Config: Create config directory if it was deleted while runtime

In few previous commit a fix for incorrect directory if tool was
installed by dpkg was added, now this patch adds on top of that - if
users have deleted files, we probably don't want to screw their
directory wherever they ran D1GraphicsTool in by saving config file upon
closing the app here, so it creates the path once again and writes
config here.

source/config.cpp

@@ -9,7 +9,7 @@
 #include <QStandardPaths>
 
 static QJsonObject theConfig;
-QString Config::jsonFilePath;
+QString Config::dirPath;
 
 /**
  * @brief Loads current configuration from the config .json file
@@ -27,7 +27,7 @@ void Config::loadConfiguration()
     }
 
     // add filename to the absolute path
-    jsonFilePath += "/D1GraphicsTool.config.json";
+    QString jsonFilePath = dirPath + "/D1GraphicsTool.config.json";
 
     bool configurationModified = false;
 
@@ -60,10 +60,20 @@ void Config::loadConfiguration()
 
 /**
  * @brief Stores current configuration in the config .json file
+ *
+ * This function stores current configuration in the config .json
+ * file, and also - if user has deleted his app's config path durrent
+ * runtime, it will try to create it once again
  */
 void Config::storeConfiguration()
 {
-    QFile saveJson(jsonFilePath);
+    // create directories on the path upon closing program
+    if (!Config::createDirectoriesOnPath()) {
+        qDebug() << "Couldn't resolve path for the config file. Configuration file won't be saved.";
+        return;
+    }
+
+    QFile saveJson(dirPath + "/D1GraphicsTool.config.json");
     saveJson.open(QIODevice::WriteOnly);
     QJsonDocument saveDoc(theConfig);
     saveJson.write(saveDoc.toJson());
@@ -76,16 +86,13 @@ void Config::storeConfiguration()
  * This function creates directories on certain path. Path location depends on
  * if user is working on Windows or Mac/Linux.
  *
- * If the user works on Windows, it will save it under AppData/.config/[...].
- * On any other OS it will save it under /home/user/.config/diasurgical/[...]
- *
  * @return Returns true if path has been created or already existed - false otherwise
  */
 bool Config::createDirectoriesOnPath()
 {
-    jsonFilePath = QStandardPaths::writableLocation(QStandardPaths::AppConfigLocation);
+    dirPath = QStandardPaths::writableLocation(QStandardPaths::AppConfigLocation);
 
-    return QDir().mkpath(jsonFilePath);
+    return QDir().mkpath(dirPath);
 }
 
 /**

source/config.h

@@ -12,5 +12,5 @@ class Config {
 private:
     static bool createDirectoriesOnPath();
 
-    static QString jsonFilePath;
+    static QString dirPath;
 };