scripting: fix mkdirs and canonical path on image::save

Author: ihm-tswow

src/noggit/scripting/script_filesystem.cpp

@@ -18,16 +18,13 @@ namespace noggit
 {
   namespace scripting
   {
-    namespace
+    void mkdirs(std::string const& pathstr)
     {
-      void mkdirs(std::string const& pathstr)
+      auto path = fs::path(pathstr);
+      auto parent_path = path.parent_path();
+      if (parent_path.string().size() > 0)
       {
-        auto path = fs::path(pathstr);
-        auto parent_path = path.parent_path();
-        if (parent_path.string().size() > 0)
-        {
-          fs::create_directories(path.parent_path());
-        }
+        fs::create_directories(path.parent_path());
       }
     }
 

src/noggit/scripting/script_filesystem.hpp

@@ -18,5 +18,6 @@ namespace noggit
     std::string read_file(std::string const& path);
     bool path_exists(std::string const& path);
     void register_filesystem(script_context * state);
+    void mkdirs(std::string const& path);
   } // namespace scripting
 } // namespace noggit

src/noggit/scripting/script_image.cpp

@@ -129,7 +129,8 @@ namespace noggit
     void image::save(std::string const& filename)
     {
       auto writable_path = get_writable_path("image::save", state(), filename);
-      unsigned error = lodepng::encode(filename, get_image(), _width, _height);
+      mkdirs(writable_path.string());
+      unsigned error = lodepng::encode(writable_path.string(), get_image(), _width, _height);
       if (error)
       {
         throw script_exception(