Add support for reloading plugins

src/controllers/commands/CommandController.cpp

@@ -3233,6 +3233,11 @@ bool CommandController::registerPluginCommand(const QString &commandName)
     };
     return true;
 }
+
+bool CommandController::unregisterPluginCommand(const QString &commandName)
+{
+    return this->commands_.erase(commandName) != 0;
+}
 void CommandController::registerCommand(const QString &commandName,
                                         CommandFunctionVariants commandFunction)
 {

src/controllers/commands/CommandController.hpp

@@ -44,6 +44,7 @@ public:
         std::unordered_map<QString, QString> context = {});
 
     bool registerPluginCommand(const QString &commandName);
+    bool unregisterPluginCommand(const QString &commandName);
 
 private:
     void load(Paths &paths);

src/controllers/plugins/PluginController.cpp

@@ -34,27 +34,32 @@ void PluginController::initialize(Settings &settings, Paths &paths)
     {
         if (info.isDir())
         {
-            // look for index.lua
             auto pluginDir = QDir(info.absoluteFilePath());
+            this->tryLoadFromDir(pluginDir);
+        }
+    }
+}
+bool PluginController::tryLoadFromDir(const QDir &pluginDir)
+{
+    // look for index.lua
     auto index = QFileInfo(pluginDir.filePath("index.lua"));
-            qCDebug(chatterinoLua)
-                << "trying" << info << "," << index << "at" << pluginDir;
+    qCDebug(chatterinoLua) << "looking for index.lua and info.json in"
+                           << pluginDir.path();
     if (!index.exists())
     {
         qCDebug(chatterinoLua)
             << "Missing index.lua in plugin directory" << pluginDir;
-                continue;
+        return false;
     }
-            qCDebug(chatterinoLua)
-                << "found index.lua, now looking for info.json!";
-            auto info = QFileInfo(pluginDir.filePath("info.json"));
-            if (!info.exists())
+    qCDebug(chatterinoLua) << "found index.lua, now looking for info.json!";
+    auto infojson = QFileInfo(pluginDir.filePath("info.json"));
+    if (!infojson.exists())
     {
         qCDebug(chatterinoLua)
             << "Missing info.json in plugin directory" << pluginDir;
-                continue;
+        return false;
     }
-            QFile infoFile(info.absoluteFilePath());
+    QFile infoFile(infojson.absoluteFilePath());
     infoFile.open(QIODevice::ReadOnly);
     auto everything = infoFile.readAll();
     auto doc = QJsonDocument::fromJson(everything);
@@ -62,12 +67,11 @@ void PluginController::initialize(Settings &settings, Paths &paths)
     {
         qCDebug(chatterinoLua)
             << "info.json root is not an object" << pluginDir;
-                continue;
+        return false;
     }
 
     this->load(index, pluginDir, PluginMeta(doc.object()));
-        }
-    }
+    return true;
 }
 
 void PluginController::load(QFileInfo index, QDir pluginDir, PluginMeta meta)
@@ -78,13 +82,31 @@ void PluginController::load(QFileInfo index, QDir pluginDir, PluginMeta meta)
     this->loadChatterinoLib(l);
 
     auto pluginName = pluginDir.dirName();
-    auto plugin = std::make_unique<Plugin>(pluginName, l, meta);
+    auto plugin = std::make_unique<Plugin>(pluginName, l, meta, pluginDir);
     this->plugins_.insert({pluginName, std::move(plugin)});
 
     luaL_dofile(l, index.absoluteFilePath().toStdString().c_str());
     qCInfo(chatterinoLua) << "Loaded" << pluginName << "plugin from" << index;
 }
 
+bool PluginController::reload(const QString &codename)
+{
+    auto it = this->plugins_.find(codename);
+    if (it == this->plugins_.end())
+    {
+        return false;
+    }
+    lua_close(it->second->state_);
+    for (const auto &[cmd, _] : it->second->ownedCommands)
+    {
+        getApp()->commands->unregisterPluginCommand(cmd);
+    }
+    QDir loadDir = it->second->loadDirectory_;
+    this->plugins_.erase(codename);
+    this->tryLoadFromDir(loadDir);
+    return true;
+}
+
 void PluginController::callEvery(const QString &functionName)
 {
     for (const auto &[name, plugin] : this->plugins_)

src/controllers/plugins/PluginController.hpp

@@ -47,9 +47,12 @@ class Plugin
 public:
     QString codename;
     PluginMeta meta;
-    Plugin(QString codename, lua_State *state, PluginMeta meta)
+
+    Plugin(QString codename, lua_State *state, PluginMeta meta,
+           const QDir &loadDirectory)
         : codename(std::move(codename))
         , meta(std::move(meta))
+        , loadDirectory_(loadDirectory)
         , state_(state)
     {
     }
@@ -71,6 +74,7 @@ public:
     }
 
 private:
+    QDir loadDirectory_;
     lua_State *state_;
 
     // maps command name -> function name
@@ -112,9 +116,12 @@ public:
         return this->plugins_;
     }
 
+    bool reload(const QString &codename);
+
 private:
     void load(QFileInfo index, QDir pluginDir, PluginMeta meta);
     void loadChatterinoLib(lua_State *l);
+    bool tryLoadFromDir(const QDir &pluginDir);
     std::map<QString, std::unique_ptr<Plugin>> plugins_;
 };
 

src/widgets/settingspages/PluginsPage.cpp

@@ -10,6 +10,7 @@
 #include <QFormLayout>
 #include <QGroupBox>
 #include <QLabel>
+#include <QPushButton>
 
 namespace chatterino {
 
@@ -47,6 +48,12 @@ PluginsPage::PluginsPage()
         homepage->setOpenExternalLinks(true);
 
         pl->addRow("Homepage", homepage);
+
+        auto *reload = new QPushButton("Reload");
+        QObject::connect(reload, &QPushButton::pressed, [=]() {
+            getApp()->plugins->reload(codename);
+        });
+        pl->addRow(reload);
     }
 }
 }  // namespace chatterino