Export texte de la vue comparée

Un peu crado, mais je pense virer cette feature plus tard, au profit d'une
template de mail.

costs/templates/costs/document_compare.txt

@@ -0,0 +1,2 @@
+{% load costs %}{% for service_record in deltas.services %}
+- {{ service_record.service.name }} : {{ service_record.service.get_prices.unit_consolidated_cost|price }}{% if service_record.other_service %}{% with service_record.deltas.unit_consolidated_cost as consolidated_price_diff %}{% if consolidated_price_diff != 0 %} ({{ service_record.deltas.unit_consolidated_cost|price_diff }}){% endif %}{% endwith %}{% endif %}{% endfor %}

costs/views.py

@@ -1,10 +1,22 @@
 from django.contrib.auth.decorators import login_required
 from django.core.urlresolvers import reverse
+from django.http import HttpResponseBadRequest
 from django.shortcuts import render, get_object_or_404
 
 from .models import Document, Service, ServiceUse, CostUse, GoodUse
 
 
+CONTENT_TYPES = {
+    'html': 'text/html; charset=utf-8',
+    'txt': 'text/plain; charset=utf-8',
+}
+
+def format_to_content_type(_format):
+    if _format not in ('txt', 'html'):
+        raise ValueError('Unknown format {}'.format(_format))
+    else:
+        return '{}; charset=utf-8'.format(CONTENT_TYPES[_format])
+
 @login_required
 def list_documents(request):
     breadcrumbs = (
@@ -42,6 +54,11 @@ def detail_document(request, pk):
 
 @login_required
 def compare_document(request, pk, other_pk):
+    _format = request.GET.get('format', 'html')
+
+    if _format not in ('html', 'txt'):
+        return HttpResponseBadRequest('Wrong format : {}'.format(_format))
+
     doc = Document.objects.get(pk=pk)
     other_doc = Document.objects.get(pk=other_pk)
 
@@ -57,7 +74,13 @@ def compare_document(request, pk, other_pk):
         'other_documents': Document.objects.exclude(pk=doc.pk),
         'deltas': doc.compare(other_doc),
     }
-    return render(request, 'costs/document_compare.html', context)
+    response = render(
+        request,
+        'costs/document_compare.{}'.format(_format),
+        context,
+        content_type=format_to_content_type(_format),
+    )
+    return response
 
 
 @login_required