templatish tags for text plugins to avoid fragile internal urls

cms_plugin_processors.py

import re

from cms.models.pagemodel import Page
from django.contrib.sites.models import Site
from django.utils.safestring import mark_safe


TAG  = re.compile(r'''
  \{%                # opening
  
  \s*                # optional whitespace
  
  (
    [a-z_-]+         # command
    (?:\s+[^\s%}]+)* # optional arguments
  )
  
  \s*                # optional whitespace
  
  %\}                # closing
''', re.VERBOSE)

def cms_plugin_templateish_tags(instance, placeholder, rendered_content, original_context):
    site = Site.objects.get_current().id
    rules = {
        'static': lambda x: original_context['STATIC_URL'],
        'page': lambda x: Page.objects.public().get(reverse_id=x[0], site=site).get_absolute_url(),
    }
    def replace(m):
        args = m.groups()[0].split(' ')
        cmd = args.pop(0)
        try:
            return rules[cmd](args)
        except:
            return ''
    
    if instance.plugin_type == 'TextPlugin':
        try:
            return mark_safe(TAG.sub(replace, rendered_content))
        except:
            return rendered_content

    return rendered_content