feat: add compact file listing using rich Columns when pretty=True

aider/io.py

@@ -700,17 +700,37 @@ class InputOutput:
                 self.chat_history_file = None  # Disable further attempts to write
 
     def format_files_for_input(self, rel_fnames, rel_read_only_fnames):
-        read_only_files = []
-        for full_path in sorted(rel_read_only_fnames or []):
-            read_only_files.append(f"{full_path} (read only)")
+        if not self.pretty:
+            read_only_files = []
+            for full_path in sorted(rel_read_only_fnames or []):
+                read_only_files.append(f"{full_path} (read only)")
 
-        editable_files = []
-        for full_path in sorted(rel_fnames):
-            if full_path in rel_read_only_fnames:
-                continue
-            editable_files.append(f"{full_path}")
+            editable_files = []
+            for full_path in sorted(rel_fnames):
+                if full_path in rel_read_only_fnames:
+                    continue
+                editable_files.append(f"{full_path}")
 
-        return "\n".join(read_only_files + editable_files) + "\n"
+            return "\n".join(read_only_files + editable_files) + "\n"
+
+        # Use rich Columns for pretty output
+        from rich.columns import Columns
+        from io import StringIO
+
+        output = StringIO()
+        console = Console(file=output, force_terminal=False)
+
+        read_only_files = [f"{f} (read only)" for f in sorted(rel_read_only_fnames or [])]
+        editable_files = [f for f in sorted(rel_fnames) if f not in rel_read_only_fnames]
+
+        if read_only_files:
+            console.print(Columns(read_only_files))
+        if editable_files:
+            if read_only_files:
+                console.print()
+            console.print(Columns(editable_files))
+
+        return output.getvalue()
 
 
 def get_rel_fname(fname, root):