inputhook: make stdin_ready() function reusable

Move it from lib.inputhookwx to lib.inputhook, as the former
module can only be loaded if wx itself is available.

IPython/lib/inputhook.py

@@ -15,8 +15,13 b' Inputhook management for GUI event loop integration.'
 #-----------------------------------------------------------------------------
 
 import ctypes
+import os
 import sys
 import warnings
+if os.name == 'posix':
+    import select
+elif sys.platform == 'win32':
+    import msvcrt
 
 #-----------------------------------------------------------------------------
 # Constants
@@ -33,9 +38,19 b" GUI_GLUT = 'glut'"
 GUI_PYGLET = 'pyglet'
 
 #-----------------------------------------------------------------------------
-# Utility classes
+# Utilities
 #-----------------------------------------------------------------------------
 
+def stdin_ready():
+    if os.name == 'posix':
+        infds, outfds, erfds = select.select([sys.stdin],[],[],0)
+        if infds:
+            return True
+        else:
+            return False
+    elif sys.platform == 'win32':
+        return msvcrt.kbhit()
+
 
 #-----------------------------------------------------------------------------
 # Main InputHookManager class

IPython/lib/inputhookwx.py

@@ -24,26 +24,13 b' import time'
 from timeit import default_timer as clock
 import wx
 
-if os.name == 'posix':
-    import select
-elif sys.platform == 'win32':
-    import msvcrt
+from IPython.lib.inputhook import stdin_ready
+
 
 #-----------------------------------------------------------------------------
 # Code
 #-----------------------------------------------------------------------------
 
-def stdin_ready():
-    if os.name == 'posix':
-        infds, outfds, erfds = select.select([sys.stdin],[],[],0)
-        if infds:
-            return True
-        else:
-            return False
-    elif sys.platform == 'win32':
-        return msvcrt.kbhit()
-
-
 def inputhook_wx1():
     """Run the wx event loop by processing pending events only.