handle piped input for canned asciinema demos

aider/coder.py

@@ -164,6 +164,8 @@ class Coder:
                 if self.num_control_c >= 2:
                     break
                 self.console.print("[bold red]^C again to quit")
+            except EOFError:
+                return
 
     def run_loop(self):
         if self.pretty:
@@ -336,6 +338,8 @@ class Coder:
         for match in self.pattern.finditer(content):
             _, path, _, _, original, updated = match.groups()
 
+            path = path.strip()
+
             if path not in self.fnames:
                 if not Path(path).exists():
                     question = f"[red bold]Allow creation of new file {path}?"