from django import template                                                                                                  
register = template.Library()                                                                                                
                                                                                                                             
                                                                                                                             
from pygments import highlight                                                                                               
from pygments.formatters import HtmlFormatter                                                                                
from pygments.lexers import get_lexer_by_name, guess_lexer                                                                   
                                                                                                                             
@register.filter                                                                                                             
def render(content):                                                                                                         
    """Render this content for display."""                                                                                   
    formatter = HtmlFormatter(cssclass=u'source')                                                                            
                                                                                                                             
    try:                                                                                                                     
        # Guess a lexer by the contents of the block.                                                                        
        lexer = guess_lexer(content)                                                                                         
    except ValueError, e:                                                                                                    
        # Just make it plain text.                                                                                           
        lexer = get_lexer_by_name(u'text', stripnl=True, encoding=u'UTF-8')                                                  
    result = highlight(content, lexer, formatter)                                                                            
    return unicode(result)