    /*
     *  call-seq:
     *     FSDirectory.new(/path/to/index/, create = false)
     *
     *  Create a new FSDirectory at +/path/to/index/+ which must be a valid path
     *  on your file system. If it doesn't exist it will be created. You can also
     *  specify the +create+ parameter. If +create+ is true the FSDirectory will
     *  be refreshed as new. That is to say, any existing files in the directory
     *  will be deleted. The default value for +create+ is false.
     *
     *  path::   path to index directory. Must be a valid path on your system
     *  create:: set to true if you want any existing files in the directory to be
     *           deleted
     */
    static VALUE
    frt_fsdir_new(int argc, VALUE *argv, VALUE klass)
    {
        VALUE self, rpath, rcreate;
        Store *store;
        bool create;

        rb_scan_args(argc, argv, "11", &rpath, &rcreate);
        StringValue(rpath);
        create = RTEST(rcreate);
        if (create) {
            frt_create_dir(rpath);
        }
        if (!rb_funcall(rb_cFile, id_is_directory, 1, rpath)) {
            rb_raise(rb_eIOError, "No directory <%s> found. Use :create => true"
                     " to create one.", rs2s(rpath));
        }
        store = open_fs_store(rs2s(rpath));
        if (create) store->clear_all(store);
        if ((self = object_get(store)) == Qnil) {
            self = Data_Wrap_Struct(klass, NULL, &frt_dir_free, store);
            object_add(store, self);
            rb_ivar_set(self, id_ref_cnt, INT2FIX(0));
        }
        else {
            int ref_cnt = FIX2INT(rb_ivar_get(self, id_ref_cnt)) + 1;
            rb_ivar_set(self, id_ref_cnt, INT2FIX(ref_cnt));
            DEREF(store);
        }
        return self;
    }