aiorepl: Switch terminal mode around code execution.

Use micropython.stdio_mode_raw() when available to set the terminal to
raw mode for character-at-a-time input and restore cooked mode during
code execution. This matches how the native REPL toggles terminal mode
and fixes aiorepl on the unix port where the terminal defaults to cooked
mode after the native REPL yields control.

On embedded ports where stdio_mode_raw is not available, the getattr
fallback to a no-op lambda keeps the existing behaviour unchanged.

Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>

Author: pi-anl

micropython/aiorepl/aiorepl.py

@@ -97,6 +97,7 @@ async def task(g=None, prompt="--> "):
     print("Starting asyncio REPL...")
     if g is None:
         g = __import__("__main__").__dict__
+    _stdio_raw = getattr(micropython, "stdio_mode_raw", lambda _: None)
     try:
         micropython.kbd_intr(-1)
         s = asyncio.StreamReader(sys.stdin)
@@ -107,6 +108,7 @@ async def task(g=None, prompt="--> "):
         c = 0  # ord of most recent character.
         t = 0  # timestamp of most recent character.
         _autocomplete = getattr(micropython, "repl_autocomplete", None)
+        _stdio_raw(True)
         while True:
             hist_b = 0  # How far back in the history are we currently.
             sys.stdout.write(prompt)
@@ -145,10 +147,12 @@ async def task(g=None, prompt="--> "):
                             hist_n = min(_HISTORY_LIMIT - 1, hist_n + 1)
                             hist_i = (hist_i + 1) % _HISTORY_LIMIT
 
+                            _stdio_raw(False)
                             result = await execute(cmd, g, s)
                             if result is not None:
                                 sys.stdout.write(repr(result))
                                 sys.stdout.write("\n")
+                            _stdio_raw(True)
                         break
                     elif c == 0x08 or c == 0x7F:
                         # Backspace.
@@ -164,7 +168,9 @@ async def task(g=None, prompt="--> "):
                                 cmd = cmd[:-1]
                                 sys.stdout.write("\x08 \x08")
                     elif c == CHAR_CTRL_A:
+                        _stdio_raw(False)
                         raw_repl(sys.stdin, g)
+                        _stdio_raw(True)
                         break
                     elif c == CHAR_CTRL_B:
                         continue
@@ -175,10 +181,12 @@ async def task(g=None, prompt="--> "):
                         break
                     elif c == CHAR_CTRL_D:
                         if paste:
+                            _stdio_raw(False)
                             result = await execute(cmd, g, s)
                             if result is not None:
                                 sys.stdout.write(repr(result))
                                 sys.stdout.write("\n")
+                            _stdio_raw(True)
                             break
 
                         sys.stdout.write("\n")
@@ -264,6 +272,7 @@ async def task(g=None, prompt="--> "):
                         sys.stdout.write(b)
                         cmd += b
     finally:
+        _stdio_raw(False)
         micropython.kbd_intr(3)