Merge branch '51-tell-user-if-saving-goes-wrong' into 'main'

Tell user if unable/able to save

Closes #51

See merge request !25

src/simudator/core/module.py

 from __future__ import annotations
+from os import error
 
 from simudator.core.signal import Signal
 

src/simudator/core/processor.py

@@ -497,7 +497,7 @@ class Processor:
             module = self.get_module(module_name)
             module.load_from_str(module_str)
 
-    def save_state_to_file(self, file_path: str) -> None:
+    def save_state_to_file(self, file_path: str) -> bool:
         """Save the current state of the cpu to file.
 
         Will overwrite the given file.
@@ -512,7 +512,12 @@ class Processor:
         file.close()
 
         for module in self.modules.values():
-            module.save_state_to_file(file_path)
+            res =module.save_state_to_file(file_path)
+
+            if not res:
+                return False
+        
+        return True
 
     def pretty_print(self) -> None:
         """Print the processor state in a readable and compact format."""

src/simudator/gui/gui.py

@@ -848,7 +848,12 @@ class GUI(QMainWindow):
         if path == '':
             return
 
-        self.cpu.save_state_to_file(path)
+        res = self.cpu.save_state_to_file(path)
+
+        if res:
+            self.messageBox("File saved.")
+        else:
+            self.errorBox("Unable to save.")
 
     def openBreakpointWindow(self) -> None:
         """