text: #include "test-tool.h"
  #include "cache.h"
  #include "commit.h"
  #include "commit-reach.h"
  #include "config.h"
  #include "parse-options.h"
  #include "ref-filter.h"
  #include "string-list.h"
  #include "tag.h"
  
  static void print_sorted_commit_ids(struct commit_list *list)
  {
  	int i;
  	struct string_list s = STRING_LIST_INIT_DUP;
  
  	while (list) {
  		string_list_append(&s, oid_to_hex(&list->item->object.oid));
  		list = list->next;
  	}
  
  	string_list_sort(&s);
  
  	for (i = 0; i < s.nr; i++)
  		printf("%s\n", s.items[i].string);
  
  	string_list_clear(&s, 0);
  }
  
  int cmd__reach(int ac, const char **av)
  {
  	struct object_id oid_A, oid_B;
  	struct commit *A, *B;
  	struct commit_list *X, *Y;
  	struct object_array X_obj = OBJECT_ARRAY_INIT;
  	struct commit **X_array, **Y_array;
  	int X_nr, X_alloc, Y_nr, Y_alloc;
  	struct strbuf buf = STRBUF_INIT;
  	struct repository *r = the_repository;
  
  	setup_git_directory();
  
  	if (ac < 2)
  		exit(1);
  
  	A = B = NULL;
  	X = Y = NULL;
  	X_nr = Y_nr = 0;
  	X_alloc = Y_alloc = 16;
  	ALLOC_ARRAY(X_array, X_alloc);
  	ALLOC_ARRAY(Y_array, Y_alloc);
  
  	while (strbuf_getline(&buf, stdin) != EOF) {
  		struct object_id oid;
  		struct object *orig;
  		struct object *peeled;
  		struct commit *c;
  		if (buf.len < 3)
  			continue;
  
  		if (get_oid_committish(buf.buf + 2, &oid))
  			die("failed to resolve %s", buf.buf + 2);
  
  		orig = parse_object(r, &oid);
  		peeled = deref_tag_noverify(orig);
  
  		if (!peeled)
  			die("failed to load commit for input %s resulting in oid %s\n",
  			    buf.buf, oid_to_hex(&oid));
  
  		c = object_as_type(peeled, OBJ_COMMIT, 0);
  
  		if (!c)
  			die("failed to load commit for input %s resulting in oid %s\n",
  			    buf.buf, oid_to_hex(&oid));
  
  		switch (buf.buf[0]) {
  			case 'A':
  				oidcpy(&oid_A, &oid);
  				A = c;
  				break;
  
  			case 'B':
  				oidcpy(&oid_B, &oid);
  				B = c;
  				break;
  
  			case 'X':
  				commit_list_insert(c, &X);
  				ALLOC_GROW(X_array, X_nr + 1, X_alloc);
  				X_array[X_nr++] = c;
  				add_object_array(orig, NULL, &X_obj);
  				break;
  
  			case 'Y':
  				commit_list_insert(c, &Y);
  				ALLOC_GROW(Y_array, Y_nr + 1, Y_alloc);
  				Y_array[Y_nr++] = c;
  				break;
  
  			default:
  				die("unexpected start of line: %c", buf.buf[0]);
  		}
  	}
  	strbuf_release(&buf);
  
  	if (!strcmp(av[1], "ref_newer"))
  		printf("%s(A,B):%d\n", av[1], ref_newer(&oid_A, &oid_B));
  	else if (!strcmp(av[1], "in_merge_bases"))
  		printf("%s(A,B):%d\n", av[1], in_merge_bases(A, B));
  	else if (!strcmp(av[1], "in_merge_bases_many"))
  		printf("%s(A,X):%d\n", av[1], in_merge_bases_many(A, X_nr, X_array));
  	else if (!strcmp(av[1], "is_descendant_of"))
  		printf("%s(A,X):%d\n", av[1], repo_is_descendant_of(r, A, X));
  	else if (!strcmp(av[1], "get_merge_bases_many")) {
  		struct commit_list *list = get_merge_bases_many(A, X_nr, X_array);
  		printf("%s(A,X):\n", av[1]);
  		print_sorted_commit_ids(list);
  	} else if (!strcmp(av[1], "reduce_heads")) {
  		struct commit_list *list = reduce_heads(X);
  		printf("%s(X):\n", av[1]);
  		print_sorted_commit_ids(list);
  	} else if (!strcmp(av[1], "can_all_from_reach")) {
  		printf("%s(X,Y):%d\n", av[1], can_all_from_reach(X, Y, 1));
  	} else if (!strcmp(av[1], "can_all_from_reach_with_flag")) {
  		struct commit_list *iter = Y;
  
  		while (iter) {
  			iter->item->object.flags |= 2;
  			iter = iter->next;
  		}
  
  		printf("%s(X,_,_,0,0):%d\n", av[1], can_all_from_reach_with_flag(&X_obj, 2, 4, 0, 0));
  	} else if (!strcmp(av[1], "commit_contains")) {
  		struct ref_filter filter;
  		struct contains_cache cache;
  		init_contains_cache(&cache);
  
  		if (ac > 2 && !strcmp(av[2], "--tag"))
  			filter.with_commit_tag_algo = 1;
  		else
  			filter.with_commit_tag_algo = 0;
  
  		printf("%s(_,A,X,_):%d\n", av[1], commit_contains(&filter, A, X, &cache));
  	} else if (!strcmp(av[1], "get_reachable_subset")) {
  		const int reachable_flag = 1;
  		int i, count = 0;
  		struct commit_list *current;
  		struct commit_list *list = get_reachable_subset(X_array, X_nr,
  								Y_array, Y_nr,
  								reachable_flag);
  		printf("get_reachable_subset(X,Y)\n");
  		for (current = list; current; current = current->next) {
  			if (!(list->item->object.flags & reachable_flag))
  				die(_("commit %s is not marked reachable"),
  				    oid_to_hex(&list->item->object.oid));
  			count++;
  		}
  		for (i = 0; i < Y_nr; i++) {
  			if (Y_array[i]->object.flags & reachable_flag)
  				count--;
  		}
  
  		if (count < 0)
  			die(_("too many commits marked reachable"));
  
  		print_sorted_commit_ids(list);
  	}
  
  	exit(0);
  }
  