Support XDG Base Directory Specification

Configuration files and cookies are now stored in "$XDG_CONFIG_HOME/lgogdownloader"
if $XDG_CONFIG_HOME is not set it will use "$HOME/.config/lgogdownloader"

XML files are now stored in "$XDG_CACHE_HOME/lgogdownloader/xml"
if $XDG_CACHE_HOME is not set it will use "$HOME/.cache/lgogdownloader/xml"

include/config.h

@@ -41,7 +41,7 @@ class Config
         std::string sToken;
         std::string sSecret;
         std::string sVersionString;
-        std::string sHome;
+        std::string sConfigDirectory;
         std::string sCookiePath;
         std::string sConfigFilePath;
         unsigned int iInstallerType;

main.cpp

@@ -33,12 +33,29 @@ int main(int argc, char *argv[])
 {
     Config config;
     config.sVersionString = VERSION_STRING;
-    config.sHome = (std::string)getenv("HOME");
-    config.sCookiePath = config.sHome + "/.gogdownloader/cookies.txt";
-    config.sConfigFilePath = config.sHome + "/.gogdownloader/config.cfg";
-    config.sXMLDirectory = config.sHome + "/.gogdownloader/xml";
+    char *xdgconfig = getenv("XDG_CONFIG_HOME");
+    char *xdgcache = getenv("XDG_CACHE_HOME");
+    std::string home = (std::string)getenv("HOME");
 
-    // Create gogdownloader directories
+    if (xdgconfig)
+    {
+        config.sConfigDirectory = (std::string)xdgconfig + "/lgogdownloader";
+        config.sCookiePath = config.sConfigDirectory + "/cookies.txt";
+        config.sConfigFilePath = config.sConfigDirectory + "/config.cfg";
+    }
+    else
+    {
+        config.sConfigDirectory = home + "/.config/lgogdownloader";
+        config.sCookiePath = config.sConfigDirectory + "/cookies.txt";
+        config.sConfigFilePath = config.sConfigDirectory + "/config.cfg";
+    }
+
+    if (xdgcache)
+        config.sXMLDirectory = (std::string)xdgcache + "/lgogdownloader/xml";
+    else
+        config.sXMLDirectory = home + "/.cache/lgogdownloader/xml";
+
+    // Create lgogdownloader directories
     boost::filesystem::path path = config.sXMLDirectory;
     if (!boost::filesystem::exists(path))
     {
@@ -49,6 +66,16 @@ int main(int argc, char *argv[])
         }
     }
 
+    path = config.sConfigDirectory;
+    if (!boost::filesystem::exists(path))
+    {
+        if (!boost::filesystem::create_directories(path))
+        {
+            std::cout << "Failed to create directory: " << path << std::endl;
+            return 1;
+        }
+    }
+
     // Create help text for --platform option
     std::string platform_text = "Select which installers are downloaded\n";
     unsigned int platform_sum = 0;