1 files changed, 84 insertions, 0 deletions
diff --git a/builtin/merge-recursive.c b/builtin/merge-recursive.c
new file mode 100644
index 0000000000..d8875d5892
--- /dev/null
+++ b/builtin/merge-recursive.c
@@ -0,0 +1,84 @@
+#include "cache.h"
+#include "commit.h"
+#include "tag.h"
+#include "merge-recursive.h"
+
+static const char *better_branch_name(const char *branch)
+{
+	static char githead_env[8 + 40 + 1];
+	char *name;
+
+	if (strlen(branch) != 40)
+		return branch;
+	sprintf(githead_env, "GITHEAD_%s", branch);
+	name = getenv(githead_env);
+	return name ? name : branch;
+}
+
+int cmd_merge_recursive(int argc, const char **argv, const char *prefix)
+{
+	const unsigned char *bases[21];
+	unsigned bases_count = 0;
+	int i, failed;
+	unsigned char h1[20], h2[20];
+	struct merge_options o;
+	struct commit *result;
+
+	init_merge_options(&o);
+	if (argv[0] && !suffixcmp(argv[0], "-subtree"))
+		o.subtree_shift = "";
+
+	if (argc < 4)
+		usagef("%s <base>... -- <head> <remote> ...", argv[0]);
+
+	for (i = 1; i < argc; ++i) {
+		const char *arg = argv[i];
+
+		if (!prefixcmp(arg, "--")) {
+			if (!arg[2])
+				break;
+			if (!strcmp(arg+2, "ours"))
+				o.recursive_variant = MERGE_RECURSIVE_OURS;
+			else if (!strcmp(arg+2, "theirs"))
+				o.recursive_variant = MERGE_RECURSIVE_THEIRS;
+			else if (!strcmp(arg+2, "subtree"))
+				o.subtree_shift = "";
+			else if (!prefixcmp(arg+2, "subtree="))
+				o.subtree_shift = arg + 10;
+			else
+				die("Unknown option %s", arg);
+			continue;
+		}
+		if (bases_count < ARRAY_SIZE(bases)-1) {
+			unsigned char *sha = xmalloc(20);
+			if (get_sha1(argv[i], sha))
+				die("Could not parse object '%s'", argv[i]);
+			bases[bases_count++] = sha;
+		}
+		else
+			warning("Cannot handle more than %d bases. "
+				"Ignoring %s.",
+				(int)ARRAY_SIZE(bases)-1, argv[i]);
+	}
+	if (argc - i != 3) /* "--" "<head>" "<remote>" */
+		die("Not handling anything other than two heads merge.");
+
+	o.branch1 = argv[++i];
+	o.branch2 = argv[++i];
+
+	if (get_sha1(o.branch1, h1))
+		die("Could not resolve ref '%s'", o.branch1);
+	if (get_sha1(o.branch2, h2))
+		die("Could not resolve ref '%s'", o.branch2);
+
+	o.branch1 = better_branch_name(o.branch1);
+	o.branch2 = better_branch_name(o.branch2);
+
+	if (o.verbosity >= 3)
+		printf("Merging %s with %s\n", o.branch1, o.branch2);
+
+	failed = merge_recursive_generic(&o, h1, h2, bases_count, bases, &result);
+	if (failed < 0)
+		return 128; /* die() error code */
+	return failed;
+}