Add new winconsole module and fixes to page_dumb() to improve its behavior

under win32.  Contributed by Alexander Belchenko <bialix-AT-ukr.net>.

IPython/winconsole.py

@@ -0,0 +1,43 b''
+"""
+Set of functions to work with console on Windows.
+
+Author: Alexander Belchenko (e-mail: bialix AT ukr.net)
+License: Public domain
+"""
+
+__author__  = 'Alexander Belchenko (e-mail: bialix AT ukr.net)'
+__license__ = 'Public domain'
+
+import struct
+
+try:
+    import ctypes
+except ImportError:
+    ctypes = None
+
+def get_console_size(defaultx=80, defaulty=25):
+    """ Return size of current console.
+
+    This function try to determine actual size of current working
+    console window and return tuple (sizex, sizey) if success,
+    or default size (defaultx, defaulty) otherwise.
+
+    Dependencies: ctypes should be installed.
+    """
+    if ctypes is None:
+        # no ctypes is found
+        return (defaultx, defaulty)
+
+    h = ctypes.windll.kernel32.GetStdHandle(-11)
+    csbi = ctypes.create_string_buffer(22)
+    res = ctypes.windll.kernel32.GetConsoleScreenBufferInfo(h, csbi)
+    
+    if res:
+        (bufx, bufy, curx, cury, wattr,
+         left, top, right, bottom, maxx, maxy) = struct.unpack("hhhhHhhhhhh",
+                                                               csbi.raw)
+        sizex = right - left + 1
+        sizey = bottom - top + 1
+        return (sizex, sizey)
+    else:
+        return (defaultx, defaulty)

IPython/genutils.py

@@ -5,7 +5,7 b' General purpose utilities.'
 This is a grab-bag of stuff I find useful in most programs I write. Some of
 these things are also convenient when working at the command line.
 
-$Id: genutils.py 967 2005-12-29 09:02:13Z fperez $"""
+$Id: genutils.py 971 2005-12-29 18:30:45Z fperez $"""
 
 #*****************************************************************************
 #       Copyright (C) 2001-2004 Fernando Perez. <[e-mail]>
@@ -37,6 +37,9 b' import types'
 from IPython.Itpl import Itpl,itpl,printpl
 from IPython import DPyGetOpt
 
+if os.name == "nt":
+    from IPython.winconsole import get_console_size
+
 # Build objects which appeared in Python 2.3 for 2.2, to make ipython
 # 2.2-friendly
 try:
@@ -1179,6 +1182,31 b' def get_pager_start(pager,start):'
     return start_string
 
 #----------------------------------------------------------------------------
+if os.name == "nt":
+    import msvcrt
+    def page_more():
+        """ Smart pausing between pages
+
+        @return:    True if need print more lines, False if quit
+        """
+        Term.cout.write('---Return to continue, q to quit--- ')
+        ans = msvcrt.getch()
+        if ans in ("q", "Q"):
+            result = False
+        else:
+            result = True
+        Term.cout.write("\b"*37 + " "*37 + "\b"*37)
+        return result
+else:
+    def page_more():
+        ans = raw_input('---Return to continue, q to quit--- ')
+        if ans.lower().startswith('q'):
+            return False
+        else:
+            return True
+
+esc_re = re.compile(r"(\x1b[^m]+m)")
+
 def page_dumb(strng,start=0,screen_lines=25):
     """Very dumb 'pager' in Python, for when nothing else works.
 
@@ -1190,12 +1218,16 b' def page_dumb(strng,start=0,screen_lines=25):'
     if len(screens) == 1:
         print >>Term.cout, os.linesep.join(screens[0])
     else:
+        last_escape = ""
         for scr in screens[0:-1]:
-            print >>Term.cout, os.linesep.join(scr)
-            ans = raw_input('---Return to continue, q to quit--- ')
-            if ans.lower().startswith('q'):
+            hunk = os.linesep.join(scr)
+            print >>Term.cout, last_escape + hunk
+            if not page_more():
                 return
-        print >>Term.cout, os.linesep.join(screens[-1])
+            esc_list = esc_re.findall(hunk)
+            if len(esc_list) > 0:
+                last_escape = esc_list[-1]
+        print >>Term.cout, last_escape + os.linesep.join(screens[-1])
 
 #----------------------------------------------------------------------------
 def page(strng,start=0,screen_lines=0,pager_cmd = None):
@@ -1235,6 +1267,9 b' def page(strng,start=0,screen_lines=0,pager_cmd = None):'
     # terminals. If someone later feels like refining it, it's not hard.
     numlines = max(num_newlines,int(len_str/80)+1)
 
+    if os.name == "nt":
+        screen_lines_def = get_console_size(defaulty=25)[1]
+    else:
     screen_lines_def = 25 # default value if we can't auto-determine
 
     # auto-determine screen size

doc/ChangeLog

@@ -1,5 +1,9 b''
 2005-12-29  Fernando Perez  <[e-mail]>
 
+	* IPython/winconsole.py (get_console_size): add new winconsole
+	module and fixes to page_dumb() to improve its behavior under
+	win32.  Contributed by Alexander Belchenko <bialix-AT-ukr.net>.
+
 	* IPython/Magic.py (Macro): simplified Macro class to just
 	subclass list.  We've had only 2.2 compatibility for a very long
 	time, yet I was still avoiding subclassing the builtin types.  No
@@ -7,7 +11,7 b''
 	2.3-specific features quite yet).
 	(magic_store): added Ville's patch for lightweight variable
 	persistence, after a request on the user list by Matt Wilkie
-	<maphew at gmail.com>.  The new %store magic's docstring has full
+	<maphew-AT-gmail.com>.  The new %store magic's docstring has full
 	details.
 
 	* IPython/iplib.py (InteractiveShell.post_config_initialization):

doc/manual_base.lyx

@@ -9149,4 +9149,13 b' Tsai'
 \end_inset 
 
 ).
+\layout List
+\labelwidthstring 00.00.0000
+
+Alexander\SpecialChar ~
+Belchenko 
+\family typewriter 
+<bialix-AT-ukr.net>
+\family default 
+ Improvements for win32 paging system.
 \the_end