warn user when closing tabs with unsaved changes

src/widgets/file_tabs.py

@@ -9,6 +9,7 @@ from textual_fspicker import FileOpen, FileSave, SelectDirectory
 from widgets.text_editor import TextEditor
 from widgets.home_page import HomePage
 from widgets.context_menu import ContextMenu
+from widgets.prompt import Prompt
 
 import os, pathlib
 
@@ -99,9 +100,26 @@ class FileTabs(TabbedContent):
                         return False
         return True
     
+    async def close_tab(self, tab: FileTab):
+        if tab.saved:
+            self.remove_pane(tab.id)
+            return
+        
+        def callback(should_close: bool):
+            if should_close:
+                self.remove_pane(tab.id)
+        
+        await self.app.push_screen(Prompt(
+            f"{tab.file_name} has unsaved changes, are you sure you want to close it?",
+            prompt_type="confirm"
+        ), callback=callback)
+    
     async def close_open_tab(self):
         if self.active_pane:
-            self.remove_pane(self.active)
+            if not isinstance(self.active_pane, FileTab):
+                self.remove_pane(self.active)
+            else:
+                await self.close_tab(self.active_pane)
     
     async def new_file(self):
         new_tab = FileTab(None)

src/widgets/prompt.py

@@ -61,7 +61,7 @@ class Prompt(ModalScreen):
         elif event.button.id == "confirm-list":
             self.dismiss(self.query_one("#select").value)
 
-    def __init__(self, question: str, prompt_type: Literal["confirm", "string"], title: str = "Confirm", **kwargs):
+    def __init__(self, question: str, prompt_type: Literal["confirm", "string", "list"], title: str = "Confirm", **kwargs):
         super().__init__()
         self.question = question
         self.window_title = title