feat: Add raw completer for cmd_read_only command

aider/commands.py

@@ -8,6 +8,7 @@ from pathlib import Path
 
 import pyperclip
 from PIL import Image, ImageGrab
+from prompt_toolkit.completion import PathCompleter
 
 from aider import models, prompts, voice
 from aider.format_settings import format_settings
@@ -574,8 +575,32 @@ class Commands:
             fname = f'"{fname}"'
         return fname
 
-    def completions_read_only(self):
-        return self.completions_add()
+    def completions_raw_read_only(self, document, complete_event):
+        # Extract the part of the input after the command
+        text = document.text[len("/read-only"):].lstrip()
+        
+        # Create a PathCompleter
+        path_completer = PathCompleter(
+            only_directories=False,
+            expanduser=True,
+            get_paths=lambda: [self.coder.root],
+        )
+        
+        # Get completions from the PathCompleter
+        completions = path_completer.get_completions(
+            document.replace(text=text),
+            complete_event
+        )
+        
+        # Yield the completions
+        for completion in completions:
+            # Adjust the start position to account for the command
+            yield Completion(
+                completion.text,
+                start_position=completion.start_position - len(document.text) + len(text),
+                display=completion.display,
+                display_meta=completion.display_meta
+            )
 
     def completions_add(self):
         files = set(self.coder.get_all_relative_files())