1 files changed, 130 insertions, 0 deletions
diff --git a/merge-index.c b/merge-index.c
new file mode 100644
index 0000000000..aa9cf23a39
--- /dev/null
+++ b/merge-index.c
@@ -0,0 +1,130 @@
+#include "cache.h"
+#include "run-command.h"
+#include "exec_cmd.h"
+
+static const char *pgm;
+static const char *arguments[9];
+static int one_shot, quiet;
+static int err;
+
+static void run_program(void)
+{
+	struct child_process child;
+	memset(&child, 0, sizeof(child));
+	child.argv = arguments;
+	if (run_command(&child)) {
+		if (one_shot) {
+			err++;
+		} else {
+			if (!quiet)
+				die("merge program failed");
+			exit(1);
+		}
+	}
+}
+
+static int merge_entry(int pos, const char *path)
+{
+	int found;
+
+	if (pos >= active_nr)
+		die("git merge-index: %s not in the cache", path);
+	arguments[0] = pgm;
+	arguments[1] = "";
+	arguments[2] = "";
+	arguments[3] = "";
+	arguments[4] = path;
+	arguments[5] = "";
+	arguments[6] = "";
+	arguments[7] = "";
+	arguments[8] = NULL;
+	found = 0;
+	do {
+		static char hexbuf[4][60];
+		static char ownbuf[4][60];
+		struct cache_entry *ce = active_cache[pos];
+		int stage = ce_stage(ce);
+
+		if (strcmp(ce->name, path))
+			break;
+		found++;
+		strcpy(hexbuf[stage], sha1_to_hex(ce->sha1));
+		sprintf(ownbuf[stage], "%o", ce->ce_mode);
+		arguments[stage] = hexbuf[stage];
+		arguments[stage + 4] = ownbuf[stage];
+	} while (++pos < active_nr);
+	if (!found)
+		die("git merge-index: %s not in the cache", path);
+	run_program();
+	return found;
+}
+
+static void merge_file(const char *path)
+{
+	int pos = cache_name_pos(path, strlen(path));
+
+	/*
+	 * If it already exists in the cache as stage0, it's
+	 * already merged and there is nothing to do.
+	 */
+	if (pos < 0)
+		merge_entry(-pos-1, path);
+}
+
+static void merge_all(void)
+{
+	int i;
+	for (i = 0; i < active_nr; i++) {
+		struct cache_entry *ce = active_cache[i];
+		if (!ce_stage(ce))
+			continue;
+		i += merge_entry(i, ce->name)-1;
+	}
+}
+
+int main(int argc, char **argv)
+{
+	int i, force_file = 0;
+
+	/* Without this we cannot rely on waitpid() to tell
+	 * what happened to our children.
+	 */
+	signal(SIGCHLD, SIG_DFL);
+
+	if (argc < 3)
+		usage("git merge-index [-o] [-q] <merge-program> (-a | [--] <filename>*)");
+
+	git_extract_argv0_path(argv[0]);
+
+	setup_git_directory();
+	read_cache();
+
+	i = 1;
+	if (!strcmp(argv[i], "-o")) {
+		one_shot = 1;
+		i++;
+	}
+	if (!strcmp(argv[i], "-q")) {
+		quiet = 1;
+		i++;
+	}
+	pgm = argv[i++];
+	for (; i < argc; i++) {
+		char *arg = argv[i];
+		if (!force_file && *arg == '-') {
+			if (!strcmp(arg, "--")) {
+				force_file = 1;
+				continue;
+			}
+			if (!strcmp(arg, "-a")) {
+				merge_all();
+				continue;
+			}
+			die("git merge-index: unknown option %s", arg);
+		}
+		merge_file(arg);
+	}
+	if (err && !quiet)
+		die("merge program failed");
+	return err;
+}