Initial implementation of view_related. The related_docs() function

is still a work in progress.  I've been using
draft-ietf-dnsext-dnssec-protocol as a test case; related_docs()
returns the same 137 documents as the cgi code but some of the
relationships are different.  Right now, the skip argument is
ignored.
 - Legacy-Id: 246

ietf/idindex/urls.py

@@ -19,6 +19,8 @@ urlpatterns = patterns('',
      (r'^inddocs/(?P<filter>[^/]+)/$', views.inddocs),
      (r'^otherdocs/(?P<cat>[^/]+)/$', views.otherdocs),
      (r'^showdocs/(?P<cat>[^/]+)/((?P<sortby>[^/]+)/)?$', views.showdocs),
+     (r'^(?P<id>\d+)/view_related_docs/$', views.view_related_docs),
+     (r'^(?P<slug>[^/]+)/view_related_docs/$', views.view_related_docs),
      (r'^(?P<object_id>\d+)/$', 'django.views.generic.list_detail.object_detail', info_dict),
      (r'^(?P<slug>[^/]+)/$', 'django.views.generic.list_detail.object_detail', dict(info_dict, slug_field='filename')),
      (r'^all_id_txt.html$', views.all_id, { 'template_name': 'idindex/all_id_txt.html' }),

ietf/idindex/views.py

@@ -3,8 +3,8 @@ from django.views.generic.list_detail import object_list
 from django.db.models import Q
 from django.http import Http404
 from django.template import RequestContext, loader
-from django.shortcuts import render_to_response
-from ietf.idtracker.models import Acronym, IETFWG, InternetDraft
+from django.shortcuts import render_to_response, get_object_or_404
+from ietf.idtracker.models import Acronym, IETFWG, InternetDraft, Rfc
 from ietf.idindex.forms import IDIndexSearchForm
 from ietf.idindex.models import alphabet, orgs, orgs_dict
 from ietf.utils import orl, flattenl
@@ -150,3 +150,61 @@ def all_id(request, template_name):
 	object_list.append({'tracker': False, 'id': o})
     return render_to_response(template_name, {'object_list': object_list},
 		context_instance=RequestContext(request))
+
+def related_docs(startdoc):
+    related = []
+    processed = []
+
+    def handle(otherdoc,status,doc,skip=(0,0,0)):
+        new = (otherdoc, status, doc)
+    	if otherdoc in processed:
+	    print "skipping (%s,%s,%s) because otherdoc has been processed" % (new)
+	    return
+	#if new not in related:
+	if True: #otherdoc not in processed:
+	    related.append(new)
+	if otherdoc not in processed: # now simply redundant
+	    process(otherdoc,skip)
+
+    def process(doc, skip=(0,0,0)):
+	#XXX
+	skip = (0,0,0)
+	print "doc = %s skip = %s" % (doc,skip)
+	processed.append(doc)
+	if type(doc) == InternetDraft:
+	    if doc.replaced_by_id != 0 and not(skip[0]):
+		handle(doc.replaced_by, "that replaces", doc, (0,1,0))
+	    if not(skip[1]):
+		for replaces in doc.replaces_set.all():
+		    handle(replaces, "that was replaced by", doc, (1,0,0))
+	    if doc.rfc_number != 0 and not(skip[0]):
+		# should rfc be an FK in the model?
+		handle(Rfc.objects.get(rfc_number=doc.rfc_number), "which came from", doc, (1,0,0))
+	if type(doc) == Rfc:
+	    if not(skip[0]):
+		try:
+		    draft = InternetDraft.objects.get(rfc_number=doc.rfc_number)
+		    #handle(doc, "which came from", draft, backwards=True)
+		    handle(draft, "that was published as", doc, (0,0,1))
+		except InternetDraft.DoesNotExist:
+		    pass
+	    if not(skip[1]):
+		for obsoleted_by in doc.updated_or_obsoleted_by.all():
+		    handle(obsoleted_by.rfc, "that %s" % obsoleted_by.action.lower(), doc, (0,0,1))
+	    if not(skip[2]):
+		for obsoletes in doc.updates_or_obsoletes.all():
+		    handle(obsoletes.rfc_acted_on, "that was %s by" % obsoletes.action.lower().replace("tes", "ted"), doc, (0,1,0))
+
+    process(startdoc, (0,0,0))
+    return related
+
+def view_related_docs(request, **kwargs):
+    if kwargs.has_key('id'):
+	startdoc = get_object_or_404(InternetDraft, id_document_tag=kwargs['id'])
+    else:
+        startdoc = get_object_or_404(InternetDraft, filename=kwargs['slug'])
+    related = related_docs(startdoc)
+    context = {'related': related, 'numdocs': len(related)}
+    context.update(base_extra)
+    return render_to_response("idindex/view_related_docs.html", context,
+		context_instance=RequestContext(request))

ietf/templates/idindex/view_related_docs.html

@@ -0,0 +1,14 @@
+{% extends "idindex/base.html" %}
+
+{% block iddbcontent %}
+<table>
+<tr><td colspan="3"><h3>Total number of related documents found: {{ numdocs }}</h3></td></tr>
+{% for doc in related %}
+<tr bgcolor="#{% cycle efefff,dfdfff %}"><td colspan="3">{{ doc.0.filename }}, "{{ doc.0.title }}{% if doc.1 %},{% endif %}"
+{% if doc.1 %}
+{{ doc.1 }} {{ doc.2.filename }}, "{{ doc.2.title }}"
+{% endif %}
+</td></tr>
+{% endfor %}
+</table>
+{% endblock %}