FIX: Fix broken newlining in PDFs

Introduced by a change in Django 2.1 'HTML rendered by form widgets no longer includes a closing slash on void elements, e.g. <br>. This is incompatible within XHTML, although some widgets already used aspects of HTML5 such as boolean attributes.'

RIGS/rigboard.py

@@ -206,7 +206,6 @@ class EventPrint(generic.View):
         }
 
         rml = template.render(context)
-
         buffer = rml2pdf.parseString(rml)
         merger.append(PdfFileReader(buffer))
         buffer.close()

RIGS/templates/RIGS/event_print_page.xml

@@ -1,7 +1,6 @@
+{% load filters %}
 <setNextFrame name="main"/>
 <nextFrame/>
-
-
 <blockTable style="headLayout" colWidths="330,165">
 <tr>
     <td>
@@ -13,7 +12,7 @@
 
         <keepInFrame>
             <para style="style.event_description">
-            {{ object.description|default_if_none:""|linebreaksbr }}
+            {{ object.description|default_if_none:""|linebreaksxml }}
                 </para>
         </keepInFrame>
     </td>
@@ -75,9 +74,9 @@
                 {% if invoice %}
                     <keepInFrame>
                         {% if object.organisation.address %}
-                            <para style="specific_description">{{ object.organisation.address|default_if_none:""|linebreaksbr }}</para>
+                            <para style="specific_description">{{ object.organisation.address|default_if_none:""|linebreaksxml }}</para>
                         {% elif object.person.address %}
-                            <para style="specific_description">{{ object.person.address|default_if_none:""|linebreaksbr }}</para>
+                            <para style="specific_description">{{ object.person.address|default_if_none:""|linebreaksxml }}</para>
                         {% endif %}
                     </keepInFrame>
                 {% endif %}
@@ -109,7 +108,7 @@
             <h3>{{ object.venue.name }}</h3>
             {% if not invoice %}
             <keepInFrame>
-            <para style="specific_description">{{ object.venue.address|default_if_none:""|linebreaksbr }}</para>
+            <para style="specific_description">{{ object.venue.address|default_if_none:""|linebreaksxml }}</para>
             </keepInFrame>
             {% endif %}
         </td>
@@ -185,7 +184,7 @@
                 {% if item.description %}
                     </para>
                     <para style="item_description">
-                    <em>{{ item.description|linebreaksbr }}</em>
+                    <em>{{ item.description|linebreaksxml }}</em>
                     </para>
                     <para>
                 {% endif %}

RIGS/templatetags/filters.py

@@ -2,10 +2,24 @@ from django import template
 from django import forms
 from django.forms.forms import NON_FIELD_ERRORS
 from django.forms.utils import ErrorDict
+from django.utils.text import normalize_newlines
+from django.template.defaultfilters import stringfilter
+from django.utils.safestring import SafeData, mark_safe
+from django.utils.html import escape
 
 register = template.Library()
 
 
+@register.filter(is_safe=True, needs_autoescape=True)
+@stringfilter
+def linebreaksxml(value, autoescape=True):
+    autoescape = autoescape and not isinstance(value, SafeData)
+    value = normalize_newlines(value)
+    if autoescape:
+        value = escape(value)
+    return mark_safe(value.replace('\n', '<br />'))
+
+
 @register.filter
 def multiply(value, arg):
     return value * arg