bgneal@646: """
bgneal@646: topic_export.py
bgneal@646: 
bgneal@646: A management command to export a forum topic by rendering it through a given
bgneal@646: template.
bgneal@646: 
bgneal@646: """
bgneal@646: from optparse import make_option
bgneal@646: import re
bgneal@646: 
bgneal@646: from django.core.management.base import LabelCommand, CommandError
bgneal@646: from django.template.loader import render_to_string, TemplateDoesNotExist
bgneal@646: 
bgneal@646: from forums.models import Topic
bgneal@646: 
bgneal@646: 
bgneal@646: SRC_RE = re.compile(r'src="/media/')
bgneal@646: SRC_REPL = 'src="http://surfguitar101.com/media/'
bgneal@646: 
bgneal@646: 
bgneal@646: class Command(LabelCommand):
bgneal@646:     help = "Exports a forum topic thread by rendering it through a given template"
bgneal@646:     option_list = LabelCommand.option_list + (
bgneal@646:             make_option('-t', '--template',
bgneal@646:                         default='forums/topic_export.html',
bgneal@646:                         help='template to render'),
bgneal@646:             make_option('-o', '--output',
bgneal@646:                         default=None,
bgneal@646:                         help='output filename [default: stdout]'),
bgneal@646:             )
bgneal@646: 
bgneal@646:     def handle_label(self, tid, **opts):
bgneal@646:         """Fetch the topic and related posts. Render through a template.
bgneal@646:         Optionally write content to an output file.
bgneal@646: 
bgneal@646:         """
bgneal@646:         try:
bgneal@646:             tid = int(tid)
bgneal@646:         except ValueError:
bgneal@646:             raise CommandError('topic ID must be an integer')
bgneal@646: 
bgneal@646:         template_name = opts['template']
bgneal@646:         output_filename = opts['output']
bgneal@646: 
bgneal@646:         try:
bgneal@646:             topic = Topic.objects.get(pk=tid)
bgneal@646:         except Topic.DoesNotExist:
bgneal@646:             raise CommandError('topic ID does not exist')
bgneal@646: 
bgneal@646:         posts = topic.posts.select_related(depth=1)
bgneal@646: 
bgneal@646:         try:
bgneal@646:             content = render_to_string(template_name, {'topic': topic, 'posts':
bgneal@646:                 posts})
bgneal@646:         except TemplateDoesNotExist:
bgneal@646:             raise CommandError('template does not exist')
bgneal@646: 
bgneal@646:         # fix up smiley images
bgneal@646:         content = SRC_RE.sub(SRC_REPL, content)
bgneal@646: 
bgneal@646:         content = content.encode('utf-8')
bgneal@646: 
bgneal@646:         if output_filename:
bgneal@646:             with open(output_filename, 'w') as fp:
bgneal@646:                 fp.write(content)
bgneal@646:         else:
bgneal@646:             self.stdout.write(content)