replace WeasyPrint with pandoc

apps/core/utils.py

@@ -1,11 +1,13 @@
+import os
+from tempfile import mkstemp
+
 from django.template.loader import get_template
 from django.template import Context
 from django.http import HttpResponse
 from django.core.urlresolvers import reverse
 from django.utils.six.moves.urllib.parse import urlparse
 
-from weasyprint import HTML
-
+import pypandoc
 
 def get_script_alias(request):
     return request.path[:-len(request.path_info)]
@@ -46,16 +48,33 @@ def get_internal_link(text, name, *args, **kwargs):
     return "<a href=\"%s\">%s</a>" % (url, text)
 
 
-def render_to_pdf(request, template_src, context_dict, filename):
+def render_to_format(request, template_src, context_dict, title, format):
+    # render the template to a html string
     template = get_template(template_src)
     context = Context(context_dict)
     html = template.render(context).encode(encoding="UTF-8")
 
-    filename = filename + '.pdf'
+    # create a temporary file
+    (tmp_fd, tmp_filename) = mkstemp('.' + format)
+
+    # convert the file using pandoc
+    pypandoc.convert_text(html, format, format='html', outputfile=tmp_filename)
 
-    pdf_file = HTML(string=html, base_url=request.build_absolute_uri(), encoding="utf8").write_pdf()
+    # read the temporary file
+    file_handler = os.fdopen(tmp_fd)
+    file_content = file_handler.read()
+    file_handler.close()
 
-    response = HttpResponse(pdf_file, content_type='application/pdf')
-    response['Content-Disposition'] = filename
+    # delete the temporary file
+    os.remove(tmp_filename)
 
+    # create the response object and return
+    response = HttpResponse(file_content, content_type='application/%s' % format)
+    response['Content-Disposition'] = 'attachment; filename="%s.%s"' % (title, format)
     return response
+
+def render_to_pdf(request, template_src, context_dict, title):
+    return render_to_format(request, template_src, context_dict, title, 'pdf')
+
+def render_to_docx(request, template_src, context_dict, title):
+    return render_to_format(request, template_src, context_dict, title, 'docx')

apps/projects/templates/projects/project_summary.html

@@ -13,8 +13,23 @@ <h2>{% trans 'Options' %}</h2>
 
     <ul class="list-unstyled">
         <li>
-            <a href="{% url 'project_summary_pdf' project.pk %}" target="_blank">
-                {% trans 'Export PDF' %}
+            <a href="{% url 'project_summary_export' project.pk 'pdf' %}" target="_blank">
+                {% trans 'Export as PDF' %}
+            </a>
+        </li>
+        <li>
+            <a href="{% url 'project_summary_export' project.pk 'docx' %}" target="_blank">
+                {% trans 'Export as docx (Microsoft Office)' %}
+            </a>
+        </li>
+        <li>
+            <a href="{% url 'project_summary_export' project.pk 'docx' %}" target="_blank">
+                {% trans 'Export as odf (Open/Libre Office)' %}
+            </a>
+        </li>
+        <li>
+            <a href="{% url 'project_summary_export' project.pk 'tex' %}" target="_blank">
+                {% trans 'Export as LaTex source code' %}
             </a>
         </li>
     </ul>

apps/projects/urls.py

@@ -12,7 +12,7 @@
     url(_(r'^(?P<pk>[0-9]+)/delete/$'), ProjectDeleteView.as_view(), name='project_delete'),
 
     url(_(r'^(?P<pk>[0-9]+)/summary/$'), project_summary, name='project_summary'),
-    url(_(r'^(?P<pk>[0-9]+)/summary/pdf/$'), project_summary_pdf, name='project_summary_pdf'),
+    url(_(r'^(?P<pk>[0-9]+)/summary/(?P<format>[a-z]+)/$'), project_summary_export, name='project_summary_export'),
 
     url(_(r'^(?P<project_id>[0-9]+)/questions/'), project_questions, name='project_questions'),
 ]

apps/projects/views.py

@@ -10,7 +10,7 @@
 from rest_framework.status import HTTP_404_NOT_FOUND
 
 from apps.core.views import ProtectedCreateView, ProtectedUpdateView, ProtectedDeleteView
-from apps.core.utils import render_to_pdf
+from apps.core.utils import render_to_format
 
 from .models import Project
 from .serializers import *
@@ -39,12 +39,12 @@ def project_summary(request, pk):
 
 
 @login_required()
-def project_summary_pdf(request, pk):
+def project_summary_export(request, pk, format):
     project = get_object_or_404(Project.objects.filter(owner=request.user), pk=pk)
 
-    return render_to_pdf(request, 'projects/project_summary_pdf.html', {
+    return render_to_format(request, 'projects/project_summary_pdf.html', {
         'project': project
-    }, project.title)
+    }, project.title, format)
 
 
 class ProjectCreateView(ProtectedCreateView):

requirements/base.txt

@@ -8,5 +8,4 @@ django-compressor>=2.0
 django-libsass>=0.4
 jsonfield>=1.0.0
 django-bower>=5.1.0
-CairoSVG==1.0.22
-WeasyPrint>=0.29
+pypandoc