lib/file: Fix isOpen not being set properly when closing and reopening; add destructor

src/lib/file.cpp

@@ -28,9 +28,13 @@ File::File(std::string path, char mode, uint64_t cursorPosition): mode(mode), pa
     std::filesystem::path filePath = path;
     this->size = ErrorOr<uint64_t>(std::filesystem::file_size(filePath));
     this->open();
-    this->isOpen = true;
 }
 
+File::~File() {
+    if (this->isOpen) {
+        this->fileStream.close();
+    }
+}
 
 void File::open(){
     switch(this->mode){
@@ -49,6 +53,7 @@ void File::open(){
             break;
     }
 
+    this->isOpen = this->fileStream.is_open();
 }
 
 void File::close(){

src/lib/file.hpp

@@ -45,6 +45,8 @@ class File {
         ErrorOr<uint64_t> size;
 
         File() {};
+        ~File();
+
         void open();
         void close();