Add plugin dependency constants (#458)

Adds dependency constants for plugins so mods can rely on plugins without always producing script errors when the plugin is missing

NorthstarDLL/mods/modmanager.cpp

@@ -104,6 +104,7 @@ Mod::Mod(fs::path modDir, char* jsonBuf)
 	ParseScripts(modJson);
 	ParseLocalization(modJson);
 	ParseDependencies(modJson);
+	ParsePluginDependencies(modJson);
 	ParseInitScript(modJson);
 
 	// A mod is remote if it's located in the remote mods folder
@@ -483,6 +484,28 @@ void Mod::ParseDependencies(rapidjson_document& json)
 	}
 }
 
+void Mod::ParsePluginDependencies(rapidjson_document& json)
+{
+	if (!json.HasMember("PluginDependencies"))
+		return;
+
+	if (!json["PluginDependencies"].IsArray())
+	{
+		spdlog::warn("'PluginDependencies' field is not an object, skipping...");
+		return;
+	}
+
+	for (auto& name : json["PluginDependencies"].GetArray())
+	{
+		if (!name.IsString())
+			continue;
+
+		spdlog::info("Plugin Constant {} defined by {}", name.GetString(), Name);
+
+		PluginDependencyConstants.push_back(name.GetString());
+	}
+}
+
 void Mod::ParseInitScript(rapidjson_document& json)
 {
 	if (!json.HasMember("InitScript"))
@@ -688,6 +711,11 @@ void ModManager::LoadMods()
 				m_DependencyConstants.emplace(pair);
 		}
 
+		for (std::string& dependency : mod.PluginDependencyConstants)
+		{
+			m_PluginDependencyConstants.insert(dependency);
+		}
+
 		if (m_bHasEnabledModsCfg && m_EnabledModsCfg.HasMember(mod.Name.c_str()))
 			mod.m_bEnabled = m_EnabledModsCfg[mod.Name.c_str()].IsTrue();
 		else

NorthstarDLL/mods/modmanager.h

@@ -7,6 +7,7 @@
 #include <string>
 #include <vector>
 #include <filesystem>
+#include <unordered_set>
 
 const std::string MOD_FOLDER_SUFFIX = "\\mods";
 const std::string THUNDERSTORE_MOD_FOLDER_SUFFIX = "\\packages";
@@ -124,6 +125,7 @@ class Mod
 	// hashed with STR_HASH
 
 	std::unordered_map<std::string, std::string> DependencyConstants;
+	std::vector<std::string> PluginDependencyConstants;
 
   public:
 	Mod(fs::path modPath, char* jsonBuf);
@@ -134,6 +136,7 @@ class Mod
 	void ParseScripts(rapidjson_document& json);
 	void ParseLocalization(rapidjson_document& json);
 	void ParseDependencies(rapidjson_document& json);
+	void ParsePluginDependencies(rapidjson_document& json);
 	void ParseInitScript(rapidjson_document& json);
 };
 
@@ -160,6 +163,7 @@ class ModManager
 	std::vector<Mod> m_LoadedMods;
 	std::unordered_map<std::string, ModOverrideFile> m_ModFiles;
 	std::unordered_map<std::string, std::string> m_DependencyConstants;
+	std::unordered_set<std::string> m_PluginDependencyConstants;
 
   public:
 	ModManager();

NorthstarDLL/plugins/plugins.cpp

@@ -170,6 +170,15 @@ std::optional<Plugin> PluginManager::LoadPlugin(fs::path path, PluginInitFuncs*
 		plugin.dependencyName = plugin.name;
 	}
 
+	if (std::find_if(
+			plugin.dependencyName.begin(),
+			plugin.dependencyName.end(),
+			[&](char c) -> bool { return !((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || c == '_'); }) !=
+		plugin.dependencyName.end())
+	{
+		NS::log::PLUGINSYS->warn("Dependency string \"{}\" in {} is not valid a squirrel constant!", plugin.dependencyName, plugin.name);
+	}
+
 	plugin.init_sqvm_client = (PLUGIN_INIT_SQVM_TYPE)GetProcAddress(pluginLib, "PLUGIN_INIT_SQVM_CLIENT");
 	plugin.init_sqvm_server = (PLUGIN_INIT_SQVM_TYPE)GetProcAddress(pluginLib, "PLUGIN_INIT_SQVM_SERVER");
 	plugin.inform_sqvm_created = (PLUGIN_INFORM_SQVM_CREATED_TYPE)GetProcAddress(pluginLib, "PLUGIN_INFORM_SQVM_CREATED");

NorthstarDLL/squirrel/squirrel.cpp

@@ -264,6 +264,13 @@ template <ScriptContext context> void SquirrelManager<context>::VMCreated(CSquir
 		defconst(m_pSQVM, pair.first.c_str(), bWasFound);
 	}
 
+	auto loadedPlugins = &g_pPluginManager->m_vLoadedPlugins;
+	for (const auto& pluginName : g_pModManager->m_PluginDependencyConstants)
+	{
+		auto f = [&](Plugin plugin) -> bool { return plugin.dependencyName == pluginName; };
+		defconst(m_pSQVM, pluginName.c_str(), std::find_if(loadedPlugins->begin(), loadedPlugins->end(), f) != loadedPlugins->end());
+	}
+
 	defconst(m_pSQVM, "MAX_FOLDER_SIZE", GetMaxSaveFolderSize() / 1024);
 
 	// define squirrel constants for northstar(.dll) version