lib/file: change File::eof to a function

This is just way easier to implement and less messy.

src/lib/file.cpp

@@ -29,7 +29,6 @@ File::File(std::string path, char mode, uint64_t cursorPosition): mode(mode), pa
     this->size = ErrorOr<uint64_t>(std::filesystem::file_size(filePath));
     this->open();
     this->isOpen = true;
-    this->eof = false;
 }
 
 
@@ -57,6 +56,10 @@ void File::close(){
     this->isOpen = false;
 }
 
+bool File::eof() {
+    return !this->size.isError && this->cursorPosition >= this->size.value;
+}
+
 ErrorOr<uint8_t> File::readByte(){
     uint8_t* nextPointer = new uint8_t;
     uint8_t nextByte;

src/lib/file.hpp

@@ -39,7 +39,6 @@ class File {
         File(std::string path, char mode, uint64_t cursorPosition);
     public:
         bool isOpen;
-        bool eof;
         std::string path;
         uint64_t cursorPosition;
         // may be error if not a regular file or size cannot be determined
@@ -49,6 +48,8 @@ class File {
         void open();
         void close();
 
+        bool eof();
+
         // only applicable to read and edit modes
         // moves the cursor to the right of the read section
         ErrorOr<uint8_t> readByte();