Changed code to support older Python versions

venv/lib/python3.11/site-packages/rich_toolkit/_getchar.py

@@ -0,0 +1,157 @@
+"""
+Unified getchar implementation for all platforms.
+
+Combines approaches from:
+- Textual (Unix/Linux): Copyright (c) 2023 Textualize Inc., MIT License
+- Click (Windows fallback): Copyright 2014 Pallets, BSD-3-Clause License
+"""
+
+import os
+import sys
+from codecs import getincrementaldecoder
+from typing import Optional, TextIO
+
+
+def getchar() -> str:
+    """
+    Read input from stdin with support for longer pasted text.
+
+    On Windows:
+    - Uses msvcrt for native Windows console input
+    - Handles special keys that send two-byte sequences
+    - Reads up to 4096 characters for paste support
+
+    On Unix/Linux:
+    - Uses Textual's approach with manual termios configuration
+    - Reads up to 4096 bytes with proper UTF-8 decoding
+    - Provides fine-grained terminal control
+
+    Returns:
+        str: The input character(s) read from stdin
+
+    Raises:
+        KeyboardInterrupt: When CTRL+C is pressed
+    """
+    if sys.platform == "win32":
+        # Windows implementation
+        try:
+            import msvcrt
+        except ImportError:
+            # Fallback if msvcrt is not available
+            return sys.stdin.read(1)
+
+        # Use getwch for Unicode support
+        func = msvcrt.getwch  # type: ignore
+
+        # Read first character
+        rv = func()
+
+        # Check for special keys (they send two characters)
+        if rv in ("\x00", "\xe0"):
+            # Special key, read the second character
+            rv += func()
+            return rv
+
+        # Check if more input is available (for paste support)
+        chars = [rv]
+        max_chars = 4096
+
+        # Keep reading while characters are available
+        while len(chars) < max_chars and msvcrt.kbhit():  # type: ignore
+            next_char = func()
+
+            # Handle special keys during paste
+            if next_char in ("\x00", "\xe0"):
+                # Stop here, let this be handled in next call
+                break
+
+            chars.append(next_char)
+
+            # Check for CTRL+C
+            if next_char == "\x03":
+                raise KeyboardInterrupt()
+
+        result = "".join(chars)
+
+        # Check for CTRL+C in the full result
+        if "\x03" in result:
+            raise KeyboardInterrupt()
+
+        return result
+
+    else:
+        # Unix/Linux implementation (Textual approach)
+        import termios
+        import tty
+
+        f: Optional[TextIO] = None
+        fd: int
+
+        # Get the file descriptor
+        if not sys.stdin.isatty():
+            f = open("/dev/tty")
+            fd = f.fileno()
+        else:
+            fd = sys.stdin.fileno()
+
+        try:
+            # Save current terminal settings
+            attrs_before = termios.tcgetattr(fd)
+
+            try:
+                # Configure terminal settings (Textual-style)
+                newattr = termios.tcgetattr(fd)
+
+                # Patch LFLAG (local flags)
+                # Disable:
+                # - ECHO: Don't echo input characters
+                # - ICANON: Disable canonical mode (line-by-line input)
+                # - IEXTEN: Disable extended processing
+                # - ISIG: Disable signal generation
+                newattr[tty.LFLAG] &= ~(
+                    termios.ECHO | termios.ICANON | termios.IEXTEN | termios.ISIG
+                )
+
+                # Patch IFLAG (input flags)
+                # Disable:
+                # - IXON/IXOFF: XON/XOFF flow control
+                # - ICRNL/INLCR/IGNCR: Various newline translations
+                newattr[tty.IFLAG] &= ~(
+                    termios.IXON
+                    | termios.IXOFF
+                    | termios.ICRNL
+                    | termios.INLCR
+                    | termios.IGNCR
+                )
+
+                # Set VMIN to 1 (minimum number of characters to read)
+                # This ensures we get at least 1 character
+                newattr[tty.CC][termios.VMIN] = 1
+
+                # Apply the new terminal settings
+                termios.tcsetattr(fd, termios.TCSANOW, newattr)
+
+                # Read up to 4096 bytes (same as Textual)
+                raw_data = os.read(fd, 1024 * 4)
+
+                # Use incremental UTF-8 decoder for proper Unicode handling
+                decoder = getincrementaldecoder("utf-8")()
+                result = decoder.decode(raw_data, final=True)
+
+                # Check for CTRL+C (ASCII 3)
+                if "\x03" in result:
+                    raise KeyboardInterrupt()
+
+                return result
+
+            finally:
+                # Restore original terminal settings
+                termios.tcsetattr(fd, termios.TCSANOW, attrs_before)
+                sys.stdout.flush()
+
+                if f is not None:
+                    f.close()
+
+        except termios.error:
+            # If we can't control the terminal, fall back to simple read
+            return sys.stdin.read(1)