[PATCH 1 of 3] getch() -- to read one keystroke from console

[Kirill Smelkov]

# HG changeset patch
# User Kirill Smelkov <kirr at mns.spb.ru>
# Date 1198597912 -10800
# Node ID b74f1d14d56ea89736a1505e6a0dc1e9f246b81a
# Parent  6ce2bf084c586678decb828ef1fc9b925d35af5d
getch() -- to read one keystroke from console

taken from http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/134892

diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -1766,3 +1766,46 @@ def hidepassword(url):
             url_parts[1])
     return urlparse.urlunparse(url_parts)
 
+
+
+# getch, taken from http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/134892
+class _Getch:
+    """Gets a single character from standard input.  Does not echo to the
+screen."""
+    def __init__(self):
+        try:
+            self.impl = _GetchWindows()
+        except ImportError:
+            self.impl = _GetchUnix()
+
+    def __call__(self): return self.impl()
+
+
+class _GetchUnix:
+    def __init__(self):
+        import tty, sys
+
+    def __call__(self):
+        import sys, tty, termios
+        fd = sys.stdin.fileno()
+        old_settings = termios.tcgetattr(fd)
+        try:
+            tty.setraw(sys.stdin.fileno())
+            ch = sys.stdin.read(1)
+        finally:
+            termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
+        return ch
+
+
+class _GetchWindows:
+    def __init__(self):
+        import msvcrt
+
+    def __call__(self):
+        import msvcrt
+        return msvcrt.getch()
+
+
+getch = _Getch()
+
+