add set-next-item shell command

src/ServerShell.cc

@@ -145,6 +145,8 @@ Proxy commands (these will only work when exactly one client is connected):\n\
     responds as if the function was called (with the given return value), but\n\
     does not send the code to the client. To stop blocking function calls, omit\n\
     the return value.\n\
+  set-next-item <code>\n\
+    Set the next item to be dropped as if the client had run the $item command.\n\
   close-idle-sessions\n\
     Closes all sessions that don\'t have a client and server connected.\n\
 ");
@@ -400,6 +402,38 @@ Proxy commands (these will only work when exactly one client is connected):\n\
       session->function_call_return_value = stoul(command_args);
     }
 
+  } else if (command_name == "set-next-item") {
+    auto session = this->get_proxy_session();
+
+    if (session->version == GameVersion::BB) {
+      throw runtime_error("proxy session is BB");
+    }
+    if (!session->is_in_game) {
+      throw runtime_error("proxy session is not in a game");
+    }
+    if (session->lobby_client_id != session->leader_client_id) {
+      throw runtime_error("proxy session is not game leader");
+    }
+
+    string data = parse_data_string(command_args);
+    if (data.size() < 2) {
+      throw runtime_error("data too short");
+    }
+    if (data.size() > 16) {
+      throw runtime_error("data too long");
+    }
+
+    session->next_drop_item.clear();
+    if (data.size() <= 12) {
+      memcpy(&session->next_drop_item.data.data1, data.data(), data.size());
+    } else {
+      memcpy(&session->next_drop_item.data.data1, data.data(), 12);
+      memcpy(&session->next_drop_item.data.data2, data.data() + 12, data.size() - 12);
+    }
+
+    string name = name_for_item(session->next_drop_item.data, true);
+    send_text_message(session->client_channel, u"$C7Next drop:\n" + decode_sjis(name));
+
   } else if (command_name == "close-idle-sessions") {
     size_t count = this->state->proxy_server->delete_disconnected_sessions();
     fprintf(stderr, "%zu sessions closed\n", count);

src/StaticGameData.cc

@@ -1610,7 +1610,7 @@ string name_for_item(const ItemData& item, bool include_color_codes) {
         // center and right PBs from the list, and the left PB is then used as
         // an index into this modified list to determine the actual left PB.
         // Here, we don't construct a temporary list and instead just skip the
-        // center and right PB values with a loop instead.
+        // center and right PB values with a loop.
         uint8_t actual_left_pb = 0;
         for (;;) {
           if ((actual_left_pb == center_pb) || (actual_left_pb == right_pb)) {