From edf013952ca2d110f190dc8cd16e5529846656e4 Mon Sep 17 00:00:00 2001
From: uniboi <64006268+uniboi@users.noreply.github.com>
Date: Sun, 4 Feb 2024 02:14:46 +0100
Subject: Plugin interfaces (plugins v4) (#615)

Replaces the current plugin api with source interfaces.

- backwards compatible
- no more json in binaries (wtf)
- does not rely on structs from third party libraries (wtf)
- actually initializes variables
- no more basically unused classes

The launcher exposes almost everything required by plugins in interfaces that allow for backwards compatibility.
The only thing that's passed to a plugin directly is the northstar dll HWND and a struct of data that's different for each plugin.
---
 primedev/plugins/pluginmanager.cpp | 184 +++++++++++++++++++++++++++++++++++++
 1 file changed, 184 insertions(+)
 create mode 100644 primedev/plugins/pluginmanager.cpp

(limited to 'primedev/plugins/pluginmanager.cpp')

diff --git a/primedev/plugins/pluginmanager.cpp b/primedev/plugins/pluginmanager.cpp
new file mode 100644
index 00000000..718e6956
--- /dev/null
+++ b/primedev/plugins/pluginmanager.cpp
@@ -0,0 +1,184 @@
+#include "pluginmanager.h"
+
+#include <regex>
+#include "plugins.h"
+#include "config/profile.h"
+#include "core/convar/concommand.h"
+
+PluginManager* g_pPluginManager;
+
+const std::vector<Plugin>& PluginManager::GetLoadedPlugins() const
+{
+	return this->plugins;
+}
+
+const std::optional<Plugin> PluginManager::GetPlugin(HMODULE handle) const
+{
+	for (const Plugin& plugin : GetLoadedPlugins())
+		if (plugin.m_handle == handle)
+			return plugin;
+	return std::nullopt;
+}
+
+void PluginManager::LoadPlugin(fs::path path, bool reloaded)
+{
+	Plugin plugin = Plugin(path.string());
+
+	if (!plugin.IsValid())
+	{
+		NS::log::PLUGINSYS->warn("Unloading invalid plugin '{}'", path.string());
+		plugin.Unload();
+		return;
+	}
+
+	plugins.push_back(plugin);
+	plugin.Init(reloaded);
+}
+
+inline void FindPlugins(fs::path pluginPath, std::vector<fs::path>& paths)
+{
+	// ensure dirs exist
+	if (!fs::exists(pluginPath) || !fs::is_directory(pluginPath))
+	{
+		return;
+	}
+
+	for (const fs::directory_entry& entry : fs::directory_iterator(pluginPath))
+	{
+		if (fs::is_regular_file(entry) && entry.path().extension() == ".dll")
+			paths.emplace_back(entry.path());
+	}
+}
+
+bool PluginManager::LoadPlugins(bool reloaded)
+{
+	if (strstr(GetCommandLineA(), "-noplugins") != NULL)
+	{
+		NS::log::PLUGINSYS->warn("-noplugins detected; skipping loading plugins");
+		return false;
+	}
+
+	fs::create_directories(GetThunderstoreModFolderPath());
+
+	std::vector<fs::path> paths;
+
+	pluginPath = GetNorthstarPrefix() + "\\plugins";
+
+	fs::path libPath = fs::absolute(pluginPath + "\\lib");
+	if (fs::exists(libPath) && fs::is_directory(libPath))
+		AddDllDirectory(libPath.wstring().c_str());
+
+	FindPlugins(pluginPath, paths);
+
+	// Special case for Thunderstore mods dir
+	std::filesystem::directory_iterator thunderstoreModsDir = fs::directory_iterator(GetThunderstoreModFolderPath());
+	// Set up regex for `AUTHOR-MOD-VERSION` pattern
+	std::regex pattern(R"(.*\\([a-zA-Z0-9_]+)-([a-zA-Z0-9_]+)-(\d+\.\d+\.\d+))");
+	for (fs::directory_entry dir : thunderstoreModsDir)
+	{
+		fs::path pluginsDir = dir.path() / "plugins";
+		// Use regex to match `AUTHOR-MOD-VERSION` pattern
+		if (!std::regex_match(dir.path().string(), pattern))
+		{
+			spdlog::warn("The following directory did not match 'AUTHOR-MOD-VERSION': {}", dir.path().string());
+			continue; // skip loading package that doesn't match
+		}
+
+		fs::path libDir = fs::absolute(pluginsDir / "lib");
+		if (fs::exists(libDir) && fs::is_directory(libDir))
+			AddDllDirectory(libDir.wstring().c_str());
+
+		FindPlugins(pluginsDir, paths);
+	}
+
+	if (paths.empty())
+	{
+		NS::log::PLUGINSYS->warn("Could not find any plugins. Skipped loading plugins");
+		return false;
+	}
+
+	for (fs::path path : paths)
+	{
+		LoadPlugin(path, reloaded);
+	}
+
+	InformAllPluginsInitialized();
+
+	return true;
+}
+
+void PluginManager::ReloadPlugins()
+{
+	for (const Plugin& plugin : this->GetLoadedPlugins())
+	{
+		plugin.Unload();
+	}
+
+	this->plugins.clear();
+	this->LoadPlugins(true);
+}
+
+void PluginManager::RemovePlugin(HMODULE handle)
+{
+	for (size_t i = 0; i < plugins.size(); i++)
+	{
+		Plugin* plugin = &plugins[i];
+		if (plugin->m_handle == handle)
+		{
+			plugins.erase(plugins.begin() + i);
+			return;
+		}
+	}
+}
+
+void PluginManager::InformAllPluginsInitialized() const
+{
+	for (const Plugin& plugin : GetLoadedPlugins())
+	{
+		plugin.Finalize();
+	}
+}
+
+void PluginManager::InformSqvmCreated(CSquirrelVM* sqvm) const
+{
+	for (const Plugin& plugin : GetLoadedPlugins())
+	{
+		plugin.OnSqvmCreated(sqvm);
+	}
+}
+
+void PluginManager::InformSqvmDestroying(CSquirrelVM* sqvm) const
+{
+	for (const Plugin& plugin : GetLoadedPlugins())
+	{
+		plugin.OnSqvmDestroying(sqvm);
+	}
+}
+
+void PluginManager::InformDllLoad(HMODULE module, fs::path path) const
+{
+	std::string fn = path.filename().string(); // without this the string gets freed immediately lmao
+	const char* filename = fn.c_str();
+	for (const Plugin& plugin : GetLoadedPlugins())
+	{
+		plugin.OnLibraryLoaded(module, filename);
+	}
+}
+
+void PluginManager::RunFrame() const
+{
+	for (const Plugin& plugin : GetLoadedPlugins())
+	{
+		plugin.RunFrame();
+	}
+}
+
+void ConCommand_reload_plugins(const CCommand& args)
+{
+	g_pPluginManager->ReloadPlugins();
+}
+
+ON_DLL_LOAD_RELIESON("engine.dll", PluginManager, ConCommand, (CModule module))
+{
+	RegisterConCommand("reload_plugins", ConCommand_reload_plugins, "reloads plugins", FCVAR_NONE);
+}
-- 
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