Implemented "Clear All User Metadata" feature.

resources/report/js/script.js

@@ -306,7 +306,16 @@ function redatePlugins(evt) {
     //showMessageBox('info', 'Redate Plugins', 'Plugins were successfully redated.');
 }
 function clearAllMetadata(evt) {
-    showMessageDialog('Clear All Metadata', 'Are you sure you want to clear all existing user-added metadata from all plugins?');
+    showMessageDialog('Clear All Metadata', 'Are you sure you want to clear all existing user-added metadata from all plugins?', function(result){
+        if (result) {
+            loot.query('clearAllMetadata').then(function(result){
+                /* Need to also empty the UI-side user metadata. */
+                loot.game.plugins.forEach(function(plugin){
+                    plugin.userlist = undefined;
+                });
+            }).catch(processCefError);
+        }
+    });
 }
 function handlePluginDrop(evt) {
     evt.stopPropagation();

src/backend/game.cpp

@@ -116,6 +116,11 @@ namespace loot {
         uout.close();
     }
 
+    void MetadataList::clear() {
+        plugins.clear();
+        messages.clear();
+    }
+
     bool MetadataList::operator == (const MetadataList& rhs) const {
         if (this->plugins.size() != rhs.plugins.size() || this->messages.size() != rhs.messages.size()) {
             BOOST_LOG_TRIVIAL(info) << "Metadata edited for some plugin, new and old userlists differ in size.";

src/backend/game.h

@@ -57,6 +57,7 @@ namespace loot {
     public:
         void Load(const boost::filesystem::path& filepath);
         void Save(const boost::filesystem::path& filepath);
+        void clear();
 
         bool operator == (const MetadataList& rhs) const;  //Compares content.
 

src/gui/handler.cpp

@@ -130,6 +130,11 @@ namespace loot {
             callback->Success("");
             return true;
         }
+        else if (request == "clearAllMetadata") {
+            g_app_state.CurrentGame().userlist.clear();
+            callback->Success("");
+            return true;
+        }
         else {
             // May be a request with arguments.
             YAML::Node req;