add work.formats()

core/models.py

@@ -1360,6 +1360,14 @@ class Work(models.Model):
     def pdffiles(self):
         return EbookFile.objects.filter(edition__work=self, format='pdf').exclude(file='').order_by('-created')
 
+    def formats(self):
+        fmts=[]
+        for fmt in ['pdf', 'epub', 'mobi', 'html']:
+            for ebook in self.ebooks().filter(format=fmt):
+                fmts.append(fmt)
+                break
+        return fmts
+    
     def make_ebooks_from_ebfs(self, add_ask=True):
         # either the ebf has been uploaded or a created (perhaps an ask was added or mobi generated)
         if self.last_campaign().type != THANKS:  # just to make sure that ebf's can be unglued by mistake

frontend/templates/work.html

@@ -6,7 +6,7 @@
 {% load lib_acqs %}
 {% block title %}— 
     {% if work.is_free %}
-        {{ work.title }} is a Free eBook. {% if work.first_pdf %}[PDF]{% endif %}{% if work.first_epub %}[EPUB, MOBI]{% endif %}
+        {{ work.title }} is a Free eBook. {% for fmt in  work.formats %}[{{ fmt }}]{% endfor %}
     {% else %}
         Help us make  {{ work.title }} a Free eBook!
     {% endif %}{% ifequal action 'editions' %} – All Editions{% endifequal %}