apps/compress/templatetags/compressed.py

   1 import os
   2
   3 from django import template
   4
   5 from django.conf import settings as django_settings
   6
   7 from compress.conf import settings
   8 from compress.utils import media_root, media_url, needs_update, filter_css, filter_js, get_output_filename, get_version
   9
  10 register = template.Library()
  11
  12 def render_common(template_name, obj, filename, version):
  13     if settings.COMPRESS:
  14         filename = get_output_filename(filename, version)
  15
  16     context = obj.get('extra_context', {})
  17     context['url'] = media_url(filename)
  18
  19     return template.loader.render_to_string(template_name, context)
  20
  21 def render_css(css, filename, version=None):
  22     return render_common(css.get('template_name', 'compress/css.html'), css, filename, version)
  23
  24 def render_js(js, filename, version=None):
  25     return render_common(js.get('template_name', 'compress/js.html'), js, filename, version)
  26
  27 class CompressedCSSNode(template.Node):
  28     def __init__(self, name):
  29         self.name = name
  30
  31     def render(self, context):
  32         css_name = template.Variable(self.name).resolve(context)
  33
  34         try:
  35             css = settings.COMPRESS_CSS[css_name]
  36         except KeyError:
  37             return '' # fail silently, do not return anything if an invalid group is specified
  38
  39         if settings.COMPRESS:
  40
  41             version = None
  42
  43             if settings.COMPRESS_AUTO:
  44                 u, version = needs_update(css['output_filename'], css['source_filenames'])
  45                 if u:
  46                     filter_css(css)
  47
  48             return render_css(css, css['output_filename'], version)
  49         else:
  50             # output source files
  51             r = ''
  52             for source_file in css['source_filenames']:
  53                 r += render_css(css, source_file)
  54
  55             return r
  56
  57 class CompressedJSNode(template.Node):
  58     def __init__(self, name):
  59         self.name = name
  60
  61     def render(self, context):
  62         js_name = template.Variable(self.name).resolve(context)
  63
  64         try:
  65             js = settings.COMPRESS_JS[js_name]
  66         except KeyError:
  67             return '' # fail silently, do not return anything if an invalid group is specified
  68
  69         if settings.COMPRESS:
  70
  71             version = None
  72
  73             if settings.COMPRESS_AUTO:
  74                 u, version = needs_update(js['output_filename'], js['source_filenames'])
  75                 if u:
  76                     filter_js(js)
  77
  78             return render_js(js, js['output_filename'], version)
  79         else:
  80             # output source files
  81             r = ''
  82             for source_file in js['source_filenames']:
  83                 r += render_js(js, source_file)
  84             return r
  85
  86 #@register.tag
  87 def compressed_css(parser, token):
  88     try:
  89         tag_name, name = token.split_contents()
  90     except ValueError:
  91         raise template.TemplateSyntaxError, '%r requires exactly one argument: the name of a group in the COMPRESS_CSS setting' % token.split_contents()[0]
  92
  93     return CompressedCSSNode(name)
  94 compressed_css = register.tag(compressed_css)
  95
  96 #@register.tag
  97 def compressed_js(parser, token):
  98     try:
  99         tag_name, name = token.split_contents()
 100     except ValueError:
 101         raise template.TemplateSyntaxError, '%r requires exactly one argument: the name of a group in the COMPRESS_JS setting' % token.split_contents()[0]
 102
 103     return CompressedJSNode(name)
 104 compressed_js = register.tag(compressed_js)