Link in tags to tag timeline.

Currently, only tags in toots from Mastodon servers are relinked,
because they use a consistent and easy-to-support heuristic.

brutaldon/templates/main/toot_partial.html

@@ -1,5 +1,6 @@
 {% load humanize %}
 {% load sanitizer %}
+{% load taglinks %}
 
 <article class="media">
     <figure class="media-left">
@@ -32,7 +33,7 @@
                 </p>
             {% endif %}
             <div class="toot">
-                {{ toot.content | strip_html | safe }}
+                {{ toot.content |relink_toot | strip_html | safe }}
             </div>
 
             {% if toot.media_attachments %}

brutaldon/templatetags/taglinks.py

@@ -0,0 +1,25 @@
+from django import template
+from bs4 import BeautifulSoup
+from urllib import parse
+from django.urls import reverse
+
+register = template.Library()
+
+@register.filter
+def relink_tags(value):
+    '''Treat the text as html, and replace tag links with app-internal tag links
+
+    Currently, this only works for tags in toots coming from Mastodon servers,
+    not necessarily GNU Social, Pleroma, or other fediverse servers, because
+    it relies on the markup that Mastodon puts on tags.
+
+    FIXME: handle arbitrary tag lengths.
+    '''
+    soup = BeautifulSoup(value, 'html.parser')
+    for link in soup.find_all('a', class_='hashtag'):
+        link['href'] = reverse('tag', args=[link.span.string])
+    return str(soup)
+
+@register.filter
+def relink_toot(value):
+    return relink_tags(value)

requirements.txt

@@ -1,12 +1,15 @@
+beautifulsoup4==4.6.0
 bleach==2.1.3
 certifi==2017.11.5
 chardet==3.0.4
 decorator==4.1.2
 Django==2.0.4
 django-html-sanitizer==0.1.5
+django-markdownify==0.8.0
 django-widget-tweaks==1.4.2
 html5lib==1.0.1
 idna==2.6
+Markdown==2.6.11
 Mastodon.py==1.2.1
 python-dateutil==2.6.1
 pytz==2017.3