feat: add support for extra configuration options in ProxyGroupConfig

src/config/binding.h

@@ -84,6 +84,12 @@ namespace toml
                 throw serialization_error(format_error("Proxy Group must contains at least one of proxy match rule or provider!", v.location(), "here"), v.location());
             if(v.contains("disable-udp"))
                 conf.DisableUdp = find_or(v, "disable-udp", conf.DisableUdp.get());
+            if(v.contains("extra"))
+            {
+                const auto& extra_table = toml::find<toml::table>(v, "extra");
+                for(const auto& [k, val] : extra_table)
+                    conf.Extras[k] = toml::format(val);
+            }
             return conf;
         }
     };
@@ -254,6 +260,15 @@ namespace INIBinding
                         conf.UsingProvider.reserve(conf.UsingProvider.size() + list.size());
                         std::move(list.begin(), list.end(), std::back_inserter(conf.UsingProvider));
                     }
+                    else if(startsWith(vArray[i], "!!"))
+                    {
+                        std::string keyval = vArray[i].substr(2);
+                        auto eqpos = keyval.find('=');
+                        if(eqpos != std::string::npos)
+                            conf.Extras[keyval.substr(0, eqpos)] = keyval.substr(eqpos + 1);
+                        else
+                            conf.Extras[keyval] = "true";
+                    }
                     else
                         conf.Proxies.emplace_back(std::move(vArray[i]));
                 }

src/config/proxygroup.h

@@ -35,6 +35,7 @@ struct ProxyGroupConfig
     Boolean DisableUdp;
     Boolean Persistent;
     Boolean EvaluateBeforeUse;
+    string_map Extras;
 
     String TypeStr() const
     {

src/generator/config/subexport.cpp

@@ -808,6 +808,8 @@ proxyToClash(std::vector<Proxy> &nodes, YAML::Node &yamlnode, const ProxyGroupCo
         }
         if (!x.DisableUdp.is_undef())
             singlegroup["disable-udp"] = x.DisableUdp.get();
+        for (const auto &[key, value] : x.Extras)
+            singlegroup[key] = yamlScalarFromString(value);
 
         for (const auto &y: x.Proxies)
             groupGenerate(y, nodelist, filtered_nodelist, true, ext);