gh-131507: Add support for syntax highlighting in PyREPL (GH-133247)

Co-authored-by: Victorien <65306057+Viicos@users.noreply.github.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

Lib/_pyrepl/windows_console.py

@@ -426,6 +426,20 @@ class WindowsConsole(Console):
 
         return rec
 
+    def _read_input_bulk(
+        self, block: bool, n: int
+    ) -> tuple[ctypes.Array[INPUT_RECORD], int]:
+        rec = (n * INPUT_RECORD)()
+        read = DWORD()
+
+        if not block and not self.wait(timeout=0):
+            return rec, 0
+
+        if not ReadConsoleInput(InHandle, rec, n, read):
+            raise WinError(GetLastError())
+
+        return rec, read.value
+
     def get_event(self, block: bool = True) -> Event | None:
         """Return an Event instance.  Returns None if |block| is false
         and there is no event pending, otherwise waits for the
@@ -521,7 +535,23 @@ class WindowsConsole(Console):
     def getpending(self) -> Event:
         """Return the characters that have been typed but not yet
         processed."""
-        return Event("key", "", b"")
+        e = Event("key", "", b"")
+
+        while not self.event_queue.empty():
+            e2 = self.event_queue.get()
+            if e2:
+                e.data += e2.data
+
+        recs, rec_count = self._read_input_bulk(False, 1024)
+        for i in range(rec_count):
+            rec = recs[i]
+            if rec and rec.EventType == KEY_EVENT:
+                key_event = rec.Event.KeyEvent
+                ch = key_event.uChar.UnicodeChar
+                if ch == "\r":
+                    ch += "\n"
+                e.data += ch
+        return e
 
     def wait(self, timeout: float | None) -> bool:
         """Wait for an event."""