Declarative plugin management (#2180)

* Declarative plugin management

Allow declaring `plugin` entries in the hyprland configuration.

Plugins will be loaded if an entry is added and unloaded if that entry
is removed.

* Replace pointers with copying in updateconfigPlugins

* Include which plugin was declared twice in error

src/Compositor.cpp

@@ -402,6 +402,7 @@ void CCompositor::initManagers(eManagersInitStage stage) {
 
             Debug::log(LOG, "Creating the PluginSystem!");
             g_pPluginSystem = std::make_unique<CPluginSystem>();
+            g_pConfigManager->handlePluginLoads();
         } break;
         default: UNREACHABLE();
     }

src/config/ConfigManager.cpp

@@ -1105,6 +1105,15 @@ void CConfigManager::handleEnv(const std::string& command, const std::string& va
     }
 }
 
+void CConfigManager::handlePlugin(const std::string& command, const std::string& path) {
+    if (std::find(m_vDeclaredPlugins.begin(), m_vDeclaredPlugins.end(), path) != m_vDeclaredPlugins.end()) {
+        parseError = "plugin '" + path + "' declared twice";
+        return;
+    }
+
+    m_vDeclaredPlugins.push_back(path);
+}
+
 std::string CConfigManager::parseKeyword(const std::string& COMMAND, const std::string& VALUE, bool dynamic) {
     if (dynamic) {
         parseError      = "";
@@ -1151,6 +1160,8 @@ std::string CConfigManager::parseKeyword(const std::string& COMMAND, const std::
         handleBindWS(COMMAND, VALUE);
     else if (COMMAND.find("env") == 0)
         handleEnv(COMMAND, VALUE);
+    else if (COMMAND.find("plugin") == 0)
+        handlePlugin(COMMAND, VALUE);
     else {
         configSetValueSafe(currentCategory + (currentCategory == "" ? "" : ":") + COMMAND, VALUE);
         needsLayoutRecalc = 2;
@@ -1303,6 +1314,7 @@ void CConfigManager::loadConfigLoadVars() {
     m_dBlurLSNamespaces.clear();
     boundWorkspaces.clear();
     setDefaultAnimationVars(); // reset anims
+    m_vDeclaredPlugins.clear();
 
     // paths
     configPaths.clear();
@@ -1441,6 +1453,9 @@ void CConfigManager::loadConfigLoadVars() {
 
     // Reset no monitor reload
     m_bNoMonitorReload = false;
+
+    // update plugins
+    handlePluginLoads();
 }
 
 void CConfigManager::tick() {
@@ -1954,6 +1969,31 @@ void CConfigManager::addExecRule(const SExecRequestedRule& rule) {
     execRequestedRules.push_back(rule);
 }
 
+void CConfigManager::handlePluginLoads() {
+    if (g_pPluginSystem == nullptr)
+        return;
+
+    bool pluginsChanged = false;
+    auto failedPlugins  = g_pPluginSystem->updateConfigPlugins(m_vDeclaredPlugins, pluginsChanged);
+
+    if (!failedPlugins.empty()) {
+        std::stringstream error;
+        error << "Failed to load the following plugins:";
+
+        for (auto path : failedPlugins) {
+            error << "\n" << path;
+        }
+
+        g_pHyprError->queueCreate(error.str(), CColor(1.0, 50.0 / 255.0, 50.0 / 255.0, 1.0));
+    }
+
+    if (pluginsChanged) {
+        g_pHyprError->destroy();
+        m_bForceReload = true;
+        tick();
+    }
+}
+
 ICustomConfigValueData::~ICustomConfigValueData() {
     ; // empty
 }

src/config/ConfigManager.hpp

@@ -182,6 +182,8 @@ class CConfigManager {
 
     void                      addExecRule(const SExecRequestedRule&);
 
+    void                      handlePluginLoads();
+
     std::string               configCurrentPath;
 
   private:
@@ -203,6 +205,7 @@ class CConfigManager {
 
     std::vector<SExecRequestedRule>                                                            execRequestedRules; // rules requested with exec, e.g. [workspace 2] kitty
 
+    std::vector<std::string>                                                                   m_vDeclaredPlugins;
     std::unordered_map<HANDLE, std::unique_ptr<std::unordered_map<std::string, SConfigValue>>> pluginConfigs; // stores plugin configs
 
     bool                                                                                       isFirstLaunch = true; // For exec-once
@@ -250,6 +253,7 @@ class CConfigManager {
     void         handleBlurLS(const std::string&, const std::string&);
     void         handleBindWS(const std::string&, const std::string&);
     void         handleEnv(const std::string&, const std::string&);
+    void         handlePlugin(const std::string&, const std::string&);
 };
 
 inline std::unique_ptr<CConfigManager> g_pConfigManager;

src/hyprerror/HyprError.cpp

@@ -33,7 +33,6 @@ void CHyprError::queueCreate(std::string message, const CColor& color) {
 
 void CHyprError::createQueued() {
     if (m_bIsCreated) {
-        m_bQueuedDestroy = false;
         m_tTexture.destroyTexture();
     }
 
@@ -171,4 +170,6 @@ void CHyprError::draw() {
 void CHyprError::destroy() {
     if (m_bIsCreated)
         m_bQueuedDestroy = true;
+    else
+        m_szQueued = "";
 }

src/plugins/PluginSystem.cpp

@@ -119,6 +119,35 @@ void CPluginSystem::unloadAllPlugins() {
         unloadPlugin(p.get(), false); // Unload remaining plugins gracefully
 }
 
+std::vector<std::string> CPluginSystem::updateConfigPlugins(const std::vector<std::string>& plugins, bool& changed) {
+    std::vector<std::string> failures;
+
+    // unload all plugins that are no longer present
+    for (auto& p : m_vLoadedPlugins | std::views::reverse) {
+        if (p->m_bLoadedWithConfig && std::find(plugins.begin(), plugins.end(), p->path) == plugins.end()) {
+            Debug::log(LOG, "Unloading plugin %s which is no longer present in config", p->path.c_str());
+            unloadPlugin(p.get(), false);
+            changed = true;
+        }
+    }
+
+    // load all new plugins
+    for (auto& path : plugins) {
+        if (std::find_if(m_vLoadedPlugins.begin(), m_vLoadedPlugins.end(), [&](const auto& other) { return other->path == path; }) == m_vLoadedPlugins.end()) {
+            Debug::log(LOG, "Loading plugin %s which is now present in config", path.c_str());
+            const auto plugin = loadPlugin(path);
+
+            if (plugin) {
+                plugin->m_bLoadedWithConfig = true;
+                changed                     = true;
+            } else
+                failures.push_back(path);
+        }
+    }
+
+    return failures;
+}
+
 CPlugin* CPluginSystem::getPluginByPath(const std::string& path) {
     for (auto& p : m_vLoadedPlugins) {
         if (p->path == path)

src/plugins/PluginSystem.hpp

@@ -15,6 +15,8 @@ class CPlugin {
 
     std::string                                            path = "";
 
+    bool                                                   m_bLoadedWithConfig = false;
+
     HANDLE                                                 m_pHandle = nullptr;
 
     std::vector<IHyprLayout*>                              registeredLayouts;
@@ -27,14 +29,15 @@ class CPluginSystem {
   public:
     CPluginSystem();
 
-    CPlugin*              loadPlugin(const std::string& path);
-    void                  unloadPlugin(const CPlugin* plugin, bool eject = false);
-    void                  unloadAllPlugins();
-    CPlugin*              getPluginByPath(const std::string& path);
-    CPlugin*              getPluginByHandle(HANDLE handle);
-    std::vector<CPlugin*> getAllPlugins();
+    CPlugin*                 loadPlugin(const std::string& path);
+    void                     unloadPlugin(const CPlugin* plugin, bool eject = false);
+    void                     unloadAllPlugins();
+    std::vector<std::string> updateConfigPlugins(const std::vector<std::string>& plugins, bool& changed);
+    CPlugin*                 getPluginByPath(const std::string& path);
+    CPlugin*                 getPluginByHandle(HANDLE handle);
+    std::vector<CPlugin*>    getAllPlugins();
 
-    bool                  m_bAllowConfigVars = false;
+    bool                     m_bAllowConfigVars = false;
 
   private:
     std::vector<std::unique_ptr<CPlugin>> m_vLoadedPlugins;