Fixed stdout

sia/web_io_buffer.py

@@ -1,4 +1,5 @@
 from threading import Lock
+from typing import Callable, List
 
 from .io_buffer import IOBuffer
 
@@ -10,6 +11,14 @@ class WebIOBuffer(IOBuffer):
     def __init__(self):
         self._stdin_buffer = ""
         self._stdout_buffer = ""
+        self._stdout_change_handlers: List[Callable[[str], None]] = []
+    
+    def add_stdout_change_handler(self, handler: Callable[[str], None]) -> None:
+        """
+        Add a callback for stdout changes.
+        """
+        if handler not in self._stdout_change_handlers:
+            self._stdout_change_handlers.append(handler)
     
     def read(self) -> str:
         """Thread-safe read from stdin buffer."""
@@ -20,6 +29,8 @@ class WebIOBuffer(IOBuffer):
     def write(self, content: str) -> None:
         """Thread-safe write to stdout buffer."""
         self._stdout_buffer += content
+        for handler in self._stdout_change_handlers:
+            handler(self._stdout_buffer)
             
     def buffer_length(self) -> int:
         """
@@ -45,4 +56,6 @@ class WebIOBuffer(IOBuffer):
             
     def clear_stdout(self) -> None:
         """Thread-safe clear stdout buffer."""
-        self._stdout_buffer = ""
+        self._stdout_buffer = ""
+        for handler in self._stdout_change_handlers:
+            handler(self._stdout_buffer)