, 0);
- parse_commit(rev1);
- parse_commit(rev2);
+ if (!result)
+ return 1;
- while (rev1list || rev2list) {
- struct commit *ret;
- if (!rev1list) {
- // process 2
- ret = process_list(&rev2list, 0x2, 0x1);
- } else if (!rev2list) {
- // process 1
- ret = process_list(&rev1list, 0x1, 0x2);
- } else if (rev1list->item->date < rev2list->item->date) {
- // process 2
- ret = process_list(&rev2list, 0x2, 0x1);
- } else {
- // process 1
- ret = process_list(&rev1list, 0x1, 0x2);
- }
- if (ret) {
- free_commit_list(rev1list);
- free_commit_list(rev2list);
- return ret;
- }
+ while (result) {
+ printf("%s\n", sha1_to_hex(result->item->object.sha1));
+ if (!show_all)
+ return 0;
+ result = result->next;
}
- return NULL;
+
+ return 0;
}
+static const char merge_base_usage[] =
+"git-merge-base [--all] <commit-id> <commit-id>";
+
int main(int argc, char **argv)
{
- struct commit *rev1, *rev2, *ret;
+ struct commit *rev1, *rev2;
unsigned char rev1key[20], rev2key[20];
- if (argc != 3 ||
- get_sha1(argv[1], rev1key) ||
- get_sha1(argv[2], rev2key)) {
- usage("git-merge-base <commit-id> <commit-id>");
+ setup_git_directory();
+ git_config(git_default_config);
+
+ while (1 < argc && argv[1][0] == '-') {
+ char *arg = argv[1];
+ if (!strcmp(arg, "-a") || !strcmp(arg, "--all"))
+ show_all = 1;
+ else
+ usage(merge_base_usage);
+ argc--; argv++;
}
+ if (argc != 3)
+ usage(merge_base_usage);
+ if (get_sha1(argv[1], rev1key))
+ die("Not a valid object name %s", argv[1]);
+ if (get_sha1(argv[2], rev2key))
+ die("Not a valid object name %s", argv[2]);
rev1 = lookup_commit_reference(rev1key);
rev2 = lookup_commit_reference(rev2key);
- ret = common_ancestor(rev1, rev2);
- if (!ret)
+ if (!rev1 || !rev2)
return 1;
- printf("%s\n", sha1_to_hex(ret->object.sha1));
- return 0;
+ return merge_base(rev1, rev2);
}