01-08

CMakeLists.txt

@@ -34,3 +34,4 @@ add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/src/01_basics/04_adding_files")
 add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/src/01_basics/05_webhooks")
 add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/src/01_basics/06_callbacks")
 add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/src/01_basics/07_cache")
+add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/src/01_basics/08_listening_to_messages")

src/01_basics/08_listening_to_messages/CMakeLists.txt

@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.28)
+project(dppbots)
+set(example_name "01_08_listening_to_messages")
+message("Setting up ${example_name}")
+add_executable(${example_name} "${CMAKE_CURRENT_SOURCE_DIR}/src/main.cpp")
+target_include_directories(${example_name} PUBLIC
+    "${dpp_SOURCE_DIR}/include"
+    "${dotenv-cpp_SOURCE_DIR}/include/laserpants"
+
+)
+target_link_libraries(${example_name}
+    dpp
+    dotenv
+)
+SET_OUTPUT_NAMES(${example_name})

src/01_basics/08_listening_to_messages/src/main.cpp

@@ -0,0 +1,44 @@
+#include <cluster.h>
+#include <dispatcher.h>
+#include <intents.h>
+
+#include <cstdlib>
+#include <iostream>
+
+#include "dotenv.h"
+
+// Please note:
+// Discord made message content a privileged intent in August 2022.
+// Directly pulling the message content and using prefixes for commands is
+// generally an older technique for running bot commands. Nowadays it is
+// recommanded to use slash commands, which is covered in 02_01.
+
+int main() {
+    // Load the .env into the environment
+    dotenv::init();
+    // Make sure the DISCORD_TOKEN env var exists
+    if (!std::getenv("DISCORD_TOKEN")) {
+        std::cout << "Failed to get DISCORD_TOKEN from .env or environment"
+                  << std::endl;
+        exit(EXIT_FAILURE);
+    }
+    // Load in the bot token from the env
+    std::string botToken = std::getenv("DISCORD_TOKEN");
+
+    // Create the bot
+    dpp::cluster bot(botToken, dpp::i_default_intents | dpp::i_message_content);
+
+    // Create a lambda for the on_message_create event.
+    bot.on_message_create([](const dpp::message_create_t& event) {
+        // Filter through the message content
+        if (event.msg.content.find("bad word") != std::string::npos) {
+            event.reply("That is not allowed here. Please, mind you language.",
+                        true);
+        }
+    });
+
+    // Start the bot
+    bot.start(dpp::st_wait);
+
+    return 0;
+}