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-rw-r--r--builtin/merge-base.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/builtin/merge-base.c b/builtin/merge-base.c
new file mode 100644
index 0000000000..4f30f1b0c8
--- /dev/null
+++ b/builtin/merge-base.c
@@ -0,0 +1,102 @@
+#include "builtin.h"
+#include "cache.h"
+#include "commit.h"
+#include "parse-options.h"
+
+static int show_merge_base(struct commit **rev, int rev_nr, int show_all)
+{
+ struct commit_list *result;
+
+ result = get_merge_bases_many(rev[0], rev_nr - 1, rev + 1, 0);
+
+ if (!result)
+ return 1;
+
+ while (result) {
+ printf("%s\n", sha1_to_hex(result->item->object.sha1));
+ if (!show_all)
+ return 0;
+ result = result->next;
+ }
+
+ return 0;
+}
+
+static const char * const merge_base_usage[] = {
+ "git merge-base [-a|--all] <commit> <commit>...",
+ "git merge-base [-a|--all] --octopus <commit>...",
+ "git merge-base --independent <commit>...",
+ NULL
+};
+
+static struct commit *get_commit_reference(const char *arg)
+{
+ unsigned char revkey[20];
+ struct commit *r;
+
+ if (get_sha1(arg, revkey))
+ die("Not a valid object name %s", arg);
+ r = lookup_commit_reference(revkey);
+ if (!r)
+ die("Not a valid commit name %s", arg);
+
+ return r;
+}
+
+static int handle_octopus(int count, const char **args, int reduce, int show_all)
+{
+ struct commit_list *revs = NULL;
+ struct commit_list *result;
+ int i;
+
+ if (reduce)
+ show_all = 1;
+
+ for (i = count - 1; i >= 0; i--)
+ commit_list_insert(get_commit_reference(args[i]), &revs);
+
+ result = reduce ? reduce_heads(revs) : get_octopus_merge_bases(revs);
+
+ if (!result)
+ return 1;
+
+ while (result) {
+ printf("%s\n", sha1_to_hex(result->item->object.sha1));
+ if (!show_all)
+ return 0;
+ result = result->next;
+ }
+
+ 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 octopus = 0;
+ int reduce = 0;
+
+ struct option options[] = {
+ OPT_BOOLEAN('a', "all", &show_all, "output all common ancestors"),
+ OPT_BOOLEAN(0, "octopus", &octopus, "find ancestors for a single n-way merge"),
+ OPT_BOOLEAN(0, "independent", &reduce, "list revs not reachable from others"),
+ OPT_END()
+ };
+
+ git_config(git_default_config, NULL);
+ argc = parse_options(argc, argv, prefix, options, merge_base_usage, 0);
+ if (!octopus && !reduce && argc < 2)
+ usage_with_options(merge_base_usage, options);
+ if (reduce && (show_all || octopus))
+ die("--independent cannot be used with other options");
+
+ if (octopus || reduce)
+ return handle_octopus(argc, argv, reduce, show_all);
+
+ rev = xmalloc(argc * sizeof(*rev));
+ while (argc-- > 0)
+ rev[rev_nr++] = get_commit_reference(*argv++);
+ return show_merge_base(rev, rev_nr, show_all);
+}