Add a ChannelOptions table in the DB

And a way to retrieve its values, defaulting on the ServerOptions for unset
values.

src/database/database.cpp

@@ -49,6 +49,39 @@ db::IrcServerOptions Database::get_irc_server_options(const std::string& owner,
   }
 }
 
+db::IrcChannelOptions Database::get_irc_channel_options(const std::string& owner,
+                                                        const std::string& server,
+                                                        const std::string& channel)
+{
+  try {
+    auto options = litesql::select<db::IrcChannelOptions>(Database::get_db(),
+                                                         db::IrcChannelOptions::Owner == owner &&
+                                                         db::IrcChannelOptions::Server == server &&
+                                                         db::IrcChannelOptions::Channel == channel).one();
+    return options;
+  } catch (const litesql::NotFound& e) {
+    db::IrcChannelOptions options(Database::get_db());
+    options.owner = owner;
+    options.server = server;
+    options.channel = channel;
+    return options;
+  }
+}
+
+db::IrcChannelOptions Database::get_irc_channel_options_with_server_default(const std::string& owner,
+                                                                            const std::string& server,
+                                                                            const std::string& channel)
+{
+  auto coptions = Database::get_irc_channel_options(owner, server, channel);
+  auto soptions = Database::get_irc_server_options(owner, server);
+  if (coptions.encodingIn.value().empty())
+    coptions.encodingIn = soptions.encodingIn;
+  if (coptions.encodingOut.value().empty())
+    coptions.encodingOut = soptions.encodingOut;
+
+  return coptions;
+}
+
 void Database::close()
 {
   Database::db.reset(nullptr);