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Thursday, March 19, 2009

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IronPython ConsoleColorMgr

I really liked the ConsoleColorMgr class from my last ipydbg post so I took a few minutes to yank it out into its own seperate module. I also took the opportunity to make a few improvements.

First off, I added support for background colors as well as foreground colors. Furthermore, both colors default to “None” which ConsoleColorMgr takes to mean leave that color unchanged.

from System import Console as _Console     
    
class ConsoleColorMgr(object):     
  def __init__(self, foreground = None, background = None):     
    self.foreground = foreground     
    self.background = background     
    
  def __enter__(self):   
    self._tempFG = _Console.ForegroundColor   
    self._tempBG = _Console.BackgroundColor  
    if self.foreground: _Console.ForegroundColor = self.foreground   
    if self.background: _Console.BackgroundColor = self.background     
       
  def __exit__(self, t, v, tr):   
    _Console.ForegroundColor = self._tempFG  
    _Console.BackgroundColor = self._tempBG 

The other change I made was to build a set of default ConsoleColorMgr instances in the consolecolor module, one for each of the values in ConsoleColor.

import sys   
from System import ConsoleColor, Enum     
   
_curmodule = sys.modules[__name__]     
     
for n in Enum.GetNames(ConsoleColor):     
    setattr(_curmodule, n, ConsoleColorMgr(Enum.Parse(ConsoleColor, n)))

Note that for this set of default ConsoleColorMgr instances, I’m only setting the foreground color. If you want to set the background color, you have to create your own ConsoleColorMgr instances. This allows me to write the following:

from __future__ import with_statement     
import consolecolor    
    
with consolecolor.Red:     
    print "Open the pod bay doors, HAL"    
with consolecolor.ConsoleColorMgr(ConsoleColor.Black, ConsoleColor.Red):  
    print "I'm sorry Dave, I'm afraid I can't do that." 

If you want it, I’ve put consolecolor.py up on my skydrive or it’s available as part of my devhawk_ipy project on GitHub.

Update - Christopher Bermingham pointed out that my sample snippet at the end doesn’t work unless you add “from __future__ import with_statement” to the top of your python file. I updated my code snippet to include this. Thanks Christopher!

Posted By Harry Pierson at 3:43 PM Pacific Standard Time

Comments [3]

IronPython

Friday, March 20, 2009 8:07:08 AM (Pacific Standard Time, UTC-08:00)

Hello- I am trying to get your consolecolor sample running... What version of IronPython is that? I am running the latest release 2.0.0.0 (which is really 2.0.1 file version 2.0.20209.00). I believe the CPython 2.5 'with' statement doesn't seem to be recognized.

>>> with consolecolor.Red:
File "<stdin>", line 1
with consolecolor.Red

^
SyntaxError: unexpected token 'consolecolor'

Christopher Bermingham

Friday, March 20, 2009 11:26:33 AM (Pacific Standard Time, UTC-08:00)

Me again-
I found it in an article that it looks like you have bookmarked :)
from __future__ import with_statement

http://langexplr.blogspot.com/2009/02/writing-xml-with-ironpython-xmlwriter.html

Your sample looks great. Thanks!

Christopher Bermingham

Friday, March 20, 2009 12:45:26 PM (Pacific Standard Time, UTC-08:00)

Woops, thanks for pointing out my mistake Christoper. I've updated the code to include the __future__ import.

As for that xmlwriter article, that was the inspiration for this approach!

DevHawk

Comments are closed.

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