Created the channel.cpp command

src/commands/channel.cpp

@@ -0,0 +1,28 @@
+#include "channel.h"
+#include "api/util.h"
+
+void channel::execute(sql::Connection &con, dpp::cluster &bot, const dpp::slashcommand_t &event) {
+    std::string cmd = event.command.get_command_interaction().options[0].name;
+
+    sql::ResultSet *res = util::getResultSet(con, "SELECT * FROM `channels` WHERE `channelId` = ? AND `guildId` = ?",
+                                             {event.command.channel_id.str(), event.command.guild_id.str()});
+
+    if (!res->next()) {
+        util::sendError(event, "This channel is not a global chat!");
+        return;
+    }
+
+    std::string value = std::get<std::string>(event.command.get_command_interaction().options[0].options[0].value);
+    if (cmd == "language") {
+        util::executeQuery(con, "UPDATE `channels` SET `langCode` = ? WHERE `channelId` = ? AND `guildId` = ?",
+                           {value, event.command.channel_id.str(), event.command.guild_id.str()});
+        util::sendSuccess(event, "The language of this channel has been updated.");
+    } else if (cmd == "topic") {
+        util::executeQuery(con, "UPDATE `channels` SET `topicId` = ? WHERE `channelId` = ? AND `guildId` = ?",
+                           {value, event.command.channel_id.str(), event.command.guild_id.str()});
+        util::sendSuccess(event, "The topic of this channel has been updated.");
+    } else {
+        util::sendError(event, "Invalid subcommand.");
+    }
+
+}